Bafang RM.G062.1000W Geared hub RPM much too fast......

pullin-gs · Feb 20, 2021

I ordered a 26" version with RPM 380 RPM @48V rating.....but received motor with 500+RPM measured @ 48V.
Measured speed (unloaded) is 39 MPH with 26" wheel. I expect I was sent 20" motor version. :-(

My original plan was to overvolt 380RPM motor to 56V......maybe instead I will not overvolt and just add more AH capacity to offset added current draw?
Controller is rated maximum 48 amps.

Has anyone had any luck lacing up a BAFANG 20"-rated motor to a 26" rim? Or is it likely I will smoke the motor's windings?

motomech · Feb 20, 2021

Did you make the measurements yourself?
Something doesn't seem right. The only speed range rating I see for the G60 (500W, 750W and 1000W, fat nor normal) is 8.2 RPM/Volt, which is around 400 RPM @ 48V. The Grin product lit. also lists the G60 500W as 8.2, although strangely enough, their motor sim shows it @ 300 RPM @ 48V.
If we assume the 400RPM @ 48V rating is correct and plug-in a motor likewise rated (MAC 6T) onto their motor sim, we get these results (26" whl.);
36 V = 27 MPH
48 V = 29.5 MPH
Still a plenty fast motor.

My original plan was to overvolt 380RPM motor to 56V......maybe instead I will not overvolt and just add more AH capacity to offset added current draw?
Controller is rated maximum 48 amps.

Not sure what you mean about the "added current draw", but it seems to me a 50 AMP controller is too much for a 4.2 Kg geared motor.

I will smoke the motor's windings?

My experience w/ running high-speed motors @ less than optimal speeds (climbing hills) is it's not the motor windings that melt, but it's first the the phase wire connectors, then the phase wires themselves. Of course once the phase wires fuse the motor wires/windings can be damaged.

I think you need to do more research, does the G60 really come in more than one speed range??
Or maybe talk to Grin even if you didn't buy the motor from them. Tell them you would have bought it from them, but they are out of stock :wink: .

pullin-gs · Feb 20, 2021

This is a Bafang G062.....not the rebadged Grin G60. Different beast entirely with very little information available.
Indeed something is not right with this motor.
Vendor lists RPM at zero load as 380-RPM.
400RPM would work.....but 500 is too fast.
FYI I measured over 500RPM @48V under zero load with my tach.
Connectors and motor wires on G062 are on the narrow side IMO....heavier than G060, but no by very much.

pullin-gs · Feb 24, 2021

Solution may be drop to 12S6P (instead of planned 14S5P) battery....power across RPM/Load range acceptable. 50Amps (max controller) may be a bit much for phase wires of power cable? Performance modeling looks promising.

TuomasK · Feb 25, 2021

I have G062.1000.DC. Running with 60v battery (16s) and 40A controller. Tops ~40mph.
I have venter both sides of motor for cooling and IR temp measurement.
Bike is Rad Rhino (/Rover).
Measured kv 8.8 rpm/volt. Motor labeled G062.1000.DC (6). This (6) is related to winding version. No load speed 49.6 mph @ 65.7V ( 579rpm)

TuomasK · Feb 25, 2021

motomech said:
Did you make the measurements yourself?
Something doesn't seem right. The only speed range rating I see for the G60 (500W, 750W and 1000W, fat nor normal) is 8.2 RPM/Volt, which is around 400 RPM @ 48V. The Grin product lit. also lists the G60 500W as 8.2, although strangely enough, their motor sim shows it @ 300 RPM @ 48V.
If we assume the 400RPM @ 48V rating is correct and plug-in a motor likewise rated (MAC 6T) onto their motor sim, we get these results (26" whl.);
36 V = 27 MPH
48 V = 29.5 MPH
Still a plenty fast motor.

My original plan was to overvolt 380RPM motor to 56V......maybe instead I will not overvolt and just add more AH capacity to offset added current draw?
Controller is rated maximum 48 amps.

Click to expand...

Not sure what you mean about the "added current draw", but it seems to me a 50 AMP controller is too much for a 4.2 Kg geared motor.

