Motor residual energy release circuit

Abstract

The utility model provides a motor residual energy release circuit, which is applicable to a motor drive circuit; the motor drive circuit includes a power module, a control module, a first relay module and a second relay module; the first relay module and the second relay module both include a control end, a normally open static end, a dynamic end and a normally closed static end; the motor residual energy release circuit includes an NMOS tube Q1, an NMOS tube Q2, a capacitor C1 and a resistor; the capacitor C1 and the resistor are connected in series to form a discharge branch; the gate of the NMOS tube Q1 is connected to the control module, and the drain is connected to the normally closed static end of the first relay module and one end of the discharge branch; the source of the NMOS tube Q1 is connected to the negative pole of the power module; the gate of the NMOS tube Q2 is connected to the control module, and the drain is connected to the normally closed static end of the second relay module and the other end of the discharge branch; the source of the NMOS tube Q2 is connected to the negative pole of the power module. The utility model can actively discharge the residual energy in the motor, so that the motor can stop running quickly.

Description

Technical Field

[0001] The utility model relates to a motor control circuit, in particular to a motor residual energy release circuit. Background Art

[0002] The main circuit breaker in the high-voltage switch cabinet is movable and is placed on a movable chassis, also known as a handcart. The main circuit breaker is moved by manually rocking the chassis in or out. A grounding knife device is also provided in the high-voltage switch cabinet. When the chassis retreats to the test position, i.e., when the main circuit breaker is opened, the grounding knife in the grounding knife device needs to be operated to close the grounding knife so that the grounding knife contacts the outgoing line row, so that the outgoing line row is grounded, which can prevent live operation. Before the chassis needs to move forward to the working position, i.e., the main circuit breaker closing position, the grounding knife device needs to be operated first to separate the grounding knife from the outgoing line row, and then the chassis needs to move forward to the working position.

[0003] With the popularization of automation equipment and for the convenience of operation, the chassis vehicle and the grounding knife can be driven by motors.

[0004] When the controller controls the motor to stop running, there is still residual electrical energy in the motor, which makes the motor unable to stop immediately, which may cause problems such as collision of the mechanical structure. Summary of the invention

[0005] In view of the deficiencies in the prior art, the embodiment of the utility model provides a motor residual energy release circuit, which can actively discharge the residual energy in the motor when the motor is controlled to stop running, so that the motor can stop running quickly. To achieve the above technical objectives, the technical solution adopted by the embodiment of the utility model is:

[0006] The embodiment of the utility model provides a motor residual energy release circuit, which is applicable to a motor drive circuit;

[0007] The motor drive circuit includes a power module, a control module, a first relay module and a second relay module; the first relay module and the second relay module each include a control terminal, a normally open static terminal, a dynamic terminal and a normally closed static terminal;

[0008] The control module is connected to the control ends of the first relay module and the second relay module respectively; the positive pole of the power module is connected to the first relay module, the second relay module and the normally open static end; the positive pole of the motor M1 is connected to the static end of the first relay module, and the negative pole of the motor M1 is connected to the static end of the second relay module;

[0009] The motor residual energy release circuit includes an NMOS tube Q1, an NMOS tube Q2, a capacitor C1 and a resistor; the capacitor C1 and the resistor are connected in series to form a discharge branch;

[0010] The gate of the NMOS tube Q1 is connected to the control module, and the drain is connected to the normally closed static end of the first relay module and one end of the discharge branch; the source of the NMOS tube Q1 is connected to the negative electrode of the power module;

[0011] The gate of the NMOS tube Q2 is connected to the control module, the drain is connected to the normally closed static end of the second relay module and the other end of the discharge branch; the source of the NMOS tube Q2 is connected to the negative electrode of the power module.

[0012] Furthermore, the capacitor C1 is a safety capacitor.

[0013] Furthermore, the value of the capacitor C1 is 0.47 μF to 1 μF.

[0014] Furthermore, the value of the resistor is in the range of tens of ohms to hundreds of ohms.

[0015] Furthermore, the resistor is composed of resistors R1 and R2 connected in parallel.

[0016] The beneficial effects of the technical solution provided by the embodiment of the utility model are: the utility model can realize active discharge of residual electric energy in the motor with fewer devices, so that the motor can stop running quickly; the cost is low and the reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a motor residual energy release circuit in an embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] like Figure 1 As shown, a motor residual energy release circuit proposed in an embodiment of the utility model is applicable to a motor drive circuit;

[0020] The motor drive circuit includes a power supply module, a control module, a first relay module and a second relay module; the first relay module and the second relay module each include a control terminal, a normally open static terminal, a dynamic terminal and a normally closed static terminal; Figure 1 In the embodiment, the first, second and third terminals of the first relay module and the second relay module are respectively the normally open static terminal, the moving terminal and the normally closed static terminal, and the fourth terminal is the control terminal; for the first relay module and the second relay module, in the normal state (i.e. when the control terminal is at a low level), the moving terminal is connected to the normally closed static terminal, and when the control terminal is at a high level, the moving terminal is connected to the normally open static terminal;

[0021] The control module is connected to the control ends of the first relay module and the second relay module respectively; the positive pole of the power module is connected to the first relay module, the second relay module and the normally open static end; the positive pole of the motor M1 is connected to the static end of the first relay module, and the negative pole of the motor M1 is connected to the static end of the second relay module;

[0022] The motor residual energy release circuit includes an NMOS tube Q1, an NMOS tube Q2, a capacitor C1 and a resistor; the capacitor C1 and the resistor are connected in series to form a discharge branch;

