Bafang MOTOR CHOICE-- What is going on with the Codes/rpm

[gzmann]

Hello
I am new to this "sport/hobby"

I am wanting to buy a BAFANG BPM 48V500W REAR DRIVING E-BIKE HUB MOTOR

I am planning to get it from BMSBATTERY

I do not know which hub/motor to get????

I want to have a middle of the row bike - with good hillclimbing ability ,yet the desire to go 25mph or 40km/h on the flats (which seems reasonable to me ).

Which hub should I get -- the 201rpm version or the 328rpm version OR the 36v500w version with 201 rpm (and overvolt it)

HAS ANYONE BOUGHT A MOTOR FROM THEM RECENTLY??
if so --- what was ordered, and what CODE did you get??

I just want to make sure I get a CODE 10 or 11 motor AND i order the right kit!!!

Thanks for your help!

(moderator edit: merged your three duplicate threads into your original one. Please do not create multiple threads for the same thing. Please be patient and wait for people to see your question and reply to it. )

 

[gzmann]

hello error

 

[gzmann]

(moderator edit: merged your three duplicate threads into your original one. Please do not create multiple threads for the same thing. Please be patient and wait for people to see your question and reply to it. )

 

[amberwolf]

See the threads in this search:
http://www.endless-sphere.com/forums/search.php?keywords=%22BMSBATTERY%22+&terms=all&author=&sc=1&sf=titleonly&sk=t&sd=d&sr=topics&st=0&ch=300&t=0&submit=Search
and this one:
http://www.endless-sphere.com/forums/search.php?keywords=%22BMS+BATTERY%22+&terms=all&author=&sc=1&sf=titleonly&sk=t&sd=d&sr=topics&st=0&ch=300&t=0&submit=Search
for some info on that company and results of purchases/etc.

There are a lot more posts about it, but those are threads specifically about stuff from that company.

 

[emiyata]

Hello
I am new to this "sport/hobby"

I am wanting to buy a BAFANG BPM 48V500W REAR DRIVING E-BIKE HUB MOTOR

I am planning to get it from BMSBATTERY

I do not know which hub/motor to get????

I want to have a middle of the row bike - with good hillclimbing ability ,yet the desire to go 25mph or 40km/h on the flats (which seems reasonable to me ).

Which hub should I get -- the 201rpm version or the 328rpm version OR the 36v500w version with 201 rpm (and overvolt it)

HAS ANYONE BOUGHT A MOTOR FROM THEM RECENTLY??
if so --- what was ordered, and what CODE did you get??

I just want to make sure I get a CODE 10 or 11 motor AND i order the right kit!!!

Thanks for your help!

(moderator edit: merged your three duplicate threads into your original one. Please do not create multiple threads for the same thing. Please be patient and wait for people to see your question and reply to it. )

I have the 393 rpm motor and on a 24" wheel it tops out at 30 mph and high speed motor 328 rpm should give you 25 mph on a 24" wheel with better climbing ability. if you are using a 26" wheel add another 3 mph to your speed but that would lower your climbing ability some. Mine is 48v 500 watt 393 rpm. I hope this helps.

 

[gzmann]

I guess what I wanted to know was --- what was the motor you ordered and what code did you get????

It seems to be all over the map, and everyone seems to get a different code motor even tho they ordered the same motor????

I just want get a code 10 or 11. ---- but what do I need to order to get that???

 

[amberwolf]

If you read the threads in that search, you'll find that if you order from that company, it doesnt' really matter what you order, because you may well get something else. Maybe you'll get what you ordered, maybe you won't.

 

[emiyata]

I guess what I wanted to know was --- what was the motor you ordered and what code did you get????

It seems to be all over the map, and everyone seems to get a different code motor even tho they ordered the same motor????

I just want get a code 10 or 11. ---- but what do I need to order to get that???

They don't sell by CODE they sell by RPM.

If you try to buy using code numbers not RPM you may get the wrong motor. Use the size of the wheel and the rpm and do the math and you will know the top speed. Then select the RPM motor on the site and the other parts needed or just order the kit. When you order your charger order the charger that matches your line voltage and battery type. If you select the wrong voltage you will get the wrong supply. They are order takers for the most part and probably don't even see the product they are selling. Double check your order and you should be fine. Remember they are in China and sell things cheap and shipping is costly so make sure your order is correct. If you want support order from a good dealer in your country but they charge more money for the product so you can get the support you need.

 

[gzmann]

I was hoping to find out if anyone has ordered a motor recently.

what was the motor they got and what was the Code of it???

there are people who in the past who ordered a motor, and according to rpm and the motors they get are the wrong code

most people who have written about the codes, wrote about it a while ago and there seems to be no relevance now??

I am trying to take the guess work out of this --- I was going to order 2 kits, so I dont want to get the wrong code motors.

