Page 693 - Mechatronics with Experiments

ELECTRIC ACTUATORS: MOTOR AND DRIVE TECHNOLOGY 679
Center tapped windings,
connected to the Vbb VBB = VM = 10 V to 44 V

Step motor Phase A Phase B
two phase,
unipolar

1 3 14 16 18
VDD = 3.0 V to 5.5 V
5 Out A Out C VBB Out D Out B
VDD (Out A/) (Out B/) NU 2
7 SLA7051M GA 4
Clock
8 Sync (Translator GB 15
Controller 11 CW/CCW and switch set)
12 Full/Half NU 17
Sensor A Gnd Sensor B
Ref
9
6 10 13

(a)

Out A Out C NU Gate A CW/CCW Full/Half VBB Clock VDD Gate B NU Out D Out B

1 3 2 4 11 12 14 7 5 15 17 16 18
S1
Reg
S2
S3
Translator
S4
Osc Osc

PWM Synchro PWM
control control control

Sleep
+ control +
_ _

6 9 8 10 13
Sensor A Ref Sync Gnd Sensor B

(b)
FIGURE 8.55: An example IC driver for unipolar step motors: SLA7051M by Philips
Semiconductors. The unipolar step motor driver IC has the translator and output power stage
integrated into one small IC package. Source: Adapted from Philips.