CN106602944B - Switch reluctance motor and braking circuit thereof - Google Patents
Switch reluctance motor and braking circuit thereof Download PDFInfo
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- CN106602944B CN106602944B CN201611059731.9A CN201611059731A CN106602944B CN 106602944 B CN106602944 B CN 106602944B CN 201611059731 A CN201611059731 A CN 201611059731A CN 106602944 B CN106602944 B CN 106602944B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
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Abstract
The invention belongs to the technical field of motor braking, and provides a switch reluctance motor and a braking circuit thereof. In the invention, by adopting the brake circuit comprising the first switch module, the second switch module, the time control module, the working voltage generation module and the brake direct current generation module, when the switch circuit connected with the brake circuit is in a first conduction state, the second switch module is in the first conduction state, so that the brake circuit is in a driving state; when the switch circuit is in a second conduction state, the first switch module enters the first conduction state, and the second switch module enters the second conduction state, so that the brake circuit enters a brake state, and further, the switch reluctance motor is braked, different brake time can be set by the brake circuit according to actual needs, the safety and the reliability are high, and the problem that the human body or equipment adopting the SRM is easily damaged due to long brake time consumption in the conventional SRM is solved.
Description
Technical Field
The invention belongs to the technical field of motor braking, and particularly relates to a switch reluctance motor and a braking circuit thereof.
Background
The rotor of the switch reluctance motor (Switched Reluctance Motor, SRM) is formed by laminating common silicon steel sheets, has the advantages of simple and reliable structure, low cost, high power factor and the like, and the rotor does not need to be provided with permanent magnets when the SRM does not need to be subjected to brush phase change, so that the SRM has good development prospect.
However, in some application occasions of the SRM, for example, when the equipment using the SRM needs to be braked rapidly in case of emergency, so as to prevent damage to human body or the equipment using the SRM, since the SRM rotor has no permanent magnet and no cogging torque, if the SRM needs to stop at a high speed, the SRM can only brake by means of the friction force of the rotor shaft, and the process takes a long time, which is very easy to cause damage to human body or the equipment using the SRM.
In summary, the conventional SRM has a problem in that a human body or a device using the SRM is easily damaged due to a long brake time.
Disclosure of Invention
The invention aims to provide a switch reluctance motor and a braking circuit thereof, which aim to solve the problem that the prior SRM is extremely easy to damage due to long braking time.
The present invention is achieved by a brake circuit of a switched reluctance motor, the brake circuit being connected to a switch circuit, the switched reluctance motor, and a driver connected to a first winding and a second winding of the switched reluctance motor, the brake circuit comprising:
the device comprises a first switch module, a second switch module, a time control module, a working voltage module generating module and a braking direct current generating module;
the input end of the switching circuit is connected with a first interface of an external power supply, the first output end of the switching circuit is connected with the first input end of the driver, the second input end of the driver is connected with a second interface of the external power supply, and the second output end of the switching circuit is connected with the first input end of the working voltage generating module and the first input end of the braking direct current generating module; the second input end of the working voltage generating module is connected with the third interface of the external power supply and the second input end of the braking direct current generating module, and the output end of the working voltage generating module is connected with the first input end of the first switch module, the first input end of the time control module and the first input end of the second switch module; the first output end of the braking direct current generating module is connected with the second input end of the first switch module, and the second output end of the braking direct current generating module is connected with the second input end of the second switch module; the first output end of the first switch module is connected with the second input end of the time control module, and the second output end of the first switch module is connected with the third input end of the second switch module; the first output end of the second switch module is commonly grounded with the output end of the time control module, the fourth input end of the second switch module is connected with the first output end of the driver, the fifth input end of the second switch module is connected with the second output end of the driver, the second output end of the second switch module is connected with the first end of the third winding of the switch reluctance motor, and the third output end of the second switch module is connected with the second end of the third winding;
when the switch circuit is in a first conduction state, the second switch module enters the first conduction state so that a third winding of the switch reluctance motor is connected with the driver, and the driver receives alternating current input by the external power supply and drives the switch reluctance motor to operate according to the alternating current; when the switch circuit is in a second conduction state, the first switch module enters a first conduction state, the braking direct current generating module receives the alternating current and outputs the braking direct current to the first switch module according to the alternating current, and the first switch module outputs the braking direct current to the second switch module; the working voltage generating module receives the alternating current and outputs working voltage to the first switch module, the time control module and the second switch module according to the alternating current; the time control module works according to the working voltage, when the delay time of the time control module does not arrive, the first switch module maintains the first conduction state, the second switch module switches from the first conduction state to the second conduction state according to the working voltage and outputs the braking direct current to the third winding of the switched reluctance motor so that the switched reluctance motor starts to brake according to the braking direct current, and when the delay time of the time control module arrives, the first switch module switches from the first conduction state to the second conduction state according to the working voltage and stops outputting the braking direct current to the second switch module so that the switched reluctance motor stops braking.
