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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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02-28-2011, 11:18 AM | #61 |
Sooner Faithful
Join Date: May 2010
Location: Oklahoma
Posts: 268
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Re: EMP Motor squeal/squeak
I am curious if this is still happening.
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02-28-2011, 04:47 PM | #62 |
Gone Wild
Join Date: Feb 2010
Location: GA
Posts: 180
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Re: EMP Motor squeal/squeak
It is still happening, but it hasn't effected the performance of the motor. It still does it in speed mode but doesn't do it in torque mode. I guess I wouldn't hesitate to buy another one. I sure wish I knew what the cause was but I cant figure it out. I truly believe that there is something possibly mechanical slipping somewhere in the motor or the input pinion on its shaft spinning. I have never heard electrical noise like that. BUT, when I pulled the gear cover on the bottom of the cart and layed up under it while my wife was driving and recreating the problem I never see anything moving/slipping. If it ever tears or if I figure it out I will update this thread!! I might share the wealth with the next motor I buy and try out a Plum Quick. They are what I would consider local folks (I am in Augusta, GA). However, EMP did have good customer service in my opinion and I actually talked to the owner two to three times trying to figure this out. |
02-28-2011, 05:12 PM | #63 | |
nimda
Join Date: Jun 2007
Posts: 13,022
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Re: EMP Motor squeal/squeak
I still think its controller whine, especially since you say it doesn't do it in Torque mode. If it was mechanical it should do it in either mode.
From a Curtis manual Quote:
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02-28-2011, 07:32 PM | #64 |
Gone Wild
Join Date: Feb 2011
Location: Florida USA
Posts: 162
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Re: EMP Motor squeal/squeak
It is the controller making the motor windings resonate in that critical situation.
The curtis 1231c did that on purpose by switching to a different frequency at low rpms. Here is a snippet from an online conversation/argument about it: "The brief bit of whine when accelerating is NOT a big deal, and it provides significant benefits. Having that short period of low frequency chopping allows the controller to have a smooth takeoff with the commonly used 9" ADC series motor. Only required evidently, in a poorly designed Curtis 1231C. Funny, DCP Raptors and T Rexes didn't need the squealing frequency to get the job done....and, they were far smoother on take-off than the Curtis! Funny, Auburn Kodiacs and Grizzlies didn't need the squealing frequency to get the job done....and, they were far smoother on take-off than the Curtis!..." I don't think your controller is supposed to do that but no doubt that is the noise! |
02-28-2011, 07:56 PM | #65 |
nimda
Join Date: Jun 2007
Posts: 13,022
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Re: EMP Motor squeal/squeak
Ive heard controller whine on stockers as well as modified carts. It's just the match of parts. If it were mechanical whatever it might have been would have gave up the ghost by now.
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02-28-2011, 09:26 PM | #66 |
Gone Wild
Join Date: Feb 2011
Location: GA
Posts: 235
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Re: EMP Motor squeal/squeak
Hey buddy,
That sucks that you paid all that money for something that you are not 100% satisfied with (if it is the motor). For me, that noise would NOT be acceptable! I just did some quick searching and it looks like you have a 94 series with some other upgrades???? Also, I see you live in Augusta. Look, I know how you feel and will put this on the table. I live in Athens and if you want, one weekend you can come up to the house and do some INTENSE trouble shooting! I’m not sure about all your upgrades but we can do some parts swapping to narrow it down. I’m not familiar with the EMP motor but I have a Stock motor and a D&D high torque motor. One way we can eliminate you axle completely is putting mine on you cart. If the noise still persist, you know for sure that it is not the axle! I will SOON have the LGS 700 amp controller and have the stock Curtis controller that can be swapped around to eliminate the controller. We can switch around any part of mine to yours, or vice versa, to narrow down the problem. If you put a known non noise making part on your cart and it still makes the noise, you know FOR SURE that it is NOT that part. I know it would be a pain in the ACE but, we could for sure narrow down the problem. Just throwing the offer out there, you seem like a pretty good guy! List of my upgrades 95 medalist 48V upgrade 2 gauge wires HD F/R HD solenoid 700a logisystems controller D&D motor |
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