22 11 2018 11 Electri c Machines and Control Vol. 22 No. 11 Nov. 2018 110870 DOI10. 15938 /j. emc. 2018. 11. 010 TM 331 A 1007-449X201811-0075- 07 Control strategy of axial coil assisted reluctance doubly salient motor LIU Ai-minLOU Jia-chuanSUN Peng School of Electrical Engineering Shenyang University of Technology Shenyang 110870 China AbstractAn axial coil assisted reluctance doubly salient motor was designed for the problem that the permanent magnet might demagnetize and could not be magnetized under high temperature and high pressure in permanent magnet DC motor. According to the principle of the double salient motor based on the special structure and inductance model of the motor a three phase six-state angle conduction mode was put forward on the basis of the standard angle conduction mode. An excitation current-torque direct control strategy based on the central excitation coil with a two-group power inverter module was proposed. By controlling the excitation current at the commutation moment to realize the adaptive adjustment of the excitation current the torque control was achieved. Ultimately the feasibility and effectiveness of the control method making the motor run more smoothly are verified by the field-circuit coupled analysis and experiments. Keywordscoil assisted reluctancethree phase-six statetorque rippleexcitation coilexcitation current-torque direct control 2017-05 - 14 51777131 1961 1987 1993
76 22 0 CARDSM 3 1 CARDSM 1. 1 CARDSM 9 /6 1 CARDSM 1 1 2 3-5 6-8 CARDSM 9 10 11-12 13 axial coil assisted reluctance doubly salient motor CARDSM CARDSM 1 CARDSM Fig. 1 Structure scheme of the CARDSM 1. 2 CARDSM CARDSM u p = R p i p + dψ pr + ψ pe 1 dt u p R p i p ψ pr ψ pe
11 77 i W co θ i= T p = T pr + T pe = 1 2 i2 p ψθ idi θ = const. 2 dl p dθ ± i pi f dl pf dθ 4 100 V 8 A 0 Tθ i= W 3 V7 coθ i 3 V10 V8 V9 θ i = const. CARDSM T p T pr T pe i f L p L pf 14 3 Fig. 3 Structure of control system CARDSM 1 2 1 Table 1 Standard angle conduction law IGBT 2 16 V1 V2 A 22 36 V3 V4 B 42 56 V5 V6 C 2 Fig. 2 Curved surface of self-inductance 2 CARDSM 0 θ off = 1 2π - β 2 ( r ) + θ u 5 2. 1 CARDSM θ on = 2 θ off 3 16 14 4 N r N r β r θ u = 6= 30 θ u = θ on = 0 N r β r θ off = 15 30
78 22 Fig. 4 4 Current waveform of winding 2 Table 2 2 Three phase six-state angle conduction law IGBT 2 6 V1 V2 V5 V6 A C 6 14 V1 V2 A 22 26 V1 V2 V3 V4 A B 26 34 V3 V4 B 5 Fig. 5 Different angle control mode 42 46 V3 V4 V5 V6 B C 46 54 V5 V6 C 2 A 2 C 22 2 6 A C C 4 5 CARDSM 2 6 2 P A P B P C Fig. 6 Torque comparison of two control methods L a L b L c 2. 2 CARDSM A 2 B A 0A CARDSM 22 A 4 C - 200 V 6 7 1 A 3 A 5 A
11 79 0. 3 N m 0. 3 N m 8 0. 7 N m 0. 4 N m 1 A 3 A 5 A 9 Fig. 9 Excitation current-torque direct control in standard angle conduction law 7 Fig. 7 Self inductance curve with different currents Fig. 8 10 8 Fig. 10 Excitation current-torque direct control in three Mutual inductance curve with different currents phase six-state angle conduction law 3 11 TMS320F28335DSP 3 ECAP P A P B P C PWM1 ~ PWM6 A /D 4 EQEP 9 10 IGBT DSP
80 22 11 Fig. 11 Testing platform 14 200 V Fig. 14 Speed adding excitation current at 200 V 100 V 12 15 150 V Fig. 15 Speed of adding excitation current at 150 V Fig. 12 12 Voltage and current curve 13 14 15 CARDSM 16 CARDSM 16 Fig. 16 Starting speed at different voltages 4 CARDSM 13 250 V CARDSM Fig. 13 Speed of adding excitation current at 250 V
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