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Section 4. Electrical Components & Testing
4-5
16010486 (16008373-05)
Revised 02/01
©2001 Maytag Appliances Sales Company
DRIVE MOTOR
The drive motor is still a switched reluc-
tance type motor. (For more information,
please refer to manual 16008373, Sec-
tion 4; Drive Motor.)
The new motor is a sensorless motor
drive system. The word "sensorless"
indicates that motor direction and speed
detection are performed electrically
without the aid of the sending device.
Meaning, the sensor was eliminated from
the end of the motor along with the wire
harness leading to the RPT connection on
the motor control board.
Motor Control Access
Slight modifications were made to the
motor control bracket and the plastic drip
shield.
Drip Shield Removal
1. Push the plastic shield on either side of
the locking tab to buckle and unlock
the shield from the motor control
bracket. (Figure 4-4)
Motor Control Board Removal
1. Pull the vertical tab forward and lift the
front of the motor control board and
slide the control forward to lift and
remove the control from the bracket.
(Figure 4-5)
MOTOR CONTROL BOARD
The motor control is able to determine
the motor's position by monitoring the
active phases in the motor. This is done
by sending pulse signals to the motor and
then timing the echo signal. By doing this,
the motor control is able to deterimine
the motor speed and direction. This
information is then calculated to deter-
mine the motor speed.
The motor control has a software switch
in it that will turn off all power devices for
as long as the main voltage is above 133
VAC. Once the mains voltage drops
below that voltage, the power devices will
be re-enabled and the motor control will
resume normal operation.
2. The motor control board bracket is
secured with two screws in front and
secured to the baseframe via a tab on
the bracket inserted into a slot in the
baseframe.
Figure 4-4
Figure 4-5