KR0163807B1 - Double speed driving method of a variable reluctance motor - Google Patents

Abstract

It relates to a method of driving a variable reluctance motor,

When a pair of adjacent stator poles and a position sensor are respectively installed in the middle, and the rotor is detected by a position sensor installed in the stator poles, a current flows through a coil wound on a trailing stator pole and drives at double speed.

Description

Double speed driving method of variable reluctance motor

The present invention relates to a double speed driving method of a variable reluctance motor, and in particular, a variable reluctance motor having the same sensor sensitivity and the same RL constant by using a microcomputer is changed by changing the conduction order of the sensor circuits. The present invention relates to a double speed driving method of a variable reluctance motor that doubles the rotational speed of the rotor by expanding by an integral multiple.

In general, a switched reluctance motor is a motor that generates a rotational force by converting a change in angle according to the rotation of the rotor into a change in magnetoresistance, that is, a change in reluctance. Therefore, the shape of the rotor is in the form of a salient pole, and the current flows to the appropriate stator coil at a proper rotor angle position for a proper time. At this time, the motor has a drive part electrically configured with an RL circuit, and during any one energizing section, the shape of the current is delayed by the RL time constant.

In addition, the variable reluctance motor requires a control drive circuit for rotation, and the control drive circuit includes position sensing whether the sensor is used or not. In such a device, the electronic response time is fine. The important thing is that during the current transient, the moving rotor changes its position due to inertia force, so when the effective value of the current is flowing through the stator coil, the rotor is already in the next phase. Since it is moved to the position, it does not help increase the torque or speed, but rather decreases the torque or speed, which hinders the speed increase.

A typical representative variable reluctance motor is shown in FIG. 1, and with reference to FIG. 1, the position sensors Sa, Sb, Sc are shown in stator (+ A) (+ B) and (+ A) and ( + B) is installed. Assuming that the rotor 2 is rotated clockwise, the stator coil + A becomes a conductive state when the sensor Sb is turned on, and the stator coil C is turned on when the sensor Sa is turned on. When the sensor Sc is turned on, the stator coil B is sequentially switched so as to be in the conductive state (hereinafter, this driving logic sequence is referred to as a normal driving sequence). In the case of such a variable reluctance motor, to increase the speed, the rotational speed is increased by increasing the amount of input current or by moving the position of the position sensor at an angle.

However, such a conventional variable reluctance motor exhibits proper characteristics only at the position because the installation position of the position sensor is fixed from the beginning, and if the installation position of the position sensor is moved too much, it does not rotate correctly when starting. As the reverse rotation is not the correct switching order, the reverse rotation cannot be performed properly, and the speed limit exists because the current transient and the limitation of the RL time constant cannot be overcome. In order to improve the above problems, a sensing element having a high-speed response characteristic and a power switch having excellent responsiveness should be used, which has a burden of increasing cost, and also has a problem of limit of speed increase.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a double speed driving method of a variable reluctance motor using a microcomputer to double the rotational speed of the rotor using a microcomputer and a position sensor. .

Another object of the present invention is to detect the phase signal in the stator coil to calculate the rotational speed of the rotor, and according to the rotational speed of the variable reluctance motor of the variable reluctance motor to double the rotational speed of the rotor by turning on / off To provide.

1 is a state diagram showing a driving state of a conventional variable reluctance motor.

2 is a block diagram showing a control device of a variable reluctance motor according to the present invention.

3 is a driving circuit of a variable reluctance motor according to the present invention.

4 is a full chart showing a double speed driving method of a variable reluctance motor according to the present invention.

5 and 6 are views showing the driving state of the variable reluctance motor according to the present invention.

