Motor current dropping to zero and back up constantly

RidingWithGremlins · 03-19-2022, 04:32 PM

I have a 2004 Club Car DS. I've been having issues with shuddering during take off, and decided to check the batteries under load. So, I lifted the rear wheels off the ground and measured the voltage across the pack.

The voltage across the pack was fine, even under load. I noticed, however, that that the motor itself appeared to be rapidly turning itself on and off again, rather than providing a constant force. I hooked a handset up to the cart, and the armature and field current are both rapidly fluctuating between zero and a peak value, rather than providing a steady value. The same trend was visible for the PWM values for the armature and field. The throttle position, as measured by the computer, was steady throughout, so I don't think that's the issue.

Anyone have any ideas as to what might cause that?

sthreatt · 03-19-2022, 05:06 PM

Maybe worn motor brushes. Or a dead spot in the armature.

DaveMJ · 03-19-2022, 05:39 PM

Quote:

Originally Posted by sthreatt

Maybe worn motor brushes. Or a dead spot in the armature.

Agrred - just went through this on one of my carts.

03-19-2022, 04:32 PM	#1
RidingWithGremlins Not Yet Wild Join Date: Mar 2022 Posts: 6	Motor current dropping to zero and back up constantly I have a 2004 Club Car DS. I've been having issues with shuddering during take off, and decided to check the batteries under load. So, I lifted the rear wheels off the ground and measured the voltage across the pack. The voltage across the pack was fine, even under load. I noticed, however, that that the motor itself appeared to be rapidly turning itself on and off again, rather than providing a constant force. I hooked a handset up to the cart, and the armature and field current are both rapidly fluctuating between zero and a peak value, rather than providing a steady value. The same trend was visible for the PWM values for the armature and field. The throttle position, as measured by the computer, was steady throughout, so I don't think that's the issue. Anyone have any ideas as to what might cause that?

03-19-2022, 05:06 PM	#2
sthreatt Gone Wild Join Date: Jul 2015 Location: Central South Carolina Posts: 942	Re: Motor current dropping to zero and back up constantly Maybe worn motor brushes. Or a dead spot in the armature.

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