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I have a bonaire evap cooler, it is about 15 years old I think, it has a 750 watt variable speed motor. Recently the motor brackets broke, I replaced these but the motor seemed to have a "torque spasm" causing the motor to twist exessivly which led to the brackets breaking. I replaced the motor but it still has this "spasm" not as severe but I am worried that the mounts will break again. What else can be wrong or am I just paranoid?

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  • epveenhof Mar 15, 2011

    Thank you for your response, I understand the torque at start up, but what I am talking about is once the speed has stabilised it is a jerky twist at a regular interval and is worse at low speed than at high speed, probably because the frequency is higher at the high speed. Could there be something wrong with the electronic speed control, perhaps on the cicuit board? Since the brackets have lasted at least 15 years I must presume that they should be okay. Regards Evert

  • epveenhof Mar 16, 2011

    I have a bonaire evap cooler, it is about 15 years old I think, it has a 750 watt variable speed motor. Recently the motor brackets broke, I replaced these but the motor seemed to have a "torque spasm" causing the motor to twist exessivly which led to the brackets breaking. I replaced the motor but it still has this "spasm" not as severe but I am worried that the mounts will break again. This jerky movement is at a regular interval and the frequency increases with speed but is let severe at high speed, could it be something faulty in the speed control?

  • epveenhof Mar 16, 2011

    Hi thanks for the response but I don't have a belt drive, this is a direct drive, the original motor still runs and has no burnt coils or smells this is why I think there may be something wrong with the speed control. Regards Evert

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  • Master
  • 359 Answers

I am assuming you are talking about the fan motor. The motor should be ok, a torque "spasm" can be expected when it starts unless it has a drive to bring the motor up slowly. You didn't say that there is one, so I assume again that there isn't. Though it is variable speed; even if you start it on low the fan will have its largest load, you can check the alignment of the belt if there is one to the fan. If its a direct drive you can check the alignment of the shaft to the blade. I personally would pick up some brackets, or uni-strut and reinforce the mounting plate to put less strain on the motors standard brackets. I believe that would put my mind at ease. Hope this helps. Let me know if you need further assistance.Thanks.

Posted on Mar 16, 2011

  • Alan Conner
    Alan Conner Mar 16, 2011

    For there to be a torque spasm while running it sounds like you may be right regarding the speed control. the speed control may be shorted, or worn out causing a spike in amps to the motor. I presume this is a single phase system, but another thing to check is that the motor may be kicking over to the opposite direction. I don't have any pictures of it, so I can't be positive. But a lot of electric motors have directional controls as well. If you could send a few pics that would be great! thanks.

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  • Master
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Hi, these motors do twist some, but not enough to break the bearing hold down clamps. Some torque is normal. The old ones were just weak and probably rusted. Check your belt for the proper tightness. If it is to tight, it will cause this. Take your index finger and with power off, push down in about the middle of belt. There should be about 3/4 of an inch play in it. You are probably a little paranoid from the first motor, but this is normal for these high torque motors.
Shastalaker7
A/C, & Heating Contractor

Posted on Mar 16, 2011

  • Robert Horton
    Robert Horton Apr 10, 2011

    I am not sure if you have solved this problem, but knowing this is a direct drive motor and it has a motor control, this would be your problem. This control board will cause this variable speed motor to go crazy if you loose the control board, and cause excessive torque on the mounting brackets. We use these on the new a/c units now, and this happens a lot when the control has a problem, the motor will be fine, but the control board its self will fell causing all heck to break loose. I hope you are up and running. No beefed up brackets are needed, as it didn't come with it anyway, it is a matter of a new motor control board.
    Shastalaker7

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  • Master
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750 watt motor is very powerful. Going from the "off" position ot the "hi speed" position on the fan control may be what is causing the sudden torque. Start at the lowest fan speed, and give the fan time to normalize at each speed before going to the next higher setting. If the excess torque still happens, more sturdy brackets may be necessary. If the fan "on and off" is controlled by a thermostat, setting the fan speed to the maximum speed could cause "torque twist" each time it starts up. Try running it at a lower setting and see if the torque is more manageable.

Posted on Mar 15, 2011

  • Jackie Miles
    Jackie Miles Mar 16, 2011

    Sorry, Evert. I don't have any more ideas. Hopefully, another expert will be able to help you. Good luck.

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