LG WM2277H Series, Training Manual

Page: 24 / 82

WM2277 WASHER PAGE 26 of 84 TRAINING MANUAL
DIRECT DRIVE MOTOR
The motor is a direct-drive, brushless,
DC motor. It is attached to the drum via
a splined shaft, eliminating belts,
pulleys, transmissions, and the
inherent problems associated with
them.
The rotor is attached to the shaft by
one large (17 mm) bolt. Remove the
bolt by holding the drum and turning.
When the rotor is removed, you can
remove the stator. Loosen the six bolts
holding it to the tub and lift it away. Be
careful of the wiring. You must remove
a connector that powers the stator and
another that connects to the hall
sensor.
When reassembling the motor, these
connectors must be reassembled
before the stator is mounted.
Stator Resistance Readings
Pins 1 ~ 3 5 ~ 15 Ω
Pins 2 ~ 3 5 ~ 15 Ω
Pins 1 ~ 2 5 ~ 15 Ω
The DC motor can be driven from
stopped to maximum speed in infinite
steps in either direction. There are 36
poles on the stator; 12 permanent
magnets spaced around the rotor.
There are no brushes to wear out.
Unlike a more traditional brushless
motor, the rotor surrounds the stator
rather than being attached to it.
A Hall Effect sensor determines the
speed and direction of the motor.
It also can read that the load is off
balance when the drum speed
fluctuates. (See page 25.)