Main Motor; Main Motor Drive - Toshiba DP1600 Service Manual

10.4 Main Motor

10.4.1 Main motor drive

Main PWA
IC34
MMCLK
29
System control GA
MMON
72
MMSYNC
23
IC6
MMBRK
43
I/O port GA-2
MMDIR
44
(1) The system control GA (IC34) on the Main PWA sends the MMCLK signal to the main motor.
(2) DP1600 series
The I/O port GA-2 (IC6) on the Main PWA sends the MMON signal at "High" level to the main motor.
This allows each excitation phase of the motor to be excited through the motor drive circuit to start
rotation.
DP2000/2500 series
The I/O port GA-2 (IC6) sends the MMON signal at "High" level, MMDIR signal at "Low" level, and
MMBRK signal at "High" level to the main motor. This allows each excitation phase of the motor to be
excited through the motor drive circuit to start rotation.
(3) For the main motor, the motor drive circuit detects the rotor position in the motor and the rotational
frequency (FG pulse). It compares the detected rotational frequency with the MMCLK signal in terms
of phase and speed. It adjusts the excitation timing to eliminate the difference in each comparison and
control the rotation of the motor. When the difference in each comparison is then eliminated and the
rotation stabilizes, the main motor sends the MMSYNC signal at "Low" level to the I/O port GA-2.
1600/2000/2500 DRIVE SYSTEM
Relay PWA
+5V
SG
IC3
42 42 5 6
Q18
44 44
SG
43 43
39 39
40 40
Q17
SG
13 12
IC3
VM
PG
10 - 12
Main motor
6 ( 6 ) 1 ( 3 )
5 ( 5 ) 2 ( 4 )
3 ( 3 ) 4 ( 6 )
1 ( 1 ) 6 ( 8 )
4 ( 4 ) 3 ( 5 )
Motor drive
circuit
2 ( 2 ) ( 7 )
5
NC
( 7 ) ( 2 )
1,4,5 1,2,5
2,3 3,4
Values in ( ) are for DP2000/2500 series
Phase/Speed detection ( FG pulse )
Rotor position detection
06-04-01
December 2000 © TOSHIBA TEC