[0023] The gate of the NMOS tube Q1 is connected to the control module, and the drain is connected to the normally closed static end of the first relay module and one end of the discharge branch; the source of the NMOS tube Q1 is connected to the negative electrode of the power module;

[0024] The gate of the NMOS tube Q2 is connected to the control module, and the drain is connected to the normally closed static end of the second relay module and the other end of the discharge branch; the source of the NMOS tube Q2 is connected to the negative electrode of the power module;

[0025] Specifically, the capacitor C1 adopts a safety capacitor;

[0026] Specifically, the value of the capacitor C1 is 0.47 μF to 1 μF;

[0027] Specifically, the value of the resistor is tens of ohms to hundreds of ohms;

[0028] More preferably, the resistor is composed of resistors R1 and R2 connected in parallel, which can increase its ability to withstand the release of electrical energy.

[0029] When the motor M1 rotates forward, the control module controls the first relay module to connect its normally open static end (terminal 1) with the dynamic end (terminal 2), and disconnect the dynamic end (terminal 2) from the normally closed static end (terminal 3); the control module controls the second relay module to connect its dynamic end (terminal 2) with the normally closed static end (terminal 3), and disconnect the normally open static end (terminal 1) from the dynamic end (terminal 2); at the same time, the NMOS tube Q2 is controlled to be turned on and the NMOS tube Q1 is turned off; the positive pole of the motor M1 is connected to the positive pole of the power supply, the negative pole of the motor M1 is connected to the negative pole of the power supply, and the motor M1 starts to rotate forward; when the motor M1 needs to stop running, the control module sends a control instruction to turn off the NMOS tube Q2, then the negative pole of the motor M1 is disconnected from the negative pole of the power supply, and the motor M1 is powered off. Due to the residual electric energy in the motor, the negative pole voltage of the motor M1 increases, and the motor M1 cannot stop running immediately;

[0030] At this time, the control module sends a control instruction to turn on the NMOS tube Q1. Figure 1The right end of the middle capacitor C1 is connected to the negative electrode of the motor M1 through a resistor as the end with a high voltage, and the left end of the capacitor C1 is connected to the negative electrode of the power module as the end with a low voltage through an NMOS tube Q1; the residual electric energy in the motor M1 will charge the capacitor C1, and during the charging process, the resistor will consume the residual electric energy and convert it into heat and dissipate it;

[0031] When the motor M1 reverses, the control module controls the second relay to connect its normally open static end (end 1) with the dynamic end (end 2), and disconnect the dynamic end (end 2) from the normally closed static end (end 3). The control module controls the first relay module to connect its dynamic end (end 2) with the normally closed static end (end 3), and disconnect the normally open static end (end 1) from the dynamic end (end 2). At the same time, the NMOS tube Q1 is controlled to be turned on and the NMOS tube Q2 is turned off. The positive pole of the motor M1 is connected to the negative pole of the power supply, and the negative pole of the motor M1 is connected to the positive pole of the power supply, and the motor M1 starts to reverse. When the motor M1 needs to stop running, the control module sends a control instruction to turn off the NMOS tube Q1, then the positive pole of the motor M1 is disconnected from the negative pole of the power supply, and the motor M1 is powered off. Due to the residual electric energy in the motor, the positive pole voltage of the motor M1 increases, and the motor M1 cannot stop running immediately.

[0032] At this time, the control module sends a control instruction to turn on the NMOS tube Q2. Figure 1 The left end of the middle capacitor C1 is connected to the positive electrode of the motor M1 as the high voltage end, and the right end of the capacitor C1 is connected to the negative electrode of the power module as the low voltage end through the resistor and the NMOS tube Q2; the residual electric energy in the motor M1 will charge the capacitor C1. During the charging process, the resistor will consume the residual electric energy and convert it into heat and dissipate it.

[0033] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A motor residual energy release circuit, applicable to a motor drive circuit; The motor drive circuit includes a power module, a control module, a first relay module and a second relay module; the first relay module and the second relay module each include a control terminal, a normally open static terminal, a dynamic terminal and a normally closed static terminal; The control module is connected to the control ends of the first relay module and the second relay module respectively; the positive pole of the power module is connected to the first relay module, the second relay module and the normally open static end; the positive pole of the motor M1 is connected to the static end of the first relay module, and the negative pole of the motor M1 is connected to the static end of the second relay module; It is characterized in that The motor residual energy release circuit includes an NMOS tube Q1, an NMOS tube Q2, a capacitor C1 and a resistor; the capacitor C1 and the resistor are connected in series to form a discharge branch; The gate of the NMOS tube Q1 is connected to the control module, and the drain is connected to the normally closed static end of the first relay module and one end of the discharge branch; the source of the NMOS tube Q1 is connected to the negative electrode of the power module; The gate of the NMOS tube Q2 is connected to the control module, the drain is connected to the normally closed static end of the second relay module and the other end of the discharge branch; the source of the NMOS tube Q2 is connected to the negative electrode of the power module.

2. The motor residual energy release circuit according to claim 1, characterized in that: The capacitor C1 is a safety capacitor.

3. The motor residual energy release circuit according to claim 1, characterized in that: The value of the capacitor C1 is 0.47 μF to 1 μF.

4. The motor residual energy release circuit according to claim 1, characterized in that: The value of the resistor is in the range of tens of ohms to hundreds of ohms.

5. The motor residual energy release circuit according to claim 1, characterized in that: The resistor is formed by connecting resistors R1 and R2 in parallel.

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