CN220915180U - Circuit for driving double motors to cooperatively operate by adopting frequency converter - Google Patents
Circuit for driving double motors to cooperatively operate by adopting frequency converter Download PDFInfo
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- CN220915180U CN220915180U CN202322487265.6U CN202322487265U CN220915180U CN 220915180 U CN220915180 U CN 220915180U CN 202322487265 U CN202322487265 U CN 202322487265U CN 220915180 U CN220915180 U CN 220915180U
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Abstract
The utility model relates to a circuit for driving double motors to cooperatively operate by adopting a frequency converter, which comprises a power frequency loop and a frequency conversion loop, wherein the power frequency loop is provided with a power frequency loop sampling device, the frequency converter on the frequency conversion loop is connected with the power frequency loop sampling device through a sampling signal wire so as to acquire real-time operation data of the power frequency motor on the power frequency loop, and the operation state of the frequency conversion motor on the frequency conversion loop is regulated by regulating the amplitude and the frequency of output voltage according to the acquired sampling signal, so that cooperative operation control of the two motors is realized, the power frequency motor and the frequency conversion motor are mutually independent, and can respectively drive respective load equipment and cooperatively drive the same load equipment after being mechanically coupled through a coupling mechanism, a clutch and the like.
Description
Technical Field
The utility model relates to an electrical equipment control circuit, in particular to a circuit for driving double motors to cooperatively operate by adopting a frequency converter, and belongs to the technical field of frequency converter electrical control.
Background
With the development of industry at a high speed, an industrial control system is increasingly developed and matured, a frequency converter is widely applied to various industrial control systems, and particularly, a transmission system with two motors is frequently encountered in production, wherein the transmission system with two motors refers to a production machine or two motors in a process section synchronously run, and due to the aspects of power, machinery and the like, certain constraint relation exists between the running of the two motors, and the two motors are required to cooperatively drive loads. In the current production process, the method for realizing the cooperative operation control of the two motors by adopting the frequency converter mainly comprises the following two steps:
1. two frequency converters are used for respectively driving two motors, and the two frequency converters are cooperatively controlled through communication interaction;
2. and a frequency converter with larger power is adopted to drive two motors simultaneously, so that the same driving control of the two motors is realized.
In the scheme for driving the two motors to cooperatively operate by using the frequency converters, the first scheme needs two frequency converters, the second scheme needs a frequency converter with larger power, and the problem of unbalanced power caused by the parameter difference of the two motors cannot be effectively solved. In combination with specific production process requirements, the motor is not required to be regulated basically in part of application sites, the purpose of using two frequency converters is only to realize soft start and power balance of the two motors, and in the prior art, the two motors are required to be driven by the two frequency converters respectively or a scheme of simultaneously driving a high-power frequency converter is adopted, so that the input cost of frequency conversion equipment is increased.
At present, patent application document with the authority of CN217388568U in the prior art discloses a control circuit for realizing power balance of a plurality of synchronous motors, which realizes control of n+1 motors through n frequency converters, but in a specific scheme, the n+1 motors are required to be connected by mechanical coupling elements, and when two motors are independent and have no connection relationship, the prior art cannot solve the problem of cooperative operation control of the two motors.
Disclosure of Invention
The utility model aims to solve the problems in the prior art, and designs a circuit for driving double motors to cooperatively operate by adopting one frequency converter, wherein the circuit only adopts one frequency converter, real-time operation data of the power frequency motor is firstly obtained through a power frequency loop sampling device, then the operation state of the frequency conversion motor is adjusted by adjusting the output voltage amplitude and frequency of the frequency converter, no matter whether a physical connection relation exists between the two motors, the cooperative control of the double motors can be realized, the rated power of the frequency converter only needs to be matched with the rated power of the corresponding frequency conversion motor, and the input cost of frequency converter equipment in an industrial control system is reduced.
The utility model is realized in the following way: a circuit for driving double motors to cooperatively operate by adopting a frequency converter is characterized in that: the circuit include power frequency return circuit and frequency conversion return circuit, the power frequency return circuit include with the power frequency return circuit sampling device VAS, switch QFs and a power frequency motor Ms that the electric wire netting busbar circuit connection in proper order, the frequency conversion return circuit include with the electric wire netting busbar circuit connection in proper order switch QF, a converter VFD and a frequency conversion motor M, through power frequency motor Ms and frequency conversion motor M drive the load equipment operation work, converter VFD connect the power frequency return circuit sampling device VAS that is used for obtaining the real-time operation data of power frequency motor Ms through the sampling signal line to according to the sampling signal that obtains, adjust frequency conversion motor M running state through the regulation of output voltage amplitude and frequency, realize the collaborative operation control to two motors.
