Theoretical Derivation of Phase Current Profile for Switched Reluctance Motors to Suppress Radial Force Ripple and Torque Ripple

Kusumi, Takayuki; Hara, Takuto; Umetani, Kazuhiro; Hiraki, Eiji

doi:10.1109/isie.2018.8433685

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…Hybrid stepper motors have been extensively modelled in [16] with regard to static parameters and those varying with position or current. Inductance is known to vary significantly with angular position in a switched reluctance motor [6]. Hybrid stepper motors have shown small inductance variation with anglular position [16].…”

Section: B Motor Modelmentioning

confidence: 99%

“…Optimization of drive waveforms based on modelling of the motor has shown reduction of vibration [8] and noise [6] but relies on the accuracy of the model. This work instead iteratively optimizes the physical system as a single black box, without limiting the correction to known and modelled characteristics.…”

Section: Waveform Optimizationmentioning

confidence: 99%

“…This work instead iteratively optimizes the physical system as a single black box, without limiting the correction to known and modelled characteristics. Torque variations are recognized as a source of noise and vibration [4] among other electromagnetic characteristics of a motor [6], [8] but gaps still remain in the modelling as in [1]. A source of torque variation is angular position accuracy.…”

Section: Waveform Optimizationmentioning

confidence: 99%

“…An ideal motor could rotate with a constant torque or speed. In practice variations in the motion are introduced by current drive waveforms [9] which are not matched to the physical characteristics of the motor [6], [8]. If not compensated, when placed inside a closed loop controller these variations create resonances.…”

Section: Introductionmentioning

confidence: 99%

“…As significant vibration energy is harmonically related to the drive frequency, improved drive waveforms can be found that reduce vibration. Using analytical models of the motor, theoretically optimal waveforms have been found analytically [6] or by numerical optimization [8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Reducing Position Errors by Vibration Optimization of Stepper Motor Drive Waveforms

Pillans

2021

IEEE Trans. Ind. Electron.

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Open loop control of stepper motors reduces system cost and complexity for positioning systems. To produce a precise current waveform, a novel open loop control implementation of a hysteresis current controller (HCC) is presented and compared to the existing pulse width modulation (PWM) method. The new method extends the resolution available for a given sampling rate, allowing finer control of the motor current. Applications for precision positioning minimize external disturbances but a real, nonideal, motor introduces vibration and non-uniform motion. Microstepping of the drive waveform approximates a continuous motion to reduce these effects but they are not fully modelled or understood. The proposed current controller is assembled with a hybrid stepper motor to verify the method experimentally. A differential evolution (DE) optimizer is applied with the complete physical system in the loop. To measure vibration, a low cost contact microphone is used, eliminating the requirement for expensive rotational sensors. This method is shown to reduce vibration across different speeds. Comparing the microstep positions of a standard sinusoidal waveform and the waveform optimized to reduce vibration, an improvement in position accuracy is also found.

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Section: B Motor Modelmentioning

confidence: 99%

Section: Waveform Optimizationmentioning

confidence: 99%