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The paper reports unexpected failures of ultrahigh speed induction machine (USIM) supplied by PWM converter applied in a system developed for utilizing renewable and waste energies. Due to the high supply frequency of USIM the frequency ratio in the PWM converter was unusually low. The imperfect operation of the microcontroller commanding the PWM pattern generated subharmonics. It developed considerable...
An nonlinear simulation model of the Switched Reluctance machine with the operation at four-quadrant founded on MATLAB is presented. The simulation of the prototype with three given rotor speeds and four different loads are made. The simulated results on the rotor speed curves, the rotor speed ascending time and the phase current waveforms are given. It is shown that the operation of the Switched...
The following topics are dealt with: speed control; back-EMF; permanent magnet synchronous machines; sensorless machine control; field-oriented control; brushless dc motors; PMSM; differential magnetic anisotropy; current control; voltage source inverter; rotor; position estimation; IPM motor drives; PWM current harmonics; torque control; reluctance machines; extended Kalman filter; induction motors...
The effect of inverter supply on the eddy-current losses in the laminated core of a synchronous machine is studied. A 2D finite element model including a dynamic model for the eddy currents in the core laminations is applied to predict the machine losses by numerical simulations. A synchronous extruder motor is simulated both with sinusoidal and pulse-width modulated voltage supplies in different...
Dual mechanical port machine (DMP) - a kind of continuous electrical variable transmission, is a very competitive alternative for vulnerable constant speed-ratio mechanical gearbox in high capacity wind power generation system. As the inner rotor is surrounded by the stator and the outer rotor, the DMP machine suffers from PM demagnetization and insulation failure under severe thermal condition. To...
Present paper describes the design of a doubly fed induction generator (DFIG) test bench with active crowbar, using a PWM voltage-fed inverters connected between the grid and the rotor. A vector control scheme is proposed in order to control the power-side and the rotor- side of the converter. A control board, based on a digital signal processor (DSP) and a FPGA, has been developed to manage the overall...
In order to bridge the relational gap existing between control algorithm, driving circuit, rotor and bearing, a numerical algorithm for micro mechatronics simulation is developed for HDD spindle motors. The influences of PWM modes and driving circuit parameters on startup characteristics are investigated to demonstrate the importance of the proposed method.
In this paper, stator-flux orientation control strategy for the flux-switching permanent magnet (FSPM) motor under two pulse width modulation (PWM) generation modes, namely current hysteresis and voltage space vector, is investigated and implemented. Firstly, the definition of d- and q-axes for the FSPM motor, which is crucial to the mathematic model and control strategy, is highlighted. The fundamental...
This paper presents the utilization of sensorless position control technology by PWM high-frequency injection for SynRM, one possible structure of SynRM applied to sensorless control and two different winding connections of SynRM as well as experimental test and FEA of phase inductance. The theoretical analysis indicates obvious influence of phase inductance wave on position signal estimation when...
The application of the slide-mode observer in the sensorless vector-control of permanent magnet synchronous motor (PMSM) is proposed. Design a slide-mode observer to estimate the information of rotor position. Establish the adaptive rule and analysis the stability of the slide-mode observer. The application of the space vector pulse width modulation (SVPWM) is introduced in the control scheme of the...
Accurate prediction of iron losses in electrical machines requires detailed information of flux density waveforms in the iron. In the case of an induction machine operating at partial load, many supply cycles must be modeled to obtain accurate flux density waveforms on the rotor. This may be particularly troublesome when nonsinusoidal supplies are used and many small time steps are required. This...
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