CN117955367A - Motor band-type brake system, control method thereof and crane controller - Google Patents
Motor band-type brake system, control method thereof and crane controller Download PDFInfo
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- CN117955367A CN117955367A CN202211331577.1A CN202211331577A CN117955367A CN 117955367 A CN117955367 A CN 117955367A CN 202211331577 A CN202211331577 A CN 202211331577A CN 117955367 A CN117955367 A CN 117955367A
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Abstract
The invention discloses a motor band-type brake system and a control method thereof, wherein the motor band-type brake system comprises: the switching circuit is connected with the rectifying circuit; the rectification circuit is used for being connected with an alternating current power supply; the switching circuit at least comprises a first switch and a second switch, wherein the first end of the first switch is connected with the first end of the rectifying circuit, and the second end of the first switch is connected with the first end of the band-type brake coil; the first end of the second switch is connected with the second end of the rectifying circuit, the second end of the second switch is connected with the second end of the band-type brake coil, and the second switch is a semiconductor switch; the processor is connected with the switch circuit and is used for sending a control instruction for controlling the on/off of the switch circuit to the switch circuit so as to control the power on/off of the band-type brake coil by utilizing the first switch and/or the second switch and further control whether the motor band-type brake is or not. Through the mode, hardware redundancy on the switches can be achieved, and the situation that one of the switches is stuck to cause the brake coil to be unable to break the power is prevented.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a motor band-type brake system, a control method thereof and a crane controller.
Background
In order to prevent under the circumstances of suddenly losing the power, motor stop operation is driven by equipment is reverse, needs installation motor band-type brake system, band-type brake structure can be rapidly with the motor locking, prevents the condition emergence that equipment falls.
Traditional band-type brake circuit often adopts contactor control band-type brake coil power output break-make, and when the contactor became invalid, the contact was stuck, band-type brake would unable outage to the dangerous accident that the motor can't stop appears.
Disclosure of Invention
The invention mainly solves the technical problem of providing a motor band-type brake system, a control method thereof and a crane controller, which can improve the safety of the motor band-type brake system, achieve the hardware redundancy of switches and prevent the band-type brake coil from being unable to be powered off due to the adhesion of one switch.
In order to solve the technical problems, the invention adopts a technical scheme that: the motor band-type brake control system comprises a rectifying circuit, a switching circuit, a band-type brake coil and a processor, wherein the rectifying circuit is used for being connected with an alternating current power supply; the switching circuit at least comprises a first switch and a second switch, wherein the first end of the first switch is connected with the first end of the rectifying circuit, and the second end of the first switch is connected with the first end of the band-type brake coil; the first end of the second switch is connected with the second end of the rectifying circuit, and the second end of the second switch is connected with the second end of the band-type brake coil; the second switch is a semiconductor switch; the processor is connected with the switch circuit and is used for sending a control instruction for controlling the on/off of the switch circuit to the switch circuit so as to control the power on/off of the band-type brake coil by utilizing the first switch and/or the second switch and further control whether the motor band-type brake is or not.
In an embodiment, the motor band-type brake system further comprises a coil current detection circuit, wherein the coil current detection circuit is arranged between the first end of the rectifying circuit and the first end of the first switch or between the second end of the rectifying circuit and the first end of the second switch and is used for detecting the current of the band-type brake coil.
In one embodiment, the motor band-type brake system further comprises a coil voltage detection circuit connected with the first end and the second end of the band-type brake coil and used for detecting voltages at two ends of the band-type brake coil.
In one embodiment, the motor band-type brake system further comprises a frequency conversion circuit and a motor current detection circuit, wherein the frequency conversion circuit is used for connecting a power supply and a motor to supply power to the motor; the motor current detection circuit is arranged between the frequency conversion circuit and the motor and is used for detecting the current of the motor.
In one embodiment, the first switch of the motor band-type brake system is a relay switch.
In one embodiment, the motor band-type brake system further comprises a first absorption circuit and a second absorption circuit, wherein a first end of the first absorption circuit is connected with a first end of the band-type brake coil, and a second end of the first absorption circuit is connected with a second end of the band-type brake coil; the first end of the second absorption circuit is connected with the first end of the second switch, and the second end of the second absorption circuit is connected with the second end of the second switch.
In an embodiment, the first snubber circuit includes a first resistor and a first diode connected in series with each other, and the second snubber circuit includes a second resistor, a second diode, and a first capacitor, where the second resistor is connected in series with the second diode, and the second resistor is connected in parallel with the first capacitor.
In one embodiment, the motor band-type brake system further comprises a power circuit breaker and a power contactor, wherein the power circuit breaker is arranged between the alternating current power supply and the power contactor; the power contactor is arranged between the power circuit breaker and the rectifying circuit.
In one embodiment, the processor is connected with the coil current detection circuit and is used for acquiring the current value of the band-type brake coil detected by the coil current detection circuit; the processor is connected with the coil voltage detection circuit and used for acquiring the voltage value of the band-type brake coil detected by the coil voltage detection circuit; the processor is connected with the motor current detection circuit and is used for acquiring the current value of the motor detected by the motor current detection circuit.
