CN209805706U - Dynamic braking circuit for servo motor - Google Patents
Dynamic braking circuit for servo motor Download PDFInfo
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- CN209805706U CN209805706U CN201920707989.8U CN201920707989U CN209805706U CN 209805706 U CN209805706 U CN 209805706U CN 201920707989 U CN201920707989 U CN 201920707989U CN 209805706 U CN209805706 U CN 209805706U
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Abstract
the utility model discloses a dynamic braking circuit for servo motor, servo motor's three-phase terminal is connected to the dc-to-ac converter three-phase output of this circuit, and pre-charge resistance concatenates in the negative bus of dc-to-ac converter, and the three-phase output of dc-to-ac converter, negative pole are connected respectively to the positive pole of first to third diode connect the generating line negative terminal through the normally closed contact of relay, relay normally open contact and pre-charge resistance parallel connection, and the relay coil concatenates in the control circuit of dc-to-ac converter. The circuit overcomes the defect of dynamic braking of the traditional servo motor, realizes energy consumption in a braking state by replacing a brake resistor with a pre-charging resistor of a servo control system, realizes power-on pre-charging of a servo driver and the dynamic braking function of the motor by utilizing normally open and normally closed contacts of the same relay respectively, is simple to control and reliable to operate, and effectively reduces equipment cost and volume.
Description
Technical Field
The utility model relates to a motor braking technical field especially relates to a dynamic braking circuit for servo motor.
Background
The dynamic braking of a servo motor is generally composed of dynamic braking resistors, and under various braking-required working conditions such as equipment failure, sudden stop, power failure and the like, the motor braking is realized through energy consumption of the braking resistors, so that the mechanical feeding of the servo motor is shortened.
As shown in fig. 1, dynamic braking is generally implemented by respectively connecting a brake resistor 1 in series on the outgoing line of the phase of the servo motor U, V, W, and the three brake resistors 1 are connected with each other through a normally closed contact 2 of a relay; when the servo motor normally works, the closed contact 2 is in a disconnected state, and three phase lines of the servo motor are not related to each other; when the servo motor needs to be braked, the normally closed contact 2 is closed, three phase lines of the servo motor are in short circuit through the brake resistor 1, and the brake resistor 1 consumes energy to realize the braking of the servo motor.
Because the brake resistor is used for consuming energy, the volume is relatively large, and a plurality of brake resistors are usually needed in the existing dynamic brake circuit, which seriously restricts the miniaturization development of the servo motor.
Disclosure of Invention
the utility model provides a dynamic braking circuit for servo motor, traditional servo motor dynamic braking's defect is overcome to this circuit, utilizes servo control system's pre-charge resistance to replace the energy consumption that brake resistance realized the brake state to utilize the normally open and normally closed contact of same relay, realize the dynamic braking function of last electricity pre-charge and motor of servo driver respectively, its control is simple, the operation is reliable, effectively reduces equipment cost and volume.
The utility model discloses a dynamic braking circuit for servo motor includes dc-to-ac converter, pre-charge electric capacity and pre-charge resistance, the input of dc-to-ac converter is connected the generating line, and servo motor's three-phase terminal is connected respectively to its three-phase output, pre-charge resistance concatenates between the input negative pole of dc-to-ac converter and generating line negative pole, the both ends of pre-charge electric capacity respectively with the positive pole of inverter input and input negative pole are connected;
The dynamic braking circuit further comprises a first diode, a second diode, a third diode and a relay with a normally open contact and a normally closed contact, anodes of the first diode, the second diode and the third diode are respectively connected with a three-phase output end of the inverter, cathodes of the first diode, the second diode and the third diode are connected with a negative pole of a bus through the normally closed contact, the normally open contact is connected with the pre-charging resistor in parallel, and a coil of the relay is connected in series in a control loop of the inverter.
Further, the pre-charge resistor is a power resistor.
Furthermore, the pre-charging group is connected in series between the positive electrode of the input end of the inverter and the positive electrode of the bus, the positive electrodes of the first diode, the second diode and the third diode are connected with the positive electrode of the bus through the normally closed contact, the cathodes of the first diode, the second diode and the third diode are respectively connected with the three-phase output end of the inverter, and the normally open contact of the relay is connected in series between the positive electrode of the input end of the inverter and the positive electrode of the bus after being connected with the pre-charging resistor in parallel.
