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Iron losses generated in PM motors can be estimated by the coupling analysis system between magnetic filed simulator and control simulator. As a result, the eddy current losses in magnets in the benchmark motor with PWM driving become more than 10 times of the result with sinusoidal current.
This paper proposes a novel doubly salient machine. The topology of the machine is described. The flux within the air gap of the novel doubly salient machine is excited by both permanent magnets and field coils. The current of the field coils can be regulated to strengthen or weaken the flux level in the air gap. Therefore, the output voltage of the machine can be controlled easily. The method of...
Normal force in single-sided linear induction motor (SLIM) is normally restrained in SLIM transportation system. We developed a combined levitation-and-propulsion device to utilize the normal force for levitation and thrust for propulsion with only a SLIM in our Lab. This paper describes a mathematic model for the analysis of normal -and- thrust forces through a space high harmonic method. A scheme...
To increase the output dynamic response and decrease the stable ripple of VRM, With multi-core combination, a split-phase coupling array integration inductance (short for SCAII) is applied in the four-phase VRM. Without considering the impact of leakage magnetic flux, the effect of SCAIIpsilas parameters is analyzed on the performance of VRM. The SCAIIpsilas complanation structure, is given and using...
The active and reactive components of the power winding current were controlled by the control winding current, which could make power winding current only providing active current component, and the power winding supplying the dynamic torque. The exciting field for the power winding was completely provided by the control winding. On the basis of dq-rotating reference frame of brushless doubly-fed...
Switched reluctance motors are often running in status of two phases excited simultaneously. Mutual coupling has effects on not only the flux distribution and magnetic saturation, but also the ability of torque output. The two adjacent phases of switched reluctance motor can be excited in two modes, the long-flux-path mode and short-flux-path mode. The calculation method of mutual inductance in two-phase...
This paper investigates and compares the inductance evaluation methods for interior permanent magnet synchronous motors (IPMSM). Three major finite element methods will be discussed. First, their detail calculation processes are presented as well as their fundamental principles. Not only the results, but also their solving method, computation time and complexity are compared. Then, the discussion...
Accurate information of rotor permanent magnet field is needed in permanent magnet synchronous motor(PMSM) control, but this information is variable under demagnetization conditions, such as high temperature or peak current. Nonsinusoidal flux density distribution caused by demagnetization induces to torque ripple, which degrades the PMSM drive performance. To estimate flux magnitude, a Kalman filter...
Generally, a back electro-motive-force or flux observer is used for position sensorless drive of permanent magnet synchronous motors from middle to high speed range. Thus, the estimation accuracy of the observer influences position sensorless drive performance. This paper proposes a position sensorless drive system using the Hinfin flux observer in which the observer gain is designed by using the...
A sensorlesss vector control system of PMSM compressor is presented in this paper. By calculating the magnetic flux linkage, the position of magnetic pole and the speed of the compressor are estimated. To realize the low cost sensorless control, an 8-bit high performance microcontroller-XC886 is used. Phase currents measurement based on shunt resistors in lower legs is adopted to simplify the circuit...
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