Another object of the present invention is also to provide a switched reluctance motor comprising the braking circuit described above.
In the invention, by adopting the brake circuit comprising the first switch module, the second switch module, the time control module, the working voltage generation module and the brake direct current generation module, when the switch circuit connected with the brake circuit is in a first conduction state, the second switch module enters the first conduction state so as to enable the third winding of the switch reluctance motor to be connected with the driver, and the driver receives alternating current input by an external power supply and drives the switch reluctance motor to operate according to the alternating current; when the switch circuit is in a second conduction state, the first switch module enters the first conduction state, the braking direct current generating module receives alternating current and outputs braking direct current to the first switch module according to the alternating current, and the first switch module outputs the braking direct current to the second switch module; the working voltage generating module receives alternating current and outputs working voltage to the first switch module, the time control module and the second switch module according to the alternating current; the time control module works according to the working voltage, when the delay time of the time control module does not reach, the first switch module maintains a first conduction state, the second switch module switches from the first conduction state to a second conduction state according to the working voltage and outputs braking direct current to a third winding of the switched reluctance motor, so that the switched reluctance motor starts to brake according to the braking direct current, when the delay time of the time control module reaches, the first switch module switches from the first conduction state to the second conduction state according to the working voltage and stops outputting the braking direct current to the second switch module, so that the switched reluctance motor stops braking, different braking time can be set according to actual needs by a braking circuit, the safety reliability is high, and the problem that a human body or equipment adopting the SRM is extremely easy to damage due to long braking time consumption in the existing SRM is solved.
Drawings
FIG. 1 is a schematic block diagram of a braking circuit of a switched reluctance motor according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a braking circuit of a switched reluctance motor according to another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a braking circuit of a switched reluctance motor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The implementation of the invention is described in detail below with reference to the specific drawings:
fig. 1 shows a block structure of a braking circuit of a switched reluctance motor according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, and the following details are given:
as shown in fig. 1, a braking circuit 1 of a switched reluctance motor provided by an embodiment of the present invention is connected with a switching circuit 2, a switched reluctance motor 3 and a driver 4, wherein the driver 4 is connected with a first winding and a second winding of the switched reluctance motor 3.
Further, the braking circuit 1 further includes a first switch module 10, a second switch module 11, a time control module 12, an operating voltage generating module 13, and a braking direct current generating module 14.
Wherein the input end of the switch circuit 2 is connected with a first interface of an external power supply (not shown in the figure), the first output end of the switch circuit 2 is connected with a first input end of the driver 4, the second input end of the driver 4 is connected with a second interface of the external power supply, and the second output end of the switch circuit 2 is connected with a first input end of the working voltage generating module 13 and a first input end of the braking direct current generating module 14; the second input end of the working voltage generating module 13 is connected with the third interface of the external power supply and the second input end of the braking direct current generating module 14, and the output end of the working voltage generating module 13 is connected with the first input end of the first switch module 10, the first input end of the time control module 12 and the first input end of the second switch module 11; a first output end of the braking direct current generating module 14 is connected with a second input end of the first switch module 10, and a second output end of the braking direct current generating module 14 is connected with a second input end of the second switch module 11; a first output end of the first switch module 10 is connected with a second input end of the time control module 12, and a second output end of the first switch module 10 is connected with a third input end of the second switch module 11; the first output end of the second switch module 11 is commonly grounded to the output end of the time control module 13, the fourth input end of the second switch module 11 is connected to the first output end of the driver 4, the fifth input end of the second switch module 11 is connected to the second output end of the driver 4, the second output end of the second switch module 11 is connected to the first end of the third winding of the switched reluctance motor 3, and the third output end of the second switch module 11 is connected to the second end of the third winding.