Further, the inverter comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor, wherein the second pole of the first transistor, the second pole of the third transistor and the second pole of the fifth transistor are all connected with the positive pole of the bus, and the first pole of the second transistor, the first pole of the fourth transistor and the first pole of the sixth transistor are all connected with the negative pole of the bus; the first pole of the first transistor is a U-phase output terminal of the inverter and is connected to the second pole of the second transistor and the servo motor, the first pole of the third transistor is a V-phase output terminal of the inverter and is connected to the second pole of the fourth transistor and the servo motor, and the first pole of the fifth transistor is a W-phase output terminal of the inverter and is connected to the second pole of the sixth transistor and the servo motor.
Further, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, and the sixth transistor are IGBT modules or MOS transistors.
Because the utility model discloses a dynamic braking circuit for servo motor has adopted above-mentioned technical scheme, servo motor's three-phase terminal is connected to the dc-to-ac converter three-phase output of this circuit promptly, and pre-charge resistance concatenates in the negative bus of dc-to-ac converter, and the three-phase output of dc-to-ac converter, negative pole are connected respectively to the positive pole of first to third diode connect the generating line negative terminal through the normally closed contact of relay, relay normally open contact and pre-charge resistance parallel connection, and the relay coil concatenates in the control circuit of dc-to-ac converter. The circuit overcomes the defect of dynamic braking of the traditional servo motor, realizes energy consumption in a braking state by replacing a brake resistor with a pre-charging resistor of a servo control system, realizes power-on pre-charging of a servo driver and the dynamic braking function of the motor by utilizing normally open and normally closed contacts of the same relay respectively, is simple to control and reliable to operate, and effectively reduces equipment cost and volume.
Drawings
FIG. 1 is a diagram of a conventional servo motor dynamic braking circuit;
Fig. 2 is a circuit diagram of an embodiment of a dynamic braking circuit for a servo motor according to the present invention;
fig. 3 is a circuit diagram of another embodiment of the dynamic braking circuit for the servo motor according to the present invention.
Detailed Description
Embodiment as shown in fig. 2, in this embodiment, the dynamic braking circuit for the servo motor includes an inverter 3, a pre-charging capacitor C1 and a pre-charging resistor R1, an input end of the inverter 3 is connected to a bus, three phase output ends of the inverter 3 are respectively connected to three phase terminals of the servo motor M, the pre-charging resistor R1 is connected in series between a negative electrode of the input end of the inverter 3 and a negative electrode of the bus, and two ends of the pre-charging capacitor C1 are respectively connected to a positive electrode of the input end of the inverter and a negative electrode of the input end and are connected in parallel with the inverter 3;
the dynamic braking circuit further comprises a first diode D1, a second diode D2, a third diode D3 and a relay K with a normally open contact K1 and a normally closed contact K2, anodes of the first diode D1, the second diode D2 and the third diode D3 are respectively connected with a three-phase output end of the inverter 3, cathodes of the first diode D1, the second diode D2 and the third diode D3 are connected with a negative electrode of a bus through the normally closed contact K2, the normally open contact K1 is connected with the pre-charging resistor R1 in parallel, and a coil of the relay K is connected in series in a control loop of the inverter 3.
The inverter 3 is used for inverting the direct current from the direct current bus into alternating current. Specifically, the inverter 3 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6, wherein the second pole of the first transistor Q1, the second pole of the third transistor Q3, and the second pole of the fifth transistor Q5 are all connected to the positive pole of the bus bar, and the first pole of the second transistor Q2, the first pole of the fourth transistor Q4, and the first pole of the sixth transistor Q6 are all connected to the negative pole of the bus bar. The first terminal of the first transistor Q1 is a U-phase output terminal of the inverter 3 and is connected to the second terminal of the second transistor Q2 and the servo motor M, the first terminal of the third transistor Q3 is a V-phase output terminal of the inverter 3 and is connected to the second terminal of the fourth transistor Q4 and the servo motor M, and the first terminal of the fifth transistor Q5 is a W-phase output terminal of the inverter 3 and is connected to the second terminal of the sixth transistor Q6 and the servo motor M. The inverter 3 controls the on/off of the first transistor Q1 to the sixth transistor Q6 to realize an inverting function.