In order to solve the above technical problems, the present invention provides a control method of a motor band-type brake system, where the motor band-type brake system may be any one of the motor band-type brake systems described in the above embodiments, the control method includes: receiving a conduction instruction, conducting the first switch, delaying for a first preset time, and then conducting the second switch to control the band-type brake coil to be electrified; or receiving an off instruction, switching off the second switch, and switching off the first switch after a predetermined time delay to control the brake coil to be powered off so as to control the motor brake.
In one embodiment, the motor band-type brake system control method further includes: determining whether a coil current value and a coil voltage value are acquired, wherein the coil current value is the current of the band-type brake coil, and the coil voltage value is the voltage of the band-type brake coil; in response to acquiring the coil current value and the coil voltage value, acquiring the conduction states of the first switch and the second switch; generating a first control instruction to control to turn off the power contactor and send out a first fault notification in response to any one of the first switch and the second switch not being turned on; in response to the first switch and the second switch being in a conducting state, judging whether the coil current value and the coil voltage value meet a first preset condition; and generating a second control instruction to control to turn off the second switch first, turn off the first switch after delaying for a second preset time and send out a second fault notification in response to any one of the coil current value and the coil voltage value not meeting a first preset condition.
In one embodiment, the motor band-type brake system control method further includes: confirming whether a coil current value and a coil voltage value are acquired, wherein the coil current value is the current of the band-type brake coil, and the coil voltage value is the voltage of the band-type brake coil; acquiring the conduction states of the first switch and the second switch in response to the fact that the coil current value and the coil voltage value are not acquired; and generating a third control instruction to control the frequency conversion circuit to be closed and send out a third fault notification in response to the first switch and the second switch being in the on state.
In one embodiment, the motor band-type brake system control method further includes: switching on a power circuit breaker and a power contactor; turning on a first switch to determine whether a coil current value and a coil voltage value are acquired, wherein the coil current value is the current of a band-type brake coil, and the coil voltage value is the voltage of the band-type brake coil; generating a first control instruction to control to turn off the power contactor and send out a fourth fault notification in response to the obtained coil current value and coil voltage value; in response to not obtaining the coil current value and the coil voltage value, turning off the first switch, turning on the second switch, and determining again whether the coil current value and the coil voltage value are obtained; in response to the acquisition of the coil current value and the coil voltage value, a first control instruction is generated to control the power supply contactor to be turned off, and a fifth fault notification is sent out.
In one embodiment, the motor band-type brake system control method further includes: and receiving the emergency stop instruction, generating a fourth control instruction to control the power circuit breaker to be turned off, turning off the second switch, and turning off the first switch after delaying for a second preset time.
In order to solve the technical problems, the invention provides a crane controller, which comprises the motor band-type brake system in any embodiment.
The beneficial effects of the invention are as follows: compared with the prior art, the motor band-type brake system and the control method thereof provided by the invention have the advantages that the first switch and the second switch are arranged to control the electric/power-off of the band-type brake coil, so that whether the motor band-type brake is powered on or not is controlled, the redundant design on the switches can be achieved, the safety of the motor band-type brake system is improved, namely, if one of the switches is adhered to cause that the band-type brake coil cannot be powered off, the other switch can be used for controlling, the band-type brake cannot be powered off, so that the risk caused by the incapacity of stopping the motor is avoided, the second switch is a semiconductor switch, the response speed is high, and the contact of a contactor cannot be drawn to arc by forced disconnection, so that sparks are generated. Through the mode, the safety and reliability of the motor band-type brake system can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, it will be apparent that the following description refers to only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a motor band brake system in an embodiment of the invention;
FIG. 2 is a schematic diagram of a motor band-type brake system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a motor band-type brake system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a motor band-type brake system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a motor band brake system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a motor band brake system in an embodiment of the invention;
FIG. 7 is a schematic diagram of a crane controller in an embodiment of the invention;
FIG. 8 is a schematic flow chart of a control method of a motor band-type brake system in an embodiment of the invention;
FIG. 9 is a schematic flow chart of a control method of a motor band-type brake system in an embodiment of the invention;
FIG. 10 is a schematic flow chart of a control method of a motor band-type brake system in an embodiment of the invention;
fig. 11 is a flow chart of a control method of the motor band-type brake system in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and more specific, the present invention will be described in further detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a motor band-type brake system according to an embodiment of the invention. In this embodiment, the motor band-type brake system includes a rectifying circuit 10, a switching circuit 30, and a band-type brake coil 20. The rectifier circuit 10 is connected to an ac power supply 60, and the rectifier circuit 10 converts ac power into dc power and supplies the dc power to the band-type brake coil 20. The rectifying circuit 10 may be a half-wave rectifier for connecting R, T two phases of a three-phase power supply.
