KR0137103B1 - A double speed driving method and circuit for switched reluctance motor - Google Patents

Abstract

In a switched reluctance motor composed of a stator wound with a plurality of phase coils on a plurality of poles and a rotor installed in the stator, each phase is started at the time of starting the motor in order to double the motor regardless of the current transient caused by the RL time constant. It operates in the normal mode of supplying the sequential current to the plurality of phase coils by the output of the position sensing sensor. When the rotational speed of the motor reaches a predetermined value, the output of each of the upper level sensing sensors is double-spaced to provide current to the plurality of phase coils. To supply.

Description

Method of controlling double speed drive of switched reluctance motor and its circuit

1 is a position sensor arrangement and circuit diagram of a conventional switched reluctance motor

2 is a circuit diagram of FIG.

3 is a position sensor arrangement and circuit of a switched reluctance motor according to the present invention.

Connection diagram

4 is a circuit diagram of the present invention.

5 (A)-(C) show the rotor position for each rotation angle in the double speed mode according to the present invention.

attitude

* Explanation of symbols for the main parts of the drawings

10: stator 20: rotor

21: Swivel plate 22: Slit

23: shaft 41-43: chopper circuit

50: relay 60: speed detection unit

61: sensor 62: counter

63: down sampler 64: comparator

65: amplifier 66: gate circuit

Sa-Sc: Position sensor SW ₁ -SW ₃ : Relay contact

Ga-Gc: Gate Circuit

The present invention provides a switched reluctance motor capable of driving a motor at high speed by double-spaced a sensing signal of a sensor at an angular velocity level in consideration of electrical transient and dynamic motion transient during switching driving of a reluctance motor. It relates to a double speed drive control method and a circuit thereof.

The switched reluctance motor, which is currently being studied as a next-generation motor, is a motor that obtains driving force by converting a change in angle according to the rotation of the rotor into a change in magnetoresistance, that is, a reluctance. The rotor shape of such a reluctance motor takes a salient pole and causes a current to flow to the stator coil for a predetermined time at an appropriate rotor angle position. At this time, the motor is composed of the RL series circuit electrically, the shape of the current in any energization section is delayed rise with time constant.

The switched reluctance motor is also rotationally controlled by a drive control circuit having a position sensor, the position sensor having a fine electronic response time.

Since the electromagnetic response time is changed by the inertia force during the transient time of the current while the rotor is rotating at high speed, when the effective value of the current is flowing through the stator coil, the rotor is already moved to the corresponding position of the next phase. As it is moved, it acts as an obstacle to the increase of coat or speed.

1 and 2 are wiring connection diagrams and circuit diagrams of a switched reluctance motor (a reluctance motor having six stator poles and four rotor poles) of a conventional 6/4 system. The stator having six stator poles is shown in FIG. Each pair of poles is wound with three sets of phase foils (A +, A-) (Ｂ +, Ｂ-) (C +, C-).

The phase-A coils A + and A- are connected in series between the transistors Za and Z-phase coils, and the phase-phase coils are connected in series between the transistors and B-phase coils. (C +, C-) are connected in series between the transistors (Ｑc, Vc) and are interposed between the common collector stage of the transistors and the common emitter stage of the transistors. The connection is made so that the current supplied by the voltage is supplied.

Each of the bases of the transistors is configured such that a chopping signal having a pulse type is supplied from the first to third chopper circuits 41 to 34,

The output of the first-to-three gate circuits Ga-Gc by the respective phase position detecting sensor SA-Sc is supplied to each of the bases of the transistors Va-Vc.

The phase position sensors Sa-Sc are arranged at equal intervals for the six stator poles.

Accordingly, when the transistors Qa and Qa 'are turned on by the chopper circuit 41 and the gate circuit Ga, and current flows through the A-phase coils A- and A +, the phase-phase position sensor Sa ) Is sensed and provided to the third gate circuit Gc, this time the transistor Qc 'is turned on by the output of the third gate circuit Gc.

At this time, since the transistor Qc is turned on by the third chopper circuit 43, current flows through the C-phase coils C- and C +. When a current flows through the C-phase coil C-, the C-phase position sensor Sc detects this and turns on the transistor Qa 'through the first gate circuit Ga. This time, the A-phase coil A + ， A current flows through A-).

The rotor 20 of the motor is rotated through the current circulation supply to each phase coil. As described above, the rotor changes its position due to inertial force during the transient of current (delay rise of the current by the RL time constant). As a result, torque and speed decreases.

In order to solve this problem, a sensing element having a high speed response characteristic and a power switch (transistor) having excellent response characteristics should be used. In this case, a cost increase burden and a problem of speed increase cannot be exceeded.

In general, it is conceivable to compensate for the decrease in the rotational speed by arranging the position of the upper position sensor at a predetermined angle, but the position of the position sensor is fixed at first, and only the original position can be obtained. Because of the design, if the position of the position sensor is moved too large, forward rotation is not made at the start. Also, reverse rotation is not a normal switching sequence, which prevents rotation.

