RPM cutout

[odrapnew]

Ok, this is my first post and I did a lot of searching and found some results, but no smoking gun for my issue.

I have a Snow Joe 48v brushless single stage snowblower which had the controller burn out.

I bought a cheap controller and throttle from Amazon.

Its a 48v, 500w controller. Says 25A rating.

Amazon.com : doinal 48V 500W Brushless Motor Controller 25 Amp Speed Controller Square Wave Controller 9 Mosfet for Electric Bike Scooter (48V500W) : Sports & Outdoors

Amazon.com : doinal 48V 500W Brushless Motor Controller 25 Amp Speed Controller Square Wave Controller 9 Mosfet for Electric Bike Scooter (48V500W) : Sports & Outdoors

a.co

The setup works, but when the motor hits a certain rpm, it shuts off. I can immediately release throttle and push it again and it'll start. I'm at about 1/2 throttle.

It seems like always same rpm (by ear). If i slowly creap up on it, it gets just below that rpm and can hold that forever. If I give it a touch more throttle, rpm jump up and it shuts off.

Voltage is steady and even happens at 47v.
I checked current with amp clamp and see about 11A when it shuts off.

Any thoughts on this? I can add more details if needed.

 

[E-HP]

Ok, this is my first post and I did a lot of searching and found some results, but no smoking gun for my issue.

I have a Snow Joe 48v brushless single stage snowblower which had the controller burn out.

I bought a cheap controller and throttle from Amazon.

Its a 48v, 500w controller. Says 25A rating.

Amazon.com : doinal 48V 500W Brushless Motor Controller 25 Amp Speed Controller Square Wave Controller 9 Mosfet for Electric Bike Scooter (48V500W) : Sports & Outdoors

Amazon.com : doinal 48V 500W Brushless Motor Controller 25 Amp Speed Controller Square Wave Controller 9 Mosfet for Electric Bike Scooter (48V500W) : Sports & Outdoors

a.co

The setup works, but when the motor hits a certain rpm, it shuts off. I can immediately release throttle and push it again and it'll start. I'm at about 1/2 throttle.

It seems like always same rpm (by ear). If i slowly creap up on it, it gets just below that rpm and can hold that forever. If I give it a touch more throttle, rpm jump up and it shuts off.

Voltage is steady and even happens at 47v.
I checked current with amp clamp and see about 11A when it shuts off.

Any thoughts on this? I can add more details if needed.

The processor in the controller isn’t fast enough to operate at that high an rpm. This issue comes up even with some geared ebike hub motors where the motor internally is running several times the speed of the hub. You may be able to find info on suitable controllers using the forum search. Geared MAC motors are often mentioned, regarding the issue.

 

[odrapnew]

Thank you for the input.

I should have said that the motor is spinning fairly fast, at least by my "calibrated ears", and might be spinning fast enough to work, but I won't know until we get some snow and try it out.