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The parallel three-phase voltage source inverters have been widely used to raise system power rating. However, the zero-sequence circulating current can be generated according to switching method in the direct connection scheme. Zero-sequence circulating current not only distorts current but also reduces system reliability and efficiency. In this paper, model predictive control scheme is proposed...
This paper proposes a Double-stator Flux Switched permanent magnet motor (DS-FSM) adopting stator-partitioned structure with double air gaps. The DS-FSM is designed and verified by finite element analysis (FEA). Compared with a conventional flux-switching machine using rare earth PMs and a single air gap, the proposed motor demonstrates higher torque density. The designed motors are then comprehensively...
Conventional single phase permanent magnet (PM) brushless DC motors (BLDC) are used in low power consumption applications, which require relatively small torque, such as fans and pumps [1].
The sliding mode control technique applied to the drive control is analyzed in terms of dynamic response and energy saving in a stand-alone network. The drive is equipped with a surface-mounted permanent magnet synchronous motor fed by renewable power through a voltage-source inverter. The design of sliding mode control is presented and it is shown that the developed control eliminates the influence...
The non-ideal factors of permanent magnet synchronous motor (PMSM) drive system, such as harmonics of rotor flux, cogging torque, and voltage source inverter (VSI) nonlinearity cause the speed ripple and deteriorate the speed and current regulation performance. To suppress these disturbances, this paper proposes a novel cascaded robust current and speed control stragety for PMSM. The proposed method...
This paper presents a method for improving the performance of brushless direct current motor drive. This method depends on the varying of switch-on angle of motor phase current. The phase current and torque for the proposed method are discussed. The operation of brushless direct current motor drive at different switch-on angle for the same speed is studied and discussed. The results of this study...
Flux switching machines (FSMs) have been created to describe machine in which the stator tooth flux switches its polarity by following the motion of a salient pole rotor. In general, FSMs can be classified into three group clusters that are field excitation (FE) flux switching motor, permanent magnet (PM) flux switching motor and hybrid excitation (HE) flux switching motor. The main flux sources for...
This paper proposes that direct torque control of interior permanent magnet synchronous motors (IPMSM) using a sliding mode observer (SMO). The sigmoid function is used to decrease the chattering as the switching model. This function is more effective than the unit step function to decrease the chattering. The back-EMF component of the motor is observed for robust sensorless control. The rotor position...
Research and development on flux switching machines (FSMs) getting popular due to their several definite advantages of high torque and power densities, constant power over a wide speed range, higher efficiency and robust rotor structure inherits combined advantages of permanent magnet synchronous motor (PMSM) and switched-reluctance motor (SRM). There are many developed and novel design of FSMs for...
A control scheme based on the singular perturbations methodology and the sliding mode technique is designed for a permanent magnet (PM) stepper motor. The control scheme designed allows the angular velocity and position of the motor to track some given reference trajectories and it is based on the reconstruction of those signals from direct measurements of the stator currents and stator voltages....
Most of commercial Hybrid Electric Vehicle (HEV)used single motor and transmission gears coupled to the wheels. This system leads to the transmission losses and reduce the efficiency and reliability of the motor. Therefore, in-wheel direct drive mechanism is introduced to overcome this problem. In-wheel direct drive eliminates the mechanical transmission, differential gears and drive belts. Thus,...
This paper deals with the analytical description of an interior permanent magnet synchronous motor running in six-step conduction mode. It assumes a non-sinusoidal back emf, but inductances vary sinusoidally with the rotor position. The proposed model renounces Park's transformation and delivers a set of equations which allow the numerical simulation of phase currents and torque in the abc reference...
This paper proposes a method of detecting speed for the permanent magnet synchronous motor (PMSM) without speed sensors on the base of model reference adaptive system (MRAS) combining with variable structure control. Moreover, to weaken the chattering phenomenon coming from the signum function, a sigmoid function is utilized and an adaptive gain is designed. Meanwhile, a speed regulator is designed...
This paper proposes a new rotor position estimating method by detecting the stator currents under each PWM switching state for an interior permanent magnet synchronous motor drive system. The proposed sensorless drive system can be applied in an air conditioner without injecting any high-frequency sinusoidal or cosine voltage signal. The operating speed range can be effectively extended because the...
Different methods have been proposed for torque ripple control in Switch Reluctance motor (SRM). In order to overcome this problem, some of the methods are based on changing in the structure and the geometry of the motor and others are performed by using control methods. This paper describes the structure and principles of operation in SRM and then introduces some controlling methods for these motors...
This paper proposes a novel smooth transition method, which can be applied to back electromotive force (BEMF)-based permanent magnet synchronous motors (PMSM) sensorless vector control drive. The problem with BEMF-based sensorless control of PMSM control is the inherent BEMF estimation precision before reaching a certain rotation velocity. A position open loop constant current (I-F) method, which...
A new position sensorless method is proposed for surface permanent magnet synchronous motors in all speed regions. In this method, two sensorless methods are switched in accordance with the rotating speed. In low speed regions, an Induced Voltage caused by a Magnetic Saturation (IVMS) based method is used. This method is switched to a back EMF based sinusoidal current method at a medium or high speed...
A new structure of field excitation flux switching motor (FEFSM) as an alternative candidate of non-Permanent Magnet (PM) machine for HEV drives is presented in this paper. Design principles and initial performances of the proposed motor at various rotor pole numbers with 12 stator slots are demonstrated. Initially, the coil arrangement tests are examined to validate the operating principle of the...
This paper presents a comparative study between field oriented control (FOC) and direct torque control (DTC), two most popular control strategies for inverter fed interior permanent magnet synchronous motor (IPMSM) drives. The comparison is done in four switch three phase (FSTP) inverter scheme instead of six switch three phase (SSTP) inverter scheme. The FSTP inverter scheme is better than SSTP inverter...
In this paper, we discuss a position sensorless drive for an axial structure motor without rare-earth metals in a low-speed region. Since this motor has no saliency, a conventional position sensorless drive using harmonic injection cannot be applied. Therefore, we apply a position sensorless drive based on Induced Voltage caused by Magnetic Saturation (IVMS) to this motor. As IVMS becomes very small...
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