 

[jlust286]

I just received my Bafang 48v500w 201RPM rear motor kit a couple days ago from BMS battery. It took about 45 days to get it. The motor is black and engraved on the motor it says BPM 48v500w 26(16)

 

[d8veh]

I'm pretty sure that they supply the code 10 for 48v 328rpm. At 36v, they've supplied both Code 13 and Code 15 for 201 rpm. The code 15 will give about 24mph max at 48v. If you buy from Greenbikekit.com, they're much better with their communication and should be able too tell you exactly what you'll get. Their shipping is a bit cheaper too. They probably won't understand code numbers, so just ask them for details of what's written on the motor, and give them an example like "48v500w 26(16)"

 

[gzmann]

Thanks for all the input

I will order the 48v500w 328rpm --- which i believe is the code 10 motor.

Which code motor one gets is important.

All speed calculations are based on the code of the motor. If one gets an unexpected code, the purpose/function of changing the windings for different purposes , it is problematic. I do not want to get a higher volt battery just so i can go 45km/h. I want to use the batteries that i already have.

 

[gzmann]

Just to make it all even more confusing, I got this in an email

Please see below code for the BPM motor:
36V500W 216RPM: Code 12
36V500W 216RPM: Code 10
36V500W 312RPM: Code 10
48V500W 216RPM: Code 16
48V500W 312RPM: Code 12
36V350W 216RPM: Code 12
48V350W 216RPM: Code 15

I asked them if there was an error in the 36v500w motors - being/having the same code?? the reply was there was no error???

So according to this list , I would get the Code 12 -- NOT the code 10 as initially thought??

So what to do??? perhaps they have no idea what they are doing there????

 

[emiyata]

Thanks for all the input

I will order the 48v800w 328rpm --- which i believe is the code 10 motor.

Which code motor one gets is important.

All speed calculations are based on the code of the motor. If one gets an unexpected code, the purpose/function of changing the windings for different purposes , it is problematic. I do not want to get a higher volt battery just so i can go 45km/h. I want to use the batteries that i already have.

800w? is this a typo for 500w?

 

[gzmann]

Yas, that was a typo

NOW even more telling!!!

The latest email from bmsbattery

" Thanks for your inquiry , the motor is randomly sent out , i am not sure we could send you code 10 motors ."

Oh --- so it is true -- you really do not know what you will get!!!! WHAT A FARCE!!!! BEWARE

 

[d8veh]

Just to make it all even more confusing, I got this in an email

Please see below code for the BPM motor:
36V500W 216RPM: Code 12
36V500W 216RPM: Code 10
36V500W 312RPM: Code 10
48V500W 216RPM: Code 16
48V500W 312RPM: Code 12
36V350W 216RPM: Code 12
48V350W 216RPM: Code 15

I asked them if there was an error in the 36v500w motors - being/having the same code?? the reply was there was no error???

So according to this list , I would get the Code 12 -- NOT the code 10 as initially thought??

So what to do??? perhaps they have no idea what they are doing there????

That list looks totally wrong based on my personal experience.

 

[emiyata]

Yas, that was a typo

NOW even more telling!!!

The latest email from bmsbattery

" Thanks for your inquiry , the motor is randomly sent out , i am not sure we could send you code 10 motors ."

Oh --- so it is true -- you really do not know what you will get!!!! WHAT A FARCE!!!! BEWARE

Order at your own risk. I received what I ordered. It all worked. The motor has no sticker. My guess is even if it had a sticker or marking on it the code would be wrong. They go by RPM not Code.
The concept of emailing them is to get valuable information. Asking a technical question(s) to someone that is just an order taker that don't know your language has no value.
Here is another example: left and right brake switch . Is this a translation thing? Will it blink? If you send the email asking that question they will say , yes! You get it in and find out it don't work. You email them and say it don't work. They will say oh I am so sorry and you can send it back. They know you will not send it back. Your email has no value.
If you buy from someone local they handle all this type of stuff for a price but if you want to buy a motor cheap you can order one from them.

 

[dnmun]

retailmenot is offering free shipping if you have to return something purchased with paypal.

 

[d8veh]

retailmenot is offering free shipping if you have to return something purchased with paypal.

Can you explain a bit more. The only thing I can find for Retailmenot is coupons to get discounts at local stores.

 

[friendly1uk]

Why would someone try and specify a motor using data they don't understand. Even a design engineer is not going to understand these motor codes. It is not a known spec, it is just used internally by bafang. You can try to decode it if you like, but as yet there is nothing conclusive. It is perhaps a coil measurement system they have in place, other than actually counting the turns. The only truth is that it is meaningless to us. It is not a spec you use to define motor characteristics.

