KR102226615B1 - Operation method of motor system comprising switched reluctance motor - Google Patents

Abstract

A motor system including an SR motor and a method of operating the same are disclosed. A method of operating a motor system including a switched reluctance motor according to an exemplary embodiment of the present disclosure includes driving the switched reluctance motor based on a set frequency and rotation direction, and when an abnormal situation occurs, the switched reluctance motor And braking the switched reluctance by simultaneously exciting at least two of the plurality of coils wound on the plurality of protrusions of the stator.

Description

Operation method of motor system comprising switched reluctance motor

The technical idea of the present disclosure relates to a method of operating a motor system including a switched reluctance motor (hereinafter, referred to as'SR motor'), and more particularly, to a method of controlling braking of an SR motor.

SR motors are motors that generate rotational force using torque generated by changes in reluctance. SR motors have high performance and high durability, and have received wide interest in recent years due to their simple structure, and can be used as a driving device for various household appliances such as washing machines, refrigerators, air conditioners, and cookers, various transportation machines, and medical equipment. When a failure occurs in the SR motor, the SR motor rotates in the reverse direction, or when the lid of the device in which the SR motor is mounted is opened, the SR motor is required to be braked quickly.

A problem to be solved by the technical idea of the present disclosure is to provide a method of braking an SR motor quickly and safely.

A motor system including a switched reluctance motor according to the technical idea of the present disclosure includes driving the switched reluctance motor based on a set frequency and rotation direction, and when an abnormal situation occurs, a plurality of stators of the switched reluctance motor And braking the switched reluctance by simultaneously exciting at least two of the plurality of coils wound around the protruding poles of the.

According to the method of operating a motor system including an SR motor according to the technical idea of the present disclosure, when controlling the braking of the SR motor, by generating a restraining force on the rotor of the SR motor, the rotor is prevented from rotating backward, so that the rotor is fast. It can be braked safely. In addition, since the regenerative current is guided to the winding coil and flows as a circulating current, regenerative power is consumed quickly and expensive regenerative resistance is not required, so that cost can be reduced.

1 is a block diagram showing an SR motor system according to an exemplary embodiment of the present disclosure.
2A and 2B are diagrams illustrating a structure and basic operating principle of an SR motor according to an exemplary embodiment of the present disclosure.
3 is a diagram illustrating a configuration of an SRM driver according to an exemplary embodiment of the present disclosure.
4 is a diagram illustrating an excitation order of coils for driving an SR motor according to an exemplary embodiment of the present disclosure.
5 is a diagram illustrating waveforms of switching signals for driving an SR motor according to an exemplary embodiment of the present disclosure.
6 is a diagram illustrating an excitation sequence according to a braking control method of an SR motor according to an exemplary embodiment of the present disclosure.
7 is a diagram illustrating waveforms of switching signals for braking control of an SR motor according to an exemplary embodiment of the present disclosure.
8 is a diagram illustrating a braking principle of an SR motor according to an exemplary embodiment of the present disclosure.
9 is a diagram illustrating an excitation sequence according to a braking control method of an SR motor according to an exemplary embodiment of the present disclosure.
10 is a diagram illustrating waveforms of switching signals for braking control of an SR motor according to an exemplary embodiment of the present disclosure.
11 is a flowchart illustrating a method of operating an SR motor system according to an exemplary embodiment of the present disclosure.
12 is a flowchart illustrating a method of operating an SR motor system according to an exemplary embodiment of the present disclosure.

Hereinafter, embodiments of the technical idea of the present disclosure will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and redundant descriptions thereof are omitted.

1 is a block diagram illustrating an SR motor system according to an exemplary embodiment of the present disclosure, and FIGS. 2A and 2B are diagrams illustrating a structure and a basic operation principle of an SR motor according to an exemplary embodiment of the present disclosure.

Referring to FIG. 1, the SR motor system 10 may include an SR motor 110, an SR motor driver 120 (hereinafter referred to as an SRM driver), a position sensor unit 130, and a drive controller 140. have. The SR motor driver 120, the position sensor unit 130, and the driving controller 140 may be referred to as a driving circuit for driving the SR motor 110.

