One-phase open-circuit fault-tolerant direct thrust control method for five-phase permanent magnet linear motor
A permanent magnet linear motor, thrust control technology, applied in the direction of linear motor control, motor control, direct torque control, etc., can solve the problem of unequal output phase current amplitude, disordered inverter switching frequency, thrust/torque pulsation It can improve the sine degree, increase the complexity, and reduce the iron loss.
A permanent magnet linear motor, thrust control technology, applied in the direction of linear motor control, motor control, direct torque control, etc., can solve the problem of unequal output phase current amplitude, disordered inverter switching frequency, thrust/torque pulsation It can improve the sine degree, increase the complexity, and reduce the iron loss.
CN108306571AInactive Publication Date: 2018-07-20JIANGSU UNIV
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[0042] In order to more simply and clearly illustrate the characteristics and beneficial effects of the fault-tolerant direct thrust control strategy of the five-phase permanent magnet linear motor of the present invention, a specific five-phase permanent magnet fault-tolerant linear motor will be described in detail and completely below.
[0043] Such as figure 1 As shown, the structure schematic diagram of the five-phase permanent magnet fault-tolerant cylindrical linear motor of the embodiment of the present invention, the winding of the motor is placed on the stator; the permanent magnet is located on the mover, and each permanent magnet is isolated by a magnetic material, and installed in the form of a spoke On the mover, it can generate large thrust and small positioning force; the fractional slot single-layer concentrated winding is adopted, and the winding coil is located on both sides of the armature teeth, which improves the sinusoidal degree of the back EMF and impro...
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The invention discloses a one-phase open-circuit fault-tolerant direct thrust control method for a five-phase permanent magnet linear motor. Firstly, a Clark transform matrix and an inverse matrix thereof are derived based on fault-tolerant phase current. On the above basis, a stator flux linkage on alpha-beta is derived, a stator virtual flux linkage is defined according to the requirements of acircular stator flux linkage trajectory, and thus the voltage compensation on alpha-beta is derived. The stator actual voltage on the alpha-beta is derived by a modulation function of a voltage sourceinverter, and voltage is combined with voltage compensation and stator current, and a stator virtual flux linkage and thrust are observed by a stator flux observer and a thrust observer. Then statorvirtual target votlage is calculated according to given thrust, a given stator flux linkage amplitude and the observed stator virtual flux linkage and thrust. Finally, the stator actual voltage is calculated by the voltage and the voltage compensation, and the motor is controlled by the voltage by the voltage source inverter. According to the method, a thrust fluctuation caused by a motor failureis suppressed, and more importantly, the dynamic performance and steady state performance are consistent with that in a normal condition.
Description
technical field [0001] The invention relates to a direct thrust fault-tolerant control method for a one-phase open-circuit fault of a linear motor, especially a direct thrust fault-tolerant control method for a five-phase permanent magnet linear motor, which can be applied in aerospace, electric vehicles, etc., which have strict requirements on the reliability and dynamic performance of the motor. Where required. Background technique [0002] With the progress of the times and the improvement of science and technology and living standards, users have higher and higher requirements for vehicles, especially for the safety, reliability and comfort of driving. The performance of the automobile suspension system is of great significance to the driving performance of the automobile, so the research on the steady-state and dynamic performance of the active suspension system has received more and more attention. The cylindrical linear motor is a key component of the active suspensi...
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Patent Timeline
20 Jul 2018
Publication
CN108306571A
- IPC
- H02P25/06; H02P29/028; H02P29/024; H02P23/30
- CPC
- H02P25/06; H02P23/30; H02P29/0243; H02P29/032; H02P25/22; H02P29/028; H02P6/006; H02P21/141
- Inventors
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