Saturday 24 February 2018

Treadmill motor: replace it and adjust the trimmer of the board

Some things to consider when replacing the treadmill motor.
Over time, the ways in which the power ratings of treadmill motors have been calculated have changed. In the past, the c.d. "continuous duty power" S1 was calculated on the basis of the motor insulation class and the type of use (8 duty cycle classes, S1 to S8, defined by the IEC). Subsequently for marketing reasons, powers related to discontinuous operation were used. So, the same engine labeled in the past 3/4 HP (0.75 HP) can now be labeled 2.75 HP, because instead of doing the calculation in S1 class it is done in class 6.
Test of the armature of a motor, weight verification
In general, the real power of the motor depends primarily on the diameter and secondly on the length of the motor (the diameter, however, affects much more). It can be considered that motors with diameter from 8 / 8.5 cm are from about 1.5 HP continuous (some more serious manufacturers mark them 1 HP), a diameter of 9.5/10.0 sounds reasonable for 1.75 HP, 10.5 cm for 2.25, 12 cm for a 2.5 / 2.75. Besides it is difficult to go on motors for domestic use. Small motors break down more frequently (they dissipate heat much worse, have a smaller manifold, etc.). Some construction details could make one motor a bit better than another of equivalent dimensions (e.g. the one in the picture above has the slats of the oblique armature)
Turning the TORQUE trimmer clockwise adjusts the torque given to the motor
When replacing a smaller size motor with a larger one, it is often necessary to adjust the trimmer on the board.
It may be necessary to adjust the IR and LIMIT trimmers (also called TORQUE)
The SPEED trimmer is used to adjust the ratio between the input signal to the motor board (coming from the console) and the relative output on the motor (e.g. from a 5V regulation from the console = 140V to the motor can switch to 5V to the board = 180V to the engine). This adjustment is usually useless because a retraction system (optical or magnetic speed sensor) returns the real speed to the console and the console consequently adapts the signal sent to the engine control card as long as the read speed does not match the one set on the console.

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