Specifically, when the switch circuit 2 is in the first conductive state, the second switch module 11 enters the first conductive state, so that the third winding of the switched reluctance motor 3 is connected with the driver 4, and the driver 4 receives the alternating current input by the external power supply and drives the switched reluctance motor 3 to operate according to the alternating current; when the switch circuit 2 is in the second conducting state, the first switch module 10 enters the first conducting state, the braking direct current generating module 14 receives the alternating current and outputs the braking direct current to the first switch module 10 according to the alternating current, and the first switch module 10 outputs the braking direct current to the second switch module 11; the working voltage generating module 13 receives the alternating current and outputs working voltage to the first switch module 10, the time control module 12 and the second switch module 11 according to the alternating current; the time control module 12 operates according to the working voltage, when the delay time of the time control module 12 does not arrive, the first switch module 10 maintains the first conduction state, the second switch module 11 switches from the first conduction state to the second conduction state according to the working voltage, and outputs the braking direct current to the third winding of the switched reluctance motor 3, so that the switched reluctance motor 3 starts braking according to the braking direct current, and when the delay time of the time control module 12 arrives, the first switch module 10 switches from the first conduction state to the second conduction state according to the working voltage, and stops outputting the braking direct current to the second switch module 11, so that the switched reluctance motor 3 stops braking.
It should be noted that, in the embodiment of the present invention, the on state of the switch circuit 2, the on state of the first switch module 10, and the on state of the second switch module 11 will be described in detail in the following specific circuits, which are not described herein.
Further, as a preferred embodiment of the present invention, as shown in fig. 2, the brake circuit 1 further includes a discharging module 15, a first input terminal of the discharging module 15 is connected to the first input terminal of the first switch module 10, a second input terminal of the discharging module 15 is connected to the charging terminal of the time control module 12, and an output terminal of the discharging module 12 is connected to the output terminal of the time control module 12.
When the first switch module 10 is switched from the first conductive state to the second conductive state, the discharge module 15 works and performs discharge processing on the time control module 12; it should be noted that, in the embodiment of the present invention, the discharging module 15 controls the discharging time of the time control module 12, so as to ensure that the time of each braking of the switched reluctance motor 3 is consistent, so as to avoid the influence of insufficient discharging of the time control module 12 on the braking time.
Further, as a preferred embodiment of the present invention, as shown in fig. 3, the discharging module 15 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first switching element Q1.
The first end of the first resistor R1 is a first input end of the discharge module 15, the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the control end of the first switching element Q1, the second end of the second resistor R2 is commonly connected with the output end of the first switching element Q1 to form an output end of the discharge module 15, the input end of the first switching element Q1 is connected with the second end of the third resistor R3, and the first end of the third resistor R3 is a second input end of the discharge module 15.
It should be noted that, in the embodiment of the present invention, the first switching element Q1 is formed of a P-type triode, the base of the P-type triode is the control end of the first switching element Q1, the emitter of the P-type triode is the input end of the first switching element Q1, and the collector of the P-type triode is the output end of the first switching element Q1.
Further, as a preferred embodiment of the present invention, as shown in fig. 3, the time control module 12 includes a fourth resistor R4, a charging capacitor C1, a fifth resistor R5, and a second switching element Q2.
The first end of the fourth resistor R4 is a first input end of the time control module 12, the second end of the fourth resistor R4 is commonly connected with the first end of the charging capacitor C1, the first end of the fifth resistor R5 and the control end of the second switching element Q2 to form a charging end of the time control module 12, the second end of the charging capacitor C1 is commonly connected with the second end of the fifth resistor R5 and the output end of the second switching element Q2 to form an output end of the time control module 12, and the input end of the second switching element Q2 is a second input end of the time control module 12.
In the embodiment of the present invention, the second switching element Q2 is formed of an N-type field effect transistor, a gate of the N-type field effect transistor is a control end of the second switching element Q2, a drain of the N-type field effect transistor is an input end of the second switching element Q2, and a source of the N-type field effect transistor is an output end of the second switching element Q2.
