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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