AN1947 datasheet(11/36 Pages) STMICROELECTRONICS

Part #	AN1947

Description	ST7MC PMAC SINE WAVE MOTOR CONTROL SOFTWARE LIBRARY

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ST7MC PMAC SINE WAVE MOTOR CONTROL SOFTWARE LIBRARY

plied to the motor by the controller. Together with the frequency synchronization the phase

Φ

must be synchronized according the position of the rotor read by the Hall sensors.

To avoid giving a high voltage value based on the current frequency, a V/F limitation curve is

used to fix the maximum voltage value supplied for that stator frequency.

2.2 VARIOUS CONFIGURATIONS OF HALL SENSORS

In commerce there are motors with different numbers of Hall sensors and various Hall sensor

configurations. The most common PM motors have three, two or one hall sensors. Motors with

three hall sensors can be arranged in two configuration types: 120° spatial distribution or 60°

spatial distribution. Motors with 2 hall sensors have spatial distribution of 90°. Figure 5 sum-

marizes the most common Hall sensor configurations and the relative waveforms of the sig-

nals that are observed from the Hall sensors during an electrical cycle of the rotor.

2.3 PHASE ANGLE

We refer as “Phase Angle” the angle between the H1 edge transition and the 90° of A winding

sinus phase. This value must be set to get the synchronism between rotor and stator and to

optimize the efficiency of the motor. This value can be different for different speed and/or load

condition. See Figure 6.

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