CN213879672U - Three-phase motor starting circuit, device and three-phase compressor - Google Patents
Three-phase motor starting circuit, device and three-phase compressor Download PDFInfo
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- CN213879672U CN213879672U CN202021637418.0U CN202021637418U CN213879672U CN 213879672 U CN213879672 U CN 213879672U CN 202021637418 U CN202021637418 U CN 202021637418U CN 213879672 U CN213879672 U CN 213879672U
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Abstract
The utility model provides a pair of three-phase motor starting circuit, device and three-phase compressor, the circuit includes: power module, control module, three-phase motor and auto transformer module, power module passes through control module and connects three-phase motor and auto transformer module respectively, wherein: the control module is used for conducting the power supply module and the autotransformer module and conducting the autotransformer module and the three-phase motor when receiving a starting instruction; and when the operation instruction is received, the power supply module is disconnected from the autotransformer module, the autotransformer module is disconnected from the three-phase motor, and the power supply module and the three-phase motor are connected. The starting current is reduced by accessing the autotransformer when the three-phase motor is started, and the autotransformer is separated from the three-phase motor after the starting is finished, so that the three-phase motor is directly accessed to a three-phase power supply, and the problem that the starting current greatly influences the service life of the three-phase motor is avoided on the basis of ensuring the normal operation of the three-phase motor.
Description
Technical Field
The utility model relates to a three-phase motor control field especially relates to a three-phase motor starting circuit, device and three-phase compressor.
Background
At present, the three-phase motor of the air conditioner is started in a star shape instantly, the starting current impact load is large, abnormal vibration can be caused in the starting process of the three-phase motor, and the reliability of an air conditioner external unit is reduced. Meanwhile, the impact of a large starting current on the three-phase motor is large, the service life of the three-phase motor can be shortened, and the risk of pipe cracking of an air conditioner external unit pipe is increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a three-phase motor starting circuit, device and three-phase compressor, aims at solving among the prior art three-phase motor starting current and flows big problem.
In order to achieve the above object, the utility model provides a three-phase motor starting circuit, the circuit includes: power module, control module, three-phase motor and autotransformer module, power module passes through control module connects respectively three-phase motor and autotransformer module, wherein:
the control module is used for conducting the power supply module and the autotransformer module and conducting the autotransformer module and the three-phase motor when a starting instruction is received; and when an operation instruction is received, the power supply module is disconnected from the autotransformer module, the autotransformer module is disconnected from the three-phase motor, and the power supply module is connected with the three-phase motor.
Optionally, the control module comprises a processor unit and a switch unit, an output end of the processor unit is connected with a control end of the switch unit, the power module is respectively connected with the three-phase motor and the autotransformer module through the switch unit,
the processor unit is used for sending a first closing instruction to the switch unit when receiving a starting instruction so as to enable the switch unit to conduct the power supply module and the autotransformer module; and sending a second closing instruction to the switch unit when receiving the operation instruction so as to enable the switch unit to disconnect the power module and the autotransformer module and connect the power module and the three-phase motor.
Optionally, the autotransformer module includes three autotransformers, an input terminal of each autotransformer is connected to one phase output of the power supply, a first tap of each autotransformer is connected to one phase input of the three-phase motor, and negative terminals of the three autotransformers are shorted.
Optionally, the switching unit includes three contact sets, each contact set being connected to a phase power input of the power module, one of the autotransformers of the autotransformer module, and a phase stator winding of the three-phase motor, respectively, each contact set including a first movable contact, a second movable contact, a first start contact, a second start contact, a first operating contact, and a second operating contact; the first movable contact is connected with the first starting contact when receiving a first closing instruction, and the second movable contact is connected with the second starting contact when receiving the first closing instruction; the first movable contact is connected with the first operating contact when receiving a second closing instruction, and the second movable contact is connected with the second operating contact when receiving a second closing instruction;
the first movable contact is connected with one-phase power input of the power module, the first starting contact is connected with the input end of the auto-transformer, the second movable contact is connected with one-phase stator winding of the three-phase motor, the second starting contact is connected with the first output end of the auto-transformer, and the first operating contact is connected with the second operating contact.
