What's the simplest way to repair the Q100H?

[cwah]

Hello,

My Q100H doesn't work anymore. I bought it a year ago from BMSBattery:
https://bmsbattery.com/ebike-kit/630-q100h-36v350w-front-driving-ebike-hub-motor-ebike-kit.html

It's the 260RPM model at 36V laced on a 26" wheel.

Last year if I remember correctly the controller was displaying error... I can't remember which one and I don't have the controller anymore (so I need a new one).

What's the best way to fix it? I'd like not to spend more than 10 hours fixing it. If more than 10 hours it may be easier for me to buy a new motor and swap it somehow? Except that it would be really annoying to re-lace the motor.

Any help?

Thanks

 

[trex]

what's wrong with it? can you test the gearbox (turn wheel forward then backward) first?

 

[cwah]

I'm not sure what's wrong, I tested it initially with a controller and it was displayed some errors but can't remember what.


I tried to spin it 2 ways as I'm not sure which way is forward or backward. On 1 way it's spinning very well so good freewheel, but on the other way it's hard to spin and barely moves. Does it mean anything?

 

[trex]

that means gearbox is probably OK. Fault may be in Hall sensors.
You need to test the halls with a multitester:
https://www.ebikes.ca/documents/HallSensorTestingFinal.pdf

if they are OK. try the motor with a working controller to identify the fault.

 

[cwah]

I'm thinking to maybe get a sensorless controller? I don't want to cut the wire (it's very small wires for testing) in order to do all these test.

It has these new waterproof connectors:

Is there any way I can buy one of these controller without massive shipping cost?
https://bmsbattery.com/controller/698-sine-wave-controller-for-09-case-controller.html

Or maybe simplest is to buy this sensorless controller?
http://www.ebay.co.uk/itm/Brushless-Controller-For-E-bike-Scooter-with-without-Hall-Sensor-36V-48V-350W-/221888346035?hash=item33a99377b3:g:rpYAAOSwQPlV-i4Z

 

[trex]

you could ask andy @Woosh to lend you a 9-pin break out cable for your motor to test the motor. You can use a sensorless controller to test the motor but there are issues. Firstly, you can't plug a 9-pin male motor cable into a 3-pin female motor cable (controller side), the pins don't match. Secondly, the controller is programmed for the particular motor that is intended to pair with, another motor will spin up but will sound harsh.

 

[cwah]

you could ask andy @Woosh to lend you a 9-pin break out cable for your motor to test the motor. You can use a sensorless controller to test the motor but there are issues. Firstly, you can't plug a 9-pin male motor cable into a 3-pin female motor cable (controller side), the pins don't match. Secondly, the controller is programmed for the particular motor that is intended to pair with, another motor will spin up but will sound harsh.

Yes good point. I'm not sure I can really ask Woosh for that.

And this motor may just be my spare motor... so if I can have a quick but reliable fix that should be ok. It wouldn't be my main bike. This motor is the one I kept in france and when I come back every few months I like to be able to ride a bike.

So if it's a bit more noisy but reliable that's ok

 

[cwah]

I bought a sensorless controller:
http://www.ebay.co.uk/itm/221888346035?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT

Plugged it to the motor and it does work... however it makes a very awkward sound on start... like a little issue either with the clutch or gears.

I'd like not to damage my motor over time so I'm thinking to use a sensored controller finally....

I have now at home a 3 jaw puller:
http://www.ebay.co.uk/itm/3-JAW-PULLER-200MM-/321694182579?hash=item4ae677acb3:g:878AAOSwstxVAc3l

can i use it to open the motor once the screws have been removed? or does it have a specific mechanism to open the motor?

 

[KirstinS]

Cwah, are you over volting the motor ?

Just with my bpm (which can handle serious overvolting) I quickly discovered halls didn't for some reason and kept failing.

I ended up just running sensorless which noisier......but very controller dependent

Panda bikes controller was gentler on start up but not the quietest when cruising

I. have a generic controller now but it is fairly brutal upon start-up

 

[cwah]

which controller do you recommend kristin? My cheap one seems to make some rattling sound so I'm a bit cautious about that. But if it works fine without damaging gears and clutch I'm happy to run it as isd

 

[Deleted member 4366]

Q100 will turn with a sensorless controller, but runs too rough to be useable like that.

If it turns sensorless, then there must be something wrong with the hall sensors or the cable. That's assuming that the sensored controller was OK. Did you try another sensored controller and cable? If it's the cable tgat comes out of the motor or the hall sensors that's damaged, repair is tricky.

The easiest way to repair it is to buy another bare motor and swap the cores.

To take them apart, remove one of the three screws. Replace it with a slightly longer cap screw (allen screw) or normal hex head bolt. You need to put a washer under the head to cover the countersunk hole and to protect the motor. Do up the bolt tight. Use a hot air gun to heat up the hub between the spokes until it's just about too hot to touch, then use a large hammer and drift to knock the screw round the axle in an anti-clockwise directon. The join is near the spoke flange. Draw a pencil line across it so that you can see when it starts to turn. When it's moved about an inch, you can unscrew the rest by hand.