Multi-phase Inverter-fed MATRIX Motor for High Efficiency Driving

2022

IEEE Access

This paper describes a high-efficiency drive method of an adjustable field Interior Permanent Magnet Synchronous Motor (IPMSM) utilizing magnetic saturation. The adjustable field IPMSM can control the magnetic field flux using magnetic saturation caused by a modulation current. In general, it is said that motor efficiency is high at operating points where the copper loss and the iron loss are balanced. However, the high-efficiency drive range of a conventional PMSM is narrow because the magnetic field of the PMSM is constant. On the other hand, it is possible in the proposed adjustable field IPMSM to expand the highefficiency drive range because the field amount can freely be adjusted by the modulation current. Therefore, this paper examines an optimal modulation current for a high-efficiency operation. To derive the optimal modulation current, losses and efficiency of the proposed adjustable field IPMSM are formulated based on the measured motor parameters. In addition, it is confirmed from several experimental tests that the highefficiency driving range can be expanded due to the optimal modulation current.

Section: Solve For Iqmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Efficiency Drive Method of Adjustable Field IPMSM Utilizing Magnetic Saturation

2022

IEEE Access

“…The adjustable field method described in [11] utilizes the space harmonics as magnetic field energy by using special windings and rectifier circuits in the rotor. Another adjustable field method switches over the winding configurations as reported in [12]. The adjustable field method can change the number of flux linkage discretely by switching over the winding configurations such as a three-phase or a six-phase drive.…”

Section: Introductionmentioning

confidence: 99%

Three-Phase Inverter Fed Adjustable Field IPMSM Drive Utilizing Zero-Sequence Current

IEEE Trans. Ind. Electron.

2023

This article proposes a three-phase four-wire inverter drive system for an adjustable field interior permanent magnet synchronous motor utilizing magnetic saturation. The magnetic saturation is regarded as a phenomenon of a decrease in permeability depending on an extra magnetic field. In the proposed motor, the number of flux linkage can be controlled by modulating the permeability of magnetic leakage paths in the rotor. However, the proposed adjustable field method requires an additional magnetomotive force (m.m.f.) to control the permeability. Therefore, a zero-sequence current i z fed by the three-phase four-wire inverter is utilized as the additional m.m.f. source. Thereby, the field control can be achieved with a simple three-phase inverter without sacrificing the number of switching devices compared with conventional motor drives. In the article, the control algorithm of the three-phase four-wire inverter is discussed, and its usefulness is verified by comparing the proposed drive system with other methods or systems.

“…To solve this problem, in previous studies, an adjustable field PMSM that can control the PM-based magnetic field has been attracting attention in recent years [5][6][7][8][9][10][11]. The adjustable field PMSM introduced in the references [5,6] can control the magnetic field density on the rotor surface with a consequent pole structure by using a field winding.…”

Section: Introductionmentioning

confidence: 99%

“…The adjustable field method proposed in the reference [9] can make an expansive driving range possible, because this method can change the drive circuits that correspond to three-phase or six-phase windings, etc. However, multiple six single-phase inverters are indispensable to switch over the winding configurations.…”

Section: Introductionmentioning

confidence: 99%

Operation Characteristics of Adjustable Field IPMSM Utilizing Magnetic Saturation

2021

Energies

This paper describes an interior permanent magnet synchronous motor (IPMSM) based on a new adjustable field method. The proposed PM motor achieved magnetic field control utilizing magnetic saturation. In this paper, a back electromotive force (e.m.f.) measurement test and a load test using the prototype motor were conducted to clarify if the proposed motor had a wide operation range. In the back e.m.f. measurement test, it was confirmed that the proposed motor had a wide magnetic field controllable range of 51.7%. In addition, it was revealed, through the load test, that the proposed motor had a wide operating range, including both low-speed high-torque and high-speed low-torque driving conditions. Moreover, based on electromagnetic field analysis, the magnetic field control performance of the proposed adjustable field method was compared with the conventional field weakening control and other adjustable field methods. As a comparison result, it was verified that the proposed motor had less copper loss for the magnetic field control and fewer losses in the high-speed operating range.