The switch circuit 30 comprises a first switch 31 and a second switch 32, wherein a first end of the first switch 31 is connected with a first end of the rectifying circuit 10, and a second end of the first switch 31 is connected with a first end of the band-type brake coil 20; a first end of the second switch 32 is connected to a second end of the rectifying circuit 10, and a second end of the second switch 32 is connected to a second end of the band-type brake coil 20.
The switch is designed in a redundancy mode by setting a plurality of switches to control the power-on/power-off of the band-type brake coil, and the safety and the reliability of the motor band-type brake system can be improved by controlling the power-on/power-off , of the band-type brake coil through other switch devices when one switch is stuck.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a motor band-type brake system according to an embodiment of the application. In this embodiment, the motor band-type brake system further includes a frequency conversion circuit 80, and the frequency conversion circuit 80 is used for connecting a power supply and a motor. The frequency conversion circuit 80 is a unit for providing power output for the motor, the input end of the frequency conversion circuit 80 is connected with a three-phase power supply, and the output end of the frequency conversion circuit 80 is connected with the motor. According to the application, whether the motor band-type brake is powered on or off can be controlled by controlling the band-type brake coil to power on/off.
Specifically, the main structure of the band-type brake coil comprises a brake electromagnet and a brake shoe brake, wherein the brake electromagnet consists of a core, an armature and a coil, and the brake shoe brake comprises a brake shoe, a brake wheel, a spring and the like. The brake wheel and the motor are arranged on the same rotating shaft. When the motor is electrified, the band-type brake coil is controlled to be electrified, the armature is attracted, the brake shoe of the brake is separated from the brake wheel by overcoming the pulling force of the spring, and the motor normally operates. When the motor is powered off, the band-type brake coil is controlled to be powered off, the armature is separated from the iron core under the action of the tension of the spring, and the brake shoe of the brake tightly holds the brake wheel, so that the motor is braked and stops running. The band-type brake coil is used for controlling the motor to brake through a magnetic field, and when the motor suddenly stops or suddenly fails, the band-type brake structure can rapidly lock the motor, so that the motor is prevented from being driven reversely by equipment, and the equipment is prevented from falling.
Wherein, the on/off of the band-type brake coil can be controlled by controlling the on/off of the switch circuit 30. In this embodiment, the switching circuit 30 includes at least a first switch 31 and a second switch 32.
In an embodiment, the second switch Q1 (32) is a semiconductor switching device, and the semiconductor switching device has no mechanical delay, has a fast response speed, and can realize fast turn-off of the band-type brake coil, namely, can rapidly cut off current, and realize short-circuit and overcurrent protection. The semiconductor switching device may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), a Bipolar Junction Transistor (BJT), an Insulated Gate Bipolar Transistor (IGBT), a thyristor (SCR GTO MCT), or the like.
The first switch K1 (31) may be a relay switching device, or may be a semiconductor switching device as in the second switch Q1.
In an embodiment, the first end of the rectifying circuit is the positive output end of the rectifying circuit, the second end of the rectifying circuit is the negative output end of the rectifying circuit, that is, the first end of the first switch K1 is connected with the positive output end of the rectifying circuit 10, and the second end of the first switch K1 is connected with the first end of the band-type brake coil 20; the first end of the second switch Q1 is connected to the negative output end of the rectifying circuit 10, and the second end of the second switch Q1 is connected to the second end of the band-type brake coil 20.
In another embodiment, the first end of the rectifying circuit is a negative output end of the rectifying circuit, the second end of the rectifying circuit is a positive output end of the rectifying circuit, that is, the first end of the second switch Q1 may be connected to the positive output end of the rectifying circuit 10, the second end of the second switch Q1 is connected to the first end of the band-type brake coil 20, the first end of the first switch K1 is connected to the negative output end of the rectifying circuit 10, and the second end of the first switch K1 is connected to the first end of the band-type brake coil 20, that is, the positions of the first switch K1 and the second switch Q1 may be interchanged.
Further, the motor band-type brake system further comprises a power contactor KM1 and a power breaker QF1, wherein the power breaker QF1 is arranged between the alternating current power supply and the power contactor KM 1; the power contactor KM1 is provided between the power breaker QF1 and the rectifying circuit 10. When the switch circuit 30 fails, the brake coil 20 cannot be controlled to be powered off, and the power supply can be cut off through the power breaker QF1 and the power contactor KM1, so that the protection of a power line and a motor is realized. If the rear end has extreme faults and has high current, the power breaker QF1 can be automatically disconnected to play a role of protection.
In the embodiment, the power-on/power-off of the band-type brake coil is controlled by arranging the power contactor, the power breaker and the two switching devices, so that the redundancy design of the switch is realized, and the safety and the reliability of the motor band-type brake system are improved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a motor band-type brake system according to an embodiment of the present invention, where the motor band-type brake system further includes a coil current detection circuit 131 and a coil voltage detection circuit 130, and the coil current detection circuit 131 is disposed between a first end of the rectifying circuit 10 and a first end of the first switch K1, or between a second end of the rectifying circuit 10 and a first end of the second switch Q1, for detecting a current of the band-type brake coil 20. The coil voltage detection circuit 130 is connected to the first end and the second end of the band-type brake coil 20, and is used for detecting voltages at two ends of the band-type brake coil 20. In one embodiment, the coil current detection circuit 131 is disposed between the negative output terminal of the rectifying circuit 10 and the second terminal of the band-type brake coil 20.
