Breakers come instantaneous or inverse time and the % of fla you should choose is based on which.
On Thu, May 27, 2021 at 4:06 PM, john via groups.io <oak_box@...> wrote:
It would still be really nice to have a breaker right at the battery to protect in the event of a short somewhere along the line.
Looks like Amazon has 48V breakers up to 300A.? I saw a fuse for 500A or 600A, but they're only rated to 32V.??
John
On Thursday, May 27, 2021, 03:43:31 PM CDT, Dan Pfeiffer <dan@...> wrote:
Very useful info.? Thanks.?
Does a controller (like the Sevcon4) handle current limiting to the motor??? It does have thermal overload control which is related.? Would the "overleads" device you describe between the controller and motor (sounds like a circuit breaker) be redundant if the controller can do the same thing? ??
Dan Pfeiffer
?
On 2021-05-27 1:56 pm, Dave Yamakuchi via groups.io wrote:
?
NEC generally calls for 175% of Full Load Ampere rating for dual element time delay fuses for motors.? Fast acting fuses, inverse time or instantaneous breakers are all rated differently for the short circuit protection.
?
However, this only covers short circuit protection, and not an overload condition. Thermal or electronic 'overloads' located after the control circuit directly before the wires to the motor is the generally accepted practice for protecting against an overloaded motor. Fishing line or seaweed maybe binding the shaft and preventing it from spinning freely, for instance.? Or prop stuck in the mud.? This is in addition to the fuses.? Depending on the motor's service factor and temperature rise specs, the overloads usually shut off at no more than 115% or 125% of the FLA.
?
Overloads have a much tighter current limit range, but they're somewhat slower acting to allow for inrush at startup. (fuses and breakers often vary widely in the actual trip current)? They're meant to recreate the motor's windings' temperature to trip the control circuit.? Also, they're resettable.
?
See Article 430 of the NEC for more info.
?
On Thursday, May 27, 2021, 12:39:03 PM CDT, Dan Pfeiffer <dan@...> wrote:
?
?
For those running 48V 8-20kW systems, what are you doing for fuse protection on your battery bank?? Brands and sizes??? My 12kW motor has a constant capacity of 250 amps.? The peak capacity is 600.? I don't know what I might actually see for short duration peaks but I was thinking a 300 amp fuse might blow in normal operating if I had a momentary peak on the motor draw.?? What are others using??
Dan Pfeiffer
?
|
The SEVCON GEN4 controller can limit the battery current and in any case limits the motor current.
?
You can take a look at the fuse integrated in the controller:
- 48V size 2 - 275A max motor - 250A fuse (x 48V = 12 kW)
- 48V size 4 - 450A max motor - Fuse 425A (x 48V = 20 kW)
- 48V size 6 - 650A max motor - 750A fuse (x 48V = 36 kW)
?
An additional fuse on the battery bank protects against short circuits in the wiring.
Thierry LEQUEU
|
I use a class T-fuse at the battery, the primary criterion was ability to safely and effectively interrupt a potentially massive short circuit from the LiFePo bank.? There's a notional rating for fuse capacity (trip current) which you've referenced, but there's another rating which is the absolutely maximum that the fuse can safely and effectively interrupt.? This rating is tied to the physical design and construction of the fuse/CB.?
If a short circuit exceeds this interrupting capacity, the current could arc over the device and/or other catastrophic failure modes.? Please note that the interrupting capacity drastically changes on whether the current is AC or DC, so check that on the datasheet.? AC can self extinguish on polarity reversal, this can't happen with DC.
This is largely an issue for Lithium chemistries, I don't believe that (most?) LA batteries are physically capable of generating the very intense short circuit currents which is necessary to overcome the interrupting capacity.
?
Kai
|
I use a class T-fuse at the battery, the primary criterion was
ability to safely and effectively interrupt a potentially massive
short circuit from the LiFePo bank.? There's a notional rating for
fuse capacity (trip current) which you've referenced, but there's
another rating which is the absolutely maximum that the fuse can
safely and effectively interrupt.? This rating is tied to the
physical design and construction of the fuse/CB.?
If a short circuit exceeds this interrupting capacity, the
current could arc over the device and/or other catastrophic
failure modes.? Please note that the interrupting capacity
drastically changes on whether the current is AC or DC, so check
that on the datasheet.? AC can self extinguish on polarity
reversal, this can't happen with DC.
