OT motor speed question

Might have put in a different pulley or gear size.

Really depends on what kind of motor it is and how the speed is controlled.

In any case, I'd get the guy back and have him fix it _right_. He should have checked it before he left.

Just the motor was replaced with another treadmill motor from the same company. It is just more horsepower.

It sounds like the new motor is a different rpm than the old one... the gain in HP might be a good thing, if the treadmill can be re-calibrated for the slower motor..

mac

Please remove splinters before emailing

the motor has been replaced with a new one with a different speed - the hp would be irrelevent. check the plate on the motor to see if the speeds match the old one - or contcat the motor manufacturers - give them the model nos.. etc - they should be able to tell you if there is any difference in speeds or if you have the wrong motor. in nay case get the tech back out.

Gentlemen, read the post. It's a treadmill motor with no intrinsic speed, rather it's controlled by something else which was not replaced.

This means the must have been some change in the mechanics, or the controller, calibrated to the old, needs to be recalibrated to the new, with its higher draw.

The intrinsic speed is based on the RPM at full armature voltage. For example, if the original motor was 2000 RPM, and the new one 1600 RPM, then what the OP is describing would be what would happen. I seriously doubt there's a feedback loop (tach), so the controller just puts out a given DC voltage at a given mph setting, so two different RPM motors will give different speeds at the same MPH setting, i.e., same voltage. (Ignoring field voltage, which is most likely doable in this case.)

There is no (significant) higher draw at the same load. The higher HP rating is just what it's capable of delivering, but doesn't change what is delivered at a given load (heck, HP is a measurement of load). I'd agree that it needs recalibrated, but the calibration needed is due to the (suspected) RPM difference, not the HP difference. Whether that calibration span is available is questionable, of course. If it's under warranty, as someone else suggested, call the tech and tell him it isn't fixed. If not under warranty, well, .8 multiplied by displayed speed equals treadmill speed. :)

Ricky

Thanks for all the responses. There was a calibration that needed to be done at the control panel that was missed. Tech fixed it today.

Jim

could be that the circuitry regulates current rather than measuring back emf - the larger HP would draw more current for same RPM. or as another poster suggested, it could have had a different pulley, or a third alternative is that the new motor is 120VDC and the old one was

90VDC (I see both >Hi, did a search for the answer to my question and found this forum

Bill

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