Page 254 - Adaptive Identification and Control of Uncertain Systems with Nonsmooth Dynamics

Hysteresis Dynamics and Modeling 255

16.3.3 Hysteresis Motor
Hysteresis motor [15] is a self-starting synchronous motor, which uses the
hysteresis characteristic of the semi-hard magnetic materials. It consists
of polyphase stator and rotor with hysteresis ring. In most of the cases,
semi-hard magnetic material is used for the hysteresis ring. The adequate
thickness of the hysteresis ring should be determined in the hysteresis mo-
tor, and then the motor torque is calculated based on the area of hysteresis
loop determined by the field intensity in the ring. The hysteresis ring is
affected by the rotational hysteresis caused by the stator windings [16]. In
general, the thicker the hysteresis ring becomes, the larger the rotational
hysteresis increases and to make matters worse, the output of the thicker
ring motor becomes less than that of thin rotor motor.

16.4 CONCLUSION

This chapter introduces several well-recognized hysteresis models, which
have been used to describe the hysteresis behaviors encountered in smart
materials, piezoelectric motors, and MR dampers. Some of these models
will be used in the following chapters, where the identification and the
associated compensation and control designs will be presented for several
typical non-linear systems, e.g., vehicle suspensions.

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