This is largely an issue for Lithium chemistries, I don't believe
that (most?) LA batteries are physically capable of generating the
very intense short circuit currents which is necessary to overcome
the interrupting capacity.
Kai
On 28/5/21 7:00 am, john via groups.io
wrote:
toggle quoted message
Show quoted text
It would still be really nice
to have a breaker right at the battery to protect in the event
of a short somewhere along the line.
Looks like Amazon has 48V
breakers up to 300A.? I saw a fuse for 500A or 600A, but
they're only rated to 32V.??
John
On Thursday, May 27, 2021, 03:43:31 PM CDT, Dan Pfeiffer
<dan@...> wrote:
Very useful info.? Thanks.?
Does a controller (like the Sevcon4) handle current
limiting to the motor??? It does have thermal overload
control which is related.? Would the "overleads"
device you describe between the controller and motor
(sounds like a circuit breaker) be redundant if the
controller can do the same thing? ??
Dan Pfeiffer
?
On
2021-05-27 1:56 pm, Dave Yamakuchi via groups.io
wrote:
?
NEC generally calls for 175% of
Full Load Ampere rating for dual element time
delay fuses for motors.? Fast acting fuses,
inverse time or instantaneous breakers are all
rated differently for the short circuit
protection.
?
However, this only covers short
circuit protection, and not an overload
condition. Thermal or electronic 'overloads'
located after the control circuit directly
before the wires to the motor is the generally
accepted practice for protecting against an
overloaded motor. Fishing line or seaweed
maybe binding the shaft and preventing it from
spinning freely, for instance.? Or prop stuck
in the mud.? This is in addition to the
fuses.? Depending on the motor's service
factor and temperature rise specs, the
overloads usually shut off at no more than
115% or 125% of the FLA.
?
Overloads have a much tighter
current limit range, but they're somewhat
slower acting to allow for inrush at startup.
(fuses and breakers often vary widely in the
actual trip current)? They're meant to
recreate the motor's windings' temperature to
trip the control circuit.? Also, they're
resettable.
?
See Article 430 of the NEC for
more info.
?
On Thursday, May 27, 2021, 12:39:03 PM
CDT, Dan Pfeiffer <dan@...>
wrote: ?
?
For those running 48V 8-20kW systems,
what are you doing for fuse protection
on your battery bank?? Brands and
sizes??? My 12kW motor has a constant
capacity of 250 amps.? The peak capacity
is 600.? I don't know what I might
actually see for short duration peaks
but I was thinking a 300 amp fuse might
blow in normal operating if I had a
momentary peak on the motor draw.?? What
are others using??
Dan Pfeiffer
?
|
If they have "thermal overload protection," then yes, that's probably the protection, in addition to the fuses, that you want.? The overload 'setting' (electronic ols are 'set', thermal elements are fixed/chosen) needs to correspond to your motor's FLA (x1.15 or x1.25 _max_, depending on sf & temp).
IDK the sevcon, but IIRC, this was a decent intro to basic motor starters.? I'm guessing your device is probably more a vfd than a simple contactor, but you still want the ocp and overloads.
https://youtu.be/aml0VGzNXEo
On Thu, May 27, 2021 at 3:43 PM, Dan Pfeiffer <dan@...> wrote:
Very useful info.? Thanks.?
Does a controller (like the Sevcon4) handle current limiting to the motor??? It does have thermal overload control which is related.? Would the "overleads" device you describe between the controller and motor (sounds like a circuit breaker) be redundant if the controller can do the same thing? ??
Dan Pfeiffer
?
On 2021-05-27 1:56 pm, Dave Yamakuchi via groups.io wrote:
?
NEC generally calls for 175% of Full Load Ampere rating for dual element time delay fuses for motors.? Fast acting fuses, inverse time or instantaneous breakers are all rated differently for the short circuit protection.
?
However, this only covers short circuit protection, and not an overload condition. Thermal or electronic 'overloads' located after the control circuit directly before the wires to the motor is the generally accepted practice for protecting against an overloaded motor. Fishing line or seaweed maybe binding the shaft and preventing it from spinning freely, for instance.? Or prop stuck in the mud.? This is in addition to the fuses.? Depending on the motor's service factor and temperature rise specs, the overloads usually shut off at no more than 115% or 125% of the FLA.
