Advise sort on a my new Bird

[saneagle]

I just found out from reading a chaps add on GT that the Bird Bafang Rear hub is actually a 500W motor that is restricted I assume with the Bird controller which is good news so I probably keep it on the bike.

That makes me now wonder if the new 4 Bafang Rear hub motors I have in stock from the Somerby Pendalton old bike but new unused motors are also in fact 500W but also factory marked as 250W does any one know if this is the case ?

If you look at the windings inside the motor where they're terminated, you'll see that the wires are bundled in parallel. Let's say that there are 120 loops of wire around each pole. That could be 5 turns of a bundle of 24, 6 turns of a bundle of 20, 8 of 15 10 of 12, 12 of 10 or 15 of 8. Whichever it has, the windings would look identical, but the motor would have completely different speed and power characteristics. They also use slightly different thickness of wire to give even more combinations.

Bafang motors used to have the number of turns written on the outside of the motor, appearing as a number in brackets ranging from 6 to 16, with 16 being very slow and 6 being very fast.

 

[Baz the balloon man]

OK amI right in saying that the RM number CO10250D 15 1 under thatF6V2040933 are the number you mean so 15 1 at the end is the speed ?

I assume as it’s Bafang it’s a very good quality motor are they ok to go up to 48 V for a bit more torque?

 

[Baz the balloon man]

Worth the effort to put into a different rim ? But then the rim looks sound to me I might just have to spray black to match the front on a Raleigh Array or buy a silver front rim.
Or spray chrome effect on the front wheel not sure how that would look

I had an interesting few e mails with a guy in the States he said The Hunan Wisdom Company make the original OM Bird Batteries and any other company selling them in China should be avoided problem as they pack in after around six months is they have an MOQ of 50 pieces so he is sending me a few defunct ones so I can get the battery guy to do a quality re cell here.

So I think to keep the Bird Bafang if it gets a new lease of bird life

 

[Baz the balloon man]

In my limited experience checking the motor drawings of Bafang hubs shows that the 500W and 250W motors have different dimensions. The 250/350W tend to be identical. You would of course have to know the model numbers to check this.

Just posted photos on Saneagle thread have a look see what you think

 

[Baz the balloon man]

Just posted photos on Saneagle thread have a look see what you think

On this thread

 

[saneagle]

OK amI right in saying that the RM number CO10250D 15 1 under thatF6V2040933 are the number you mean so 15 1 at the end is the speed ?

I assume as it’s Bafang it’s a very good quality motor are they ok to go up to 48 V for a bit more torque?

The number 15 indicates the number of turns on each pole. 15 is quite a slow one, so good for 48v.

https://bafang-e.com/fileadmin/Images/support/588359deb88c5cc9520e979df8f6dbe6-1.pdf

 

[Baz the balloon man]

Just checked my Bird the Bafang is 250 number 10
RM G020. 250.D 10

SO A FASTER MOTOR

 

[Baz the balloon man]

Just had contact from the original manufacturer of Bird Bike Batteries Hunan Wisdom Company .

They say both 9.6 AH and larger spec batteries use the same Canbus System so should be compatible with bikes sold in the UK

Problem is they have or did have before Tariffs a MOQ of 50 pieces according to from a contact in the USA.

If any one looking for a replacment original battery get in touch .