CN211744376U - Braking device for AC motor - Google Patents
Braking device for AC motor Download PDFInfo
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- CN211744376U CN211744376U CN202020556331.4U CN202020556331U CN211744376U CN 211744376 U CN211744376 U CN 211744376U CN 202020556331 U CN202020556331 U CN 202020556331U CN 211744376 U CN211744376 U CN 211744376U
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- power supply
- contactor
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Abstract
A braking device of an alternating current motor comprises a starting contactor, a braking contactor, a time delay relay and a direct current power supply circuit, wherein the starting contactor controls the on-off of an alternating current power supply of a motor winding, the braking contactor controls the on-off of a direct current power supply of the motor winding, when the alternating current power supply of the motor winding is switched off, the direct current power supply is switched on with the motor winding, the motor winding generates a direct current magnetic field, so that a rotor rotating inertially induces braking torque, and the motor is rapidly stopped. And the delay relay disconnects the direct-current power supply from the motor winding after the motor stops running. The brake has the advantages of rapid braking, small braking current and convenient installation and use.
Description
Technical Field
The present invention relates to a braking device for an ac motor.
Background
After the power supply of the alternating current motor is cut off, the alternating current motor still rotates due to the action of inertia, and a braking device of the alternating current motor is needed to be provided for rapidly stopping the alternating current motor.
Disclosure of Invention
The invention aims to provide a braking device of an alternating current motor, which has the advantages of rapid braking, no mechanical abrasion of the braking device and long service life.
The technical scheme of the invention is that the braking device of the alternating current motor comprises a starting contactor, a braking contactor, a time delay relay and a direct current power supply circuit, wherein a main contact 1JC1 of the starting contactor is connected between a three-phase power supply and a motor winding in series, and the braking device is characterized in that the input end of the direct current power supply circuit is connected with a two-phase power supply through a main contact 2JC 1' of the braking contactor, and the output end of the direct current power supply circuit is connected with any two phases of the motor winding through another main contact 2JC1 of the braking contactor;
one end of a coil 1JC of the starting contactor is connected with a phase C of a power supply, the other end of the coil 1JC of the starting contactor is connected with a phase B of the power supply through a normally closed contact 2JC3, a starting button QA and a normally closed contact of a stopping button TA which are sequentially connected in series, wherein the normally closed contact 1JC2 of the starting contactor is connected in parallel with the QA of the starting button;
one end of a coil 2JC of the brake contactor is connected with a phase C of a power supply, the other end of the coil 2JC of the brake contactor is connected with a phase B of the power supply through a normally closed contact 1JC3, a normally closed contact SJ1 and a normally open contact of a stop button TA which are sequentially connected in series, and the normally open contact of the stop button TA is connected with a normally open contact 2JC2 of the brake contactor in parallel;
one end of a coil SJ of the delay relay is connected with the phase C of the power supply, and the other end of the coil SJ of the delay relay is connected with the phase B of the power supply through a normally open contact 2JC2 of the brake contactor.
The working principle of the motor braking system is that the starting contactor controls the connection and disconnection between the motor winding and the alternating current power supply, the braking contactor controls the connection and disconnection between the motor winding and the direct current power supply, when the motor is stopped, the motor winding is disconnected with the alternating current power supply, the motor winding is connected with the direct current power supply, the motor winding generates a direct current magnetic field to brake a motor rotor, and when braking is finished, the delay relay controls the braking contactor to disconnect the motor winding from the direct current power supply.
The braking device has the advantages that the direct-current magnetic field generated by the motor winding is used for braking, the braking torque is large, the braking is rapid, no mechanical part is arranged in the braking device, and the service life is long.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is another schematic diagram of the dc power supply circuit.