It is an object of the present invention to provide a method for driving a motor at double speed by preventing a speed drop caused by a detection speed of each position sensor of the switched reluctance motor and a transient phenomenon of the motor current.

Another object of the present invention is to provide a control circuit which enables double speed driving of a motor by double-sparcing the output of the angular position sensor of the switched reluctance motor.

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

The double speed driving method of the switched reluctance motor according to the present invention instead of the conventional method of adjusting the sensor position to negate the electrical time constant to compensate for the transient phenomenon caused by the electrical RL time constant acting as a disturbing factor in the high speed operation of the motor, Double speeding the output of the position sensor that controls the current supply to the stator coil when the speed of the motor reaches a certain level overcomes the problems related to the electrical time constant that hinders the speed of the switched reluctance motor. To make it possible.

3 is a connection diagram of a stator coil for double speed driving of a switched reluctance motor according to the present invention. The stator coil is wound for each pole of the stator 10 provided with six poles, and the stator coils of the stator poles facing each other are serially connected. To form a three-phase circuit of A, B, C, and to detect the pole position of the rotor 20 due to the magnetic field change of each phase of the stator coil three three-phase position sensor (Sa, Sb and Sc are attached to the stator 10.

4 is a configuration diagram of a double speed drive control circuit of a 6/4 system motor according to the present invention, Vdd through each transistor Qa-Qc selectively switched and controlled by the 1-3 chopper circuit 41-43. The current by the voltage is connected to the A-phase coils (A-, A +), the B-phase coils (Ｂ-, Ｂ +), and the C-phase coils (C-, C +), respectively.

A phase current with the phase A coils (A +, A-) are each in the normal mode, the terminal (a) and the double-speed mode terminal (b) of the relay second contact (SW ₂₎ of the first relay jeopjeop (SW ₁₎ The connected transistor Qa 'or the transistor Qa' is connected to flow.

The B-phase current through the B-phase coils (Ｂ-, Ｂ +) is connected to the normal mode terminal a of the relay second contact SW ₂ and the double speed mode terminal b of the relay third contact SW ₃ , respectively. The connected transistor Qb 'or the transistor Qc' is connected to flow.

The C-phase current through the C-phase coils C- and C + is connected to the normal mode terminal a of the relay third contact SW ₃ and the double speed mode terminal b of the relay first contact SW ₁ , respectively. The connected transistor Qc 'or the transistor Qa' is connected to flow.

Each of the transistors Qa'-Qc is configured to be selectively controlled by the 1-3 gate circuit Ga-Gc.

The first gate circuit Ga is connected to provide a position sensing output of the B phase position sensor Sb for detecting a magnetic field change in the B phase coil B +.

The second gate circuit Gb is connected to provide a position sensing output of the C phase position sensor Sc for detecting a magnetic field change in the C-phase coil C-, and to the third gate circuit Gc. It is connected to provide a position detection output of the A-phase position sensor (Sc) for detecting a change in the magnetic field in the A-phase coil (A +).

On the other hand, the _first contact point (SW ₁ -SW ₃ ) is a contact that is interlocked by the on / off of the relay 50, the relay 50 is a rotary plate 21, the shaft 23 is connected to the rotor 20 It is configured to be controlled by the speed detecting unit 60 for detecting the sled 22 of the motor to determine the rotational speed.

The speed detecting unit 60 includes a sensor 61 that detects the slits 22, a counter 62 that counts the number of slits sensed by the sensor 61, and counting of the counters 62. A down sampler 63 for generating a modern rotation speed value of the motor from an output, a comparator 64 for comparing and determining a rotation speed value of the down sampler 63 and a reference speed set value, and an output value of the comparator 64. And an amplifier 65 for amplifying the voltage and a gate circuit 66 that receives the output of the amplifier 65 and generates a driving output of the relay 50.

The operation and effects of the switched redundancy motor for double speed drive of the 6/4 system configured as described above are as follows.

Referring to FIGS. 3 and 4, when the switched redundancy motor is started and the magnetic field generated by the A-phase coils A- and A + is detected by the A-phase position sensor Sa, the third gate circuit Gc. Transistor Qc 'is driven to supply current to the C-phase stator coils C- and C +. When the magnetic field in the C-phase coils C- and C + is detected by the C-phase position sensor Sc, the second gate circuit Gb is turned on, and then the B-phase coil B is turned on by the transistor Qb '. -, B +) is supplied with current.

When current flows through the B-phase coil B + to form a magnetic field, it is detected by the B-phase position sensor Sb, and accordingly, the transistor Qa 'is turned on by the first gate circuit Ga. Current is supplied to (A-, A +).

This action will start the motor and enter normal mode.

At the same time, the sensor 61 of the speed detecting unit 60 detects the slits 22 of the rotating plate 21 connected to the rotor 20 and transmits them to the counter 62. In the down sampler 63, the counter 62 The rotation speed value is output from the number of counts. Based on this, the comparator 64 compares the reference speed setting value with the current rotation speed value of the down sampler 63 and outputs a normal driving signal when the current rotation speed value reaches the reference speed setting value.

Since the output of the comparator 64 triggers the gate circuit 66 through the amplifier 60, the relay 50 operates.

