Oki ML490 Maintenance Manual - Page 23

Oki ML490 Manual

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(1) Space Motor Control The SP motor driver (MHM2025) drives the three-phase brushless motor based on the phase signal (SPU, SPV and SPW) from the LSI and the speed instruction data from the MPU. The MPU can identify the current speed of the space motor by measuring through the LSI the pulse length of the output (øA, øB) of the slit encoder included in the space motor. By comparing the target speed for each print mode with the actual current speed to change the speed instruction data, the motor speed is accelerated or decelerated to maintain the specified speed for each print mode. SPU SPV SPW HALL SPU H H H L L L AMP SPV H L L L H H SP truth table INPUT OUTPUT SPW U V W L OPEN L H L L OPEN H H L H OPEN H OPEN H L H H OPEN L L H L OPEN 42114101 Rev.1 23 /

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42114101
Rev.1
23 /
(1)
Space Motor Control
The SP motor driver (MHM2025) drives the three-phase brushless motor based on the
phase signal (SPU, SPV and SPW) from the LSI and the speed instruction data from the
MPU. The MPU can identify the current speed of the space motor by measuring through
the LSI the pulse length of the output (øA, øB) of the slit encoder included in the space
motor.
By comparing the target speed for each print mode with the actual current speed to change
the speed instruction data, the motor speed is accelerated or decelerated to maintain the
specified speed for each print mode.
SP truth table
HALL
AMP
INPUT
OUTPUT
SPU
SPV
SPW
U
V
W
H
H
L
OPEN
L
H
H
L
L
L
OPEN
H
H
L
H
L
H
OPEN
L
L
H
OPEN
H
L
L
H
H
H
OPEN
L
L
H
L
H
L
OPEN
SPU
SPV
SPW