In the present embodiment, the first transistor Q1, the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5 and the sixth transistor Q6 are IGBT modules (insulated gate bipolar transistors), but of course, MOS transistors may be used. When the transistors Q1-Q6 are IGBT modules, the control electrode is a base electrode, the first electrode is an emitter electrode, and the second electrode is a collector electrode. When the transistors Q1-Q6 are MOS transistors, the control electrode is a gate, the first electrode is a source, and the second electrode is a drain.
The anode of the first diode D1 is connected with the U-phase output end of the inverter 3, the anode of the second diode D2 is connected with the V-phase output end of the inverter 3, the anode of the third diode D3 is connected with the W-phase output end of the inverter 3, and the cathode of the first diode D1, the cathode of the second diode D2 and the cathode of the third diode D3 are connected with the cathode of the bus through the serially connected relay normally-closed contact K2.
Preferably, the pre-charge resistor R1 is a power resistor.
The working process of the circuit is as follows:
Firstly, when the system is powered on, the relay K does not act, the normally closed contact K2 is in a closed state, the normally open contact K1 is in an open state, and the bus of the inverter 3 provides a pre-charging loop for the system through a pre-charging resistor R1 and a pre-charging capacitor C1; after the pre-charging is finished, the coil of the relay K is attracted, the normally closed contact K2 is disconnected, the normally open contact K1 is closed, the pre-charging loop and the braking loop are disconnected, the inverter 3 works normally and drives the servo motor M to operate, and no current exists on the pre-charging resistor R1 in the operation process; when a system is in fault, scram or power failure, the coil of the relay K is powered off, the normally closed contact K2 is turned into a closed state, the normally open contact K1 is turned into an open state, the U, V, W phase of the servo motor M is communicated with the first diode D1, the second diode D2 and the third diode D3, and the reverse diodes of the three transistors Q2, Q4 and Q6 in the lower bridge of the inverter 3 and the pre-charging resistor R1 form a loop, the pre-charging resistor R1 consumes energy, and the servo motor M is in a braking state, so that the servo motor M can be rapidly stopped, and dynamic braking is realized.
As shown in fig. 3, in another embodiment, a pre-charge resistor R1 is connected in series between the positive electrode of the input terminal of the inverter 3 and the positive electrode of the bus, the anodes of a first diode D1, a second diode D2 and a third diode D3 of the braking circuit for the servo motor are connected to the positive electrode of the bus through a normally closed contact K2, and the cathodes of the first diode D1, the second diode D2 and the third diode D3 are respectively connected to the three-phase output terminal of the inverter 3, that is, the cathode of the first diode D1 is connected to the U-phase output terminal of the inverter 3, the cathode of the second diode D2 is connected to the V-phase output terminal of the inverter 3, and the cathode of the third diode D3 is connected to the W-phase output terminal of. The normally open contact K1 of the relay K is connected between the positive electrode of the input end of the inverter 3 and the positive electrode of the bus in parallel with the pre-charging resistor R1. The working principle and the working state of the brake are similar to those of the brake in the process, a loop is formed by the U, V, W phase of the servo motor M, the first diode D1, the second diode D2 and the third diode D3, and the reverse diodes of the three transistors Q1, Q3 and Q5 in the upper bridge of the inverter 3 and the pre-charging resistor R1, and the energy-consuming dynamic brake of the pre-charging resistor is realized.
The dynamic braking energy dissipation resistor is directly replaced by the original pre-charging resistor in the system, so that the circuit is simpler, and the cost and the volume are reduced. Meanwhile, the system pre-charging and dynamic braking functions adopt a pair of mutually exclusive contacts, so that the dynamic braking is inevitably in a non-working state when the system normally operates, the reliability of the system is ensured, and the condition that the traditional dynamic braking possibly malfunctions when the system normally operates is avoided.
