RXV Whining Nose on Acceleration / Deceleration

[boudin]

Hi folks. My first post. I bought a refurb 2011 RXV and it has a whining noise on acceleration and deceleration. Full speed, petal to the metal about 20 mph and is quiet (except for tire/road noise). This is my first RXV so I'm not sure what is considered 'normal'.

The fact that it's quiet at full speed makes me think there is no bearing or gear issue.

I've been doing some reading on this forum and it seems like this is somewhere between 'normal' and a problem with the brake?

Any thoughts would be appreciated. Thanks.

-Greg

[BobBoyce]

Originally Posted by boudin

Hi folks. My first post. I bought a refurb 2011 RXV and it has a whining noise on acceleration and deceleration. Full speed, petal to the metal about 20 mph and is quiet (except for tire/road noise). This is my first RXV so I'm not sure what is considered 'normal'.

The fact that it's quiet at full speed makes me think there is no bearing or gear issue.

I've been doing some reading on this forum and it seems like this is somewhere between 'normal' and a problem with the brake?

Any thoughts would be appreciated. Thanks.

-Greg

A certain amount of whine is normal. The RXV is 3 phase AC drive, and the 3 phase AC waveforms are simulated with a high frequency switched 3 phase H-Bridge. DC carts can whine too, as the DC is rapidly switched by a PWM (Pulse Width Modulator) to control the average voltage/current to the motor. 3 Phase AC motors have 3 times the number of coils being driven by simulated waveforms, so they will whine more.