The sampling signals of the power frequency loop sampling device comprise voltage sampling signals and current sampling signals, and the sampling signals of the sampling signal line are voltage and current sampling analog quantity signals or digital quantity signals containing power frequency loop voltage, current, power and frequency information.
Further, the output end of the converter VFD is provided with two paths, one path is sequentially provided with a reactor and a switch KMs for synchronous switching and is connected to the power frequency motor Ms through a circuit, so that the converter VFD can realize soft start of the power frequency motor Ms, the other path is connected to the converter motor M through a circuit after the switch KM is arranged, and the switch KM and the switch KMs respectively adopt a circuit breaker or a contactor.
The power frequency motor Ms and the variable frequency motor M respectively drive respective load devices through respective corresponding couplings, or the two motors are connected through a mechanical coupling mechanism comprising a coupling, a clutch, a gear box and a transmission belt and then jointly drive the same load device. In the starting process, the coupler, the clutch, the gear box and the driving belt are in a separated state, the two motors are correspondingly in a separated state on the mechanical connection structure, and after the power frequency motor Ms finishes starting, the coupler, the clutch, the gear box and the driving belt are in a mechanical coupling connection state and jointly drive the same load equipment.
The switch QFs and the switch QF are respectively a breaker or a contactor.
The power frequency motor and the variable frequency motor are one or two selected from the alternating current asynchronous motor, the alternating current excitation synchronous motor and the alternating current permanent magnet synchronous motor.
The power grid bus for supplying power to the power frequency motor Ms and the frequency converter VFD is the same power grid bus or two different power grid buses.
When the power frequency motor is not required to be started by a frequency converter, the power frequency loop sampling device VAS can also be arranged between the switch QFS and the power frequency motor.
The beneficial effects of the utility model are as follows: the utility model only adopts one frequency converter, firstly obtains real-time operation data of the power frequency motor through the power frequency loop sampling device, then adjusts the operation state of the frequency conversion motor through adjusting the amplitude and the frequency of the output voltage of the frequency converter, realizes the load balance of the two motors through one frequency converter, realizes the cooperative operation control of the two motors, and compared with the prior art, the cooperative control of the utility model does not depend on the mechanical coupling characteristic between the two motors, can still realize the cooperative operation control of the two motors when the two motors are independent and have no connection relation, and reduces the cost investment and maintenance workload of the frequency converter equipment. The utility model can be applied to the occasion that the power frequency motor and the variable frequency motor run independently and respectively drive the respective load equipment, and can also be applied to the occasion that the power frequency motor and the variable frequency motor which are coupled through a coupling and other connecting mechanisms cooperatively drive the same load equipment. Taking a double-drive mill transmission system as an example, the investment of one frequency converter can be saved.
Drawings
FIG. 1 is a schematic diagram of the circuit connection of the components of the present utility model.
Fig. 2 is a schematic diagram showing the circuit connection relationship of each component in embodiment 1 of the present utility model.
Fig. 3 is a schematic block diagram of the workflow of embodiment 1 of the present utility model.
In the figure: 1. a power grid bus; 2. Sampling a signal line; 3. A power frequency loop sampling device; 4. A reactor; 5. A load device; 6. A coupling; 7. A frequency converter; 8. A variable frequency motor; 9. A power frequency motor.
Detailed Description
The utility model will be further described with reference to the drawings and the specific examples.
According to fig. 1, the utility model relates to a circuit for driving double motors to cooperatively operate by adopting a frequency converter, which comprises a power frequency loop and a frequency conversion loop, wherein the power frequency loop comprises a power frequency loop sampling device VAS 3, a switch QFs and a power frequency motor Ms 9 which are sequentially connected with a power grid bus 1 in a circuit mode, the frequency conversion loop comprises a switch QF, a frequency converter VFD 7 and a frequency conversion motor M8 which are sequentially connected with the power grid bus 1 in a circuit mode, the power frequency motor Ms 9 and the frequency conversion motor M8 are respectively connected with respective load equipment 5 through respective couplers 6, the frequency converter VFD 7 is connected with a power frequency loop sampling device VAS 3 through a sampling signal wire 2 and is used for obtaining real-time operation data of the power frequency motor Ms 9, and the frequency converter VFD 7 adjusts the operation state of the frequency conversion motor M8 according to the real-time operation data of the power frequency motor Ms 9 obtained by sampling, so as to realize cooperative operation control of the two motors.
The power grid bus 1 can adopt two independent buses to respectively supply power frequency motor Ms 9 and frequency converter VFD 7, or can adopt the same power grid bus to simultaneously supply power frequency motor Ms 9 and frequency converter VFD 7.