Claims (5)
1. A dynamic braking circuit for a servo motor, characterized by: the system comprises an inverter, a pre-charging capacitor and a pre-charging resistor, wherein the input end of the inverter is connected with a bus, the three-phase output end of the inverter is respectively connected with a three-phase terminal of a servo motor, the pre-charging resistor is connected in series between the negative electrode of the input end of the inverter and the negative electrode of the bus, and the two ends of the pre-charging capacitor are respectively connected with the positive electrode and the negative electrode of the input end of the inverter;
The dynamic braking circuit further comprises a first diode, a second diode, a third diode and a relay with a normally open contact and a normally closed contact, anodes of the first diode, the second diode and the third diode are respectively connected with a three-phase output end of the inverter, cathodes of the first diode, the second diode and the third diode are connected with a negative pole of a bus through the normally closed contact, the normally open contact is connected with the pre-charging resistor in parallel, and a coil of the relay is connected in series in a control loop of the inverter.
2. The dynamic braking circuit for a servo motor of claim 1, wherein: the pre-charge resistor is a power resistor.
3. The dynamic braking circuit for a servo motor of claim 1, wherein: the pre-charging group is connected between the positive electrode of the input end of the inverter and the positive electrode of the bus in series, the positive electrodes of the first diode, the second diode and the third diode are connected with the positive electrode of the bus through the normally closed contact, the cathodes of the first diode, the second diode and the third diode are respectively connected with the three-phase output end of the inverter, and the normally open contact of the relay is connected between the positive electrode of the input end of the inverter and the positive electrode of the bus in series after being connected with the pre-charging resistor in parallel.
4. the dynamic braking circuit for a servo motor according to claim 1 or 2, wherein: the inverter comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor, wherein the second pole of the first transistor, the second pole of the third transistor and the second pole of the fifth transistor are all connected with the anode of the bus, and the first pole of the second transistor, the first pole of the fourth transistor and the first pole of the sixth transistor are all connected with the cathode of the bus; the first pole of the first transistor is a U-phase output terminal of the inverter and is connected to the second pole of the second transistor and the servo motor, the first pole of the third transistor is a V-phase output terminal of the inverter and is connected to the second pole of the fourth transistor and the servo motor, and the first pole of the fifth transistor is a W-phase output terminal of the inverter and is connected to the second pole of the sixth transistor and the servo motor.
5. The dynamic braking circuit for a servo motor of claim 4, wherein: the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor and the sixth transistor are IGBT modules or MOS tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920707989.8U CN209805706U (en) | 2019-05-17 | 2019-05-17 | Dynamic braking circuit for servo motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920707989.8U CN209805706U (en) | 2019-05-17 | 2019-05-17 | Dynamic braking circuit for servo motor |
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| CN209805706U true CN209805706U (en) | 2019-12-17 |
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| CN201920707989.8U Active CN209805706U (en) | 2019-05-17 | 2019-05-17 | Dynamic braking circuit for servo motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912467A (en) * | 2019-12-13 | 2020-03-24 | 浙江禾川科技股份有限公司 | Motor driving circuit |
| CN112285537A (en) * | 2020-10-28 | 2021-01-29 | 南京科远驱动技术有限公司 | Circuit and method for self-diagnosis of main circuit of frequency converter |
| CN114785165A (en) * | 2022-06-20 | 2022-07-22 | 广东首航智慧新能源科技有限公司 | Alternating current/direct current converter, power supply module and fault detection method thereof |
-
2019
- 2019-05-17 CN CN201920707989.8U patent/CN209805706U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912467A (en) * | 2019-12-13 | 2020-03-24 | 浙江禾川科技股份有限公司 | Motor driving circuit |
| CN112285537A (en) * | 2020-10-28 | 2021-01-29 | 南京科远驱动技术有限公司 | Circuit and method for self-diagnosis of main circuit of frequency converter |
| CN114785165A (en) * | 2022-06-20 | 2022-07-22 | 广东首航智慧新能源科技有限公司 | Alternating current/direct current converter, power supply module and fault detection method thereof |
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