Further, as a preferred embodiment of the present invention, as shown in fig. 3, the operating voltage generating module 13 includes a first diode D1, a second diode D2, and a switching power supply 130.
The anode of the first diode D1 is a first input end of the working voltage generating module 13, the anode of the second diode D2 is a second input end of the working voltage generating module 13, the cathode of the first diode D1 is connected with the first input end of the switching power supply 130, the cathode of the second diode D2 is connected with the second input end of the switching power supply 130, the first output end of the switching power supply 130 is an output end of the working voltage generating module 13, and the second output end of the switching power supply 130 is grounded.
It should be noted that, in the embodiment of the present invention, the switching power supply 130 may be implemented by using an existing switching circuit, which is not limited herein.
Further, as a preferred embodiment of the present invention, as shown in fig. 3, the first switch module 10 includes a third diode D3 and a single pole double throw relay J1.
The cathode of the third diode D3 is commonly connected with the first end 1 of the single-pole double-throw relay J1 to form a first input end of the first switch module 10, the second end 2 of the single-pole double-throw relay J1 is a second input end of the first switch module 10, the anode of the third diode D3 is commonly connected with the third end 3 of the single-pole double-throw relay to form a first output end of the first switch module 10, and the first contact a of the single-pole double-throw relay J1 is a second output end of the first switch module 10.
The single pole double throw relay J1 further includes a second contact B. As can be seen from fig. 1 and 3, when the first end 1 of the single pole double throw relay J1 is connected to the first contact a, the single pole double throw relay J1 is in a first conductive state, i.e. the first switch module 10 is in a first conductive state; when the first end 1 of the single-pole double-throw relay J1 is communicated with the second contact B, the single-pole double-throw relay J1 is in a two-conduction state, namely the first switch module 10 is in a second conduction state; furthermore, in the embodiment of the present invention, the third diode D3 is connected in anti-parallel with the winding of the single pole double throw relay J1, so that when the winding of the single pole double throw relay J1 is powered off, the third diode D3 can provide a freewheel loop for the winding of the single pole double throw relay J1.
Further, as a preferred embodiment of the present invention, as shown in fig. 3, the second switch module 11 includes a fourth diode D4, a sixth resistor R6, and a double pole double throw relay J2.
The first end of the sixth resistor R6 is the first input end of the second switch module 11, the second end of the sixth resistor R6 is commonly connected with the cathode of the fourth diode D4 and the first end 1 of the double-pole double-throw relay J2, the anode of the fourth diode D4 is commonly connected with the second end 2 of the double-pole double-throw relay J2 to form the first output end of the second switch module 11, the first contact B1, the second contact B2, the third contact A1 and the fourth contact A2 of the double-pole double-throw relay are respectively the second input end, the third input end, the fourth input end and the fifth input end of the second switch module 11, and the third end 3 and the fourth end 4 of the double-pole double-throw relay J2 are respectively the second output end and the third output end of the second switch module 11.
It should be noted that, as shown in fig. 1 and 3, when the third end 3 of the double-pole double-throw relay J2 is connected to the fourth contact A2 and the fourth end 4 is connected to the third contact A1, the double-pole double-throw relay J2 is in the first conductive state, i.e., the second switch module 11 is in the first conductive state; when the third end 3 of the double-pole double-throw relay J2 is communicated with the second contact B2 and the fourth end 4 is communicated with the first contact B1, the double-pole double-throw relay J2 is in a second conduction state, namely the second switch module 11 is in a second conduction state; furthermore, in the embodiment of the present invention, the fourth diode D4 is connected in anti-parallel with the winding of the double-pole double-throw relay J2, so that the fourth diode D4 can provide a freewheel loop for the winding of the double-pole double-throw relay J2 when the winding of the double-pole double-throw relay J2 is deenergized.
Further, as a preferred embodiment of the present invention, as shown in fig. 3, the switch circuit 2 includes a single pole double throw switch K1.
The first end 1 of the single-pole double-throw switch K1 is an input end of the switch circuit 2, the first contact a of the single-pole double-throw switch K1 is a first output end of the switch circuit 2, and the second contact B of the single-pole double-throw switch K1 is a second output end of the switch circuit 2.
