Displacement optimization control method of bearingless switched reluctance motor
A switched reluctance motor, optimized control technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve problems such as suspension failure, poor displacement anti-interference ability, suspension force mutation, etc., to achieve simplified control strategy, anti-interference powerful effect
Pending Publication Date: 2022-04-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
Finally, the displacement immunity of traditional current control is poor
When the motor undergoes dynamic speed-up and down-speed or load-changing experiments, the average excitation current of each phase winding will change suddenly, resulting in sudden changes in the suspension force, fluctuations in radial displacement, and sometimes even hitting the auxiliary bearing, resulting in suspension failure
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[0037] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0038] Fig. 1(a) is a schematic diagram of the integration path of the Maxwell stress method implemented in the present invention. In the figure, 1→7 represents the integration path, B m is the air gap magnetic density of the overlapped part of the stator and rotor, B f1 and B f2 is the edge flux density on both sides. According to this integral path, the radial electromagnetic force expressions in the α and β directions can be deduced, as follows:
[0039] f α =h[(B ma1 2 -B ma3 2 )(πr / 12-r|θ|)+(B fa1 2 -B fa3 2 )r|θ|] / 2μ 0
[0040] f β =h[(B ma2 2 -B ma4 2 )(πr / 12-r|θ|)+(B fa2 2 -B fa4 2 )r|θ|] / 2μ 0
[0041] Among them, F α , F β are the rad...
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The invention discloses a displacement optimization control method for a bearingless switched reluctance motor, and the method specifically comprises the steps: firstly, deducing the current and displacement stiffness coefficients of the bearingless switched reluctance motor; secondly, the current difference value of the opposite tooth poles of the motor is directly obtained through displacement closed-loop control; and then, the rotating speed control is to fix the length of a current conduction interval, and change the position of the conduction interval by adjusting an advance angle, so that the generated positive and negative torques are partially counteracted, and the effect of adjusting the rotating speed is achieved. And finally, estimating the average excitation current of the four sets of windings of each phase in the conduction interval through the torque load and the radial force load applied by the motor, and calculating the average excitation current and the relative tooth pole current difference value obtained by the displacement ring to obtain the final current of each tooth pole winding for control. The control strategy provided by the invention directly controls the radial displacement of the rotor, is completely separated from a mathematical model, and realizes the independent control of the torque and the suspension displacement.
Description
technical field [0001] The invention relates to a displacement optimization control method of a bearingless switched reluctance motor, belonging to the technical field of displacement control of a bearingless switched reluctance motor. Background technique [0002] Bearingless switched reluctance motor (BSRM) is a new type of motor formed by applying bearingless technology to traditional switched reluctance motor. It has the function of self-suspension while rotating. The motor is also divided into a single-winding motor and a double-winding motor according to the number of windings on the stator. The single-winding motor means that there is only one set of windings on each stator tooth pole. By controlling the current on the windings, the motor can achieve self-suspension while rotating at high speed. The double-winding motor has two sets of windings on each stator tooth pole, one of which is connected in series in forward direction to generate a balanced bias magnetic fie...
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IPC IPC(8): H02P23/00H02P25/08
CPCH02P23/0004H02P25/08
Inventor 俞强曹鑫郝振洋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS