LG WM3677HW Training Manual page 43

COMBO
This motor is a 36-pole DC direct-drive motor. There are 12 magnets
permanently attached to the rotor. Each magnet is opposite 3 poles of the stator
at any given time. A Hall Effect sensor is mounted on the stator. It counts the
poles of the magnets as the rotor turns to feedback the information to the
controller. The motor controller can determine the direction and speed of rotation
by adjusting the polarity and amplitude of the power applied to the stator.
WM3677 COMBO
MOTOR (continued)
The Hall Effect sensor is easily
removed and replaced. You'll have to
remove the rotor and stator to access
the sensor. The rotor is splined and fits
snugly on the drum's shaft. When
replacing the rotor, you will probably
need a helper to hold the drum in place
while you push the rotor onto the shaft.
Otherwise, the drum may move forward
far enough to make it difficult to replace
the bolt. The helper can also keep the
drum from turning while you torque the
bolt.
Before going to this trouble, check the
connector on the main board. It is the
3-pin red connector nearest the heat
sink. (This connector has the red wire
in the middle instead of on one end.)
You can separate this connector to
determine that the board is receiving
signals from the Hall Effect sensor.)
wrong connector it is the yellow one
near the top
Page 43 of 68 TRAINING MANUAL