42113901 Rev.2
23 /
Oki Data CONFIDENTIAL
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
(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.
Содержание ML421 Series
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