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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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#1
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OT motor speed question
Hi, did a search for the answer to my question and found this forum
which seems very knowledgeable about motors and speeds related to them. I recently had a treadmill motor replaced on my treadmill. The original motor was 2hp. For some reason the replacement the technician got was a 2.5hp. After he replaced the motor and left, I noticed that the speeds of the treadmill now seemed slower than what I set the treadmill for. After some rough calculations I determined it to be about 80% of the speed I set. (ie. I set the treadmill to jog at 5 mph, but I am now walking at 4 mph) Does this make sense given that a larger motor was put in but no changes to the circuit boards etc) Everything else remained constant. Thank you in advance, Jim |
#2
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OT motor speed question
wrote in message oups.com... Hi, did a search for the answer to my question and found this forum which seems very knowledgeable about motors and speeds related to them. I recently had a treadmill motor replaced on my treadmill. The original motor was 2hp. For some reason the replacement the technician got was a 2.5hp. After he replaced the motor and left, I noticed that the speeds of the treadmill now seemed slower than what I set the treadmill for. After some rough calculations I determined it to be about 80% of the speed I set. (ie. I set the treadmill to jog at 5 mph, but I am now walking at 4 mph) Does this make sense given that a larger motor was put in but no changes to the circuit boards etc) Everything else remained constant. Might have put in a different pulley or gear size. |
#3
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OT motor speed question
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#4
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OT motor speed question
Just the motor was replaced with another treadmill motor from the same
company. It is just more horsepower. |
#6
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OT motor speed question
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. |
#7
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OT motor speed question
wrote in message ups.com... 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. |
#8
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OT motor speed question
On Fri, 16 Dec 2005 06:35:32 -0500, "George" George@least wrote:
Gentlemen, read the post. It's a treadmill motor with no intrinsic speed, rather it's controlled by something else which was not replaced. 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.) 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. 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 |
#9
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OT motor speed question
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 |
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