In another embodiment, the motor band-type brake system may be provided with only the coil current detection circuit 131 or only the coil voltage detection circuit 130.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a motor band-type brake system according to an embodiment of the present invention, as shown in fig. 4, where the motor band-type brake system further includes a motor current detection circuit 132. The motor current detection circuit 132 is provided between the frequency conversion circuit 80 and the motor for detecting the current of the motor.
In the above embodiment, the voltage sampling mode may be high-resistance differential sampling or isolation sampling, and the current sampling mode may be resistance isolation sampling or hall sampling.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a motor band-type brake system according to an embodiment of the invention, where the motor band-type brake system further includes a first absorption circuit 100 and a second absorption circuit 120.
Wherein, the first end of the first absorption circuit 100 is connected with the first end of the band-type brake coil 20, and the second end of the first absorption circuit 100 is connected with the second end of the band-type brake coil 20. The first absorption circuit 100 is used as a follow current absorption loop of the band-type brake coil, and can prevent the voltage caused by the reverse induced electromotive force from damaging the second switch.
Further, the first snubber circuit 100 includes a first resistor R1 and a first diode D1 connected in series with each other. In other embodiments, the first absorption circuit 100 may also have other equivalent circuit structures, for example, the resistor, the number of diodes, and the parameters are not limited.
The first terminal of the second snubber circuit 120 is connected to the first terminal of the second switch Q1, and the second terminal of the second snubber circuit 120 is connected to the second terminal of the second switch Q1. The second absorbing circuit 120 is configured to absorb a spike voltage across the second switch Q1 to protect the second switch Q1.
Further, the second snubber circuit 120 includes a second resistor R2, a second diode D2, and a first capacitor C1. The second resistor R2 and the second diode D2 are connected in series, and the second resistor R2 and the first capacitor C1 are connected in parallel. In other embodiments, the second absorption circuit may also be other equivalent circuit structures, for example, the resistor, the number of diodes and the parameters are not limited.
Specifically, in this embodiment, a first end of the first switch K1 is connected to the positive output end of the rectifying circuit 10, and a second end of the first switch K1 is connected to the first end of the band-type brake coil 20; the second end of the first switch K1 is further connected to the first end of the first resistor R1 of the first absorption circuit 100, the second end of the first resistor R1 is connected to the first end of the first diode D1, and the second end of the first diode D1 is connected to the first end of the band-type brake coil 20. The first end of the first diode D1 is a negative end, and the second end of the first diode D1 is a positive end.
The first end of the second switch Q1 is connected with the negative electrode output end of the rectifying circuit 10, the second end of the second switch Q1 is respectively connected with the first end of the second resistor R2 and the first end of the first capacitor C1, the first end of the first capacitor C1 is also connected with the second end of the band-type brake coil 20, the second end of the second resistor R2 is respectively connected with the second end of the first capacitor C1 and the first end of the second diode D2, and the second end of the second diode D2 is connected with the negative electrode output end of the rectifying circuit 10. The first end of the second diode D2 is a negative end, and the second end of the second diode D2 is a positive end. The first end of the second switch Q1 is an input end, and the second end of the second switch Q1 is an output end.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a motor band-type brake system according to an embodiment of the invention. When the first switch K1 and the second switch Q1 change the setting positions, the second snubber circuit 120 is also changed along with the change of the position of the second switch Q1, that is, the first end of the second snubber circuit 120 needs to be connected to the first end of the second switch Q1, and the second end of the second snubber circuit 120 is connected to the second end of the second switch Q1.
Specifically, in this embodiment, a first end of the first switch K1 is connected to the negative output terminal of the rectifying circuit 10, and a second end of the first switch K1 is connected to the second end of the band-type brake coil 20.
The first end of the second switch Q1 is connected with the positive electrode output end of the rectifying circuit 10, the first end of the second switch Q1 is respectively connected with the first end of the second resistor R2 and the first end of the first capacitor C1, the first end of the first capacitor C1 is also connected with the first end of the band-type brake coil 20, the second end of the first resistor R1 is connected with the first end of the second diode D2, and the second end of the second diode D2 is connected with the second end of the second switch Q1. The second end of the second resistor R2 is connected to the second end of the first capacitor C1 and the first end of the second diode D2, respectively. The first end of the second diode D2 is a negative end, and the second end of the second diode D2 is a positive end. The first end of the second switch Q1 is an output end, and the second end of the second switch Q1 is an input end.
In the above embodiment, when the motor works normally, the first switch K1 and the second switch Q1 are engaged, the three-phase ac power supply 60 supplies power to the rectifying circuit 10 and the frequency conversion circuit 80, the motor is powered, the band-type brake coil 20 is powered, and the band-type brake coil 20 controls the motor to brake through the magnetic field. When the motor is powered off, the first switch K1 and the second switch Q1 are turned off, the band-type brake coil 20 is powered off, and the motor is controlled to brake and stop running.