The SR motor 110 may obtain a rotational force by using a reluctance torque generated according to a change in magnetoresistive resistance. Referring to FIG. 2A, the SR motor 110 may include a stator 11 and a rotor 12. The stator 11 and the rotor 12 may be composed of magnetic materials having high magnetic permeability, and may have, for example, a structure in which a silicon steel plate is laminated. The SR motor 110 may have a double salient pole structure in which both the stator 11 and the rotor 12 have a salient pole structure. The stator 11 and the rotor 12 each include a plurality of silent-poles. A coil 13 is wound around the protruding poles of the stator 11. The shaft of the SR motor 110 is connected to the center of the rotor 12, and a sensing magnet rotating at the same time as the rotor 12 may be mounted on the shaft or the rotor 12.

The SR motor 110 according to the embodiment of the present disclosure may have a four-phase motor structure. The stator 11 of the SR motor 110 includes 8 protruding poles (e.g., A pole, B pole, C pole, D pole, A'pole, B'pole, C'pole, D'pole), The rotor 12 may include six protruding poles. Coils are wound around the protruding poles of the stator 11 facing each other. In FIG. 2A, it is shown that the coil 13 is wound around the A pole and A'pole, but this is for convenience of explanation, and the A pole and A'pole, the B pole and the B'pole, the C pole and the C'pole, A phase coil, B phase coil, C phase coil, and D phase coil may be wound on the D and D'poles, respectively.

2A and 2B, when a voltage is applied to both ends of the coil 13 (that is, the winding), that is, when the coil 13 is energized and current flows through the coil 13, the coil 13 is wound. The protruding poles are excited, and a magnetic flux is generated in a direction orthogonal to the direction of the current. For example, depending on the winding direction of the coil 13 wound on the A and A'poles, when the current I flows from the right to the left of the A pole, the A pole and the A'pole are excited and are orthogonal to the current (I). The magnetic flux is generated in the direction of F1. Hereinafter, in the present disclosure, the expression that the protrusion is excited will be used in the same way as the meaning that the coil 13 wound around the protruding electrode is energized to be excited.

As the magnetic flux passes through the rotor 12, a current is generated in the rotor 12, and torque is generated as the magnetic flux of the stator 11 and the magnetic flux of the rotor 12 are linked. That is, torque may be generated by magnetic attraction force acting between the stator 11 and the rotor 12. A voltage is sequentially applied to the coils of the A phase, B phase, C phase, and D phase, and the phase current flows, so that the rotor 12 may rotate.

With continued reference to FIG. 1, the SRM driver 120 (or referred to as an SRM inverter) converts the DC voltage to the coils of the SRM motor 110 (eg, A phase, B phase, C phase and D-phase coils) can be applied to each. The SR motor system 10 may further include a converter (not shown) that rectifies the input commercial AC power to DC power (ie, DC voltage), and the SRM driver 120 converts the DC voltage provided from the converter to SRM. It can be applied to the coils of the motor 110.

The SRM driver 120 may include switching elements (Q1 to Q6 in FIG. 3 to be described later), and the switching elements are'turned on' or'turned off' in response to switching signals SSWs to Voltage can be applied to the field. In addition, the SRM driver 120 may output sensing signals Ssen for sensing the state of the SR motor 110, for example, sensing signals Ssen for sensing current, temperature, voltage, and the like.

The position sensor unit 130 provides position sensing signals PSS1 and PSS2 corresponding to the angular position of the rotor 12. In an embodiment, the position sensor unit 130 may include a plurality of Hall sensors disposed adjacent to the sensor magnet. For example, the position sensor unit 130 may include a first Hall sensor 131 and a second Hall sensor 132. The first Hall sensor 131 and the second Hall sensor 132 detect a magnetic signal of the sensor magnet when the rotor 12 rotates, and the first position sensing signal SS1 and the second position sensing signal SS2 are respectively ) Can be printed.

The driving controller 140 may generate switching signals SSWs and provide the switching signals SSWs to the SRM driver 120. The driving controller 140 is a control signal (Ctrl) (for example, a control signal for setting a rotation direction, speed command and/or torque command according to a user input or a preset driving algorithm), provided from the position sensor unit 130. Switching signals SSWs may be generated based on at least one of the position sensing signals PSS1 and PSS2 and the sensing signals Ssen provided from the SRM driver 120.

