Rf Motor Driver Circuit - Epson DFX-5000+ Service Manual

Specification
F o r m
Supply voltage
Internal coil resistance
Frequency
Current consumption
* HB = Hybrid
** pps = pulses per second
*** ips = inches per second

RF Motor Driver Circuit

Figure 2-28 shows a block diagram ofthe RF motor driver circuit, and Table 2-7
provides the RF motor specifications. The RF motor is a stepping motor. The
control circuit performs open-loop phase switching control according to the timing
data for acceleration, constant speed, and deceleration. CPU ports PGlO to PG13
output the motor phase switching signals. The control method is not equipped
with a hold circuit for changing the motor phase. The RF motor rotates when the
carriage moves.
EPSON DFX-5000+ Service Manual
Table 2-6. PF Motor Specifications
4-phase, 200-pole, HB* pulse motor
35 VDC f 6% (applied to the driver circuit)
2.85 R f 0.32 R per phase at 25°C (77°F)
4274 pps** (normal mode, constant driving): 9.9 ips***
2610 pps (middle speed mode, constant driving): 6 ips
Driving: 1.95 A, 0.20 A per phase (average)
Holding: 0.26 A, 0.02 A per phase (average)
Figure 2-28. RF Motor Driver Circuit
Operating Principles
Description
2-39