It should be noted that, as shown in fig. 1 and fig. 3, when the first end 1 of the single pole double throw switch K1 is connected to the first contact a, the single pole double throw switch K1 is in the first conductive state, i.e. the switch circuit 2 is in the first conductive state; when the first end 1 of the single pole double throw switch K1 is connected to the second contact B, the single pole double throw switch K1 is in the second conductive state, i.e. the switch circuit 2 is in the second conductive state.
Further, as a preferred embodiment of the present invention, as shown in fig. 3, the braking direct current generating module 14 includes a transforming unit 140 and a rectifying unit 141.
The first input end and the second input end of the transforming unit 140 are respectively a first input end and a second input end of the braking direct current generating module 14, the first output end and the second output end of the transforming unit 140 are respectively connected with the first input end and the second input end of the rectifying unit 141, and the first output end and the second output end of the rectifying unit 141 are respectively a first output end and a second output end of the braking direct current generating module 14.
Specifically, the voltage transformation unit 140 receives the ac power, converts the ac power into a low-voltage ac power, and outputs the low-voltage ac power to the rectification unit 141, and the rectification unit 141 rectifies the low-voltage ac power and outputs the braking dc power.
Further, as a preferred embodiment of the present invention, as shown in fig. 3, the transforming unit 140 is composed of a transformer TX, which mainly converts the high voltage ac input from the external power source into the low voltage ac, and the rectifying unit 141 is composed of a full bridge rectifier bridge U1, which mainly converts the low voltage ac output from the transformer TX into the low voltage dc.
The following describes the operation principle of the brake circuit 1 according to the embodiment of the present invention by taking the circuit structure shown in fig. 3 as an example, and details thereof are as follows:
when the first end 1 of the single pole double throw switch K1 is connected to its first contact a, the drive circuit (the driver 4 and the switched reluctance motor 3) is powered on and the brake circuit 1 is powered off. Specifically, when the first end 1 of the single pole double throw switch K1 is connected to the first contact a thereof, the transformer TX has no input, the brake circuit 1 does not operate, at this time, the third end 3 of the double pole double throw relay J2 is connected to the fourth contact A2 thereof, the fourth end 4 is connected to the third contact A1 thereof, the driver 4 receives the alternating current outputted from the external power source, and energizes the first winding and the second winding of the switched reluctance motor 3, and energizes the third winding of the switched reluctance motor 3 through the double pole double throw relay J2, thereby realizing the driving of the switched reluctance motor 3.
When the first end 1 of the single pole double throw switch K1 is connected to the second contact B thereof, the driver 4 has no input, i.e. the driving circuit is powered off, and both the transformer TX and the switching power supply 130 receive the alternating current outputted from the external power supply, i.e. the brake circuit is powered on. The switching power supply generates 15V direct current according to the alternating current, and the winding of the double-pole double-throw relay J2 is electrified by utilizing the 15V direct current, so that the double-pole double-throw relay J2 is respectively switched to a contact B1 and a contact B2 from the contact A1 and the contact A2, and further the braking circuit 1 is connected with the third winding of the switched reluctance motor 3, and the switched reluctance motor 3 enters a braking state; it should be noted that the on state of the single-pole double-throw switch K1 can control the on state of the double-pole double-throw relay J2, so as to control the connection between the third winding and one of the driving circuit and the braking circuit 1, i.e. the single-pole double-throw switch K1 is used as a switch between the driving circuit and the braking circuit 1, which can ensure that only one circuit works at any time.
