- #1
Guineafowl
- 791
- 383
- TL;DR Summary
- Someone has posted this fault on a woodworking forum I’m on. The motor makes a humming noise when electrically, but not mechanically driven.
Link to thread: https://www.ukworkshop.co.uk/threads/very-noisy-motor.125693/#post-1398215
The treadmill is powered by UK standard 1ph 240V AC. The motor is a 180V, permanent magnet, DC brushed type and speed control is by PWM. There is an audio file in the thread; to me, the pitch of the sound stays relatively constant, suggesting the excessive noise is related to the PWM signal.
OP has ruled out mechanical problems such as motor bearings, and the treadmill belt/roller system.
Changing the motor solved the problem, but only for six months. As far as I can see, this is either a pattern failure of motors of a similar age, or a problem with the driver board, perhaps inducing noise from distorted PWM. I’ve done my best with remote diagnosis, but would welcome opinions on this.
The treadmill is powered by UK standard 1ph 240V AC. The motor is a 180V, permanent magnet, DC brushed type and speed control is by PWM. There is an audio file in the thread; to me, the pitch of the sound stays relatively constant, suggesting the excessive noise is related to the PWM signal.
OP has ruled out mechanical problems such as motor bearings, and the treadmill belt/roller system.
Changing the motor solved the problem, but only for six months. As far as I can see, this is either a pattern failure of motors of a similar age, or a problem with the driver board, perhaps inducing noise from distorted PWM. I’ve done my best with remote diagnosis, but would welcome opinions on this.