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The influences of current amplitudes on four-phase 24/18-pole doubly salient electro-magnetic motor(DSEM) under fault-tolerant operation are studied in this paper. Taking average output torque, output torque ripple and stator copper losses into consideration, the optimal fault-tolerant current amplitude (FTCA) range is obtained. A four-phase full-bridge converter with two bilateral switches is applied...
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...
This paper proposes a novel sensorless speedup method for doubly salient electro-magnetic motor (DSEM). Based on the characteristic that phase self-inductance varies with rotor position, accurate and quick estimation of rotor sector is achieved through three-phase response currents with only one test injection pulse needed. Besides, no negative torque will be produced by the test pulse unless the...
This paper proposes a novel nine-switch converter for the dual stator Doubly Salient Electro-magnet Motor (DSEM) in the compact driving system. The dual stator windings are connected to the dual output ports of the proposed converter, and both the operation principle and normal commutation method for the proposed system are analyzed. The interaction of the coupled outputs of the nine-switch converter...
Excitation fault is troublesome because it takes a negative impact on the overall performance of the doubly salient electromagnetic machine (DSEM). To deal with the excitation fault, this paper studies the machine design and fault-tolerant control strategies for DSEM driving system with three-phase full-bridge converter. With the view of the unique electromagnetic structure of DSEM, this paper analyzes...
This paper proposes a novel fault tolerant inverter topology for the high reliability of the dual-stator doubly salient electro-magnet machine (DSEM), and thus maintaining the undegraded output performance after the open-circuit or short-circuit fault. The proposed topology adopts the diverter switches to reconnect the floating phase windings, and reconfigures the dual-inverter to be the five-leg...
Power converter open-circuit fault leads to reduction of motor output performance. Fault-tolerant control strategy, which is applied to power converter of four-phase doubly salient electro-magnetic motor (DSEM) drive, is investigated in this paper to improve the post-fault motor performance. A fault-tolerant topology is newly presented. It has the advantage of simple structure with only two bidirectional...
A novel Open-winding Permanent Magnet Synchronous Motor (OW-PMSM) drive system based on the five-leg inverter is presented to reduce the cost, volume and the switching loss of the inverter. Due to the common DC bus of the proposed five-leg inverter, the zero sequence current generated by the inherent 3rd harmonic of the phase back EMF flows through the phase windings and it leads to the weakness of...
A novel wind turbine emulator (WTE) based on a torque controlled Brushless DC (BLDC) motor is presented, which can emulate the steady-state and dynamic characteristics of an actual wind turbine. Variable wind speeds, turbine inertia and torque oscillation caused by tower shadow and wind shear are all considered in the construction of the actual wind turbine model and the torque controlled BLDC model...
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...
In order to research wind turbine (WT) power generation in laboratory conditions, which do not have wind field environment, the power generation has to be imitated. This paper analyzes the operation principle of the WT, model the torque characteristics of WT by controlling the armature current of brushless DC motor (BLDCM). Then establish a strategy and dynamic model for the fixed-pitch wind turbine,...
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....
This paper investigates a new direct torque control (DTC) strategy for induction machine based on particle swarm optimization (PSO). The PSO was used to adjust the parameters (Kp, Ki, Kd) of PID controller. The scheme improves the adjustive capability of PID controller. The new direct torque controlled strategy is considered in detail and it is shown that the use of PSO-PID controller decrease the...
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...
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