Detailed Description
A braking device of an alternating current motor comprises a starting contactor, a braking contactor, a time delay relay and a direct current power supply circuit, wherein a main contact 1JC1 of the starting contactor is connected in series between a three-phase power supply (A phase, B phase and C phase) and a motor winding, the input end of the direct current power supply circuit is connected with the two-phase power supply (B phase and C phase), a main contact 2JC 1' of the braking contactor is connected in an input loop of the direct current power supply circuit in series, the output end of the direct current power supply circuit is connected with any two phases of the motor winding, and the other main contact 2JC1 of the braking contactor is connected in an output loop of the direct current power supply circuit in series;
one end of a coil 1JC of the starting contactor is connected with a phase C of a power supply, the other end of the coil 1JC of the starting contactor is connected with a phase B of the power supply through a normally closed contact 2JC3, a starting button QA and a normally closed contact of a stopping button TA which are sequentially connected in series, wherein the normally closed contact 1JC2 of the starting contactor is connected in parallel with the QA of the starting button;
one end of a coil 2JC of the brake contactor is connected with a phase C of a power supply, the other end of the coil 2JC of the brake contactor is connected with a phase B of the power supply through a normally closed contact 1JC3, a normally closed contact SJ1 and a normally open contact of a stop button TA which are sequentially connected in series, and the normally open contact of the stop button TA is connected with a normally open contact 2JC2 of the brake contactor in parallel;
one end of a coil SJ of the delay relay is connected with the phase C of the power supply, and the other end of the coil SJ of the delay relay is connected with the phase B of the power supply through a normally open contact 2JC2 of the brake contactor.
Pressing a start button QA, electrifying a coil 1JC of the start contactor, closing a main contact 1JC1 of the start contactor, and rotating a motor; the method comprises the steps that a stop button TA is pressed, a coil 1JC of a starting contactor loses power, a main contact 1JC1 of the starting contactor is disconnected, a coil 2JC of a braking contactor gets power, main contacts 2JC 1' and 2JC1 of the braking contactor are closed, a motor winding is connected with a direct current power supply, the motor winding generates a direct current magnetic field to brake a rotor, the coil SJ of a delay relay gets power while the coil 2JC of the braking contactor gets power, a normally closed contact SJ1 of the delay relay is disconnected in a delayed mode, the braking contactor loses power, the motor winding is disconnected from the direct current power supply, the delay time is longer than the time required by braking, and the delay time can be set to be about 1 second.
The direct-current power supply circuit comprises a transformer BK1 and a bridge rectifier QL1, wherein the secondary pole of the transformer BK1 is connected with the input end of the bridge rectifier QL1, the primary pole of the transformer BK1 is the input end of the direct-current power supply circuit, and the output end of the bridge rectifier QL1 is the output end of the direct-current power supply circuit.
In order to adapt the direct current power supply circuit to motors with different powers and reduce the volume and weight of the direct current power supply circuit, the direct current power supply circuit can be a silicon controlled voltage regulation structure which comprises a unidirectional Silicon Controlled Rectifier (SCR) and a trigger circuit thereof, the trigger circuit comprises a transformer BK2, one end of a secondary coil of the transformer BK2 is connected with the anode of a diode D2, the other end of the secondary coil of the transformer BK2 is connected with the anode of a diode D3, a center tap of the secondary coil of the transformer BK2 is grounded, a cathode of a diode D2 is connected with the cathode of a diode D3, the cathode of a diode D2 is grounded through a capacitor C1, the cathode of a diode D2 is connected with the second base of a single-junction transistor BT1 through a resistor R1, a first base of a unijunction transistor BT1 is grounded through a resistor R2, the emitter of a unijunction transistor BT1 is grounded through a capacitor C2, one end of the, the cathode of the diode D4 is connected with the cathode of a voltage regulator tube DW through a resistor R3, the anode of the voltage regulator tube DW is grounded, the cathode of the voltage regulator tube DW is connected with the emitter of a single-junction transistor BT1 through a variable resistor R4, the first base of a single-junction transistor BT1 is connected with the control electrode of a one-way silicon controlled rectifier SCR, the anode of the one-way silicon controlled rectifier SCR is connected with one end of a primary coil of a transformer BK2, the cathode of the one-way silicon controlled rectifier SCR is grounded, the other end of the primary coil of the transformer BK2 is connected with the anode of the diode D1.
The diode D2, the diode D3 and the capacitor C1 form a rectifying and filtering circuit to provide a working power supply for the unijunction transistor BT1, the resistor R1, the unijunction transistor BT1, the resistor R2, the capacitor C2, the diode D4, the resistor R3, the voltage stabilizing tube DW and the variable resistor R4 form a trigger circuit, trigger pulses output by the unijunction transistor enable the unidirectional SCR to be conducted, the resistance value of the variable resistor R4 is adjusted, the conduction angle of the unidirectional SCR can be changed, and the direct-current power supply circuit outputs proper voltage.
To facilitate the installation of wiring, one end of the primary coil of the transformer BK2 is led out by the first terminal J1, the other end of the primary coil of the transformer BK2 is led out by the second terminal J2, the anode of the diode D1 is led out by the third terminal J3, the cathode of the diode D1 is led out by the fourth terminal J4, the first terminal J1 and the second terminal J2 are input terminals of a dc power supply circuit, and the third terminal J3 and the fourth terminal J4 are output terminals of the dc power supply circuit.
