Rf Motor Drive Circuit - Epson DFX-8500 Service Manual

DFX-8500

2.3.6 RF Motor Drive Circuit

Figure 2-24 shows a block diagram of the RF motor drive circuit, and Table 2-10 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 PG10 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.
Specification
Form
Supply Voltage
Internal Coil Resistance
Frequency
Current Consumption
Driving Method
2-30
Table 2-10. RF Motor Specifications
4-phase, 48-pole, PM pulse motor
37 VDC (applied to the drive circuit)
150 ohms + 10 % per phase at 25
720 pps
Driving: 0.10 A (average)
Constant voltage driving, 2-2 phase drive
Figure 2-24. RF Motor Drive Circuit Block Diagram
Description
o
C
Rev. B