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Permanent Magnet Stepper Actuators

Permanent Magnet Stepper Actuators

Permanent Magnet Stepper Actuators differ from variable reluctance stepper actuators by having permanent magnet rotors with no teeth. These rotors are magnetized perpendicular to the axis. When the four phases are energized in sequence, the rotor rotates as it is attracted to the magnetic poles. The motor shown in Figure 6 will take 90 degree steps as the windings are energized in sequence ABCD. Permanent magnet stepper actuators generally has step angles of 45 to 90 degrees and tends to step at relatively low rates, but produce high torque and excellent damping characteristics.

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