Basic research on the hottest hybrid magnetic circ

Basic research on hybrid magnetic circuit multilaterally coupled motor

Chinese Library Classification Number: tm383.6 document identification code: a

article number: (2000) functional research on hybrid-mechanical-circuit

multi-couple electric machine Cheng Shu Kang, Zheng Ping, Cui Shu Mei, Song Li Wei, Li Li Yi

(Harbin Institute of technology, Harbin 150001, China)a) abstract:in PM inductor electric machine, because of the influence of the space between laminations, the air-gap magnetic field produced by the axially magnetized permanent magnet is very uneven along axial direction, which limits the torque per iron core length and volume to performance ratio. The paper puts forward a hybrid-magnetic-circuit multi-couple electric machine that compensates for the uneven air-gap magnetic field of the hybrid stepping motor. Analysis and experiment show that the static torque of hybrid-magnetic-circuit multi-couple electric machine is much higher than that of the hybrid stepping motor of the same volume.

KEY WORDS：hybrid-magnetic-circuit； multi-couple； Electric machine1 introduction with the great improvement of the performance price ratio of permanent magnet materials, permanent magnet motors have developed rapidly in recent years. Taking permanent magnet inductor motor (HB motor) as an example, it has developed from control element to power drive element, and has been gradually applied in practice. Research shows that in Hb motor, due to the influence of axial equivalent air gap in laminated iron core, the axial magnetic density distribution of the motor is very uneven [1], which restricts the output (power or torque) per unit iron core length. This influence has become a problem that must be solved for power components. The usual method is to limit the length of each section of iron core, adopt multi-section structure, or adopt other methods to minimize its impact [2]. However, the attenuation of axial magnetic density is not compensated, which is not conducive to improving the performance volume (or weight) ratio of the motor

this paper presents a solution to the fault of hybrid magnetic circuit multi impact testing machine, the scheme of side coupling motor. Analytical analysis and experimental research show that good results can be achieved. 2 motor structure and model hybrid magnetic circuit multi coupling motor is to configure a set of axial excitation coils on the basis of hybrid stepping motor structure, so that the air gap magnetic field generated by the axial excitation coil can compensate the air gap magnetic field generated by the permanent magnet. "Mixed magnetic circuit" refers to both the radial magnetic field generated by the radial excitation winding and the axial magnetic field generated by the axially magnetized permanent magnet and the axial excitation coil in the motor. The motor works by the interaction of the radial magnetic field and the axial magnetic field; "Multilateral coupling" means that there are three magnetic potential sources in the motor: radial excitation winding, axial magnetization permanent magnet and axial excitation coil, which are coupled to each other to determine the parameters and performance of the motor. The motor can be either an inner rotor structure or an outer rotor structure

figures 1 to 4 are several structural diagrams of this motor

Figure 1 shows the outer rotor structure, with radial excitation winding, axial excitation coil and axial magnetized permanent magnet all configured on the stator. Figure 2 also shows the outer rotor structure. The radial excitation winding and axial excitation coil are configured on the stator, and the axial magnetized permanent magnet is configured on the rotor. Figure 3 shows the inner rotor structure. The radial excitation winding, axial excitation coil and axial magnetized permanent magnet are all configured on the stator. Figure 4 also shows the inner rotor structure. The radial excitation winding and axial excitation coil are configured on the stator, and the axial magnetized permanent magnet is configured on the rotor. In comparison, this kind of motor has greater advantages as an external rotor structure, especially for high-power and disc motors. Take the structure shown in Figure 1 as an example to analyze the three-phase motor. There are 3N (n is an integer) stator poles on the stator of three-phase motor, which belong to a, B durometer precautions and C three-phase respectively. Because the relative position relationship between the N poles of each phase and the rotor is the same, one stator pole can be taken for analysis per phase, and the two iron cores of the motor are represented by a and B respectively. During the analysis, the following assumptions are made for the motor:

(1) permeability of the iron core μ Fe ＝∞；

(2) hysteresis and eddy current effects are not considered

(3) ignore the magnetic leakage of radial excitation winding

(4) the air gap permeance under the stator pole only considers its constant component and fundamental component

1/n motor is shown in Figure 5. Figure 1 one of the outer rotor structure figure 1 one of the "siochi pointed out that the outer rotor structure figure 2 two of the outer rotor structure figure 2 another outer rotor s is one of the inner rotor structure figure 3 one of the inner rotor structure figure 4 inner rotor structure figure 2

Fig.4 another inner rotor structure