CN103780184A - Direct torque and direct suspension force control method for 12/8-stage single winding switch reluctance machine without bearing - Google Patents

Abstract

The invention provides a direct torque and direct suspension force control method for a single winding switch reluctance machine without a bearing. Synchronous flux linkage amplitude of the motor is controlled as a fixed value, electromagnetic torque is directly controlled by controlling phase rotation of a synchronous flux linkage, and direct control over radial suspension force is achieved by controlling imbalance of the flux linkages of four windings of one phase, wherein a rotor position angle of the phase ranges from -7.5 degrees to 7.5 degrees. First, a suitable basic voltage symbol combination is selected from a basic voltage symbol combination table according to an area where the flux linkage phase is located, a flux linkage amplitude value hysteresis signal and a torque hysteresis signal, then the phase with the rotor position angle ranging from -7.5 degrees to 7.5 degrees is selected, and imbalance excitation is conducted on the four windings according to a voltage symbol corresponding to the phase in the basic voltage symbol combination. Voltage symbols of the four windings of the remaining phases are directly given as the voltage symbols corresponding to the two phases in the basic voltage symbol combination. Finally, switch signals of main circuit power switch tubes of the windings are applied according to the voltage symbols given by the twelve windings.

Description

A kind of Direct Torque of 12/8 utmost point simplex winding bearing-free switch reluctance motor and direct suspending power control method

Technical field:

The present invention relates to a kind of Direct Torque and direct suspending power control method of 12/8 utmost point simplex winding bearing-free switch reluctance motor, belong to the control method field of bearing-free switch reluctance motor.

Background technology:

Traditional bearing-free switch reluctance motor can be divided into double-winding structure and simplex winding structure.Double winding bearing-free switch reluctance motor is the extra a set of suspending windings of increase on the stator of original regular tap reluctance motor, by the electric current of rational this double winding of control, its motor is had from the function suspending, to realize high-speed cruising; And simplex winding bearing-free switch reluctance motor is structurally similar with regular tap reluctance motor, difference is that the winding on each stator tooth is independent mutually, by reasonably independently controlling the electric current of each winding, realizes suspension function certainly and the High Rotation Speed of motor.

No matter double winding bearing-free switch reluctance motor or simplex winding bearing-free switch reluctance motor, all exists the relation of close coupling between torque and suspending power, by setting up Mathematical Modeling and the corresponding control strategy of design, realize its rotation and suspension.For concrete torque and suspending power control method, all adopt at present current tracking copped wave control.Control strategy depends on mathematical models and the complicated parameter of electric machine too much, make control system too complicated, and dynamic responding speed is slower, and torque and suspending power pulsation are larger, have limited the high-speed operation performance of bearing-free motor.

Summary of the invention:

The invention provides a kind of Direct Torque and direct suspending power control method of 12/8 utmost point simplex winding bearing-free switch reluctance motor, by the direct control to torque and suspending power, to reducing torque pulsation and suspending power pulsation, thereby improve control precision and the response speed of system.

The present invention adopts following technical scheme: a kind of Direct Torque of 12/8 utmost point simplex winding bearing-free switch reluctance motor and direct suspending power control method, described 12/8 utmost point simplex winding bearing-free switch reluctance motor is 3 phase 12/8 utmost point simplex winding bearing-free switch reluctance motors, the rotor of its stator by 12 tooth utmost points and 8 tooth utmost points forms, comprise the A phase being formed by tetra-windings of A1-A4, the B phase being formed by tetra-windings of B1-B4, the C phase being formed by tetra-windings of C1-C4, four windings of every phase are independently controlled, and described control method comprises

1) magnetic linkage that A phase magnetic linkage is obtained by four winding turns of A phase is synthetic:

ψ _A=ψ _A1+ψ _A2+ψ _A3+ψ _A4 （1）

In like manner can obtain the magnetic linkage of B phase and C phase;

2) in space coordinates, transform on α β coordinate system synthetic the three-phase magnetic linkage of 120 ° of angle mutual deviations, under α β coordinate system, try to achieve amplitude and the phase place of synthetic magnetic linkage:

ψ _α＝ψ _A-ψ _Bcos60°-ψ _Ccos60° （2）

ψ _β＝ψ _Bsin60°-ψ _Csin60° （3）

${\mathrm{\ψ}}_s=\sqrt{{\mathrm{\ψ}}_{\mathrm{\α}}^2+{\mathrm{\ψ}}_{\mathrm{\β}}^2}---\left(4\right)$

$\mathrm{\δ}=\arctan 2\left(\frac{{\mathrm{\ψ}}_{\mathrm{\β}}}{{\mathrm{\ψ}}_{\mathrm{\α}}}\right)---\left(5\right)$

3) be definite value by the amplitude control of synthetic magnetic linkage, the rotation of controlling synthetic magnetic linkage phase place reaches the direct control to torque; The uneven excitation of four windings of the larger phase of suspending power coefficient is reached to the direct control to suspending power, according to the stagnant ring signal of suspending power and rotor position angle, choose rotor position angle at interval [7.5 °, 7.5 °] an interior phase, apply unbalance voltage to four windings of this phase, the magnetic linkage imbalance that four winding turns are obtained, and then reach suspending power is directly controlled.