?
Overloads have a much tighter current limit range, but they're somewhat slower acting to allow for inrush at startup. (fuses and breakers often vary widely in the actual trip current)? They're meant to recreate the motor's windings' temperature to trip the control circuit.? Also, they're resettable.
?
See Article 430 of the NEC for more info.
?
On Thursday, May 27, 2021, 12:39:03 PM CDT, Dan Pfeiffer <dan@...> wrote:
?
?
For those running 48V 8-20kW systems, what are you doing for fuse protection on your battery bank?? Brands and sizes??? My 12kW motor has a constant capacity of 250 amps.? The peak capacity is 600.? I don't know what I might actually see for short duration peaks but I was thinking a 300 amp fuse might blow in normal operating if I had a momentary peak on the motor draw.?? What are others using??
Dan Pfeiffer
?
|
I was not concerned with protecting the battery, I was concerned with protecting the wiring and not causing a fire in the case of a short in the large battery wiring while at the same time allowing for the occasional current spikes that might occur in normal operation.??? Are those current spikes limited by the controller programming??
Your micro controller system sounds intriguing.? It seems like an extension of the controller.? Will the Sevcon try it's best up to some per-programmed limit? Say the 600 amp max capacity of the motor?? Is that something the Sevcon is capable of being programmed for?? Acceleration curves can be programmed into the controller.? Is that the controller not responding as demanded by the throttle input?? If you slam the throttle the controller will ramp up at the programmed acceleration rate, not necessarily as fast as you commanded it to.?? But if the load on the motor changes is that a different scenario.?? Do acceleration curves still apply??
Will your emergency override also potentially sacrifice the controller to overload?? And then your in the same position as if you had lost the battery??? How much would the primary wiring be oversized to keep it from being the weak link in an emergency override??? Do monitors like the Vicrtron have programmable settings for high current alarms??
Dan Pfeiffer
?
toggle quoted message
Show quoted text
On 2021-05-28 7:24 am, Randy Cain wrote:
Dan, your Sevcon will normally try its best to make the motor turn as it's commanded so it could indeed cause an overload of the discharge C-rating and potentially damage the cells. I wouldn't try to protect them with a fuse because it could fail right when you need it. Consider increasing the available C-rating (big cells, paralleled cells or higher C-rated cells). Alternatively (but more complex) would be an active current monitor (shunt + microcontroller) that would monitor battery current and (first) sound an alarm and then (second) disconnect the contactor before damage could occur. This approach would allow an emergency override so the you could sacrifice your batteries to save the boat if the situation demanded it. I'm following this approach in my build using ESP32-based microcontrollers.
|
Dan, your Sevcon will normally try its best to make the motor turn as it's commanded so it could indeed cause an overload of the discharge C-rating and potentially damage the cells. I wouldn't try to protect them with a fuse because it could fail right when you need it. Consider increasing the available C-rating (big cells, paralleled cells or higher C-rated cells). Alternatively (but more complex) would be an active current monitor (shunt + microcontroller) that would monitor battery current and (first) sound an alarm and then (second) disconnect the contactor before damage could occur. This approach would allow an emergency override so the you could sacrifice your batteries to save the boat if the situation demanded it. I'm following this approach in my build using ESP32-based microcontrollers.
|
I bought my fuses from from ev-west. Thunderstruck didn’t carry them at high voltages. (I’m at 600 Amps at 154V.)
Basically, I looked at the fuses from car EV conversions. They aren’t cheap and they’re big. But finding a variety is no issue.?
Great info on this thread!!! ?Thanks everyone.?
toggle quoted message
Show quoted text
It would still be really nice to have a breaker right at the battery to protect in the event of a short somewhere along the line.
Looks like Amazon has 48V breakers up to 300A.? I saw a fuse for 500A or 600A, but they're only rated to 32V.??
John
On Thursday, May 27, 2021, 03:43:31 PM CDT, Dan Pfeiffer < dan@...> wrote:
Very useful info.? Thanks.?
Does a controller (like the Sevcon4) handle current limiting to the motor??? It does have thermal overload control which is related.? Would the "overleads" device you describe between the controller and motor (sounds like a circuit breaker) be redundant if the controller can do the same thing? ??
