KR20060108021A - The driving method of switched reluctance motor and apparatus for the same - Google Patents

Abstract

A method and apparatus for driving a switched reluctance motor are disclosed. The apparatus is characterized in that it comprises an n-phase driving circuit for driving a switched reluctance motor having an n-phase, and a motor driver for driving a switched reluctance motor having a 2n phase using the n-phase driving circuit.

According to the present invention, by providing a motor drive device capable of driving a switched reluctance motor having a 2n phase by using an n-phase drive circuit has the effect of reducing torque ripple without additional costs due to the increase in switching elements have.

Description

The driving method of switched reluctance motor and apparatus for the same}

Figure 1 shows the configuration of a typical three-phase switched reluctance motor.

2 shows a driving circuit of a typical three-phase switched lux tux motor.

3 is a diagram illustrating a torque waveform of a three-phase reluctance motor.

4 is a diagram showing torque waveforms of four-phase and five-phase reluctance motors.

5 is a block diagram showing a driving device of a switched reluctance motor according to the present invention.

6 is a block diagram including a more detailed configuration of an n-phase driving circuit.

7 is a diagram illustrating a six-phase switched reluctance motor according to the present invention.

8 shows a driving circuit of a six-phase switched reluctance motor according to the present invention.

9 is a flowchart illustrating a method of driving a switched reluctance motor according to the present invention.

The present invention relates to a method and apparatus for driving a switched reluctance motor, and more particularly, to a motor driving method and apparatus capable of driving a switched reluctance motor having a 2n phase using an n-phase driving circuit.

A switched reluctance motor is a motor in which both the stator and the rotor are formed as protruding poles, and the winding is wound only on the protruding pole of the stator, and the rotor is composed of the core of the protruding pole type. Therefore, the switched reluctance motor has the advantages of simple structure and high torque density.

Figure 1 shows the configuration of a typical three-phase switched reluctance motor. The three phase switched reluctance motor as shown is composed of a stator and a rotor. When a current flows through the winding wound on the stator protrusion pole, magnetic attraction that tries to align the protrusion pole of the rotor with the stator pole of the stator is generated, thereby generating a rotational force.

2 shows a driving circuit of a typical three-phase switched lux tux motor. The driving circuit of the three-phase switched reluctance motor as shown is composed of six switching elements (Q1 ~ Q6) and six reflux diodes (D1 ~ D6).

Referring to FIG. 2, when the switching elements Q1 and Q2 are turned on, a DC voltage is applied to the winding A, so that a current flows, and the protruding pole of the rotor is aligned with the protruding pole in which the winding A is wound. Next, the switching elements Q3 and Q4 are turned on to excite the B winding to align the protruding poles of the rotor with the B winding, and at the same time, the reflux diodes D1 and D2 connected to the winding A are conducted to reduce the energy accumulated in the A winding to the power supply side. Let's do it. Thus, if the winding is excited in the order of A, B, C, A .. (Q1-Q2, Q3-Q4, Q5-Q6, Q1-Q2 ...), the rotor rotates clockwise.

However, the three-phase switched reluctance motor having such an operation has a problem that the torque ripple is large. 3 is a diagram illustrating a torque waveform of a three-phase reluctance motor. As shown in FIG. 3, the three-phase relaxation tux motor has a large torque ripple, and the torque ripple causes vibration and noise and shows an unstable output characteristic. Therefore, the design and driving should be performed in a direction that minimizes this.

4 is a diagram showing torque waveforms of four-phase and five-phase reluctance motors. As shown in FIG. 4, by increasing the number of phases of the motor, it is possible to reduce torque ripple and solve the above problem. However, when increasing the constant of the motor, an additional switching element for controlling the phase added to the driving circuit is required, which causes a problem that the manufacturing cost increases.

The technical problem to be achieved by the present invention is to drive a 2n phase switched reluctance motor in order to reduce torque ripple without incurring additional costs due to the increase in switching elements, by using the n-phase drive circuit 2n phase The present invention provides a method and apparatus for driving a switched reluctance motor.

According to the present invention for achieving the above technical problem, an apparatus for driving a switched reluctance motor is an n-phase driving circuit for driving a switched reluctance motor having n phases, and a switched reluctance having 2n phases using the n-phase driving circuit. It characterized in that it comprises a motor driving unit for driving the traction motor.

According to the present invention for achieving the above technical problem, a method of driving a switched reluctance motor in the n-phase driving circuit for driving a switched reluctance motor having an n-phase, having a 2n phase by using the n-phase driving circuit And a motor driving step of driving the switched reluctance motor.

Hereinafter, a method and apparatus for driving a switched reluctance motor according to the present invention will be described with reference to the accompanying drawings.

5 is a block diagram showing a driving device of a switched reluctance motor according to the present invention. The driving apparatus of the switched reluctance motor as shown in the drawing includes an n-phase driving circuit 500 and a motor driving unit 510.

The n-phase driving circuit 500 drives a switched reluctance motor having an n-phase. 6 is a block diagram including a more detailed configuration of the n-phase driving circuit 500. Referring to FIG. 6, the n-phase driving circuit 500 preferably includes a voltage applying unit 600 and a voltage emitting unit 610.

The voltage applying unit 600 applies a DC voltage to each phase of the motor. In this case, the voltage applying unit 600 connects each phase of the motor with a DC voltage through a switching element. The switching element of the voltage applying unit 600 is preferably implemented with a transistor.