Claims (3)
1. A braking device of an alternating current motor comprises a starting contactor, a braking contactor, a time delay relay and a direct current power supply circuit, wherein a main contact 1JC1 of the starting contactor is connected between a three-phase power supply and a motor winding in series, and the braking device is characterized in that the input end of the direct current power supply circuit is connected with a two-phase power supply through one main contact 2JC 1' of the braking contactor, and the output end of the direct current power supply circuit is connected with any two phases of the motor winding through the other main contact 2JC1 of the braking contactor;
one end of a coil 1JC of the starting contactor is connected with a phase C of a power supply, the other end of the coil 1JC of the starting contactor is connected with a phase B of the power supply through a normally closed contact 2JC3, a starting button QA and a normally closed contact of a stopping button TA which are sequentially connected in series, wherein the normally closed contact 1JC2 of the starting contactor is connected in parallel with the QA of the starting button;
one end of a coil 2JC of the brake contactor is connected with a phase C of a power supply, the other end of the coil 2JC of the brake contactor is connected with a phase B of the power supply through a normally closed contact 1JC3, a normally closed contact SJ1 and a normally open contact of a stop button TA which are sequentially connected in series, and the normally open contact of the stop button TA is connected with a normally open contact 2JC2 of the brake contactor in parallel;
one end of a coil SJ of the delay relay is connected with the phase C of the power supply, and the other end of the coil SJ of the delay relay is connected with the phase B of the power supply through a normally open contact 2JC2 of the brake contactor.
2. The ac motor braking apparatus according to claim 1, wherein the dc power circuit comprises a transformer BK1 and a bridge rectifier QL1, the secondary pole of the transformer BK1 is connected to the input terminal of the bridge rectifier QL1, the primary of the transformer BK1 is the input terminal of the dc power circuit, and the output terminal of the bridge rectifier QL1 is the output terminal of the dc power circuit.
3. The alternating current motor braking device according to claim 1, wherein the direct current power circuit includes a one-way thyristor SCR and a trigger circuit thereof, the trigger circuit includes a transformer BK2, one end of the secondary winding of the transformer BK2 is connected to the anode of the diode D2, the other end of the secondary winding of the transformer BK2 is connected to the anode of the diode D3, the center tap of the secondary winding of the transformer BK2 is grounded, the cathode of the diode D2 is connected to the cathode of the diode D3, the cathode of the diode D2 is grounded through the capacitor C1, the cathode of the diode D2 is connected to the second base of the monotube diode 1 through the resistor R1, the first base of the unijunction transistor BT 23 is grounded through the resistor R2, the emitter of the unijunction transistor BT1 is grounded through the capacitor C2, one end of the secondary winding of the transformer BK is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the cathode of the voltage regulator tube through the, the anode of the voltage-stabilizing tube DW is grounded, the cathode of the voltage-stabilizing tube DW is connected with the emitter of the single-junction transistor BT1 through a variable resistor R4, the first base electrode of the single-junction transistor BT1 is connected with the control electrode of the unidirectional silicon controlled rectifier SCR, the anode of the unidirectional silicon controlled rectifier SCR is connected with one end of the primary coil of the transformer BK2, the cathode of the unidirectional silicon controlled rectifier SCR is grounded, the other end of the primary coil of the transformer BK2 is connected with the anode of the diode D1, and the cathode of the diode D1 is grounded;
one end of the primary coil of the transformer BK2 is connected to the first terminal J1, the other end of the primary coil of the transformer BK2 is connected to the second terminal J2, the anode of the diode D1 is connected to the third terminal J3, the cathode of the diode D1 is connected to the fourth terminal J4, the first terminal J1 and the second terminal J2 are input terminals of the dc power supply circuit, and the third terminal J3 and the fourth terminal J4 are output terminals of the dc power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020556331.4U CN211744376U (en) | 2020-04-15 | 2020-04-15 | Braking device for AC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020556331.4U CN211744376U (en) | 2020-04-15 | 2020-04-15 | Braking device for AC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211744376U true CN211744376U (en) | 2020-10-23 |
Family
ID=72850830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020556331.4U Expired - Fee Related CN211744376U (en) | 2020-04-15 | 2020-04-15 | Braking device for AC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211744376U (en) |
-
2020
- 2020-04-15 CN CN202020556331.4U patent/CN211744376U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201023 Termination date: 20210415 |