Dan Pfeiffer
?
On 2021-05-27 1:56 pm, Dave Yamakuchi via groups.io wrote:
?
NEC generally calls for 175% of Full Load Ampere rating for dual element time delay fuses for motors.? Fast acting fuses, inverse time or instantaneous breakers are all rated differently for the short circuit protection.
?
However, this only covers short circuit protection, and not an overload condition. Thermal or electronic 'overloads' located after the control circuit directly before the wires to the motor is the generally accepted practice for protecting against an overloaded motor. Fishing line or seaweed maybe binding the shaft and preventing it from spinning freely, for instance.? Or prop stuck in the mud.? This is in addition to the fuses.? Depending on the motor's service factor and temperature rise specs, the overloads usually shut off at no more than 115% or 125% of the FLA.
?
Overloads have a much tighter current limit range, but they're somewhat slower acting to allow for inrush at startup. (fuses and breakers often vary widely in the actual trip current)? They're meant to recreate the motor's windings' temperature to trip the control circuit.? Also, they're resettable.
?
See Article 430 of the NEC for more info.
?
On Thursday, May 27, 2021, 12:39:03 PM CDT, Dan Pfeiffer < dan@...> wrote: ?
?
For those running 48V 8-20kW systems, what are you doing for fuse protection on your battery bank?? Brands and sizes??? My 12kW motor has a constant capacity of 250 amps.? The peak capacity is 600.? I don't know what I might actually see for short duration peaks but I was thinking a 300 amp fuse might blow in normal operating if I had a momentary peak on the motor draw.?? What are others using??
Dan Pfeiffer
?
|
It would still be really nice to have a breaker right at the battery to protect in the event of a short somewhere along the line.
Looks like Amazon has 48V breakers up to 300A.? I saw a fuse for 500A or 600A, but they're only rated to 32V.??
John
On Thursday, May 27, 2021, 03:43:31 PM CDT, Dan Pfeiffer <dan@...> wrote:
Very useful info.? Thanks.?
Does a controller (like the Sevcon4) handle current limiting to the motor??? It does have thermal overload control which is related.? Would the "overleads" device you describe between the controller and motor (sounds like a circuit breaker) be redundant if the controller can do the same thing? ??
Dan Pfeiffer
?
On 2021-05-27 1:56 pm, Dave Yamakuchi via groups.io wrote:
?
NEC generally calls for 175% of Full Load Ampere rating for dual element time delay fuses for motors.? Fast acting fuses, inverse time or instantaneous breakers are all rated differently for the short circuit protection.
?
However, this only covers short circuit protection, and not an overload condition. Thermal or electronic 'overloads' located after the control circuit directly before the wires to the motor is the generally accepted practice for protecting against an overloaded motor. Fishing line or seaweed maybe binding the shaft and preventing it from spinning freely, for instance.? Or prop stuck in the mud.? This is in addition to the fuses.? Depending on the motor's service factor and temperature rise specs, the overloads usually shut off at no more than 115% or 125% of the FLA.
?
Overloads have a much tighter current limit range, but they're somewhat slower acting to allow for inrush at startup. (fuses and breakers often vary widely in the actual trip current)? They're meant to recreate the motor's windings' temperature to trip the control circuit.? Also, they're resettable.
?
See Article 430 of the NEC for more info.
?
On Thursday, May 27, 2021, 12:39:03 PM CDT, Dan Pfeiffer <dan@...> wrote:
?
?
For those running 48V 8-20kW systems, what are you doing for fuse protection on your battery bank?? Brands and sizes??? My 12kW motor has a constant capacity of 250 amps.? The peak capacity is 600.? I don't know what I might actually see for short duration peaks but I was thinking a 300 amp fuse might blow in normal operating if I had a momentary peak on the motor draw.?? What are others using??
Dan Pfeiffer
?
|
Very useful info.? Thanks.?
Does a controller (like the Sevcon4) handle current limiting to the motor??? It does have thermal overload control which is related.? Would the "overleads" device you describe between the controller and motor (sounds like a circuit breaker) be redundant if the controller can do the same thing? ??
Dan Pfeiffer
?
toggle quoted message
Show quoted text
On 2021-05-27 1:56 pm, Dave Yamakuchi via groups.io wrote:
?
