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Drive motor
Description in general
Fig.
The motor is mounted on an axle with rubber
dampeners.
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The V-belt is tightened by turning the motor on
Fig.
the axle and locking it in place using the
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tensioner on the rear side of the motor. The
motor and tensioner have vibration and noise
dampening rubber suspensions.
Construction in general
The motor consists of stator, rotor and end-
shields with ball-bearings. The stator and the
rotor consist of plates, insulated from each other
and welded together. The stator is provided with
slots in which the 2-pole and 18-pole windings
are wound. The windings are impregnated with a
temperature-resistant sound-insulating resin
varnish according to class B. The end-shields are
die-cast. The ball bearings are permanently
lubricated.
Construction of single-phase motor
Single-phase motors have an 18-pole winding
(wash-speed) the same as three-phase motors,
using a continuously connected capacitor, while
the 2-pole winding (extract-speed) is a specially
designed winding with both a continuously
connected capacitor and a starting capacitor.
Function of 3-phase motor
When the stator winding is charged, a magnetic
field will occur, which in turn will rotate the rotor
at a fixed RPM depending upon the number of
poles in the winding. The 18-pole winding gives
the wash speed and the 2-pole winding the
extract-speed. When operating with load, the
speed deviates slightly from the synchronous
(no-load) speed. This difference is called the slip
and is usually expressed as a percentage of the
syncronous speed. The motors will work satisfac-
torily at nominal voltage +10%-15%.
Function of single-phase motor
When the stator winding is charged without a
capacitor, two counteracting magnetic fields are
created. When a capacitor is connected, it will
displace one of the two magnetic fields adding it
to the other, creating a torque turning the rotor in
a specific direction. The RPM is the same as for
the 3-phase motor.
Mechanical and electrical design
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1729
1154
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