The switch KM, the switch KMs, the switch QFs and the switch QF are respectively a breaker or a contactor.
According to fig. 1 and 2, the load devices 5 driven by the power frequency motor Ms 9 and the variable frequency motor M8 through the respective corresponding couplings 6 may be two independent load devices, or the two motors may be connected through a mechanical coupling mechanism including a coupling, a clutch, a gear box and a transmission belt to jointly drive the same load device. When the two motors jointly drive the same load equipment, in the starting process, the coupler, the clutch, the gear box and the transmission belt are in a separated state, the two motors are correspondingly in a separated state on the mechanical connection structure, and after the power frequency motor Ms finishes starting, the coupler, the clutch, the gear box and the transmission belt are in a mechanical coupling connection state and jointly drive the same load equipment.
The sampling signals of the power frequency loop sampling device 3 comprise voltage sampling signals and current sampling signals, and the sampling signals of the sampling signal line 2 are voltage and current sampling analog quantity signals or digital quantity signals containing power frequency loop voltage, current, power and frequency information.
The industrial frequency motor and the variable frequency motor adopt an alternating current asynchronous motor, an alternating current excitation synchronous motor or an alternating current permanent magnet synchronous motor, and the types of the two motors are not necessarily the same.
Example 1:
According to fig. 2, in this embodiment, the frequency converter is firstly soft-started to the power frequency rotation speed, then switched to the power frequency operation, then the two motors are cooperatively operated to control the circuit for driving the same load device together, the reactor 4 and the switch KMs for synchronous switching are sequentially arranged on the connecting circuit between the output of the frequency converter VFD 7 and the output of the power frequency motor Ms 9, the switch KM is arranged between the output of the frequency converter VFD 7 and the output of the frequency converter M8, the power frequency motor Ms 9 and the frequency converter M8 respectively drive the load device 5 to work through respective couplings 6, the couplings 6 in this embodiment are clutches, the couplings 6 are disconnected in the starting process, the two motors are respectively started, the couplings 6 are closed after the starting is completed, and the two motors jointly drive the same load device 5. The frequency converter VFD 8 is connected to the power frequency loop sampling device VAS 3 through the sampling signal line 2, and acquires real-time operation data of the power frequency motor Ms 9.
In the initial state, the switch QFs on the power frequency loop and the switch KM on the frequency conversion loop are in an open state, the switch QF for supplying power to the frequency converter VFD 7 and the switch KMs for soft starting the power frequency motor Ms 9 are closed, after the frequency converter VFD 7 drives the power frequency motor Ms 9 to the power frequency rotation speed, the frequency converter VFD 7 obtains the voltage phase of the power grid bus 1 through the sampling signal line 2 and the power frequency loop sampling device VAS 3, adjusts the output voltage phase to be consistent with the voltage phase of the power grid bus, then closes the switch QFs on the power frequency loop, blocks the output of the frequency converter, opens the switch KMs on the frequency conversion loop, opens the circuit where the reactor 4 is located, and the power frequency motor Ms 9 completes the starting. The switch KM is closed, and the variable frequency motor M8 can be driven to operate by the variable frequency device VFD 7. The two motors are connected with a common load after being connected through a coupler, a clutch, a gear box and a mechanical coupling and connecting mechanism of a transmission belt. The frequency converter VFD 7 obtains real-time operation data of the power frequency motor Ms 9 from the power frequency loop sampling device VAS 3 through the sampling signal line 2, and then the operation state of the frequency converter motor M8 is adjusted by adjusting the amplitude and the frequency of the output voltage of the frequency converter VFD 8, so that the synchronous rotation speed and the cooperative control of power balance of the two motors are realized.
According to fig. 3, the operation flow from the start to the final driving of the load device in this embodiment is as follows:
Stage one: the switch QFs is opened, the switch KM is opened, the power supply switch QF of the frequency converter VFD is closed, the switch KMs is closed, the frequency converter VFD drives the power frequency motor Ms to be communicated in a loop, and the frequency converter VFD drives the power frequency motor Ms to reach the power frequency rotating speed.
Stage two: when the frequency converter VFD drives the power frequency motor Ms to reach the rated rotation speed, the frequency converter VFD obtains the voltage of the power grid bus through the power frequency loop sampling device VAS, and adjusts the amplitude of the output voltage to enable the frequency, the amplitude and the phase of the output voltage to be consistent with those of the power grid bus. Then switch QFs is closed, the output of the frequency converter is blocked, switch KMs is opened, the power frequency loop is communicated, and the power frequency motor Ms operates at power frequency.