NEC generally calls for 175% of Full Load Ampere rating for dual element time delay fuses for motors.? Fast acting fuses, inverse time or instantaneous breakers are all rated differently for the short circuit protection.
?
However, this only covers short circuit protection, and not an overload condition. Thermal or electronic 'overloads' located after the control circuit directly before the wires to the motor is the generally accepted practice for protecting against an overloaded motor. Fishing line or seaweed maybe binding the shaft and preventing it from spinning freely, for instance.? Or prop stuck in the mud.? This is in addition to the fuses.? Depending on the motor's service factor and temperature rise specs, the overloads usually shut off at no more than 115% or 125% of the FLA.
?
Overloads have a much tighter current limit range, but they're somewhat slower acting to allow for inrush at startup. (fuses and breakers often vary widely in the actual trip current)? They're meant to recreate the motor's windings' temperature to trip the control circuit.? Also, they're resettable.
?
See Article 430 of the NEC for more info.
?
On Thursday, May 27, 2021, 12:39:03 PM CDT, Dan Pfeiffer <dan@...> wrote:
?
?
For those running 48V 8-20kW systems, what are you doing for fuse protection on your battery bank?? Brands and sizes??? My 12kW motor has a constant capacity of 250 amps.? The peak capacity is 600.? I don't know what I might actually see for short duration peaks but I was thinking a 300 amp fuse might blow in normal operating if I had a momentary peak on the motor draw.?? What are others using??
Dan Pfeiffer
?
|
NEC generally calls for 175% of Full Load Ampere rating for dual element time delay fuses for motors.? Fast acting fuses, inverse time or instantaneous breakers are all rated differently for the short circuit protection.
However, this only covers short circuit protection, and not an overload condition. Thermal or electronic 'overloads' located after the control circuit directly before the wires to the motor is the generally accepted practice for protecting against an overloaded motor. Fishing line or seaweed maybe binding the shaft and preventing it from spinning freely, for instance.? Or prop stuck in the mud.? This is in addition to the fuses.? Depending on the motor's service factor and temperature rise specs, the overloads usually shut off at no more than 115% or 125% of the FLA.
Overloads have a much tighter current limit range, but they're somewhat slower acting to allow for inrush at startup. (fuses and breakers often vary widely in the actual trip current)? They're meant to recreate the motor's windings' temperature to trip the control circuit.? Also, they're resettable.
See Article 430 of the NEC for more info.
On Thursday, May 27, 2021, 12:39:03 PM CDT, Dan Pfeiffer <dan@...> wrote:
For those running 48V 8-20kW systems, what are you doing for fuse protection on your battery bank?? Brands and sizes??? My 12kW motor has a constant capacity of 250 amps.? The peak capacity is 600.? I don't know what I might actually see for short duration peaks but I was thinking a 300 amp fuse might blow in normal operating if I had a momentary peak on the motor draw.?? What are others using??
Dan Pfeiffer
|
For those running 48V 8-20kW systems, what are you doing for fuse protection on your battery bank?? Brands and sizes??? My 12kW motor has a constant capacity of 250 amps.? The peak capacity is 600.? I don't know what I might actually see for short duration peaks but I was thinking a 300 amp fuse might blow in normal operating if I had a momentary peak on the motor draw.?? What are others using?? Dan Pfeiffer
|
Re: What kind of fitting is this?
Hello Ryan
Can you share the name or link to this ev motor, if they have a 20 spline 7/8 ' shaft that could suit my sail drive if I can find the correct coupling.
Cheers Tim Downes?
On Thu, May 27, 2021 at 12:40 AM Ryan Sweet < ryan@...> wrote: Hello,
I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I’ve not seen this before nor can I figure out what it is called.
Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?
Thanks,
-Ryan
|
Re: What kind of fitting is this?
You'll use a splined shaft when the shaft has to move axially. (Look at your wheel hub shafts in your car.)
That means, Ryan, than you will have to fix the spline to fix the movement. Can be done by making a locking pin hole through the motor shaft and the spline shaft. Again, you'll need a machinist to do the job.
On Thursday, 27 May 2021, 09:36:31 GMT+8, Jeffrey Griglack via groups.io <griglack@...> wrote:
A fitting like this is commonly used in electric golf carts.? I have a (approx.) 3 hp motor and spline from an old golf cart sitting in my home office someplace.
