LTPH245 datasheet(24/64 Pages) SII

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3-11

(2) Acceleration Control

When driving the motor, acceleration control is needed to start paper feeding. When the motor is to be

driven at the maximum motor drive frequency that is calculated using equation (1), the motor may come

out of step under heavy load.

Drive the motor to the maximum driving speed that is calculated using equation (1), according to the

acceleration steps in Table 3-5.

The method for accelerating the motor is as follows;

1. Output start step (6580 (

µs)) for the time calculated using equation (1)

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 equation (1), the motor is driven at a constant speed.

The printer can print during acceleration.

Table 3-5 Acceleration Steps

Number of

Steps

Speed

(pps)

Step Time

(

µs)

start

152

246

318

379

433

493

547

597

644

687

728

768

805

840

874

907

939

970

1000

6580

4066

3140

2636

2311

2028

1828

1675

1553

1456

1374

1302

1242

1191

1144

1103

1065

1031

1000

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