Stage three: and closing the switch KM, and driving the variable frequency motor M to operate by the variable frequency motor VFD.
Stage four: the two motors are respectively connected with respective loads through respective couplings or connected with a common load through mechanical coupling connection mechanisms of the couplings, the clutches, the gear boxes and the transmission belts.
Stage five: the frequency converter VFD obtains real-time operation data signals of the power frequency motor Ms from the power frequency loop sampling device VAS through a sampling signal line, and adjusts the operation state of the frequency conversion motor M by adjusting the voltage and the frequency output by the frequency converter VFD, so that cooperative operation control of the two motors is realized.
The circuit for driving the double motors to cooperatively operate by adopting the frequency converter disclosed by the embodiment of the utility model is suitable for a transmission system of the two motors, such as an application occasion of a double-drive mill, and the starting and the cooperative operation control of the two motors can be realized by only one frequency converter, so that the input cost and the maintenance workload of frequency converter equipment are reduced.
While the utility model has been described in detail in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the utility model is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications, variations, and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the utility model is defined by the appended claims.
Claims (7)
1. A circuit for driving double motors to cooperatively operate by adopting a frequency converter is characterized in that: the circuit include power frequency return circuit and frequency conversion return circuit, the power frequency return circuit include with the power frequency return circuit sampling device VAS, switch QFs and a power frequency motor Ms that the electric wire netting busbar circuit connection in proper order, the frequency conversion return circuit include with the electric wire netting busbar circuit connection in proper order switch QF, a converter VFD and a frequency conversion motor M, through power frequency motor Ms and frequency conversion motor M drive the load equipment operation work, converter VFD connect the power frequency return circuit sampling device VAS that is used for obtaining the real-time operation data of power frequency motor Ms through the sampling signal line to according to the sampling signal that obtains, adjust frequency conversion motor M running state through the regulation of output voltage amplitude and frequency, realize the collaborative operation control to two motors.
2. A circuit for operating a dual motor in tandem with a single inverter as claimed in claim 1, wherein: the output end of the converter VFD is provided with two paths, one path is sequentially provided with a reactor and a switch KMs for synchronous switching, the circuit is connected to the power frequency motor Ms, the other path is connected to the variable frequency motor M after the switch KM is arranged, and the switch KM and the switch KMs respectively adopt a circuit breaker or a contactor.
3. A circuit for operating a dual motor in tandem with a single inverter as claimed in claim 1, wherein: the sampling signals of the power frequency loop sampling device comprise voltage sampling signals and current sampling signals, and the sampling signals of the sampling signal line are voltage and current sampling analog quantity signals or digital quantity signals containing power frequency loop voltage, current, power and frequency information.
4. A circuit for operating a dual motor in tandem using a frequency converter according to claim 1 or 2, wherein: the power frequency motor Ms and the variable frequency motor M respectively drive respective load devices through respective corresponding couplings, or the two motors are connected through a mechanical coupling connection mechanism comprising a coupling, a clutch, a gear box and a transmission belt and then jointly drive the same load device, in the starting process, the coupling, the clutch, the gear box and the transmission belt are in a separated state, the two motors are correspondingly in a separated state on the mechanical connection mechanism, and after the power frequency motor Ms is started, the coupling, the clutch, the gear box and the transmission belt are in a mechanical coupling connection state and jointly drive the same load device.
5. A circuit for operating a dual motor in tandem with a single inverter as claimed in claim 1, wherein: the switch QFs and the switch QF are respectively a breaker or a contactor.
6. A circuit for operating a dual motor in tandem using a frequency converter according to claim 1 or 2, wherein: the power frequency motor and the variable frequency motor are one or two selected from the alternating current asynchronous motor, the alternating current excitation synchronous motor and the alternating current permanent magnet synchronous motor.
7. A circuit for operating a dual motor in tandem with a single inverter as claimed in claim 1, wherein: the power grid bus for supplying power to the power frequency motor Ms and the frequency converter VFD is the same power grid bus or two different power grid buses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322487265.6U CN220915180U (en) | 2023-09-13 | 2023-09-13 | Circuit for driving double motors to cooperatively operate by adopting frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322487265.6U CN220915180U (en) | 2023-09-13 | 2023-09-13 | Circuit for driving double motors to cooperatively operate by adopting frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN220915180U true CN220915180U (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322487265.6U Active CN220915180U (en) | 2023-09-13 | 2023-09-13 | Circuit for driving double motors to cooperatively operate by adopting frequency converter |
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| Country | Link |
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| CN (1) | CN220915180U (en) |
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2023
- 2023-09-13 CN CN202322487265.6U patent/CN220915180U/en active Active
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