I will smoke the motor's windings?

Click to expand...

My experience w/ running high-speed motors @ less than optimal speeds (climbing hills) is it's not the motor windings that melt, but it's first the the phase wire connectors, then the phase wires themselves. Of course once the phase wires fuse the motor wires/windings can be damaged.

I think you need to do more research, does the G60 really come in more than one speed range??
Or maybe talk to Grin even if you didn't buy the motor from them. Tell them you would have bought it from them, but they are out of stock :wink: .

Regarding to G060 and KV versions. Yes they do come in more that two versions. The model number stamped on casing has last number (6 to 10 to my knowledge) between brackets (winding indication). Smaller is faster.

pullin-gs · Mar 3, 2021

TuomasK said:
I have G062.1000.DC. Running with 60v battery (16s) and 40A controller. Tops ~40mph.
I have venter both sides of motor for cooling and IR temp measurement.
Bike is Rad Rhino (/Rover).
Measured kv 8.8 rpm/volt. Motor labeled G062.1000.DC (6). This (6) is related to winding version. No load speed 49.6 mph @ 65.7V ( 579rpm)

What controller are you using? You must be pushing close to 2000Watts!

TuomasK · Mar 4, 2021

pullin-gs said:
TuomasK said:

I have G062.1000.DC. Running with 60v battery (16s) and 40A controller. Tops ~40mph.
I have venter both sides of motor for cooling and IR temp measurement.
Bike is Rad Rhino (/Rover).
Measured kv 8.8 rpm/volt. Motor labeled G062.1000.DC (6). This (6) is related to winding version. No load speed 49.6 mph @ 65.7V ( 579rpm)

Click to expand...

What controller are you using? You must be pushing close to 2000Watts!

2600 Max at the moment. New custom 3000w sine wave controller is just ready to be tested. New 16s6p Samsung 40t 150A BMS battery is under construction.

marci · May 20, 2021

gmm, i´m really interested in G062.1000.DC too.

Actually I used a g060.750.DC (6) 20" 175mm Version on my Surly Wednesday and this is for my purposes to fast and not strong enough for my hills on country side.

I´l never seen a G062.1000.DC with slower windings, so I think about to buy a g060.750.DC again, but with lower RPM. Have anyone a clue, where I can get a G060.750 seriously with slow windings?

btw. see this picture: you can see here on Photo G62 in Version 6 (20" Version)
https://german.alibaba.com/product-detail/ebike-motor-bafang-48v-1000w-electric-bike-rear-hub-motor-bafang-48v-1000w-geared-motor-for-fat-electric-bicycle-62511921813.html?spm=a2700.7724857.normal_offer.d_image.ebdd23e5v4pys0

TuomasK · Jun 30, 2021

TuomasK said:
pullin-gs said:

TuomasK said:

I have G062.1000.DC. Running with 60v battery (16s) and 40A controller. Tops ~40mph.
I have venter both sides of motor for cooling and IR temp measurement.
Bike is Rad Rhino (/Rover).
Measured kv 8.8 rpm/volt. Motor labeled G062.1000.DC (6). This (6) is related to winding version. No load speed 49.6 mph @ 65.7V ( 579rpm)

Click to expand...

What controller are you using? You must be pushing close to 2000Watts!

Click to expand...

2600 Max at the moment. New custom 3000w sine wave controller is just ready to be tested. New 16s6p Samsung 40t 150A BMS battery is under construction.

With new battery battery and controller the performance has increased. Topspeed is 42 mph and 0-25mph just over 3 sec.

Dan Rogers · Apr 9, 2022

I am trying to find a bafang g062 6turn motor . I 'll try contacting the above link . I need it in 190mm old .

Bafang RM.G062.1000W Geared hub RPM much too fast......

pullin-gs

1 kW

motomech

10 MW

pullin-gs

1 kW

pullin-gs

1 kW

TuomasK

1 W

TuomasK

1 W

pullin-gs

1 kW

TuomasK

1 W

marci

10 mW

TuomasK

1 W

Dan Rogers

1 µW

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