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Hi there everyone and merry xmas to all...
In certain treadmills, the speed by which the user is running is measured and calculated using a mounted sensor near the rotor of the motor. However I found that some treadmills lack this sensor, and I am seriously wondering how this could be achieved? I know that the more the motor is rotating, the more current it consumes, but I hope to know the formula relating electrical quantity(ies) to the rotation per minute (rpm).
Thanks in advance...
If the treadmill has a DC motor, the speed controller's output voltage sets the motor speed. If the treadmill has an AC motor, the speed controller's output frequency sets the motor speed. Both types of speed controllers can control the speed reasonably well without feedback.
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