Specifically, after the brake circuit 1 is powered on, the transformer TX converts the received high-voltage ac input into low-voltage ac, and then rectifies the low-voltage ac through the rectifier bridge U1, so as to provide electric energy, that is, brake voltage, for braking the switched reluctance motor 3, where the magnitude of the brake voltage can change the corresponding transformer according to actual requirements. The 15V dc generated by the switching power supply 130 is a single pole double throw relay J1, a double pole double throw relay J2, and the time control module 12 provides an operating voltage, that is, the 15V dc output by the switching power supply 130 is used as the operating voltage of the double pole double throw relay J2 to supply power to the windings of the double pole double throw relay J2, so that the third end 3 of the double pole double throw relay J2 is connected to the second contact B2 thereof, the fourth end 4 is connected to the first contact B1 thereof, and the 15V dc output by the switching power supply 130 is used as the operating voltage of the single pole double throw relay J1 to the winding of the single pole double throw relay J1, so that the third end of the single pole double throw relay J1 is connected to the first contact a thereof, at this time, the braking current is connected through the single pole double throw relay J1, the double pole double throw relay J2 and the third winding of the switching reluctance motor 3, that is braked, that is, when a certain phase winding of the switching reluctance motor 3 is directly charged, the phase winding will generate electromagnetic force, and the rotor is finally braked by the electromagnetic force, that is fixed by the switching reluctance motor 3, that is realized.
Meanwhile, the 15V direct current voltage starts to charge the charging capacitor C1 through the fourth resistor R4, the voltage of the charging capacitor C1 is 0V initially, the charging current charges the charging capacitor C1 through the fourth resistor R4, the voltage of the end of the charging capacitor C1 gradually rises, the fifth resistor R5 is connected in parallel with the charging capacitor C1 and then connected in series with the fourth resistor R4, and the fifth resistor R5 serves as a voltage dividing resistor to limit the voltage of the gate end of the second switching element Q2. When the voltage across the charging capacitor C1 does not reach the threshold voltage of the second switching element Q2, the second switching element Q2 is turned off. The third end of the single-pole double-throw relay J1 is kept in a state of being connected with the first contact A, and the braking circuit 1 continuously brakes the switched reluctance motor 3; when the voltage at two ends of the charging capacitor C1 reaches the threshold voltage of the second switching element Q2, the second switching element Q2 is conducted, so that a winding of the single-pole double-throw relay J1 and the second switching element Q2 form an electrifying path, the single-pole double-throw relay J1 is switched from the contact A to the contact B, at the moment, a braking loop is broken, braking current is cut off, and braking action is completed. It should be noted that, in the embodiment of the present invention, the braking execution time may be set by changing the parameters of the fourth resistor R4 and the charging capacitor C1, and the braking speed is realized by selecting the transformer TX with appropriate parameters.
When the brake circuit 1 is powered off, a quick discharging circuit of the charge capacitor C1 is designed in order to ensure that the charge capacitor C1 is rapidly discharged so as not to influence the next brake time. Specifically, when the braking circuit 1 is powered off, the 15V dc voltage provided by the switching power supply 130 disappears, at this time, the first resistor R1 and the second resistor R2 divide voltage and then output a low level to the first switching element Q1, so that the first switching element Q1 is turned on, the charging capacitor C1 forms a discharging loop through the third resistor R3 and the first switching element Q1, and charges at two ends of the charging capacitor C1 are rapidly discharged, thereby ensuring that the braking time of each time is consistent; the discharge time is determined by the resistance value of the third resistor R3.
Further, the present invention also provides a switched reluctance motor, which includes a brake circuit 1, and since the brake circuit 1 in the switched reluctance motor provided in the embodiment of the present invention is the same as the brake circuit 1 shown in fig. 3, the specific working principle of the switched reluctance motor provided in the embodiment of the present invention may refer to the foregoing detailed description about fig. 3, and will not be repeated herein.