Volts, Amps, Watts, Torque, RPM, Pole Count, Turns, These are all normal terms. There are a number more, but non are code. Code is not how to specify a motor. It does not separate one from another. I think there sat at the factory thinking just what people here are saying. "They don't know what they are doing"

Who do you really think has it right. The people making them, Or could it be us, who don't even claim to understand it. One thing is for sure, We don't, so we should not question if they do.

All we need do is tell them our voltage, the wattage we intend, and the rpm we require. If you want to go further, You want the graphs that show motor torque to calculate how far through the revs you might get under load.

Nobody is about to tell me why we need code, or what code is. Forget about it. Tell bafang you want rpm on the label if your not happy. That is the traditional approach.


This post (I have made) makes me feel sad. It is a shame people can come so far, only to be misguided by all this code talk that nobody even understands. We have a perfectly good international weights and measurements system to say exactly what we need. Don't accept anything else.

 

[gzmann]

I agree with you this whole CODE thing is a waste of time ( As far as I gather, "CODE" is merely their word for "TURN" )

I have inquired with BMSBATTERY about getting a motor with a certain rpm -- there answer is "OK but we can not tell you that is the motor you are getting"
SO
I decided to go with their game and use Codes --- again they say " we can not tell you that is the motor you will get"

SO BOTTOM line


I ordered from greenbikekit and they said they will give me a CODE 10 motor == which is a 10TURN motor that matches the 10T motor i have from MAC

DONE with BmSbattery

 

[floatingdog]

I have a code 13 36v 350W I bought years ago from BMS Battery. It does 18 mph on 36v Bosch Fat Packs (41V fully charged). Good luck on your purchase and keep us posted. I've really enjoyed mine. It is very quiet and starts smoothly despite being sensorless.

 

[d8veh]

I have a code 13 36v 350W I bought years ago from BMS Battery. It does 18 mph on 36v Bosch Fat Packs (41V fully charged). Good luck on your purchase and keep us posted. I've really enjoyed mine. It is very quiet and starts smoothly despite being sensorless.

Just in case you don't know, you can boost the speed a bit by using the three-speed switch as long as you have the connector on your controller. You don't need a switch, instead just join the middle pin to each of the outers in turn with a piece of wire to see which side is high speed and which is low. You should get about 20% extra speed.

 

[chas58]

+1 on that

I'm not sure why they (GBK) give you different motor codes for the same watt-volt motor, but they tend to have better advice than BMS. I got my package in the US less than a week after ordering (shipped DHL). And, they are more efficient with their packing and will put more stuff in the box without charging you extra (example: you can ship two front wheels for the price of one).

I agree with you this whole CODE thing is a waste of time ( As far as I gather, "CODE" is merely their word for "TURN" )

I have inquired with BMSBATTERY about getting a motor with a certain rpm -- there answer is "OK but we can not tell you that is the motor you are getting"
SO
I decided to go with their game and use Codes --- again they say " we can not tell you that is the motor you will get"

SO BOTTOM line


I ordered from greenbikekit and they said they will give me a CODE 10 motor == which is a 10TURN motor that matches the 10T motor i have from MAC

DONE with BmSbattery

 

[d8veh]

+1 on that

I'm not sure why they (GBK) give you different motor codes for the same watt-volt motor, but they tend to have better advice than BMS. I got my package in the US less than a week after ordering (shipped DHL). And, they are more efficient with their packing and will put more stuff in the box without charging you extra (example: you can ship two front wheels for the price of one).

I agree with you this whole CODE thing is a waste of time ( As far as I gather, "CODE" is merely their word for "TURN" )

I have inquired with BMSBATTERY about getting a motor with a certain rpm -- there answer is "OK but we can not tell you that is the motor you are getting"
SO
I decided to go with their game and use Codes --- again they say " we can not tell you that is the motor you will get"

SO BOTTOM line


I ordered from greenbikekit and they said they will give me a CODE 10 motor == which is a 10TURN motor that matches the 10T motor i have from MAC

DONE with BmSbattery

GBK seem to be much more customer-focused than BMSB. Neither of them stock the stuff. They call the stuff in from distributors and outside workshops. It wouldn't surprise me if they don't even see the stuff that you order. I guess GBK are more willing to ring up their suppliers to see what they've got.

Bafang know exactly what they mean with the Code designations. They are an exact specification. The code number AFAWK relates directly to the number of turns per pole, and hence you can calculate/compare motor speeds. Unfortunately, there's lots of interpretations of the translation between code numbers and motor speeds because people are so willing to publish their results.

Lets take a Code 15 at 36v. This table shows it's RPM as 206 at 36v:
http://endless-sphere.com/forums/viewtopic.php?f=2&t=43106
but your battery spends most of its time around 40v, which means actual RPM will be 228 rpm. Then some controllers have three-speed switches, where the high position can boost the speed somehow, so does that mean that the 228rpm is boosted, or is the middle position less than 228rpm? These things tend to muddy the results when individuals post their own experience of speeds.