Oki 3320, 3321 specifications Hall AMP Input Output SPU SPV SPW Open

2.1.6SP/LF Motor Control

(1)Space motor control

The SP motor driver (HA13412) drives the three-phase brushless motor based on the phase signal (SPU, SPV and SPW) and the speed instruction data from the LSI. 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

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

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