In the embodiment of the invention, by adopting the brake circuit 1 comprising the first switch module 10, the second switch module 11, the time control module 12, the working voltage generation module 13 and the brake direct current generation module 14, when the switch circuit 2 connected with the brake circuit 1 is in the first conduction state, the second switch module 11 enters the first conduction state, so that the third winding of the switch reluctance motor 3 is connected with the driver 4, and the driver 4 receives alternating current input by an external power supply and drives the switch reluctance motor 3 to operate according to the alternating current; when the switch circuit 2 is in the second conducting state, the first switch module 10 enters the first conducting state, the braking direct current generating module 14 receives the alternating current and outputs the braking direct current to the first switch module 10 according to the alternating current, and the first switch module 10 outputs the braking direct current to the second switch module 11; the working voltage generating module 13 receives the alternating current and outputs working voltage to the first switch module 10, the time control module 12 and the second switch module 11 according to the alternating current; when the time control module 12 works according to the working voltage and the delay time of the time control module 12 does not arrive, the first switch module 10 maintains a first conduction state, the second switch module 11 switches from the first conduction state to a second conduction state according to the working voltage and outputs braking direct current to the third winding of the switched reluctance motor 3, so that the switched reluctance motor 3 starts braking according to the braking direct current, when the delay time of the time control module 12 arrives, the first switch module 10 switches from the first conduction state to the second conduction state according to the working voltage and stops outputting the braking direct current to the second switch module 11, so that the switched reluctance motor 3 stops braking, the brake circuit 1 can set different braking time according to actual needs, the safety reliability is high, and the problem that the existing SRM is extremely vulnerable to damage to human body or equipment adopting the SRM due to the time spent on braking is solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A braking circuit of a switched reluctance motor, the braking circuit being connected to the switching circuit, the switched reluctance motor, and a driver connected to a first winding and a second winding of the switched reluctance motor, the braking circuit comprising:
the device comprises a first switch module, a second switch module, a time control module, a working voltage generation module and a braking direct current generation module;
the input end of the switching circuit is connected with a first interface of an external power supply, the first output end of the switching circuit is connected with the first input end of the driver, the second input end of the driver is connected with a second interface of the external power supply, and the second output end of the switching circuit is connected with the first input end of the working voltage generating module and the first input end of the braking direct current generating module; the second input end of the working voltage generating module is connected with the third interface of the external power supply and the second input end of the braking direct current generating module, and the output end of the working voltage generating module is connected with the first input end of the first switch module, the first input end of the time control module and the first input end of the second switch module; the first output end of the braking direct current generating module is connected with the second input end of the first switch module, and the second output end of the braking direct current generating module is connected with the second input end of the second switch module; the first output end of the first switch module is connected with the second input end of the time control module, and the second output end of the first switch module is connected with the third input end of the second switch module; the first output end of the second switch module is commonly grounded with the output end of the time control module, the fourth input end of the second switch module is connected with the first output end of the driver, the fifth input end of the second switch module is connected with the second output end of the driver, the second output end of the second switch module is connected with the first end of the third winding of the switch reluctance motor, and the third output end of the second switch module is connected with the second end of the third winding;
when the switch circuit is in a first conduction state, the second switch module enters the first conduction state so that a third winding of the switch reluctance motor is connected with the driver, and the driver receives alternating current input by the external power supply and drives the switch reluctance motor to operate according to the alternating current; when the switch circuit is in a second conduction state, the first switch module enters a first conduction state, the braking direct current generating module receives the alternating current and outputs the braking direct current to the first switch module according to the alternating current, and the first switch module outputs the braking direct current to the second switch module; the working voltage generating module receives the alternating current and outputs working voltage to the first switch module, the time control module and the second switch module according to the alternating current; the time control module works according to the working voltage, when the delay time of the time control module does not arrive, the first switch module maintains the first conduction state, the second switch module switches from the first conduction state to the second conduction state according to the working voltage and outputs the braking direct current to the third winding of the switched reluctance motor so that the switched reluctance motor starts to brake according to the braking direct current, and when the delay time of the time control module arrives, the first switch module switches from the first conduction state to the second conduction state according to the working voltage and stops outputting the braking direct current to the second switch module so that the switched reluctance motor stops braking.
2. The brake circuit of claim 1, further comprising a discharge module, a first input of the discharge module being connected to the first input of the first switch module, a second input of the discharge module being connected to the charge of the time control module, an output of the discharge module being connected to the output of the time control module;
when the first switch module is switched from the first conduction state to the second conduction state, the discharge module works and performs discharge processing on the time control module.
3. The braking circuit of claim 2, wherein the discharge module comprises a first resistor, a second resistor, a third resistor, and a first switching element;
the first end of the first resistor is a first input end of the discharge module, the second end of the first resistor is connected with the first end of the second resistor and the control end of the first switch element, the second end of the second resistor and the output end of the first switch element are connected together to form an output end of the discharge module, the input end of the first switch element is connected with the second end of the third resistor, and the first end of the third resistor is a second input end of the discharge module.
