scholarly journals A compare research on third harmonic current control for five-phase permanent magnet synchronous motor

2021 ◽  
Vol 39 (4) ◽  
pp. 865-875
Author(s):  
Tianxing Li ◽  
Ruiqing Ma ◽  
Hao Bai ◽  
Ping Fan ◽  
Yuchen Zhang
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Reference Value ◽  
Synchronous Motor ◽  
Electromagnetic Torque ◽  
Harmonic Current ◽  
Third Harmonic ◽  
The Third ◽  
Current Reference ◽  
Maximum Current

The injection of a third harmonic current can improve the electromagnetic torque output of the five-phase permanent magnet synchronous motor. In this paper, constant copper consumption and constant maximum current are used as constraints, and the influence of the ratio between the third harmonic current and the fundamental current on the electromagnetic torque under the two constraints is analyzed. The electromagnetic torque is the largest when the third harmonic current reference value is equal to the fundamental current reference value of ψf3/ψf times under the premise of the constant copper loss. On the premise that the maximum current is constant, the electromagnetic torque is the largest when the third harmonic current reference value is equal to the fundamental current reference value of kw/(6kw-kw3/3) times. On this basis, according to the vector amplitude, phase and action time, the changing trends of maximum voltage utilization rate with Vref3/Vref1 under three different kinds of methods are given. Finally, through the experimental platform, the control effects of the three kinds of SVPWM are compared under two constraint conditions.

scholarly journals Analysis of Model Predictive Current-Controlled Permanent Magnet Synchronous Motor Drives with Inaccurate DC Bus Voltage Measurement

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 353 ◽  
Author(s):  
Wei Wang ◽  
Zhixiang Lu
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Reference Value ◽  
Synchronous Motor ◽  
Motor Drives ◽  
Voltage Measurement ◽  
Variation Range ◽  
Torque Capacity ◽  
Dc Bus ◽  
Bus Voltage

In this paper, the effects of inaccurate DC bus voltage measurement are analyzed to model predictive current-controlled permanent magnet synchronous motor (PMSM) drives. It is found that the selection of the optimal space vector is affected by inaccurate DC bus voltage measurements, and the shortest distance principle is proposed to evaluate the effects. With the under-voltage measurement, the actual q axis current is always larger than the reference value, and PMSM may be damaged by the over-current phenomenon. However, the actual q axis current is always smaller than the reference value with the over-voltage measurement, and the rated torque capacity cannot be properly used. The effects of the over-voltage measurement are more serious than those of the under-voltage measurement. Additionally, the larger DC bus voltage measurement error can result in more serious effects than with the over-voltage measurement. Considering the limited variation range of the actual DC bus voltage, the rated value can be set as the measured value and the effects can be neglected. However, the effects should be taken into account if the variation range of the actual DC bus voltage is large. All the theoretical analyses are verified by experimental results.

scholarly journals Ferrites and Different Winding Types in Permanent Magnet Synchronous Motor

2012 ◽  
Vol 63 (3) ◽  
pp. 162-170 ◽  
Author(s):  
Peter Sekerák ◽  
Valéria Hrabovcová ◽  
Juha Pyrhönen ◽  
Lukáš Kalamen ◽  
Pavol Rafajdus ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Power ◽  
Low Cost ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Synchronous Machines ◽  
Stator Winding ◽  
Permanent Magnet Synchronous Machines ◽  
The Third ◽  
Slot Opening

Ferrites and Different Winding Types in Permanent Magnet Synchronous MotorThis paper deals with design of permanent magnet synchronous machines with ferrites. The ferrites became popular due to their low cost and cost increasing of NdFeB. The progress in ferrite properties in the last decade allows the use of ferrites in high power applications. Three models of ferrite motors are presented. It is shown that also the type of stator winding and the shape of the slot opening have an important effect on the PMSM properties. The first motor has a distributed winding, the second motor has concentrated, non-overlapping winding and open stator slots. The third motor has a concentrated non-overlapping winding and semi - open slots. All models are designed for the same output power and they do not have the same dimensions. The paper shows how important the design of an electric machine is for excellent motor properties or better to say how the motor properties can be improved by an appropriate design.

scholarly journals Iterative sliding mode observer for sensorless control of five-phase permanent magnet synchronous motor

2017 ◽  
Vol 65 (6) ◽  
pp. 845-857
Author(s):  
J. Yang ◽  
M. Dou ◽  
D. Zhao
Keyword(s):  
Permanent Magnet ◽  
Sliding Mode ◽  
Sensorless Control ◽  
Permanent Magnet Synchronous Motor ◽  
Sliding Mode Observer ◽  
Motor Speed ◽  
Third Harmonic ◽  
Rotor Position ◽  
The Third ◽  
Three Phase

AbstractDue to the star connection of the windings, the impact of the third harmonic which does not exist in three-phase permanent magnet synchronous motor (PMSM) cannot be ignored in five-phase PMSM. So the conventional sensorless control methods for three-phase PMSM cannot be applied for five-phase PMSM directly. To achieve the sensorless control for five-phase PMSM, an iterative sliding mode observer (ISMO) is proposed with the consideration of the third harmonic impact. First, a sliding mode observer (SMO) is designed based on the fivephase PMSM model with the third harmonic to reduce the chattering and obtain the equivalent signal of the back electromotive force (EMF). Then, an adaptive back EMF observer is built to estimate the motor speed and rotor position, which eliminates the low-pass filter and phase compensation module and improves the estimation accuracy. Meanwhile, by iteratively using the SMO in one current sampling period to adjust the sliding mode gains, the sliding mode chattering and estimation errors of motor speed and rotor position are further reduced. Besides, the stability of the SMO and the adaptive back EMF observer are demonstrated in detail by Lyapunov stability criteria. Experiment results verify the effectiveness of the proposed observer for sensorless control of five-phase PMSM.

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