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Advanced angle commutation is an effective approach to suppress the commutation torque ripple for doubly salient electromagnetic machine (DSEM). In this paper, the commutation process under “three-phase three-state” conduction mode is analyzed in detail at first. On this base, a novel self-optimizing control strategy of advanced commutation angle for DSEM is proposed, it starts with setting an initial...
In high-frequency (HF) pulsating voltage injection-based sensor-less surface-mounted permanent magnet synchronous motor (SPMSM) control, inverter nonlinearities and motor parameter asymmetries lead to harmonic errors in the estimated position. To eliminate these errors, the second-order generalized integrator (SOGI) is applied. An enhanced position observer with a selective harmonic error eliminator...
The air gap of tubular linear motors moves linearly, causing heat transfer states of the motor to alternate repeatedly. Thus, the heat transfer coefficients of the mover inner surface and the stator outer surface vary constantly. In this paper, the combination model of the thermal circuit and temperature field is established to calculate the transient temperature rise of a tubular linear motor with...
The doubly salient electro-magnetic motor (DSEM) is subject to significant torque ripple when working with traditional standard angle control method. To weaken the effects of the torque ripple for further applications of DSEM such as wind power generation and aerospace, in-depth analysis of the ripple generation mechanism and two novel strategies of inner torque loop and torque distribution control...
Conventional PI regular is a simple control method that is widely applied in permanent magnet synchronous motor (PMSM) control systems. However, in most cases, it cannot meet the requirements of high performance control. In order to improve system robustness and response, this paper adopts sliding mode variable structure control strategy in the design of a double-loop controller (speed loop and current...
In this paper, a sliding mode control based on reaching law control (RLC) is proposed for permanent magnet synchronous motors (PMSM) drive system. The PMSM is a typical multi-variable nonlinear system with strong coupling. It is sensitive to load disturbances and changes of interior parameters, so conventional PID control can't meet the application requirements where high performance is required....
A dual redundancy electrical mechanic actuator designed for high-performance and high-reliable aero electrical drive systems is studied in this paper. The dual redundancy system contains two coaxial permanent magnet synchronous motors (PMSM), two independent power converters with intelligent power modules (IPM) and two position sensors. In the dual redundancy vector control, a novel space vector pulsewidth...
A novel space vector pulse width modulation (SVPWM) algorithm is proposed in this paper, which can improve the real-time response of servo control. Firstly, a unique coordinate system is set up, and then its corresponding modulation strategy suitable for the entire space vector plane is also presented. Compared to the conventional SVPWM method, the new algorithm can eliminate the process of the space...
In order to implement the speed control and improve the robustness of permanent magnet synchronous motor (PMSM) servo systems associated with the sliding-mode control (SMC), a compact integrated SMC controller designed for position servo systems is proposed in this paper. The merits of the SMC approach and PID control are combined to design this novel integrated controller. Some integral and feedforward...
A novel control method for Permanent Magnet Synchronous Motor (PMSM) position servo systems is presented, which can greatly improve the dynamic performance of servo systems. In this method, the maximum reaching velocity control is introduced to reconstruct the conventional three closed-loop PID regulators. Under the new velocity and position control modes (two-segment modes), the PMSM servo systems...
The configuration of a permanent magnet synchronous motor (PMSM) system of one dual-redundancy PMSM and two inverters is presented in this paper. The angular difference problem is studied because the two motors are connected to the same shaft with a different alignment, and the importance of compensating the angular difference is presented. In addition, this paper offers a method to measure the angular...
In this paper, the fault tolerant system for doubly salient electro-magnet motor(DSEM) drives have been proposed to maintain the control performance under open phase faults of inverter. The proposed fault tolerant system provides compensation for open-circuit faults in power inverter. The fault identification is quickly achieved by phase current and voltage changes between lower legs and middle point...
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