To
avoid problems, it is important to
-
purchase treadmills with motors of high quality and appropriate dimensions,
-
regularly maintain them
-
reduce the coefficient of friction between the belt and deck as much as possible, replacing the belt at regular intervals.
Let's
see why these factors are so important
How
does the DC treadmill motor work? It is important to have knowledge
of the basics so you can understand why it is important to test the
treadmill motor properly.
The
following applies to most domestic treadmills and some commercial
treadmill motors. It does not apply to AC motors, which are mostly
used in new commercial treadmills (treadmills for fitness centers and
wellness centers).
Permanent
magnets (PMDCs) or DC motors are built using fixed magnets mounted
around the inside of the chassis. Between the magnets, the center of
the engine (inductor) is made by
-
a bearing shaft,
-
a wrap (winding) which consists of wires, insulated from each other by an insulating resin,
-
insulating material and
-
metal blades (battery).
The
shaft connects the motor to the running belt of the treadmill via a
drive pulley and a transmission belt. The motor provides energy to
start the treadmill when you press the start button. But how does the
motor convert electrical energy into motion?
Mounted
on the shaft inside the engine there is a core of iron (rotor) and
around it there is a wrap of copper wires known as windings or coil.
An electric current is passed through the windings of the motor.
The
current comes from a motor control board that is connected to the
motor via two brushes. The engine controller's job is to change the
AC (alternating, usually 220/240) voltage into the DC and adjust the
voltage.
The
motor would not work (indeed it would be damaged) if it was directly
connected to the wall outlet. The motor control card also allows you
to change the motor speed by adjusting the voltage to the motor
according to the speed set on the treadmill console.
When
the electric current passes through the windings inside the magnetic
field (created by permanent magnets), the shaft rotates to bring the
magnetic balance back to the engine rotation. The rotational power of
the motor depends on the force of the magnetic field created by the
permanent magnets and the amount of current which travels through the
copper windings. Therefore, the bigger the diameter of the motor is
the better it is. Because the magnetic field of the permanent magnets
is greater and the power at the same current is greater.
In
the motor, it is important to couple the concept as it is necessary
to make sure that you have a sufficient torque so that the treadmill
moves smoothly when you are on it. The motor torque is normally
indicated in Watt or Horse Power (HP).
You
can increase the torque by increasing the magnetic field of permanent
magnets (i.e. using a larger motor) or by increasing the current
flowing through the windings. In practice, it is not possible to
increase the magnetism of permanent magnets (they are permanent and
cannot be changed). So you need to increase the current through
windings to get more torque.
The
amount of current that can pass through copper wires is limited by
the size of the wires and the capacity of the motor control board
(MCB) that provides electrical current. If you try to pass too much
current you can burn copper windings, which will cause them to blend,
or overburden, destroying them.
Small
electric dissipation can go unnoticed in a bench test or running the
motor with a car battery, but this can cause problems when the engine
is connected to the control board and subject to high voltage. http://www.partsfortreadmill.com/
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