Optionally, the control module further includes an under-voltage release and a reset switch, a first end of a coil of the under-voltage release is connected to a first end of the reset switch, a second end of the coil of the under-voltage release and a second end of the reset switch are respectively connected to two first starting contacts,
the undervoltage release is used for keeping the first movable contact and the first operating contact connected and keeping the second movable contact and the second operating contact connected when the undervoltage release is electrified, and disconnecting the first movable contact and the first operating contact and disconnecting the second movable contact and the second operating contact when the undervoltage release is electrified.
Optionally, the control module further includes a thermal relay, a coil of the thermal relay is connected between the second operating contact and a phase stator winding of the three-phase motor, and a normally closed contact of the thermal relay is connected between the reset switch and the first operating contact.
Optionally, the control module includes an activation switch, and the first movable contact is connected to the power supply module through the activation switch.
Optionally, the circuit further comprises a first fuse connected between the power module and the control module.
Optionally, the circuit further comprises a second fuse connected between the three-phase motor and the control module.
In order to achieve the above object, the utility model also provides a three-phase motor starting drive, three-phase motor starting drive includes as above three-phase motor starting circuit.
In order to achieve the above object, the present invention further provides a three-phase compressor, which comprises the three-phase motor starting circuit as described above.
The utility model provides a pair of three-phase motor starting circuit, device and three-phase compressor, the circuit includes: power module, control module, three-phase motor and autotransformer module, power module passes through control module connects respectively three-phase motor and autotransformer module, wherein: the control module is used for conducting the power supply module and the autotransformer module and conducting the autotransformer module and the three-phase motor when a starting instruction is received; and when an operation instruction is received, the power supply module is disconnected from the autotransformer module, the autotransformer module is disconnected from the three-phase motor, and the power supply module is connected with the three-phase motor. The starting current is reduced by accessing the autotransformer when the three-phase motor is started, and the autotransformer is separated from the three-phase motor after the starting is finished, so that the three-phase motor is directly accessed to a three-phase power supply, and the problem that the starting current greatly influences the service life of the three-phase motor is avoided on the basis of ensuring the normal operation of the three-phase motor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of an embodiment of a three-phase motor starting circuit according to the present invention;
fig. 2 is a schematic diagram of the structure of the three-phase motor starting circuit of the present invention;
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
The reference numbers illustrate:
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a three-phase motor starting circuit, refer to fig. 1, fig. 1 is the utility model discloses the module schematic diagram of three-phase motor starting circuit embodiment, the circuit includes: power module 100, control module 200, three-phase motor 400 and autotransformer module 300, power module 100 passes through control module 200 connects respectively three-phase motor 400 and autotransformer module 300, wherein:
the control module 200 is configured to, when receiving a start instruction, turn on the power module 100 and the autotransformer module 300, and turn on the autotransformer module 300 and the three-phase motor 400; when receiving an operation instruction, the power module 100 is disconnected from the autotransformer module 300, the autotransformer module 300 is disconnected from the three-phase motor 400, and the power module 100 is connected to the three-phase motor 400.
The start instruction is sent by an external switch connected to the control module 200, and the operation instruction may be sent by a condition trigger device disposed in the processor unit 201, such as a time relay, where the time relay starts timing when receiving the start instruction, and sends the operation instruction when the time relay reaches a preset time. The power module 100 includes three-phase power input circuits L1, L2, L3.
This embodiment reduces the starting current through access autotransformer when the start-up, and breaks away from the autotransformer after the start-up is accomplished and makes three-phase motor 400 directly insert three-phase power, has avoided the great problem that influences three-phase motor 400's life of starting current on the basis of having guaranteed three-phase motor 400 normal operating.
Further, the control module 200 includes a processor unit 201 and a switch unit QS2, an output terminal of the processor unit 201 is connected to a control terminal of the switch unit QS2, the power module 100 is respectively connected to the three-phase motor 400 and the autotransformer module 300 through the switch unit QS2,
the processor unit 201 is configured to send a first close command to a switch unit QS2 when receiving a start command, so that the switch unit QS2 turns on the power module 100 and the autotransformer module 300; and sending a second closing command to a switch unit QS2 when receiving the operation command, so that the switch unit QS2 disconnects the power module 100 from the autotransformer module 300 and connects the power module 100 with the three-phase motor 400.