The driving controller 140 may generate switching signals SSWs for driving the SR motor 110 according to a set rotation direction and speed. In an embodiment, the driving controller 140 detects the rotational speed of the SR motor 110 based on the position sensing signals PSS1 and PSS2, and based on the sensing signal Ssen output from the SRM driver 120. As, the amount of current flowing through the coils of the SRM motor 110 can be detected, and the SRM motor 110 based on the difference between the target speed according to the speed command and the rotation speed of the SR motor 110 (that is, the current speed). In order to increase or decrease the amount of current flowing through the coils of the switching signals SSWs, the duty ratio of the switching signals SSWs may be adjusted.

In addition, when an abnormal situation occurs while driving the SR motor 110, the driving controller 140 may generate switching signals SSWs for braking the SR motor 110. The drive controller 140 generates switching signals (SSWs) for emergency braking of the SR motor 110 when detecting an external braking request signal or an abnormal situation (eg, detecting an abnormal level of reverse rotation, voltage or current). can do.

In an embodiment, the driving controller 140 may be implemented as a microcontroller (or microcomputer). However, the driving controller 140 is not limited thereto, and the driving controller 140 includes a CPU (Central Processing Unit), a processor, a DSP (Digital Signal Processing), an application processor (AP), a microcontroller unit (MCU), or a mini computer. The same can be implemented in various forms.

The driving controller 140 may include a Pulse Width Modulation (PWM) signal generator 141, and the PWM signal generator 141 may generate PWM signals and provide the PWM signals as switching signals SSWs. . The PWMW signal generator 141 may generate PWM signals, that is, switching signals SSWs, based on the position sensing signals PSS1 and PSS2, and may generate a control signal Ctrl and sensing signals Ssen. As a basis, the duty ratio of the PWM signal can be adjusted.

3 is a diagram illustrating a configuration of an SRM driver according to an exemplary embodiment of the present disclosure. For convenience of explanation, an equivalent circuit 10' representing the coils wound in the SR motor (10 in FIG. 1) is shown together. The equivalent circuit 10' includes four-phase coils La, Lb, Lc, and Ld wound around the stator 11.

The SRM driver 120 may include a capacitor C1, switching elements Q1 to Q6, and a plurality of diodes D1 to D6. In an embodiment, the switching elements Q1 to Q6 may be implemented as an Insulated Gate Bipolar Transistor (IGBT), a Field Effect Transistor (FET), a Bipolar Junction Transistor (BJT), or the like.

The capacitor C1 is a DC link capacitor, which is connected to the first input node Ip and the second input node In (i.e., DC link), and is received through the first and second input nodes Ip and In. DC voltage (Vdc) can be stably provided.

The first switching element Q1 and the first diode D1 are connected to one end of the A-phase coil La (terminal in the direction of the A pole) and one end of the C-phase coil Lc through the first node N1. It is electrically connected to the terminal in the direction of the C pole). The second switching element Q2 and the second diode D2 are connected to the other end (terminal in the direction of the A'pole) of the phase A coil La through the second node N2, and the third switching element Q3 ) And the third diode D3 are electrically connected to the other end (terminal in the direction of the C'pole) of the C-phase coil Lc through the third node N3. The fourth switching element Q4 and the fourth diode D4 are connected to one end of the B-phase coil Lb (terminal in the direction of the B pole) and one end of the D-phase coil Ld through the fourth node N4. It is connected to the terminal in the direction of the D pole). The fifth switching element Q5 and the fifth diode D5 are connected to the other end (terminal in the direction of the B'pole) of the B-phase coil Lb through the fifth node N5, and the sixth switching element Q6 ) And the sixth diode D6 are connected to the other end (a terminal in the direction of the D'pole) of the D-phase coil Ld through the sixth node N6.

The A-phase coil (La) and the C-phase coil (Lc) may share the first switching element (Q1) and the first diode (D1), the B-phase coil (Lb) and the D-phase coil (Ld) is a fourth The switching element Q4 and the fourth diode D4 may be shared. By applying such a switching element sharing method, the number of switching elements and diodes for driving the SR motor 110 may be reduced, and the circuit size of the SRM driver 120 may be reduced.

