A new method for the calculation of the slip frequency for a sensorless speed control of a squirrel-cage induction motor

Beck, Manfred; Naunin, Dietrich

doi:10.1109/pesc.1985.7071009

Cited by 10 publications

(1 citation statement)

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“…For an ordinary AC motor, speed sensorless technology has been widely studied. The adopted methods include the direct calculation method [29], model reference adaptive system (MRAS) method [30], extended Kalman filter (EKF) method [31], adaptive full order observer [32], the high frequency signal injection (HFSI) method [33], and the sliding mode observation (SMO) method [34]. Regarding the speed/position sensorless technology of a BLM system, some studies have been carried out, most of which refer to the research ideas of an ordinary AC motor.…”

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confidence: 99%

Research on the Speed Sliding Mode Observation Method of a Bearingless Induction Motor

Chen

Qiao

2021

Energies

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In order to achieve the speed sensorless control of a bearingless induction motor (BL-IM), a novel sliding mode observation (SMO) method of motor speed is researched. First of all, according to the mathematical model of a BL-IM system, the observation model of stator current and that of rotor flux-linkage are derived. In order to overcome the chattering problem of a sliding mode observer, a continuous saturation function is adopted to replace the traditional sign function. Then, the SMO model of motor speed is derived, and the stability of the proposed motor speed SMO method is validated by the Lyapunov stability theory. At the end, the observed motor speed and rotor flux-linkage are applied to a BL-IM inverse “dynamic decoupling control” (DDC) system. Simulation results show that the real-time observation or dynamic tracking of motor speed and rotor flux-linkage are achieved in a more timely manner and more accurately, and higher steady-state observation accuracy is obtained; the proposed SMO method can be used in the BL-IM’s inverse DDC system to realize reliable magnetic suspension operation control without a speed sensor.

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