In the above embodiment, through adopting the redundant design control band-type brake power output of first switch K1, second switch Q1 and power contactor KM1, prevent that one of them switch from sticking the unable outage of band-type brake coil that leads to, promptly when one of them device contact inefficacy, can realize the control to band-type brake coil electricity/outage through other devices.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a crane controller according to an embodiment of the invention. As shown, crane controller 200 includes a motor band brake system as in any of the embodiments described above. When the crane equipment suddenly loses power, the motor is reversely driven by the crane equipment to run, and dangerous accidents are easy to occur. The motor band-type brake system provided by the invention can rapidly lock the motor and prevent equipment from falling. The braking force of the crane is enhanced, the safety coefficient of the crane is improved, and further the personal safety of people is ensured.
The motor band-type brake system provided by the invention can be applied to the technical field of crane control, and can be particularly applied to elevator equipment, construction elevator equipment and the like.
In one embodiment, the motor band-type brake system further includes a processor (not shown), which may be an MCU (Microcontroller Unit, MCU, micro-control unit).
The processor is connected with the switch circuit and is used for sending a control instruction for controlling the on/off of the switch circuit to the switch circuit so as to control the power on/off of the band-type brake coil by utilizing the first switch and/or the second switch and further control whether the motor band-type brake is or not. Further, the processor is connected with the control ends of the first switch and the second switch respectively.
The processor is connected with the coil current detection circuit and is used for acquiring the current value of the band-type brake coil detected by the coil current detection circuit.
The processor is connected with the coil voltage detection circuit and is used for acquiring the voltage value of the band-type brake coil detected by the coil voltage detection circuit.
The processor is connected with the motor current detection circuit and is used for acquiring the current value of the motor detected by the coil current detection circuit.
Specifically, when the first switch K1 is a relay switch and the second switch Q1 is a semiconductor switch, the processor may control on/off timing sequences of the first switch K1 and the second switch Q1 to reduce an influence of peak voltage generated when the electromagnetic coil is turned on/off on the contactor contact, and meanwhile, the relay switch is not switched under load, and arcing is formed at the contact when the relay switch is switched under load, so that the relay contact is oxidized.
The processor can carry out closed-loop detection on the band-type brake circuit according to the detected current, voltage and current of the motor, and logic correctness of the band-type brake circuit is ensured through closed-loop detection. Checking whether the band-type brake circuit is normal or not, and the like.
Referring to fig. 8, fig. 8 is a flowchart of a control method of a motor band-type brake system according to an embodiment of the invention. The embodiment is a brake opening control method of a motor brake system, comprising the following steps:
The motor band-type brake system receives a starting instruction, starts the frequency conversion circuit 80, detects the brake opening frequency, when the brake opening frequency is reached, the motor current detection circuit 132 is used for collecting a current signal of the motor, the collected current signal is sent to the processor, the processor is used for judging whether the motor current reaches a preset value, and when the motor current reaches the preset value, the motor starting condition is met, and the band-type brake circuit is required to be conducted so as to release the limitation of the motor. Specifically, the processor generates a conduction command and sends the conduction command to the switching circuit to control the switching circuit to conduct the switch.
The first switch K1 may be turned on by a pilot, and the second switch Q1 may be turned on after a first predetermined time delay to control the band-type brake coil 20 to be powered on. The first switch K1 is a relay switch, and the second switch Q1 is a semiconductor switch. For example, the first switch K1 is turned on, and the second switch Q1 is turned on after a delay of 200ms, where the delay is to prevent the first switch K1 from being attracted by load, reduce the damage of the contact of the first switch K1, and the specific delay time can be tested according to an actual circuit. When the motor current does not reach the predetermined value, a fault notification is returned.
Referring to fig. 9, fig. 9 is a flowchart of a control method of a motor band-type brake system according to an embodiment of the invention. The embodiment is a method for controlling the closing (band-type brake) of a motor band-type brake system, comprising the following steps:
under the normal working state of the motor, the motor band-type brake system receives a stop instruction, controls the frequency conversion circuit 80 to stop in a decelerating way, and notifies the turn-off of the band-type brake circuit when the brake closing frequency is reached, so that the limitation of the motor is realized. Specifically, the processor generates a turn-off instruction and sends the turn-off instruction to the switching circuit to control the switching circuit to turn off the switch. Specifically, the processor controls the second switch Q1 to be turned off first, and controls the first switch K1 to be turned off after delaying for a second preset time, so as to control the brake coil to be powered off and further control the motor brake. The delay is to prevent the first switch K1 from being cut off under load, and reduce damage to the contacts of the first switch K1, for example: the second predetermined time may be 200ms and the specific time may be set to other durations depending on the actual circuit test.