Described 3) in first according to magnetic linkage phase place region, the stagnant ring signal of magnetic linkage amplitude and the stagnant ring signal of torque, from fundamental voltage symbol combination table, select suitable fundamental voltage symbol combination, then choose rotor position angle at interval [7.5 °, 7.5 °] an interior phase, according to this mutually corresponding voltage sign in selected fundamental voltage symbol combination, four windings are carried out to uneven excitation, and four winding voltage symbols separately of all the other two-phases are directly given as the corresponding voltage sign of this two-phase in selected fundamental voltage symbol combination.

The Direct Torque of the simplex winding bearing-free switch reluctance motor that the present invention proposes is with the major advantage of direct suspending power control method:

(1) realized the direct control of torque and suspending power, reduced torque and suspending power pulsation, improved control precision, motor suspendability is good;

(2) control method is simple, has realized the decoupling zero control of torque and suspending power, and exceed depend on accurate Mathematical Modeling.

Accompanying drawing explanation:

Fig. 1 is control object of the present invention, the structural representation of three-phase 12/8 utmost point simplex winding bearing-free switch reluctance motor, wherein A is made up of tetra-windings of A1-A4, and B is made up of tetra-windings of B1-B4, C is made up of tetra-windings of C1-C4, and each winding is independently controlled.

Fig. 2 is flux linkage vector figure, by A phase magnetic linkage axis and α axial alignment.

Fig. 3 is fundamental voltage symbol combination schematic diagram, and k represents 6 regions of magnetic linkage, S ₁-S ₆for fundamental voltage symbol combination, in its bracket, Section 1 is the fundamental voltage symbol of A phase, and Section 2 is the fundamental voltage symbol of B phase, and Section 3 is the fundamental voltage symbol of C phase.

Embodiment:

Please refer to shown in Fig. 1, the present invention's 12/8 utmost point simplex winding bearing-free switch reluctance motor is 3 traditional phase 12/8 utmost point simplex winding bearing-free switch reluctance motors, and the rotor of its stator by 12 tooth utmost points and 8 tooth utmost points forms, and four windings of every phase are independently controlled.Wherein A is made up of tetra-windings of A1-A4, and B is made up of tetra-windings of B1-B4, and C is made up of tetra-windings of C1-C4, and each winding is independently controlled.

The magnetic linkage that A phase magnetic linkage is obtained by its four winding turns is synthetic:

ψ _A=ψ _A1+ψ _A2+ψ _A3+ψ _A4 （1）

In like manner can learn the magnetic linkage of B phase and C phase.

Please refer to shown in Fig. 2 and Fig. 3, in space coordinates, transform on α β coordinate system synthetic the three-phase magnetic linkage of 120 ° of angle mutual deviations, under α β coordinate system, try to achieve amplitude and the phase place of synthetic magnetic linkage:

ψ _α＝ψ _A-ψ _Bcos60°-ψ _Ccos60° （2）

ψ _β＝ψ _Bsin60°-ψ _Csin60° （3）

${\mathrm{\ψ}}_s=\sqrt{{\mathrm{\ψ}}_{\mathrm{\α}}^2+{\mathrm{\ψ}}_{\mathrm{\β}}^2}---\left(4\right)$

$\mathrm{\δ}=\arctan 2\left(\frac{{\mathrm{\ψ}}_{\mathrm{\β}}}{{\mathrm{\ψ}}_{\mathrm{\α}}}\right)---\left(5\right)$

Be definite value by the amplitude control of synthetic magnetic linkage, the rotation of controlling synthetic magnetic linkage phase place reaches the object to torque direct control.Be that the voltage sign combination that selected phase is ahead of current magnetic linkage phase place can make torque increase, the voltage sign combination that selected phase lags behind current magnetic linkage phase place can make torque reduce.First judge magnetic linkage phase place region k according to following table:

δ	0°＜δ≤60°	60°＜δ≤120°	120°＜δ≤180°	-180°＜δ≤-120°	-120°＜δ≤-60°	-60°＜δ≤0°
							k	1	2	3	4	5	6

According to phase place region k, consider the stagnant ring signal of torque and the stagnant ring signal of magnetic linkage amplitude, select suitable fundamental voltage symbol combination, magnetic linkage amplitude is controlled in stagnant ring, meet the requirement of torque simultaneously.If magnetic linkage phase place region represents with k, the option table of fundamental voltage symbol combination can be expressed as:

Note: classify example as with first, in the time that needs torque and magnetic linkage amplitude increase simultaneously

if current magnetic linkage phase place region is k, select k+1 voltage sign combination.