The switching elements Q1 to Q6 perform a switching operation of'turn-on' or'turn-off' in response to a corresponding switching signal among the switching signals S1H, S1L1, S1L2, S2H, S2L1, and S2L2. , A voltage may be applied to the coils La, Lb, Lc, and Ld. Each of the A-phase, B-phase, C-phase, and D-phase coils (La, Lb, Lc, Ld) may be energized when the switching elements connected to both ends are'turned on'. The switching operation of the switching elements Q1 to Q6 will be described in more detail with reference to FIG. 5.

After the voltage is applied to the coils La, Lb, Lc, and Ld, the plurality of diodes D1 to D6 reflux the counter EMF generated when the switching elements Q1 to Q6 are'turned off'. I can make it.

Meanwhile, the SRM driver 120 may further include a sensing unit SU for sensing the state of the SR motor 110. For example, as shown, the sensing unit SU may further include a resistor Rsen for detecting an amount of current flowing through the DC link. When the sensing voltages Vsen at both ends of the resistor Rsen are provided as sensing signals to the driving driver (140 in FIG. 1), the driving driver 140 calculates the sensing voltages Vsen and the resistance values of the resistance Rsen. Based on the current amount (phase current) can be detected.

4 is a diagram illustrating an excitation order for driving an SR motor according to an exemplary embodiment of the present disclosure. Illustratively, an embodiment in which the rotor 12 rotates in a clockwise direction is shown.

As described above with reference to FIGS. 2A and 2B, the protruding poles of the stator 11 can be excited by energizing the coils wound around the protruding poles, and when the protruding poles of the stator 11 are sequentially excited in a counterclockwise direction, The rotor 12 can rotate clockwise. For example, as the first step (step1), the second step (step2), the third step (step3), and the fourth step (Step4) are sequentially performed, the protruding poles of the stator 11 are sequentially energized in a counterclockwise direction. Accordingly, it can be seen that the protruding pole of the rotor 12 of the rotor 12, for example, the first protruding pole P1 rotates in a clockwise direction.

In the first step, the A pole and the A'pole of the stator 11 are excited, and magnetic force lines are generated as shown in the illustrated direction. The first protrusion P1 adjacent to the A pole of the stator 11 is aligned with the A pole of the stator 11 by magnetic attraction force. In the second step, the B pole and the B'pole are excited, and in the first step, the protruding pole of the rotor 12, which was closest to the B pole of the stator 11, is aligned with the B pole. Accordingly, the first protrusion P1 may rotate 15 degrees. Thereafter, when the C pole and C'pole are excited in the third step, and the B pole and B'pole are excited in the fourth step, the first protrusion P1 may rotate by 15 degrees in each step. As the first to fourth steps proceed in sequence, the rotor 12 may rotate 60 degrees clockwise, and if the first to fourth steps are performed six times, the rotor 12 is rotated 360 degrees. In other words, you can rotate the day. For example, if the first to fourth steps are performed 6 times for 1 second, that is, when the coils are energized at 6 Hz, the rotor 12 may rotate 60 times for 1 minute. In the SR motor 110, a frequency of 6 Hz means 60 RPM (Revolution Per Minute).

On the other hand, contrary to the above, when the protruding poles of the stator 11 are excited in a clockwise direction, that is, when the fourth step, the third step, the second step, and the first step are sequentially performed, the rotor 12 is counterclockwise. Can rotate in any direction.

5 is a diagram illustrating waveforms of switching signals for driving an SR motor according to an exemplary embodiment of the present disclosure.

5 shows switching signals S1H, S1L1, S1L2 of the SRM driver (120 in FIG. 3) for controlling the rotor 12 of the SR motor 110 to rotate clockwise as shown in FIG. S2H, S2L1, S2L2) waveforms are shown. As described above with reference to FIG. 1, the switching signals S1H, S1L1, S1L2, S2H, S2L1, and S2L2 may be generated by the PWM signal generator (141 of FIG. 1). It will be described with reference to FIG. 3 together.

