Mac Motor bad out of the box?

[tmstacks]

I recently got a brand new MAC motor. I installed it on my bike, and instead of working properly, it makes a horrible screeching noise
and does not spin. I can coax it to spin by giving the tire a little resistance with my hand while the bike is on a stand. But when it goes
it sounds awful, has little power, and cuts out after a few seconds. It sounds sort of like rubber or plastic rubbing against something. But the tire, rim, and brakes aren't rubbing anything. It's definitely from the motor.

I've attached a link to a short video with a used motor with about 1000 miles on it working properly, and the brand new malfunctioning motor. Everything else is identical. Same bike, both motors recorded within minutes of each other.

What the heck is going on with this motor? It is brand new!

Thanks!

https://www.dropbox.com/s/g8amg5w5mr99p0y/Good%20Motor%20Bad%20Motor_x264.mp4?dl=0

 

[dogman dan]

Clutch is jacked up. might be just the shear key.

 

[teklektik]

I guess my first question is: Why are you posting here and not looking to the vendor for support for this new purchase?

Beyond that, from the video it seems that:

• there is no 'horrible screeching noise' - nothing mechanical sounding like mechanical rubbing or contact (imo),
• the motor did not turn when you applied power,
• in order to get the motor to run, you had to turn the motor backwards (different than 'giving resistance'), and
• we did not see it 'cut out after a few seconds' so don't know if it just refuses to re-start once allowed to stop, or stops while under power.

This has the indicators of a hall/phase mismatch and appears unrelated to the clutch. The clutch is at least marginally working since the video shows it silently freewheeling when the tire is turned forward, quietly engaging when turned backwards, and not seeming to make any noise when the motor is under power.

• The sound seems to be the phases fighting each other - not a mechanical 'screeching'.
• The failure of the motor to initiate motion from a dead stop looks like an incorrect hall/phase sequence. Possibly a disconnected hall, but the sound when running suggests against a simple disconnect.
• Pushing the wheel backwards engages the clutch and rotates the inner magnet bowl to a favorable hall position to get the wheel turning. Once turning the two 'good' hall phase setups overpower the one bad one so it continues to turn - but under protest (the sound you hear).

To proceed, you might:

• Verify you have no broken hall wires and that all connectors are fully seated.
• Verify the hall pins are in the connectors of the new and old motors in the same order.
• If you purchased the controller and motor from the same source - then contact them about the issue and proper hall/phase hookup.
• If you wired the halls and phases yourself, re-do the sequencing - it doesn't seem correct. See the many threads here on ES about that.
• Don't goose the motor to WOT - if the phase setup is wonky, heavy throttle may damage the controller.