Main Motor, 10.3.1Main motor drive | Toshiba 350, 452, 453, 353

10.3Main Motor

10.3.1Main motor drive

The main motor consists of the motor and the drive board combined with the motor, and its rotation is controlled by control signals (three) and reference frequency.

LGC board

Man motor (PC board)

	24v
Wave	Phase
correcton	Phase
	comparator

Man motor (Motor)

FG pulse

Phase V

CN3

(MAMCK)

MAMPL

MAMCW

MAMBK

MAMON

24v

Voltage

Speed

detecton

Exctaton

crcut

comparator

phase

swtchng

secton

Rotaton

Rotor

control

poston

detecton

Lock protecton crcut

Phase W

Hall element A

Photo- nteruptor

Phase U

Hall element C

Hall element B

Fig. 10-301

(1)LGC board outputs the control signals for the main motor rotation. (MAMCW: Motor rotation direc-

tion setting, MAMON: Motor rotation command)

(2)The excitation phase switching section excites each phase of the main motor. → The main motor is rotated.

(3)Hall elements A, B and C detect the rotation position of the motor (rotor).

(4)The excitation phase switching section switches the excitation of each phase. (The motor keeps rotating by repeating from (2) to (4).)

(5)An FG pulse is generated by the FG pattern of the encoder attached to the main motor.

(6)The FG pulse and the reference frequency from the LGC board are compared in terms of the phase and speed, and the difference is added to the IC1. The fluctuations in the power supply voltage is also added to the value. (Signal generation)

(7)In accordance with the signal obtained in the step (6), the excitation phase switching section changes the switching timing.

i.e. The FG pulse and reference frequency are controlled to be equal. → The main motor rotates at a fixed speed. (Locked range)

(8)When the main motor enters the locked range, the excitation phase switching section outputs the MAMPL signal to the LGC board. (“L” level)

(9)When the MAMBK from the LGC board becomes “L” level, the main motor is braked. When the MAMON signal becomes “H” level, the main motor is stopped.

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DRIVE SYSTEM

350, 353, 453, 452 specifications

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Toshiba 350, 452, 453, 353 service manual Main Motor, 10.3.1Main motor drive

Models: 350 353 453 452