The PWM signal generator (141 in FIG. 1) divides the section P1 to P4 based on the combination of the position sensing signals PSS1 and PSS2, and the switching signals S1H, S1L1, S1L2, S2H, S2L1 in the P1 to P4 section. , S2L2) can be created. The position sensing signals PSS1 and PSS2 may have a first level, such as a logic high and a second level, such as a logic low. In an embodiment, the first level section and the second level section of the location sensing signals PSS1 and PSS2 may be the same, and in one period (eg, P1 to P4 section), the first location sensing signal The (PSS1) and the second position sensing signal (PSS2) may have a phase difference of 90 degrees.

First, the S1H signal and the S1L1 signal may be generated in the P1 section. In this disclosure, generating a signal means that the signal transitions to an active level. Accordingly, the first switching element Q1 and the second switching element Q2 are'turned on' so that the A-phase coil La may be energized. Current may flow through the first switching element Q1, the A-phase coil La, and the second switching element Q2.

On the other hand, when the first switching element Q1 and the second switching element Q2 are'pull-on' during the P1 period, not only an excessive amount of current flows in, but also it is difficult to control the amount of current. On the other hand, when'turn-on' and'turn-off' of the first and second switching elements Q1 and Q2 are repeated in the period P1, that is, repeatedly switched, the amount of current can be adjusted. . However, when both the first and second switching elements Q1 and Q2 are repeatedly switched, switching loss may occur. Accordingly, the second switching element Q2 is'full-on' and the first switching element Q1 repeatedly switches, so that the amount of current can be adjusted. Therefore, in the period P1, the second switching element Q2 is at an active level that controls'full-on', for example, a S1L1 signal having a logic high and a pulse width modulated S1H that controls the first switching element Q1 to be switched. A signal can be generated. Similarly, one of the two switching signals for controlling the switching elements to be'turned-on' even in other periods, that is, periods P2, P3, and P4, may be generated as a pulse width modulated signal.

The S2H signal and the S2L1 signal may be generated in the P2 section, and in response to the S2H signal and the S2L1 signal, the fourth switching element Q4 and the fifth switching element Q5 are'turned-on' and thus the D-phase coil Ld ) Can be energized. The S1H signal and the S1L2 signal may be generated in the P3 section, and in response to the S1H signal and the S1L2 signal, the first switching element Q1 and the third switching element Q3 are'turned-on' and the C-phase coil Lc ) Can be energized. In addition, the S2H signal and the S2L2 signal may be generated in the P4 section, and in response to the S2H signal and the S2L2 signal, the fourth switching element (Q4) and the sixth switching element (Q6) are'turned-on' to form a phase B coil. (Lb) can be energized.

In this way, switching signals S1H, S1L1, S1L2, S2H, S2L1, S2L2 are generated in the period P1 to P4, and the switching signals S1H, S1L1, S1L2, S2H, S2L1, S2L2 are the switching elements ( By being applied to Q1 to Q6), the four-phase coils (La, Lb, Lc, Ld) wound on the protruding poles of the stator 11 are energized in a counterclockwise direction, and the rotor 12 is rotated in a clockwise direction. I can. The current flowing through each of the four-phase coils La, Lb, Lc, and Ld may be referred to as a phase current or an excitation current.

6 is a diagram illustrating an excitation sequence according to a braking control method of an SR motor according to an exemplary embodiment of the present disclosure.

Referring to FIG. 6, among the protrusions of the stator 11, non-adjacent protrusions may be simultaneously excited. For example, in the first step (step1), the A pole and the A'pole, and the C pole and the C'pole are simultaneously excited, and in the second step (step2), the B pole and the B'pole, and the D pole and D' The play can be excited at the same time. The first step and the second step may be repeatedly performed, and accordingly, the rotating rotor 12 may stop.

7 is a diagram illustrating waveforms of switching signals for braking control of an SR motor according to an exemplary embodiment of the present disclosure.

During braking control, the switching signals S1H, S1L1, S1L2, S2H, S2L1, and S2L2 may be generated irrespective of the position sensing signals (PSS1 and PSS2 in FIG. 5). That is, during braking control, the PWM signal generator (141 in FIG. 1) is based on the reference signal having a preset frequency regardless of the rotation speed of the rotor 12, switching signals S1H, S1L1, S1L2, S2H, S2L1 , S2L2) can be created.