When the motor works abnormally, the motor band-type brake system receives an emergency stop instruction and controls to turn off the power circuit breaker QF1 and the first switch K1. The emergency stop instruction is an instruction for triggering the hardware to block the band-type brake. I.e. forced turning off of the power circuit breaker QF1 and the first switch K1 by mechanical control. And meanwhile, sending an emergency stop instruction to the processor so that the processor sends a fourth control instruction to control the power circuit breaker to be turned off, turning off the second switch Q1, and turning off the first switch K1 after delaying for a second preset time. When the emergency happens, the mechanical switch is turned off by mechanical force, and meanwhile, the emergency stop finger is sent to the processor, so that the second switch Q1 and the first switch K1 are turned off by software in sequence, and double control is realized, so that the safety turn-off can be ensured.
In the implementation method, the on/off time sequence of the first switch and the second switch is controlled, so that the first switch can be prevented from being attracted/cut off under load, arc discharge is prevented from being formed at the contact point of the relay switch, and the service life of the relay switch device is prolonged.
Referring to fig. 10, fig. 10 is a flowchart of a control method of a motor band-type brake system according to an embodiment of the application. The embodiment is a self-checking control method of a motor band-type brake system. In order to ensure that the motor band-type brake system can normally operate, self-checking is carried out before the motor works, whether a switch circuit and a whole system circuit are normal or not can be effectively judged through the self-checking, and further rapid band-type brake can be realized when a stop instruction or an emergency stop instruction is received. The self-checking control method of the motor band-type brake system provided by the application comprises the following steps:
and a power circuit breaker QF1 and a power contactor KM1 are conducted to supply power for the motor band-type brake system.
And switching on the first switch K1 to determine whether a coil current value and a coil voltage value are acquired, wherein the coil current value is a current value of the band-type brake coil acquired by using the coil current detection circuit, and the coil voltage value is a voltage value of the band-type brake coil acquired by using the coil voltage detection circuit.
In response to the acquisition of the coil current value and the coil voltage value, a first control instruction is generated to control the power supply contactor to be turned off and a fourth fault notification is sent. The fourth fault notification is used for indicating that the second switch Q1 is turned off abnormally, and maintenance is needed.
Specifically, in this embodiment, whether or not there is an abnormality in each switching device is detected by turning on the switching devices one by one. However, when only the first switch K1 is turned on, in the circuit system, the second switch Q1 is in an off state, that is, the band-type brake circuit is in an off state, the coil current value and the coil voltage value are not acquired, if the coil current value and the coil voltage value are acquired, it is indicated that the second switch Q1 has an off abnormality, and the off circuit is turned on, that is, a fault exists.
In response to the coil current value and the coil voltage value not being acquired, the system circuit is illustrated as being in an open state, and it can be determined to some extent that the second switch Q1 can be normally in an off state. The detection of whether the second switch Q1 is normal is achieved. Likewise, a similar method can be used to detect whether the first switch K1 can be normally turned off, specifically as follows:
Turning off the first switch K1, turning on the second switch Q1, and determining whether a coil current value and a coil voltage value are acquired; in response to the acquisition of the coil current value and the coil voltage value, a first control instruction is generated to control the power supply contactor to be turned off, and a fifth fault notification is sent out. The fifth fault notification is used for indicating that the first switch K1 is turned off abnormally and needs to be overhauled.
Similarly, when the first switch K1 is in the off state and the system circuit is in the off state, if the coil current value and the coil voltage value are obtained, it is indicated that the off abnormality exists in the first switch K1, and the off line is turned on, that is, a fault exists. If the coil current value and the coil voltage value are not obtained, it can be determined to a certain extent that the first switch K1 can also be normally in the off state.
Further, when detecting that the fault is found, if the brake is required to be powered off, the power contactor can be controlled to be turned off to cut off the power supply, so that the power is ensured to be powered off. If the band-type brake is not required to be powered off, the other devices in the line can be continuously tried to be turned off so as to further determine the fault point.
In this embodiment, whether the first switch K1 and the second switch Q1 are normally turned off can be detected, and the situation that the switching device cannot be turned off due to direct conduction caused by contact sticking and the like is effectively avoided.
Referring to fig. 11, fig. 11 is a flowchart of a control method of a motor band-type brake system according to an embodiment of the application. The implementation mode is a motor band-type brake system fault detection control method. When the motor is in a running state, the first switch K1 and the second switch Q1 are in a conducting state, and in order to effectively monitor which devices have faults, the fault detection control method of the motor band-type brake system provided by the application comprises the following steps:
The processor determines whether a coil current value and a coil voltage value are acquired, wherein the coil current value is a current value of the band-type brake coil acquired by the coil current detection circuit, and the coil voltage value is a voltage value of the band-type brake coil acquired by the coil voltage detection circuit.
In response to the acquisition of the coil current value and the coil voltage value, the on states of the first switch K1 and the second switch Q1 are further acquired.
And generating a first control instruction to control the power supply contactor to be turned off and send out a first fault notification in response to the fact that any one of the first switch and the second switch is not turned on. The first fault notification is used for indicating that the first switch K1 or the second switch Q1 is abnormal in turn-off and needs to be overhauled.
