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IMPROVED SENSORLESS CONTROL WITH THE ST62 MCU FOR UNIVERSAL MOTOR

Figures 7, 8, 9. Speed regulation performance (with and without regulation) for

set speeds of 1700, 950 and 400 rpm on a 500W drill. Speeds

are measured after reduction, on the tool shaft

01

2

3

4

0

500

1 000

1 500

2 000

speed (rpm)

rms motor current (A)

without

regulation

with regulation

01

2

3

456

0

100

200

300

400

500

600

700

speed (rpm)

rms motor current (A)

without

regulation

with

regulation

0

12345

0

200

400

600

800

1 000

1 200

speed (rpm)

rms motor current (A)

without

regulation

with regulation