Referring to FIG. 7, the S1H signal and the S2H signal may have an active level in the entire period, for example, in the P1 to P4 period. However, as described above, a pulse width modulated signal for current control may be generated as an S1H signal and an S2H signal. For example, the S1H signal and the S2H signal may have a frequency of 20 KHz or less, and the pulse width duty ratio of the S1H signal and the S2H signal may be 5% or less. Other switching signals S1L1, S1L2, S2L1, and S2L2 may be signals having a fixed low frequency (ie, Freq_fix). In an embodiment, the frequency may be 0.01 Hz or less. The S1L1 signal and the S1L2 signal may be generated in the same section, for example, the P2 section and the P4 section, and the S2L1 and S2L2 signals may be generated in the same section, such as the P1 section and the P3 section. For example, the PWM signal generator (141 in FIG. 1) is the switching signals S1H, S1L1, S1L2, S2H, S2L1, as shown based on a reference signal or a clock signal having a fixed frequency (for example, around 20 KHz). S2L2) can be created.

Referring to FIG. 3 together, in response to the S2H signal, the S2L1 signal, and the S2L2 signal, the fourth to sixth switching elements Q4, Q5, and Q6 may be'turned on' in the period P1 and the period P3. , Accordingly, as shown in the second step of FIG. 6, the B pole and the B'pole, and the D pole and the D'pole can be simultaneously excited. In addition, in the period P2 and the period P4, in response to the S1H signal, the S1L1 signal, and the S1L2 signal, the first to third switching elements Q1, Q2, and Q3 may be'turned-on', and accordingly, FIG. As shown in the first step of 6, the A pole and the A'pole, and the C pole and C'pole can be excited at the same time.

8 is a diagram illustrating a braking principle of an SR motor according to an exemplary embodiment of the present disclosure.

Referring to FIG. 8, while the rotor 12 rotates in a clockwise direction (CW), when non-adjacent protrusions among the protrusions of the stator 11 are simultaneously excited, the direction in which the protrusions of the rotor 12 are rotated. And a suction force may act from the opposite direction. For example, when the B pole and the B'pole, and the D pole and the D'pole are excited at the same time, both the B pole and the D pole may have the same polarity, for example, the N pole. The first protrusion P1 of the rotor 12 may be an S-pole, and a first suction force SF1 acts on the first protrusion P1 from the B pole located in the rotation direction, and in the opposite direction to the rotation direction. The second suction force SF2 may act from the position D. Accordingly, the torque of the rotor 12 is weakened, and the rotor 12 may stop.

According to the conventional braking method, for braking the SR motor, a torque can be generated in a direction opposite to the direction in which the rotor 12 rotates. For example, when the SR motor rotates, when the rotor 12 rotates clockwise as the protruding poles of the stator 11 are excited in a counterclockwise direction, when the SR motor is braking, the protruding poles of the stator 12 are clockwise. As it is excited in the direction, torque may be generated in a direction opposite to the rotational direction of the rotor 12. That is, the suction force does not occur in the front side in the rotation direction of the rotor 12, but the suction force is generated in the rear side, thereby generating reverse torque, and thus the rotor 12 may stop. However, according to this braking method, the rotor 12 may rotate reversely due to the reverse torque, and the DC voltage (Vdc in FIG. 3) of the SRM driver 120 increases due to the power regenerated by the reverse rotation. Problems can arise. In order to prevent an increase in DC voltage, a regenerative resistor and a power semiconductor for consuming electrical energy as thermal energy are provided in the SRM driver 120, and the regenerative resistor may consume electrical energy as thermal energy through switching of the power semiconductor. However, the cost may increase due to the addition of a regenerative resistor and a power semiconductor.

However, according to the braking method according to the embodiment of the present disclosure, since suction force is generated at the front and rear sides of the rotation direction of the rotor 12, a restraining force is generated instead of a reverse torque, so that the rotor 12 rotates in reverse. Can be prevented. Thus, the rotor 12 can be stopped quickly and safely. In addition, as shown in FIG. 7, the S1H signal and the S2H signal have an active level in all sections, and accordingly, the first switching element (Q1 in FIG. 1) and the fourth switching element Q4 respectively correspond to the corresponding coils. Even in this non-energized section, it is'turned-on', so that the regenerative current can be induced to the coil to be energized again. As the regenerative current flows as a circulating current in this way, the regenerative power can be quickly consumed.

