FULL THROTTLE

[TONYLYONS]

36v. system, Motor only operates at full throttle.
Anything less than full throttle, the motor quits.
New throttle and batteries.
On hills the motor stutters and quits.
On the level bike cruises at 9-12mph for many miles.
MOSFETS check out okay.

Any ideas as to what may be causing the motor to quit at less than full throttle?
What might cause the motor to grunt, stutter and quit at heavy loads?

Thank you
Tony

 

[DAND214]

Welcome to Es.

Before you get the Royal Welcome, Please fill in your Profile as to where you are located so we can better assist you.

Onto the question,
Is this a new biuld?
If so have you made sure that the throttle is in the correct connector and or all plgs fully connected.

Dan

 

[TONYLYONS]

Unit is a 5 year old tricycle that was running great until recently.
Attempts to correct the problem included replacing the throttle- no improvement.
Install new batteries- no improvement.

Problem started about two months ago when the motor suddenly quit, then restarted during a long ride.
The motor quits at random times, then restarts.

The motor is a hub style with 14T directly attached sprocket that is chained to a 14T freewheel sprocket on the rear axle.
Motor drive is parallel to the pedal drive.
Maximum motor speed is 200 RPM with wheel jacked up.
Prior to problem the motor could be throttled to assist pedaling, even at low speeds.
Now it is full speed or nothing. The trike is to heavy to pedal on any grade without the motor assist.

Tony
Lafayette, CA

 

[d8veh]

Is it a brushed or brushless motor. If brushed, look at the brushes, which may be worn out.

 

[dogman dan]

Good call, that old it could easily be a brushed, and that's sounding like brushes that only work if the power is high. That's typical for brushes gone bad.

The other possibility is the same old problem, something in the wiring acting the same way. But a weak connection on a wire tends to work the opposite, it works, but only x amount of power gets to the motor.

 

[TONYLYONS]

The motor is brushless

Tony

 

[amberwolf]

It's possible a bad ground in the throttle wiring could do that. A corroded or backed out pin in the connector on the controller side of the throttle wiring could remain the problem even with a new throttle (and it's own connector). Could also be wire broken inside the cabling, or at the pcb inside the controller.