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3.4.3
Precautions for Driving the Motor
(1) Motor Current Control
When the motor speed decreases during printing because of the division drive method, the contents of
print data, or input data transfer speed, noise and overheating of the motor may occur due to over-
torque of the motor.
To prevent these symptoms from occurring, control the motor current as follows:
When driving the motor, always set the motor current for each phase at 300 mA or less.
(2) Acceleration Control
When driving the motor, acceleration control is needed to start paper feeding. When the motor is to be
driven at the motor drive frequency that is calculated using equations (1) and (2) calculated in Section
3.3, the motor may come out of step under heavy load.
Drive the motor to the maximum driving speed that is calculated using equations (1) and (2), according
to the acceleration steps in Table 3-5.
The method for accelerating the motor is as follows;
1. Output start step for 5000 µs.
2. Output first step for the first acceleration step time
3. Output second step for the second acceleration step time
4. Output nth step for the nth step acceleration time
5. After outputting the time calculated using equations (1) and (2), the motor is driven at a constant
speed.
The printer can print during acceleration.
3-10
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