9 is a diagram showing an excitation sequence according to a braking control method of an SR motor according to an exemplary embodiment of the present disclosure, and FIG. 10 is a waveform diagram of switching signals for braking control of an SR motor according to an exemplary embodiment of the present disclosure. It is a drawing showing.

Referring to FIG. 9, for braking of the rotor 12 of the SR motor 110, all the protrusions of the stator 11 may be simultaneously excited. Accordingly, the rotating rotor 12 may stop. That is, coils wound on the A and A'poles, B and B'poles, C and C'poles, and D and D'poles can be simultaneously energized.

Referring to FIG. 10, during braking control, switching signals S1H, S1L1, S1L2, S2H, S2L1, and S2L2 may be generated regardless of position sensing signals (PSS1 and PSS2 in FIG. 5). That is, during braking control, the PWM signal generator (141 in FIG. 1) may generate switching signals S1H, S1L1, S1L2, S2H, S2L1, and S2L2 regardless of the rotation speed of the rotor 12.

The S1H signal and the S2H signal may have an active level in the entire period, for example, in the P1 to P4 period. However, as described above, a pulse width modulated signal for current control may be generated as an S1H signal and an S2H signal. As a non-limiting example, the S1H signal and the S2H signal have a frequency of 20 KHz, and the duty ratio of the pulse width may be 5% or less. All of the other switching signals S1L1, S1L2, S2L1, and S2L2 may be turned on (eg, logic high (H)). A pole and A'pole, B pole and B'pole, C pole and C'pole, and D pole and D'pole, that is, as all the protruding poles of the stator 110 are excited at the same time, the binding force to the rotor 120 Since this occurs, the rotor 120 may stop.

11 is a flowchart illustrating a method of operating an SR motor system according to an exemplary embodiment of the present disclosure. This embodiment can be applied to the SR motor system 10 of FIG. 1.

Referring to FIG. 11, the SR motor system 10 may prepare to drive the SR motor 110 (S110). For example, the SR motor system 10 may set a rotation direction, a speed, and a torque based on an external control signal such as a user input and/or an internal control signal generated based on a preset driving algorithm.

The SR motor system 10 may drive the SR motor 110 according to the above setting (S120). As described above, based on the operation of the driving controller 140, the SRM driver 120, and the position sensor unit 130, the rotor 110 of the SR motor 110 may rotate in a clockwise or counterclockwise direction. I can.

The SR motor system 10 may determine whether an abnormal situation occurs while driving the SR motor 110 (S130). In the embodiment, when a product in which the SR motor system 10 is mounted, for example, a mixer, a cooker, etc., occurs during the operation of the SR motor 110, the product cover is opened, the main controller of the product And provide a signal for occurrence of an abnormal situation to the SR motor system 10. In an embodiment, the driving controller 140 is configured when the voltage level of a voltage provided from the outside or a voltage generated internally exceeds the maximum threshold level or is less than the minimum threshold level, or the amount of current exceeds the maximum threshold amount or the minimum threshold amount. If it is less than, it can be determined that an abnormal situation has occurred.

If an abnormal situation does not occur, the SR motor system 10 may continuously drive the SR motor 110 and, upon detecting the occurrence of the abnormal situation, may perform emergency braking (S140). The SR motor system 10, that is, the drive controller 140 and the SRM driver 120, may perform emergency braking according to the braking method according to embodiments of the present disclosure described with reference to FIGS. 6 to 10. .

The SR motor system 10 may determine whether the abnormal situation has been resolved (S150). For example, the main controller of the product on which the SR motor system 10 is mounted may confirm that the cover of the product is closed, and may provide a signal for resolving an abnormal situation to the SR motor system 10.

When the SR motor system 10 determines that the abnormal situation has been resolved, it returns to step S110, prepares for driving of the SR motor 110, and performs the following steps to restart the SR motor 110. have.

When the SR motor system 10 determines that the abnormal situation has not been resolved, the driving of the SR motor 110 may be terminated. In an embodiment, the SR motor system 10 checks whether the abnormal situation is not resolved within a predetermined time or whether the abnormal situation is resolved a plurality of preset times at predetermined time intervals, and if the abnormal situation is not resolved, the SR motor 110 ) Can be terminated (S160).