According to the stagnant ring signal of suspending power and rotor position angle, choose the phase that suspending power coefficient is larger, be that rotor position angle is at interval [7.5 °, 7.5 °] an interior phase, according to this mutually corresponding voltage sign in selected fundamental voltage symbol combination, four of this phase windings are carried out to uneven excitation.And then produce the suspending power that meets the demands.Four winding voltage symbols separately of all the other two-phases are directly given as the corresponding voltage sign of this two-phase in selected fundamental voltage symbol combination.For example, if A phase rotor position angle is in interval [7.5 °, 7.5 °] in, its uneven excitation mode is: control A1 winding voltage is greater than A3 winding voltage and can produces A α direction suspending power, control the suspending power that A2 winding voltage is greater than A4 winding voltage and can produces A β direction, A phase unbalance voltage symbol table is:

Note: * represents any stagnant ring signal.

Similarly, the unbalance voltage symbol table of B phase and C phase can similarly obtain.

The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make under the premise without departing from the principles of the invention some improvement, and these improve and also should be considered as protection scope of the present invention.

Claims (2)

1. the Direct Torque of a utmost point simplex winding bearing-free switch reluctance motor and direct suspending power control method, described 12/8 utmost point simplex winding bearing-free switch reluctance motor is 3 phase 12/8 utmost point simplex winding bearing-free switch reluctance motors, the rotor of its stator by 12 tooth utmost points and 8 tooth utmost points forms, comprise the A phase being formed by tetra-windings of A1-A4, the B phase being formed by tetra-windings of B1-B4, the C phase being formed by tetra-windings of C1-C4, four windings of every phase are independently controlled, and it is characterized in that: described control method comprises

1) magnetic linkage that A phase magnetic linkage is obtained by four winding turns of A phase is synthetic:

ψ _A=ψ _A1+ψ _A2+ψ _A3+ψ _A4 （1）

In like manner can obtain the magnetic linkage of B phase and C phase;

2) in space coordinates, transform on α β coordinate system synthetic the three-phase magnetic linkage of 120 ° of angle mutual deviations, under α β coordinate system, try to achieve amplitude and the phase place of synthetic magnetic linkage:

ψ _α＝ψ _A-ψ _Bcos60°-ψ _Ccos60° （2）

ψ _β＝ψ _Bsin60°-ψ _Csin60° （3）

${\mathrm{\ψ}}_s=\sqrt{{\mathrm{\ψ}}_{\mathrm{\α}}^2+{\mathrm{\ψ}}_{\mathrm{\β}}^2}---\left(4\right)$

$\mathrm{\δ}=\arctan 2\left(\frac{{\mathrm{\ψ}}_{\mathrm{\β}}}{{\mathrm{\ψ}}_{\mathrm{\α}}}\right)---\left(5\right)$

3) be definite value by the amplitude control of synthetic magnetic linkage, the rotation of controlling synthetic magnetic linkage phase place reaches the direct control to torque; The uneven excitation of four windings of the larger phase of suspending power coefficient is reached to the direct control to suspending power, according to the stagnant ring signal of suspending power and rotor position angle, choose rotor position angle at interval [7.5 °, 7.5 °] an interior phase, apply unbalance voltage to four windings of this phase, the magnetic linkage imbalance that four winding turns are obtained, and then reach suspending power is directly controlled.

2. the Direct Torque of 12/8 utmost point simplex winding bearing-free switch reluctance motor as claimed in claim 1 and direct suspending power control method, it is characterized in that: described 3) first according to magnetic linkage phase place region, the stagnant ring signal of magnetic linkage amplitude and the stagnant ring signal of torque, from fundamental voltage symbol combination table, select suitable fundamental voltage symbol combination, then choose rotor position angle at interval [7.5 °, 7.5 °] an interior phase, according to this mutually corresponding voltage sign in selected fundamental voltage symbol combination, four windings are carried out to uneven excitation, four winding voltage symbols separately of all the other two-phases are directly given as the corresponding voltage sign of this two-phase in selected fundamental voltage symbol combination.

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