* Explanation of symbols for main parts of the drawings

21: motor 22: amplifier

23: microcomputer 23b: input and output port

23c: central processor 23d: memory

25: motor drive gate portion

As a technical means for achieving the above object of the present invention, the method of the present invention is a variable pair of stator poles adjacent to each other, the position sensor is installed in the middle of the two poles to detect the position of the rotor to control the drive circuit A method of driving a reluctance motor, comprising: a first step of driving in a normal mode after power is applied; A second step of detecting the speed of the rotor after receiving the detection signal from the position sensor and proceeding to the first step if the detected speed does not exceed the speed mode; When the detection speed exceeds the double speed mode speed, when the rotor is located in the preceding stator salient pole in the pair of stator salient poles, the current is passed through a coil wound around the stator salient pole after skipping the following stator salient poles. Performing a repetition from the beginning of the step, and when a rotor is positioned in the middle of the pair of stator salient poles, causing a current to flow in a coil wound around a trailing salient pole; A fourth step of detecting the speed of the rotor and determining whether the detected speed is smaller than the speed of the double speed mode and proceeding to the first step if the speed is not small and driving to the normal mode if the speed is small; A fifth step of determining whether a stop signal is input and proceeding to the first step if it is not input, and stopping the motor if it is input; Characterized in that made.

Hereinafter, the present invention will be described in detail with reference to the drawings.

2 is a block diagram showing the configuration of a double speed drive device of a variable reluctance motor using a microcomputer according to the present invention. Referring to FIG. 2, 21 is a variable reluctance motor, 21a, 21b, and 21c is a motor 21. It is a position sensor attached to the back of the, the mounting surface corresponding to the A phase, B phase, C phase as shown in FIG. 22 is an amplification unit, and amplifies and outputs the signal detected by the position sensors 21a, 21b, and 21c. Numeral 23 is a microcomputer, and its inside includes an input and output port 23b, a central processing unit 23c and a memory unit 23d.

The input / output port 23b inputs a signal input from the amplifier 22 to the central processing unit 23c, and transmits a control signal processed and output from the central processing unit 23c to the motor driving gate unit 25. Output The central processing unit 23c processes the position data of the rotor input through the input port 23b by the control program 24 and outputs a control signal according to the processing result to the driving circuit of the motor to control the driving of the motor. do. 23d is a memory section, and 25 is a motor driving gate section.

3 is a driving circuit of a variable reluctance motor according to the present invention, and FIG. 4 is a full chart showing a double speed driving method of the variable reluctance motor according to the present invention, and FIGS. This is a state diagram showing the driving state of the variable reluctance motor.

Hereinafter, the operation and effect of the present invention will be described.

Referring to the present invention with reference to the accompanying drawings, first, the stator of the present invention, as shown in FIG. 1, three sets of phase coils (A, B, C) facing each other in six stator poles are wound do. The A phase coil A is connected in series between the transistors QA and QA 'shown in FIG. 3, and the B phase coil B is connected in series between the transistors QB and QB', and the C phase Coil C is connected in series between transistors QC and QC '. At this time, the current is connected by the Vcc + and Vcc- voltages applied between the common collector terminal of the transistors QA'-QC 'and the common emitter terminal of the transistors QA'-QC'.

Each base of the transistors QA-QC and QA'-QC 'is supplied with outputs of the first to third gate parts GA and GC by phase position sensing sensors Sa, Sb, and Sc, respectively. To be configured.

In addition, each of the diodes DA, DC, DA'-DC ', and D1-D6 connected between the collector-emitter stages of the transistor is turned on among the transistors QA, QC, QA'-QC'. This is to prevent the transistors QA-QC, QA'-QC 'from being destroyed by the counter electromotive force generated in the upper coils A, B, and C at the moment of turning off.

4 is a flowchart showing a method of double speed driving of a variable reluctance motor according to the present invention. Referring to FIG. 4, first, power is applied in step 401 to operate in a normal mode. General description is omitted. Referring to FIG. 1, the normal mode will be briefly described.

When the A position sensor (Sa) is turned on and operates when the phase coil is connected, the central processing unit (23c) that senses it drives the C phase gate parts (Gc, Gc) through the output port. The transistors Qc and Qc 'of the C-phase stator coil C are turned on so that a current flows through the C-phase stator coil C to rotate the rotor. When the rotor rotates and the C position sensor Sc is turned on, the current flows to the B-phase stator coil B by driving the B-phase gate parts Gb and Gb under the control of the central processing unit 23c as described above. And the rotor rotates to approach the B-phase position sensor Sb. The B-phase position sensor Sb is turned on by sensing the approach of the rotor. Accordingly, the current flows through the A-phase stator coil A as described above, thereby rotating the rotor. The above driving method is a normal driving method, and a double speed driving method will be described below.