12 is a flowchart illustrating a method of operating a driving system for an SR motor according to an exemplary embodiment of the present disclosure. This embodiment can be applied to the SR motor system 10 of FIG. 1.

Referring to FIG. 12, the SR motor system 10 may prepare to drive the SR motor 110 (S210 ). The driving system 10 may set a rotation direction, a speed, and a torque based on an external control signal such as a user input and/or an internal control signal generated based on a preset driving algorithm.

The SR motor system 10 may drive the SR motor 110 according to the above setting (S220).

When driving the SR motor, the SR motor system 10 may detect whether it rotates in the reverse direction (S230). For example, by detecting whether the driving controller 140 rotates in the reverse direction based on the position sensing signals PSS1 and PSS2 provided from the position sensor unit 130, it is possible to determine whether an abnormal situation has occurred.

If the reverse rotation does not occur, the SR motor system 10 may continuously drive the SR motor 110 and, upon detection of the occurrence of the reverse rotation, may perform emergency braking (S240). The SR motor system 10 may perform emergency braking according to the braking method according to embodiments of the present disclosure described with reference to FIGS. 6 to 10.

The SR motor system 10 may determine whether the SR motor 110, that is, the rotor 120 of the SR motor 110 is stopped (S250). For example, the driving controller 140 may determine whether the rotor 120 is stopped based on the position sensing signals PSS1 and PSS2 provided from the position sensor unit 130.

If the rotor 120 has not stopped, the SR motor system 10 continues to perform emergency braking, and if it is determined that the rotor 120 has stopped, it returns to step S210 and prepares for driving the SR motor 110 By performing the following steps and performing the following steps, it is possible to restart the SR motor 110.

The SR motor system 10 according to an exemplary embodiment of the present disclosure may be mounted on a product such as a mixer or a cooker that performs a stirring function on a cooking material, and as described with reference to FIGS. 11 and 12, the SR motor Emergency braking can be performed when an abnormal situation occurs, such as when the cover of the product is removed during the operation or when the rotor 12 rotates in reverse.

The SR motor system 10 may perform emergency braking according to the braking method according to embodiments of the present disclosure described with reference to FIGS. 6 to 10. Accordingly, by stopping the SR motor 110 quickly and reliably, the occurrence of a safety accident can be prevented, and the SR motor system (10 in FIG. 1) can be implemented at low cost.

As described above, exemplary embodiments have been disclosed in the drawings and specification. In the present specification, embodiments have been described using specific terms, but these are only used for the purpose of describing the technical idea of the present disclosure, and are not used to limit the meaning or the scope of the present disclosure. Therefore, those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Claims (7)

In the method of operating a motor system including a switched reluctance motor,
Driving the switched reluctance motor based on a set frequency and rotation direction; And
When an abnormal situation occurs, braking the switched reluctance motor by simultaneously exciting at least two of a plurality of coils wound around a plurality of protruding poles of the stator of the switched reluctance motor and forming different current paths. How to include. The method of claim 1,
Exciting at least two coils wound around protruding poles not adjacent to each other among the plurality of coils; And
And exciting at least two different coils wound around different protrusions not adjacent to each other among the plurality of coils. The method of claim 2, wherein the switched reluctance motor comprises a first-phase coil, a second-phase coil, a third-phase coil, and a fourth coil wound around eight protruding poles and two protruding poles facing each other among the eight protruding poles. Includes a phase coil,
The motor system simultaneously excites a first phase coil and a third phase coil wound on protruding poles that are not adjacent to each other, and simultaneously excites a second phase coil and a fourth phase coil wound on other protruding poles that are not adjacent to each other. Method characterized in that to let. The method of claim 1, wherein the motor system,
A method comprising generating switching signals for energizing the first to fourth phase coils based on a reference signal having a preset frequency. The method of claim 1, wherein the step of energizing the at least two coils,
And simultaneously exciting the plurality of coils. The method of claim 1, wherein the motor system,
And detecting the rotation direction of the rotor of the reluctance motor, and determining that the abnormal situation has occurred when the rotation direction is different from a preset rotation direction. The method of claim 1, wherein the motor system,
And determining that the abnormal condition has occurred based on an abnormal condition occurrence signal provided from a main controller of a product equipped with the motor system.

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