Specifically, if any one of the first switch K1 and the second switch Q1 is not turned on, that is, should be in an off state, it is indicated that the band-type brake line is in an off state, but if the coil current value and the coil voltage value are not acquired, it is indicated that the first switch K1 or the second switch Q1 has an off abnormality, that is, a fault exists, because the off line is turned on.
And in response to the fact that the first switch K1 and the second switch Q1 are in the conducting state, judging whether the obtained coil current value and the obtained coil voltage value meet a first preset condition or not, wherein the first preset condition refers to whether the first preset condition exceeds a limit value or not, and the limit value refers to the coil current value and the coil voltage value of the collected band-type brake coil when the motor band-type brake system has no fault in the normal working state of the motor. I.e. the coil current value and the coil voltage value cannot be significantly lower than normal values, nor significantly higher than normal values. If any one of the coil current value and the coil voltage value exceeds the limit value, a second control instruction is generated to control the second switch Q1 to be turned off first, the first switch K1 to be turned off after a second preset time is delayed, and a second fault notification feedback that an abnormality occurs and maintenance is needed is sent.
Specifically, when the switching device works normally, if the coil current value/the coil voltage value is abnormal, which indicates that an abnormal point may exist on the line, when the motor band-type brake system fails, the band-type brake coil 20 cannot control the motor to brake, and if the motor band-type brake system is not overhauled in time, accidents may be caused. In this embodiment, by providing the coil current detection circuit 131 and the coil voltage detection circuit 130, the current and the voltage of the band-type brake coil 20 are collected, the on states of the first switch and the second switch are obtained, then, whether the current value and the voltage value exceed the limit values is judged, different control instructions are generated according to different faults, and the cause and the position of the faults can be effectively judged through the closed loop detection of the current and the voltage, so that the correction is performed, and the protection of the motor band-type brake system is improved.
Acquiring the conduction states of the first switch K1 and the second switch Q1 in response to the fact that the coil current value and the coil voltage value are not acquired; when the first switch K1 and the second switch Q1 are in a conducting state, a third fault notification is sent out, and the output of the frequency conversion circuit is closed. The third fault notification is used for indicating that the first switch K1 or the second switch Q1 is abnormal in conduction and needs to be overhauled.
Specifically, if the first switch K1 and the second switch Q1 are both turned on, it indicates that the band-type brake circuit is in a path state, and if the coil current value and the coil voltage value are not obtained, it indicates that other breaking points may exist in the system circuit and need to be overhauled.
In summary, the invention effectively solves the pain points of the traditional band-type brake circuit. Through adopting semiconductor switch, relay switch and power contactor control band-type brake power output to reach hardware redundancy, prevent that one of them switch from sticking and leading to the unable outage of band-type brake coil. And the on-off of the electromagnetic coil is reduced through the time sequence control of the semiconductor switch and the relay, the load cut-off of the first switch is avoided, the influence of peak voltage on the rectifying circuit, the relay switch and the contacts of the power contactor is prevented, and the service life of the relay switch device is prolonged.
Meanwhile, a plurality of voltage and current detection circuits are added to carry out closed-loop detection on the band-type brake circuit, and logic correctness of the band-type brake circuit is ensured through closed-loop detection. The motor band-type brake system further comprises a self-checking function, whether the band-type brake circuit is normal or not can be effectively judged through self-checking, and when all the control power supply output devices are damaged, the emergency stop signal can block the band-type brake control signal through hardware.
It should be noted that, the apparatus of this embodiment may perform the steps in the above method, and details of the related content refer to the above method section, which is not described herein again.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (15)
1. The motor band-type brake system is characterized by comprising a rectifying circuit, a switching circuit, a band-type brake coil and a processor;
The rectification circuit is connected with an alternating current power supply;
The switching circuit at least comprises a first switch and a second switch, wherein the first end of the first switch is connected with the first end of the rectifying circuit, and the second end of the first switch is connected with the first end of the band-type brake coil; the first end of the second switch is connected with the second end of the rectifying circuit, and the second end of the second switch is connected with the second end of the band-type brake coil; the second switch is a semiconductor switch;
the processor is connected with the switch circuit and is used for sending a control instruction for controlling the switch circuit to be turned on/off to the switch circuit so as to control the band-type brake to be electrified/powered off by utilizing the first switch and/or the second switch, and then whether the motor band-type brake is controlled or not.
2. A motor band-type brake system according to claim 1, further comprising:
And the coil current detection circuit is arranged between the first end of the rectifying circuit and the first end of the first switch or between the second end of the rectifying circuit and the first end of the second switch and is used for detecting the current of the band-type brake coil.
3. A motor band-type brake system according to claim 1, further comprising:
and the coil voltage detection circuit is connected with the first end and the second end of the band-type brake coil and is used for detecting the voltages at the two ends of the band-type brake coil.
4. A motor band-type brake system according to claim 1, further comprising:
the frequency conversion circuit is used for connecting a power supply and a motor to supply power to the motor;
And the motor current detection circuit is arranged between the frequency conversion circuit and the motor and is used for detecting the current of the motor.
