Design and Research of Novel Variable Flux Memory Motor with Series Hybrid Magnets

Design and Analysis of Wide Speed Regulation of Variable Leakage Flux Reverse Salient-Pole Motor

“…In [8]- [10], a hybrid excitation motor is proposed, which can flexibly adjust the PM magnetic field by changing the amplitude and current angle of the added excitation current, thereby expanding the speed regulation range. In [11], [12], scholars have proposed the memory motor, which mainly degaussed and demagnetized PM by injecting pulse current for a short time, thus realizing flux control and achieving high efficiency and wide speed range. The pulse current regulating the magnetization state of PM is generated by the DC magnetization coil [13], which is more convenient to control the magnetization state.…”

Investigation of a Novel Consequent-Pole Flux-Intensifying Memory Machine

“…In order to address the problem of unchangeable air-gap flux density, a variable flux memory machine (VFMM) [6][7][8][9][10][11][12][13][14] was proposed and has become a hot research focus. Memory machines utilize low coercive force (LCF) magnets such as AlNiCo, and the magnetization state (MS) can be flexibly adjusted with different transient current pulses with negligible loss.…”

“…Therefore, VFMM can achieve high efficiency over a wide speed range. The existing VFMMs are divided into DC- [6][7][8] and AC- [9][10][11][12][13][14] magnetized types according to the winding category to provide current pulses. The DC-magnetized VFMMs [6][7][8] usually have LCF magnets on the stator side, and the additional magnetization coils can provide MS manipulation currents conveniently.…”

“…However, DC-magnetized VFMMs generally suffer from a complicated structure. On the other hand, AC-excited VFMMs [9][10][11][12][13][14][15][16] utilize d-axis current pulses generated by the armature windings to manipulate the MS of LCF magnets, which feature a simple configuration with magnets on the rotor side.…”