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This paper presents a novel rotor structure of interior permanent magnet synchronous motor (IPMSM) using rare earth and ferrite magnets for some concerns about future supplies of materials. In this IPMSM, the total volume of Nd-Fe-B magnets can be reduced by 58 % compared with a basic IPMSM model. We analyzed motor characteristics such as the torque, efficiency, stress in the rotor, and demagnetization...
This paper presents a study on performance optimization for switched reluctance motor (SRM) designed for commuter-type electric vehicle. We designed and analyzed a model. We calculated the output limit and verified the power supply voltage is capable of causing current to flow when the motor is driven at maximum speed.
This paper proposes the rotor structure of Interior Permanent Magnet Synchronous Motor (IPMSM) using ferrite magnets that can improve the total torque. Three kinds of motor models including the basic motor model are shown, and the torque performance and the demagnetization of the magnet are discussed for each motor model. A two-dimensional finite element method is introduced to mainly analyze torque...
This paper describes torque characteristics of the interior permanent magnet synchronous motor (IPMSM) using the inexpensive ferrite magnets. IPMSM model used in this study has the spoke and the axial type magnets in the rotor, and torque characteristics are analyzed by the three-dimensional finite element method (3D-FEM). As a result, torque characteristics can be improved by using both the spoke...
This paper discusses improvement of common-mode voltage elimination ability of a PWM inverter with an auxiliary inverter. The main inverter and the small capacity auxiliary inverter are connected at the neutral point of the LC filter. The auxiliary inverter compensates common-mode voltages of the main inverter. Additionally, because the auxiliary inverter does not output active power, the capacity...
This paper proposes an estimation method of the rotor position without a lot of calculation and additional hardware for Switched Reluctance Motor (SRM). This method uses the phase inductances varying regularly with the rotor position, and the rotor position is estimated using the approximate equation expressed by Fourier series of phase inductances. The phase inductance is obtained using the current...
This paper discusses the arrangement of the flux barriers in the stator of the outer rotor type IPMSM. IPMSM usually has the flux barriers for preventing the short circuit of magnetic flux near the permanent magnet. However, the flux barriers are used in the stator to improve the efficiency in this study. A two-dimensional finite element method (2D-FEM) is introduced to analyze the various modified...
This paper presents position sensor-less control of low-inductance and high-speed permanent magnet synchronous motor (PMSM) drives. The proposed method estimates flux from a reduced order observer and estimates pole position with estimated flux. For low-inductance PMSM, current detection is difficult, because the current varies rapidly. Therefore, pole position estimation with the measured current...
A method for reducing the vibration and acoustic noise of switched reluctance motors is proposed. The dominant source of the vibration and acoustic noise is the rapid change of the radial force during the commutation, and it is caused by a rapid change of current. When the excitation current is cut off, the radial force suddenly reduces to zero. If the current is not zero during the commutation, the...
This paper describes driving characteristics of the electric vehicle (EV) operated by the position sensorless controlled switched reluctance motor (SRM). Assuming the phase inductance waveform to be a sinusoidal one, the space vector of the phase inductance in the SRM can be defined, and the rotor position can be obtained from the phase angle of this space vector. Starting, low speed driving, and...
This paper proposes an estimation method of rotor position for 3-phase switched reluctance motor (SRM) based on the complex plane expression. The rotor position can be estimated simply without magnetic characteristics of the motor and additional hardware. The phase inductances are approximated by the Fourier series and the rotor position is estimated using the complex plane expression of them. At...
This paper presents a dual-bridge inverter approach to eliminate the motor common-mode voltage. This inverter which consists of two inverters to be connected in parallel does not generate the common-mode voltage, and can drive standard three-phase three-wire induction motors. Additionally, because one inverter does not output active power, the capacity of the inverter is very small. The effectiveness...
This paper describes a new position sensorless control method of 3-phase SRM based on the complex plane expression of phase inductance. The rotor position is simply obtained without magnetic characteristics of the motor and additional hardware. In this method, assuming the phase inductance waveform to be sine wave, the rotor position is obtained by computing the angle of the space vector of inductance...
This paper presents high frequency region position sensor-less vector control of permanent magnet synchronous motor (PMSM) drives. The proposed method enables to estimate pole position at high speed and reduce harmonic current. The proposed method estimates flux from a full order observer and estimates pole position with estimated flux. To improve the current waveforms inductances are added to the...
This paper presents the experimental test results of the independent vector control characteristics of two three-phase induction motors (IMs) and two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (FLI). To drive two motors (IMs or PMSMs) independently, the system connected one motor to one three-phase voltage source inverter (three-VSI) is generally used and is...
This paper presents the novel pulse width modulation (PWM) technique with switching-loss reduction for a five-leg inverter (FLI). As the PWM strategy for the FLI, the PWM technique that available maximum voltage for two motors adds up to a DC-bus voltage has been proposed. Therefore, the DC-bus voltage can be fully available in this PWM strategy. However, this conventional PWM technique requires the...
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