On Wednesday, May 26, 2021, 9:07:43 PM EDT, Carsten via groups.io <carstensemail@...> wrote:
Ryan, you'll need a machinist to turn this shaft into a diameter that fits the toothbelt pulley, and a key slot, made for same.
Or ask the manufacturer of the motor if they have any straightforward recommendations for you.
Carsten
On Thursday, 27 May 2021, 01:12:28 GMT+8, Ryan Sweet <ryan@...> wrote:
Argh accidentally hit send instead of paste - something like this - ideally with a toothed belt pulley instead of smooth.... any thoughts on the best sources for that?
On May 26, 2021, at 10:10, Ryan Sweet <ryan@...> wrote:
?
enter gearsomutions.com for helping me get educated.?
So it looks like I would need something like this...?
On May 26, 2021, at 09:57, Ryan Sweet via groups.io <ryan@...> wrote:
?
Thank you! That was what I needed to learn more.?
Any recommendation for a reference work that can fill these occasional gaps in my understanding of mechanical connections? On May 26, 2021, at 09:49, Dan Pfeiffer <dan@...> wrote:
?
Its a spline.?? Very common on transmission shafts.?? Allows for a slip fit and very high torque capacity.??
?
On 2021-05-26 11:40 am, Ryan Sweet wrote:
Hello,
I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I’ve not seen this before nor can I figure out what it is called.
Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?
Thanks,
-Ryan
|
Re: What kind of fitting is this?
A fitting like this is commonly used in electric golf carts.? I have a (approx.) 3 hp motor and spline from an old golf cart sitting in my home office someplace.
On Wednesday, May 26, 2021, 9:07:43 PM EDT, Carsten via groups.io <carstensemail@...> wrote:
Ryan, you'll need a machinist to turn this shaft into a diameter that fits the toothbelt pulley, and a key slot, made for same.
Or ask the manufacturer of the motor if they have any straightforward recommendations for you.
Carsten
On Thursday, 27 May 2021, 01:12:28 GMT+8, Ryan Sweet <ryan@...> wrote:
Argh accidentally hit send instead of paste - something like this - ideally with a toothed belt pulley instead of smooth.... any thoughts on the best sources for that?
On May 26, 2021, at 10:10, Ryan Sweet <ryan@...> wrote:
?
enter gearsomutions.com for helping me get educated.?
So it looks like I would need something like this...?
On May 26, 2021, at 09:57, Ryan Sweet via groups.io <ryan@...> wrote:
?
Thank you! That was what I needed to learn more.?
Any recommendation for a reference work that can fill these occasional gaps in my understanding of mechanical connections? On May 26, 2021, at 09:49, Dan Pfeiffer <dan@...> wrote:
?
Its a spline.?? Very common on transmission shafts.?? Allows for a slip fit and very high torque capacity.??
?
On 2021-05-26 11:40 am, Ryan Sweet wrote:
Hello,
I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I’ve not seen this before nor can I figure out what it is called.
Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?
Thanks,
-Ryan
|
Re: What kind of fitting is this?
Ryan, you'll need a machinist to turn this shaft into a diameter that fits the toothbelt pulley, and a key slot, made for same.
Or ask the manufacturer of the motor if they have any straightforward recommendations for you.
Carsten
On Thursday, 27 May 2021, 01:12:28 GMT+8, Ryan Sweet <ryan@...> wrote:
Argh accidentally hit send instead of paste - something like this - ideally with a toothed belt pulley instead of smooth.... any thoughts on the best sources for that?
On May 26, 2021, at 10:10, Ryan Sweet <ryan@...> wrote:
?
enter gearsomutions.com for helping me get educated.?
So it looks like I would need something like this...?
On May 26, 2021, at 09:57, Ryan Sweet via groups.io <ryan@...> wrote:
?
Thank you! That was what I needed to learn more.?
Any recommendation for a reference work that can fill these occasional gaps in my understanding of mechanical connections? On May 26, 2021, at 09:49, Dan Pfeiffer <dan@...> wrote:
?
Its a spline.?? Very common on transmission shafts.?? Allows for a slip fit and very high torque capacity.??
?
