A tapered magnetic bearing switched reluctance motor and its control method

Abstract

The present invention discloses a taper magnetic bearing switch reluctance motor and a control method thereof. The motor is formed by one switch reluctance motor and two taper magnetic bearings; a taper stator is formed by 4 E-shaped structures, the central tooth of each E-shaped structure is winded with a vertical suspension winding, is winded at, each of other two teeth are respectively winded with an axial direction suspension winding, the vertical suspension windings and the axial direction suspension windings are connected in series to form a set of the axial direction suspension winding; an armature winding crosses the two taper stators and a reluctance motor stator to form 3-phase armature winding; rotation control is the same as a traditional switch reluctance motor control mode, and bias flux is generated for suspension; and five suspension forces are associated with the 3-phase armature winding current, current of 4 vertical suspension windings and current of 2 vertical suspension windings; the two vertical suspension windings can optimize the bias flux to allow the generated bias flux to be equal when the 3-phase armature winding performs individual excitation so as to solve the problem that the vertical suspension force output is unbalance. The motor system is high in integration degree and high in current utilization rate and realizes decoupling between the torque and the suspension force.

Description

technical field [0001] The invention relates to a tapered magnetic bearing switched reluctance motor and a control method thereof, belonging to the technical field of magnetic levitation switched reluctance motors and control thereof. Background technique [0002] The magnetic levitation switched reluctance motor not only has the advantages of no friction and no lubrication, but also inherits the high-speed adaptability of the switched reluctance motor and meets the harsh working environment. It has unique advantages in aerospace, flywheel energy storage and military applications. [0003] Tapered magnetic bearing switched reluctance motor is a new type of magnetic levitation motor, which can realize the natural decoupling of torque and levitation force, and utilizes the magnetic flux generated in the magnetic bearing by the armature winding current of the switched reluctance motor as The bias flux needed to generate the levitation force; in addition, since the magnetic bear...

AI Technical Summary

Problems solved by technology

However, since the three-phase armature current takes turns as the current to generate the bias flux, due to the limitation of the E-type magnetic bearing stator, the bias flux generated when one phase is turned on is different from that of the other two phases, resulting in the output of the levitation motor The suspension force is not balanced, which affects the stability of suspension operation and high-speed suspension accuracy

Therefore, the present invention proposes a tapered magnetic bearing switched reluctance motor and its control method. The axial suspension windings in each axial magnetic bearing of the motor are connected in series to form a set of axial suspension windings, which are independently controlled , in addition to controlling the axial levitation force, it also tracks the currents of the B-phase and C-phase armature windings, and makes them equal to the A-phase armature winding current, thereby forming a symmetrical bias flux, and then solving the problem of each phase when it is separately excited Unbalanced output of radial suspension force

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