In this embodiment, the switch unit QS2 is a contact of an intermediate relay, and a coil of the intermediate relay is controlled by the processor unit 201.
Further, the autotransformer module 300 includes three autotransformers, an input terminal of each autotransformer is connected to a phase output of the power supply, a first tap of each autotransformer is connected to a phase input of the three-phase motor 400, and negative terminals of the three autotransformers are shorted.
The autotransformer is a special transformer with a group of coils shared by output and input, voltage boosting and voltage reduction are realized by different taps, the voltage of a part of taps less than that of the shared coils is reduced, and the voltage of a part of taps more than that of the shared coils is increased; if the transformation ratio of the autotransformer is K, the primary voltage is U1, the secondary voltage U2 is U1/K, and the secondary current I2 is also reduced in proportion. Because the current relationship I1 between the primary side and the secondary side of the autotransformer is I2/K, the primary side current is smaller than the current flowing through the stator winding of the three-phase motor 400 directly, that is, the starting current supplied to the three-phase motor 400 by the power module 100 is 1/K2 times that of the direct start. When the voltage is reduced by 1/K times, the torque of the three-phase motor 400 is also reduced by 1/K2 times. The secondary side of the autotransformer is provided with 3 groups of taps, the secondary voltage is 80%, 60% and 40% of the primary voltage respectively, and the taps can be selected according to the starting torque.
Further, the switch unit QS2 includes three contact sets, each contact set respectively connected to one phase power input of the power module 100, one autotransformer in the autotransformer module 300, and one phase stator winding of the three-phase motor 400, each contact set including a first movable contact, a second movable contact, a first start contact, a second start contact, a first operating contact, and a second operating contact; the first movable contact is connected with the first starting contact when receiving a first closing instruction, and the second movable contact is connected with the second starting contact when receiving the first closing instruction; the first movable contact is connected with the first operating contact when receiving a second closing instruction, and the second movable contact is connected with the second operating contact when receiving a second closing instruction;
the first movable contact is connected to a phase power input of the power module 100, the first start contact is connected to an input terminal of the auto-transformer, the second movable contact is connected to a phase stator winding of the three-phase motor 400, the second start contact is connected to a first output terminal of the auto-transformer, and the first operating contact is connected to the second operating contact.
Further, the control module 200 further includes an under-voltage release KV and a reset switch SB, a first end of a coil of the under-voltage release KV is connected to a first end of the reset switch SB, a second end of the coil of the under-voltage release KV and a second end of the reset switch SB are respectively connected to two first starting contacts,
the undervoltage release KV is used for keeping the first movable contact connected with the first operating contact and the second movable contact connected with the second operating contact during power-on, and disconnecting the first movable contact from the first operating contact and disconnecting the second movable contact from the second operating contact during power-off;
the under-voltage release KV is a relay which can make the mechanical switch electric appliance have time delay or have no time delay to be switched on or switched off when the terminal voltage of the relay or the release is reduced to a preset value.
Further, the control module 200 further includes a thermal relay FR2, a coil of the thermal relay FR2 is connected between the second operating contact and a phase stator winding of the three-phase motor 400, and a normally closed contact of the thermal relay FR2 is connected between the reset switch SB and the first operating contact.
The thermal relay FR2 is a protective electrical appliance for overload protection of a motor or other electrical equipment and an electrical circuit, generates heat by current flowing into a thermal element, deforms a bimetal with different expansion coefficients, and pushes a connecting rod to act when the deformation reaches a certain distance, so that a control circuit is disconnected, a contactor is powered off, a main circuit is disconnected, and overload protection of the motor is realized.
Further, the control module 200 includes an activation switch QS1, and the first movable contact is connected to the power module 100 through the activation switch QS 1.
Further, the circuit also includes a first fuse FU1, the first fuse FU1 being connected between the power module 100 and the control module 200.
Further, the circuit also includes a second fuse FU2, the second fuse FU2 being connected between the three-phase motor 400 and the control module 200.
The fuse is an electric appliance which fuses a melt by heat generated by itself to open a circuit when a current exceeds a predetermined value.