On 2021-05-26 11:40 am, Ryan Sweet wrote:
Hello,
I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I’ve not seen this before nor can I figure out what it is called.
Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?
Thanks,
-Ryan
|
Re: What kind of fitting is this?
And the de-facto drive connection on outboard motors… ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Ryan Sweet
Sent: Wednesday, May 26, 2021 9:57 AM
To: [email protected]
Subject: Re: [electricboats] What kind of fitting is this?? Thank you! That was what I needed to learn more.? Any recommendation for a reference work that can fill these occasional gaps in my understanding of mechanical connections?
On May 26, 2021, at 09:49, Dan Pfeiffer <dan@...> wrote:
? Its a spline.?? Very common on transmission shafts.?? Allows for a slip fit and very high torque capacity.??
On 2021-05-26 11:40 am, Ryan Sweet wrote: Hello,
I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I’ve not seen this before nor can I figure out what it is called.
Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?
Thanks,
-Ryan
|
Re: What kind of fitting is this?
I don't think that will work.? There is no way to secure the splines together.? The spline is free by design to slide in/out.? That motor was meant for a rigid mounting of some sort not for a pulley drive.?? It looks a lot like the input side of the V-drive transmission on my old diesel that mounted directly to the reverse gear on the motor. ? You would need some sort of housing that the motor and the pulley (mounted on it's own bearings) mount to.?
?
Dan Pfeiffer
toggle quoted message
Show quoted text
On 2021-05-26 12:12 pm, Ryan Sweet wrote:
Argh accidentally hit send instead of paste - something like this - ideally with a toothed belt pulley instead of smooth.... any thoughts on the best sources for that?
?
?
On May 26, 2021, at 10:10, Ryan Sweet <ryan@...> wrote:
enter gearsomutions.com for helping me get educated.?
?
So it looks like I would need something like this...?
?
On May 26, 2021, at 09:57, Ryan Sweet via groups.io <ryan@...> wrote:
Thank you! That was what I needed to learn more.?
?
Any recommendation for a reference work that can fill these occasional gaps in my understanding of mechanical connections?
On May 26, 2021, at 09:49, Dan Pfeiffer <dan@...> wrote:
Its a spline.?? Very common on transmission shafts.?? Allows for a slip fit and very high torque capacity.??
?
On 2021-05-26 11:40 am, Ryan Sweet wrote:
Hello,
I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I've not seen this before nor can I figure out what it is called.
Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?
Thanks,
-Ryan
|
Re: What kind of fitting is this?
Argh accidentally hit send instead of paste - something like this - ideally with a toothed belt pulley instead of smooth.... any thoughts on the best sources for that?
toggle quoted message
Show quoted text
On May 26, 2021, at 10:10, Ryan Sweet <ryan@...> wrote:
? enter gearsomutions.com for helping me get educated.?
So it looks like I would need something like this...?
On May 26, 2021, at 09:57, Ryan Sweet via groups.io <ryan@...> wrote:
? Thank you! That was what I needed to learn more.?
Any recommendation for a reference work that can fill these occasional gaps in my understanding of mechanical connections? On May 26, 2021, at 09:49, Dan Pfeiffer <dan@...> wrote:
?
Its a spline.?? Very common on transmission shafts.?? Allows for a slip fit and very high torque capacity.??
?
On 2021-05-26 11:40 am, Ryan Sweet wrote:
Hello,
I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I’ve not seen this before nor can I figure out what it is called.
Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?
Thanks,
-Ryan
|
Re: What kind of fitting is this?
enter gearsomutions.com for helping me get educated.?
So it looks like I would need something like this...?
toggle quoted message
Show quoted text
On May 26, 2021, at 09:57, Ryan Sweet via groups.io <ryan@...> wrote:
? Thank you! That was what I needed to learn more.?
Any recommendation for a reference work that can fill these occasional gaps in my understanding of mechanical connections? On May 26, 2021, at 09:49, Dan Pfeiffer <dan@...> wrote:
?
Its a spline.?? Very common on transmission shafts.?? Allows for a slip fit and very high torque capacity.??
?
On 2021-05-26 11:40 am, Ryan Sweet wrote:
Hello,
I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I’ve not seen this before nor can I figure out what it is called.
Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?
Thanks,
-Ryan
|
Randy Cain