Sensorless commutation of micro PMSMs for high-performance high-speed applications

Abstract

This paper presents a preliminary analysis of a sensorless sinusoidal commutation of micro slotless PMSMs which can be used in high-performance, high-speed applications. Since the inductance of a micro slotless PMSM is extremely small, three-phase back electromotive forces (BEMFs) can be estimated with a first-order delay filter. The terminal phase voltages of the micro PMSM are generated based on the estimated BEMFs and a required current amplitude. The resulted terminal voltages are sinusoidal and almost synchronous to BEMFs in a high operating-speed range.

Optimal Adaptive Super-Twisting Sliding-Mode Control Using Online Actor-Critic Neural Networks for Permanent-Magnet Synchronous Motor Drives

“…the system nonlinearities, parameter variations and extrinsic load disturbances should be eliminated through the attenuation level. Constructively, the entire nonlinear dependence could be intended into the parameter uncertainties (7) as well as the proposed controller can be designed robust adequate to withstand unmodeled dynamics as well as uncertainties. The nonlinear continuous functions g(x) as well as f(x) are considered uncertain along with bounded, the exterior disturbance d is bounded as well unidentified, along with gx) & f(x) are unidentified bounded uncertainty.…”

“…According to these suppositions, the unknown lumped uncertainties D(x) possesses un upper bound D(x(t)), as >0. According to (7), the lumped uncertainties D(x) rely on the u(t), which is the control input, parameter disparities along with the exterior disturbance. Thus, exterior disturbances, parameter disparities, along with nonlinearities can be disregarded through designing a robust controller for the PMSM.…”

“…Encoderless speed control approaches have been presented [6]- [12]. For micro PMSMs encoderless control, the rotor position angle is be estimated in the control approaches [6], [7]. In [8]- [10], an observer for estimating the rotor position angle of the micro PMSM along with robust H  controller have been presented.…”

Design and implementation of a wavelet speed controller with application to micro‐permanent magnet synchronous motor drives

“…For example, Neugebauer et al [16] proposed a six-phase multilevel inverter for a micro-motor. Zhang and Jiang [17] presented a novel adjustable micro-PMSM control system without using a rotor position or speed sensor. Chou et al [18] proposed an adaptive inverse controller for a micro-PMSM control system.…”