When the relay 50 is driven, all of the _{first to third} contacts SW _{1 to} SW ₃ are switched from the normal mode terminals a to the double speed mode terminals b, and thus the B phase position detection sensor Sb. ) Supplies current to the C-phase coils (C- and C +), and supplies current to the A-phase coils (A- and A +) by the C-phase position sensor (Sc) and A-phase position sensor By Sa, a sequence of supplying current to the B-phase coils B- and B + is made.

That is, switching to the double speed mode is made.

In this case, since the sensor output signal processing is double-spaced, it is not necessary to consider the problem of excessive current delay rise due to the RL time constant in the stator coil.

5 is an explanatory diagram of the operation state of the double speed mode of the switched reluctance motor according to the present invention. When the current starts to flow in the B-phase coil by turning on the A-phase position sensor, the rotor has an inertial force during the current time constant time. It moves to the position of FIG.

At this time, the rotor generates the rotational force by the B-phase current reached, and the C-phase position sensor is turned on at the same time.

During the current rise time constant time of the C-phase coil, the rotor moves to the position of FIG. 5B by the effective current of the B-phase coil.

At this time, the B-phase position sensor is activated so that a current flows through the C-phase coil, and the rotor moves to the position of FIG.

At this time, the C-phase coil current rises to an effective value and moves to the position of FIG. 5A.

Here, when the phase-phase position sensor is turned on and current flows in the A-phase coil, the rotor moves to the position of FIG. 5B during the current rising time constant. Move to position (C).

Then, the drive speed of the switched reluctance motor is made according to the continuous repetition of the operation.

As described above, the present invention can overcome the limitation of increasing the motor speed by increasing the cogging force of the rotor due to the transient phenomenon caused by the electrical time constant when driving the switched reluctance motor.

Claims (3)

In the reluctance motor of the 6/4 system which consists of a stator in which the series coils of the A, B and C phases are wound on six poles and a four-pole rotor disposed in the stator, (1) The magnetic field of the A, B and C phase coils is detected to determine the positions of the A, B and C phases. Sensing; (2) by the position detection signal on the A-C detected in the step (1) On-controlling transistors Qc ', Qa', Qb 'driving the phase; (3) When the transistor Qa 'is turned on in the step (2), Through the double speed mode terminal (b), current is selectively supplied to the A phase coil and the C phase coil, respectively. Supplying; (4) When the transistor Qb 'is turned on in the step (2), the normal mode terminal (a) and Through the double speed mode terminal (b), current is selectively supplied to the B phase coil and the A phase coil, respectively. Supplying; (5) When the transistor Qc 'is turned on in the step (2), Through the double speed mode terminal (b), current is selectively supplied to the C phase coil and the B phase coil, respectively. Supplying; (6) Detect the number of revolutions of the rotor and compare the detected number of revolutions with the reference set value. Alternating steps; (7) When the rotation speed of the rotor in the step (6) is less than the reference setting value (3)-(5) Switching each terminal (a, b) at the step of) to the double speed mode terminal (b) at the same time A double speed drive control method for a switched reluctance motor, characterized in that it comprises a. A reluctance motor of a 6/4 system comprising a stator wound with series coils of A, B and C phases wound on six poles and a four-pole rotor disposed in the stator. A, B, and C position detection sensors (Sa, Sb, Sc) arranged at equal intervals on six poles to detect the magnetic field; The first to third gate circuits Gc, Ga, which are triggered by the respective position sensing signals of the AC phase position sensors Sa, Sb, and Sc to turn on the transistors Qc ', Qa', and Qb '. Gb); A first contact point SW ₁ for selectively supplying current to the A-phase coil and the C-phase coil through the normal mode terminal a and the double speed mode terminal b when the transistor Qa 'is turned on, and the transistor A second contact SW ₂ for selectively supplying current to the B-phase coil and the A-phase coil through the normal mode terminal a and the double speed mode terminal b when Qb 'is turned on, and the transistor QC. A third contact SW ₃ selectively supplying current to the C-phase coil and the B-phase coil through the normal mode terminal a and the double speed mode terminal b when ') is turned on; A relay 50 for simultaneously switching the terminals a and b of the _{first to third} contacts SW _{1 to} SW ₃ ; And a speed detecting unit 60 detecting the rotation speed of the rotor and generating a control signal for driving the relay 50 when the rotation speed of the rotor is equal to or greater than a reference set value. Double speed drive circuit of a switched reluctance motor comprising a. The speed detecting unit 60 includes a sensor 61 for detecting the slits 22 of the rotating plate 21 synchronized with the rotation of the rotor, and a count 62 for counting the slits detection signal pulses by the sensor 61. ), The down sampler 63 generating the rotor speed value from the count of the counter 62, and the output value of the down sampler 63 and the reference speed set value are compared, and the rotor speed is set to the normal mode. Switched reuck, characterized in that it comprises a comparator (64) for outputting a signal when intruded, and a gate circuit (66) triggered by the output of the comparator (64) to generate a control signal for driving the relay (50). Double speed drive control circuit of the traction motor.