For the high speed driving method according to the present invention, referring to FIGS. 2 and 3, the signal detected by the position sensor (eg: A position sensor Sa) while the motor 21 is rotating is rotated. When a certain number of signals in proportion to the number of revolutions generated by the number measuring program are generated from the position sensor Sa-Sc, the signals are continuously input to the microcomputer 23 through the input port and the memory unit inside the microcomputer 23 is operated. The speed calculation program stored in 23d converts it into a speed and repeatedly compares it with the preset speed mode speed stored in advance.

Referring to FIG. 4, when the speed detected from the position sensor is smaller than the speed mode speed in step 402, the process is repeated in step 401. When the speed rises and reaches the designated speed mode speed, the microcomputer 23 generates an internal memory unit ( The program stored in 23d) is read, and the gate driving signal is outputted to the motor driving gate unit 25 through the output port of the input / output port 23b, and the excitation order of the stator of the motor 21 is changed by this gate driving signal. .

On the other hand, assuming that the double speed mode has been reached and the double speed mode has been operated at the rotor position as shown in FIG. 1, the A position sensor Sa is turned on so that the detection signal is amplified by the amplifying unit 22. The central processing unit 23c is input to the central processing unit 23c via the input port of the input / output port 23b. In step 403, it is determined whether the A position sensor Sa is on. The B-phase stator is driven by driving the B-phase gate portions Gb and Gb of the motor driving gate portion 25 through the output port of the port 23b to turn on the power switches QB and QB 'of the B-phase stator coil. A current flows through the coil B.

At this time, the rotor is positioned in the B stator coil B by the B-phase current by the inductance of the time constant magnetic circuit and the equivalent resistance of the current. When the A position sensor Sa is not in the on state while repeating step 403 as described above, the flow advances to step 405 to determine whether the B position sensor Sb is on. When the B position sensor Sb is in the ON state, a current flows in the phase C stator coil C in step 406. At this time, the rotor is located as shown in FIG. Thereafter, step 405 is repeated. If the B position sensor Sb is not in the ON state in step 405, the flow proceeds to step 407 to determine whether the C position sensor Sc is in the ON state.

When the rotor is positioned at the C position sensor Sc and the C position sensor Sc is on by the inertial force of the rotor during the current time constant, the current flows to the phase A stator coil A at step 408. Repeat step 407. In step 407, if the C position sensor Sc is not in the on state, the process proceeds to step 409 to determine whether the speed detected from the position sensor is smaller than the speed in the double speed mode. If the detection speed is not smaller than the double speed mode speed, the process of step 401 or less is repeated. If the detection speed is smaller than the double speed mode speed, the operation proceeds to the normal mode in step 410 and proceeds to step 411. In step 411, it is determined whether a stop signal is input, and if a stop signal is not input, the process proceeds to step 401. If a stop signal is input, the motor is stopped and the program ends in step 412.

According to the present invention as described above, by driving a current in the stator coil in the double speed mode when the motor rotates at high speed, it is possible to drive speed without changing the conduction angle of the position sensor or the coil. Therefore, it is possible to overcome the transient phenomenon of the current flowing through the stator coil and the speed limit due to the RL time constant, and to reduce the production cost since no high-speed response element is used.

Claims (1)

In a method of driving a variable reluctance motor in which a pair of adjacent stator poles and position sensors Sa, Sb, Sc are installed in the middle of two poles to sense the position of the rotor and control the drive circuit. After the first step of driving to the normal mode; A second step of detecting the speed of the rotor after receiving the detection signal from the position sensor and proceeding to the first step if the detected speed does not exceed the double speed mode speed; When the detection speed exceeds the double speed mode speed, when the rotor is located in the preceding stator salient pole in the pair of stator salient poles, the current is passed through a coil wound around the stator salient pole after skipping the following stator salient poles. Performing a repetition from the beginning of the step, and when a rotor is positioned in the middle of the pair of stator salient poles, causing a current to flow in a coil wound around a trailing salient pole; A fourth step of detecting the speed of the rotor and determining whether the detected speed is smaller than the speed of the double speed mode and proceeding to the first step if the speed is not small and driving to the normal mode if the speed is small; A fifth step of determining whether a stop signal is input and proceeding to the first step if it is not input, and stopping the motor if it is input; Double speed drive method of the variable reluctance motor, characterized in that consisting of.