5. A motor band-type brake system according to claim 1, wherein,
The first switch is a relay switch.
6. A motor band-type brake system according to claim 1, further comprising a first absorption circuit and a second absorption circuit;
the first end of the first absorption circuit is connected with the first end of the band-type brake coil, and the second end of the first absorption circuit is connected with the second end of the band-type brake coil;
The first end of the second absorption circuit is connected with the first end of the second switch, and the second end of the second absorption circuit is connected with the second end of the second switch.
7. A motor band-type brake system according to claim 6, wherein,
The first absorption circuit comprises a first resistor and a first diode which are mutually connected in series;
The second absorption circuit comprises a second resistor, a second diode and a first capacitor, wherein the second resistor and the second diode are connected in series, and the second resistor and the first capacitor are connected in parallel.
8. A motor band-type brake system according to claim 1, further comprising a power circuit breaker and a power contactor;
the power circuit breaker is arranged between the alternating current power supply and the power contactor;
the power contactor is disposed between the power circuit breaker and the rectifying circuit.
9. A motor band-type brake system according to claim 1, wherein,
The processor is connected with the coil current detection circuit and is used for acquiring the current value of the band-type brake coil detected by the coil current detection circuit;
the processor is connected with the coil voltage detection circuit and is used for acquiring the voltage value of the band-type brake coil detected by the coil voltage detection circuit;
The processor is connected with the motor current detection circuit and is used for acquiring the current value of the motor detected by the motor current detection circuit.
10. A method of controlling a motor band-type brake system, the motor band-type brake system being a motor band-type brake system as claimed in any one of claims 1 to 9, the method comprising:
Receiving a conduction instruction, conducting the first switch, delaying for a first preset time, and then conducting the second switch to control the band-type brake coil to be electrified; or (b)
And receiving a turn-off instruction, turning off the second switch, and delaying for a second preset time to turn off the first switch so as to control the break of the band-type brake coil and further control the motor band-type brake.
11. A method of controlling a motor band-type brake system according to claim 10, further comprising:
Determining whether a coil current value and a coil voltage value are obtained, wherein the coil current value is the current of a band-type brake coil, and the coil voltage value is the voltage of the band-type brake coil;
acquiring the conduction states of the first switch and the second switch in response to acquiring the coil current value and the coil voltage value;
generating a first control instruction to control to turn off a power contactor and send out a first fault notification in response to any one of the first switch and the second switch not being turned on;
Judging whether the coil current value and the coil voltage value meet a first preset condition or not in response to the first switch and the second switch being in a conducting state;
And generating a second control instruction to control the second switch to be turned off first, to delay the second preset time and then to turn off the first switch and to send out a second fault notification in response to any one of the coil current value and the coil voltage value not meeting the first preset condition.
12. A method of controlling a motor band-type brake system according to claim 10, further comprising:
Confirming whether a coil current value and a coil voltage value are obtained, wherein the coil current value is the current of a band-type brake coil, and the coil voltage value is the voltage of the band-type brake coil;
Acquiring the conduction states of the first switch and the second switch in response to the coil current value and the coil voltage value not being acquired;
And generating a third control instruction to control the frequency conversion circuit to be closed and send out a third fault notification in response to the first switch and the second switch being in the on state.
13. A method of controlling a motor band-type brake system according to claim 10, further comprising:
Switching on a power circuit breaker and a power contactor;
The first switch is conducted, whether a coil current value and a coil voltage value are obtained or not is determined, the coil current value is the current of the band-type brake coil, and the coil voltage value is the voltage of the band-type brake coil;
Generating a first control instruction to control to turn off a power contactor and send out a fourth fault notification in response to the obtained coil current value and the coil voltage value;
In response to not acquiring the coil current value and the coil voltage value, turning off the first switch, turning on the second switch, and determining again whether the coil current value and the coil voltage value are acquired;
In response to acquiring the coil current value and the coil voltage value, a first control instruction is generated to control to turn off the power contactor and to issue a fifth fault notification.
14. A method of controlling a motor band-type brake system according to claim 10, further comprising:
And receiving an emergency stop instruction, generating a fourth control instruction to control the power circuit breaker to be turned off, turning off the second switch, and turning off the first switch after delaying the second preset time.
15. A crane control comprising a motor band brake system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211331577.1A CN117955367A (en) | 2022-10-27 | 2022-10-27 | Motor band-type brake system, control method thereof and crane controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211331577.1A CN117955367A (en) | 2022-10-27 | 2022-10-27 | Motor band-type brake system, control method thereof and crane controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117955367A true CN117955367A (en) | 2024-04-30 |
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ID=90799065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211331577.1A Pending CN117955367A (en) | 2022-10-27 | 2022-10-27 | Motor band-type brake system, control method thereof and crane controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117955367A (en) |
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2022
- 2022-10-27 CN CN202211331577.1A patent/CN117955367A/en active Pending
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