The voltage discharge unit 610 discharges the applied voltage. At this time, the voltage discharge unit 610 connects each phase of the motor with a DC voltage as a reflux diode. In the voltage dissipation unit 610, an upper portion of each phase of the motor is connected to a reference potential point and the freewheeling diode, and a lower portion of each phase of the motor is connected to a DC voltage and the reflux diode.

The motor driver 510 drives a switched reluctance motor having a 2n phase by using the n-phase driving circuit. In this case, it is preferable that the motor driving unit 510 is connected to the lower end switch of the adjacent side end from the one upper end switch of the n-phase driving circuit.

7 is a diagram illustrating a six-phase switched reluctance motor according to the present invention, and FIG. 8 illustrates a driving circuit of the six-phase switched reluctance motor according to the present invention. A preferred embodiment of the present invention will be described with reference to FIGS. 7 and 8.

Referring to FIG. 8, two phases are connected to each switching element. Three phases of the six-phase windings are connected in the same manner as the conventional three-phase driving circuit, and the remaining three phases are connected to one lower end switch of the adjacent side end from one upper end switch of the driving circuit.

First, when the Q1 and Q2 elements of FIG. 8 are turned on, a DC voltage is applied to the A winding to flow a current, and the protruding pole of the rotor is aligned with the protruding pole in which the A winding is wound. Next, turn off the Q2 element and turn on the Q4 element to excite the B winding to align the protruding pole of the rotor with the B winding, and at the same time, the reflux diodes D1 and D2 connected to the winding A are turned on to store the energy stored in the A winding on the power side To reduce.

Subsequently, the Q1 element is turned OFF, the Q3 element is turned ON to excite the C winding to align it with the C winding, and at the same time, the energy accumulated in the B winding through the D2 and D3 diodes is reduced to the power supply side. Like this, windings A, B, C, D, E, F, A ... (Q1-Q2, Q1-Q4, Q3-Q4, Q3-Q6, Q5-Q6, Q5-Q2, Q1-Q2 ... If it is excited in the order of.), The rotor will rotate clockwise. By controlling each switching element in this way, a six-phase switched reluctance motor can be driven, which reduces torque ripple than when driving a motor with a lower number of phases.

9 is a flowchart illustrating a method of driving a switched reluctance motor according to the present invention. A method of driving a switched reluctance motor according to the present invention will be described with reference to FIGS. 5 and 6.

Referring to FIG. 9, the voltage applying unit 600 applies a DC voltage to one of the n phases of the motor in operation 900. The DC voltage is applied to one phase by turning on the switching element of the voltage applying unit 600. When the lower end of the next switching element is turned off, the voltage is discharged through the reflux diode of the voltage emitting part 610 to emit the DC voltage applied to the first phase (step 910). At the same time, the voltage applying unit 600 turns on the lower end of the switching elements of the adjacent phase to apply the DC voltage to the adjacent phase simultaneously with the voltage emission of the one phase (step 920). It is determined whether the motor driving is completed (step 930), and the process is terminated when the motor driving is completed.

If the motor drive is not completed, the motor continues to be driven while repeating steps 900 to 930.

Such a method and apparatus of the present invention have been described with reference to the embodiments shown in the drawings for clarity, but these are merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

As described above, according to the present invention, by providing a motor drive device capable of driving a switched reluctance motor having a 2n phase by using an n-phase drive circuit torque without additional costs due to the increase in the switching element It has the effect of reducing ripple.

Claims (12)

an n-phase driving circuit for driving a switched reluctance motor having an n-phase; And And a motor driving unit for driving a switched reluctance motor having a 2n phase by using the n-phase driving circuit. The method of claim 1, wherein the n-phase driving circuit A voltage applying unit for applying a DC voltage to each phase of the motor; And And a voltage discharge unit for discharging the applied voltage. The method of claim 2, wherein the voltage applying unit Each phase of the motor is characterized in that connected to the DC voltage through a switching element The voltage discharge unit Each phase of the motor is connected to a DC voltage by a reflux diode, characterized in that Motor drive. The method of claim 3, wherein the voltage emitting unit The upper part of each phase of the motor is connected to the reference potential point and the reflux diode A lower portion of each phase of the motor is connected to a DC voltage and the freewheeling diode. The method of claim 3, wherein The switching device of the voltage applying unit is a motor driving device, characterized in that implemented by a transistor. According to claim 1, wherein the motor drive unit The remaining n-phase of the motor is connected to the lower end switch of the adjacent side end from the one upper end switch of the n-phase drive circuit. In an n-phase driving circuit for driving a switched reluctance motor having an n-phase And a motor driving step of driving a switched reluctance motor having a 2n phase by using the n-phase driving circuit. The method of claim 7, wherein the driving method of the n-phase driving circuit A voltage application step of applying a DC voltage to one of the n phases of the motor; A voltage discharging step of discharging the applied voltage; And And discharging said applied voltage and simultaneously applying a voltage to an adjacent phase of said phase to which said voltage is applied. The method of claim 8, wherein the voltage applying step and applying a voltage to the adjacent phase Each phase of the motor is characterized in that connected to the DC voltage through a switching element The voltage release step Each phase of the motor is connected to a DC voltage by a reflux diode, characterized in that How to drive a motor. The method of claim 9, wherein the voltage discharge step The upper part of each phase of the motor is connected to the reference potential point and the reflux diode A lower portion of each phase of the motor is connected to a DC voltage and the freewheeling diode. The method of claim 9, The switching device of the voltage application step is a motor driving method, characterized in that implemented as a transistor. The method of claim 7, wherein the motor driving step The remaining n-phase of the motor is connected to the lower end switch of the adjacent side end from the one upper end switch of the n-phase drive circuit.

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