4. The braking circuit of claim 2, wherein the time control module comprises a fourth resistor, a charging capacitor, a fifth resistor, and a second switching element;
the first end of the fourth resistor is a first input end of the time control module, the second end of the fourth resistor is connected with the first end of the charging capacitor, the first end of the fifth resistor and the control end of the second switching element to form a charging end of the time control module, the second end of the charging capacitor is connected with the second end of the fifth resistor and the output end of the second switching element to form an output end of the time control module, and the input end of the second switching element is a second input end of the time control module.
5. The braking circuit of claim 2, wherein the operating voltage generating module comprises a first diode, a second diode, and a switching power supply;
the anode of the first diode is a first input end of the working voltage generation module, the anode of the second diode is a second input end of the working voltage generation module, the cathode of the first diode is connected with the first input end of the switching power supply, the cathode of the second diode is connected with the second input end of the switching power supply, the first output end of the switching power supply is an output end of the working voltage generation module, and the second output end of the switching power supply is grounded.
6. The braking circuit of claim 2, wherein the first switching module comprises a third diode and a single pole double throw relay;
the cathode of the third diode is commonly connected with the first end of the single-pole double-throw relay to form a first input end of the first switch module, the second end of the single-pole double-throw relay is a second input end of the first switch module, the anode of the third diode is commonly connected with the third end of the single-pole double-throw relay to form a first output end of the first switch module, and the first contact of the single-pole double-throw relay is a second output end of the first switch module.
7. The braking circuit of claim 2, wherein the second switching module comprises a fourth diode, a sixth resistor, and a double pole double throw relay;
the first end of the sixth resistor is the first input end of the second switch module, the second end of the sixth resistor is commonly connected with the cathode of the fourth diode and the first end of the double-pole double-throw relay, the anode of the fourth diode is commonly connected with the second end of the double-pole double-throw relay to form the first output end of the second switch module, the first contact, the second contact, the third contact and the fourth contact of the double-pole double-throw relay are respectively the second input end, the third input end, the fourth input end and the fifth input end of the second switch module, and the third end and the fourth end of the double-pole double-throw relay are respectively the second output end and the third output end of the second switch module.
8. The braking circuit of claim 2 wherein the switching circuit comprises a single pole double throw switch;
the first end of the single-pole double-throw switch is the input end of the switch circuit, the first contact of the single-pole double-throw switch is the first output end of the switch circuit, and the second contact of the single-pole double-throw switch is the second output end of the switch circuit.
9. The brake circuit according to any one of claims 1 to 8, wherein the brake dc power generation module includes a voltage transformation unit and a rectification unit;
the first input end and the second input end of the transformation unit are respectively a first input end and a second input end of the braking direct current generation module, the first output end and the second output end of the transformation unit are respectively connected with the first input end and the second input end of the rectification unit, and the first output end and the second output end of the rectification unit are respectively a first output end and a second output end of the braking direct current generation module;
the transformation unit receives the alternating current, converts the alternating current into low-voltage alternating current and outputs the low-voltage alternating current to the rectification unit, and the rectification unit rectifies the low-voltage alternating current and outputs the braking direct current.
10. A switched reluctance motor comprising a braking circuit according to any one of claims 1 to 9.
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|---|---|---|---|
| CN201611059731.9A CN106602944B (en) | 2016-11-25 | 2016-11-25 | Switch reluctance motor and braking circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611059731.9A CN106602944B (en) | 2016-11-25 | 2016-11-25 | Switch reluctance motor and braking circuit thereof |
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| CN106602944B true CN106602944B (en) | 2023-07-07 |
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| JP2014131411A (en) * | 2012-12-28 | 2014-07-10 | Panasonic Corp | Motor controller and motor control method |
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| JPH08265901A (en) * | 1995-03-22 | 1996-10-11 | Kokusan Denki Co Ltd | Drive controller for motor vehicle |
| CN102437803A (en) * | 2011-12-23 | 2012-05-02 | 东南大学 | Switched reluctance motor bootstrap drive circuit with low cost and high isolation characteristic |
| JP2014131411A (en) * | 2012-12-28 | 2014-07-10 | Panasonic Corp | Motor controller and motor control method |
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