The following description is made in principle with reference to fig. 2:
before a starting instruction is sent, a starting switch QS1 is closed to enable the power supply module 100 to be connected into a circuit, the starting instruction is sent through an external switch, after the processor unit 201 receives the starting instruction, the processor unit 201 controls a switch unit QS2 to act, so that a first movable contact of a switch unit QS2 is connected with a first starting contact, a second movable contact of the switch unit QS2 is connected with a second starting contact, at the moment, electricity output by the power supply module 100 is reduced in voltage through an autotransformer and then is transmitted to the three-phase motor 400, and the three-phase motor 400 starts to be started; when the three-phase motor 400 is started, the processor unit 201 controls the switch unit QS2 to act, so that the first movable contact of the switch unit QS2 is connected with the first operation contact, the second movable contact is connected with the second operation contact, at the moment, electricity output by the power module 100 is directly connected with the three-phase motor 400, the three-phase motor 400 is in an operation state, a KV coil of the undervoltage tripper, a reset switch SB and a thermal relay FR2 are connected into a circuit, the KV coil of the undervoltage tripper enables the switch unit QS2 to be in the operation state through a linkage mechanism, at the moment, if the reset switch SB is pressed down and the KV is de-energized, the switch unit QS2 is restored to the initial state, and the power module 100 is disconnected from the three-phase motor 400; when the three-phase motor 400 is in an operating state, if the coil of the thermal relay FR2 detects that the temperature is too high, the normally closed contact of the thermal relay FR2 is controlled to be disconnected, so that the undervoltage release KV loses power, the switch unit QS2 returns to the initial state, and the power module 100 is disconnected from the three-phase motor 400.
The utility model provides a three-phase motor starting drive, this three-phase motor starting drive include as above three-phase motor starting drive circuit, no longer give consideration to here. It should be understood that, since the three-phase motor starting device of the present embodiment adopts the technical solution of the three-phase motor starting circuit, the three-phase motor starting device has all the beneficial effects of the three-phase motor starting circuit.
The utility model provides a three-phase compressor, this three-phase compressor include as above three-phase motor starting circuit, no longer describe here. It should be understood that, since the three-phase compressor of the present embodiment adopts the technical solution of the three-phase motor starting circuit, the three-phase compressor has all the beneficial effects of the three-phase motor starting circuit.
The above is only the optional embodiment of the present invention, and not therefore the scope of the present invention is limited, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. A three-phase motor starting circuit, the circuit comprising: power module, control module, three-phase motor and autotransformer module, power module passes through control module connects respectively three-phase motor and autotransformer module, wherein:
the control module is used for conducting the power supply module and the autotransformer module and conducting the autotransformer module and the three-phase motor when a starting instruction is received; and when an operation instruction is received, the power supply module is disconnected from the autotransformer module, the autotransformer module is disconnected from the three-phase motor, and the power supply module is connected with the three-phase motor.
2. The three-phase motor starting circuit according to claim 1, wherein the control module comprises a processor unit and a switch unit, an output terminal of the processor unit is connected with a control terminal of the switch unit, the power module is respectively connected with the three-phase motor and the autotransformer module through the switch unit,
the processor unit is used for sending a first closing instruction to the switch unit when receiving a starting instruction so as to enable the switch unit to conduct the power supply module and the autotransformer module; and sending a second closing instruction to the switch unit when receiving the operation instruction so as to enable the switch unit to disconnect the power module and the autotransformer module and connect the power module and the three-phase motor.
3. A three phase motor start circuit as claimed in claim 2 wherein said autotransformer module includes three autotransformers, each having an input connected to a respective one of the power supply phase outputs, each having a first tap connected to a respective one of the three phase motor phase inputs, and having a negative terminal shorted.
4. A three-phase motor starting circuit according to claim 3, wherein said switching unit comprises three contact sets, each contact set being connected to a respective one of said power supply module's one phase power input, one of said autotransformers and a respective one of said three phase motor's one phase stator windings, each contact set comprising a first movable contact, a second movable contact, a first start contact, a second start contact, a first run contact and a second run contact; the first movable contact is connected with the first starting contact when receiving a first closing instruction, and the second movable contact is connected with the second starting contact when receiving the first closing instruction; the first movable contact is connected with the first operating contact when receiving a second closing instruction, and the second movable contact is connected with the second operating contact when receiving a second closing instruction;
the first movable contact is connected with one-phase power input of the power module, the first starting contact is connected with the input end of the auto-transformer, the second movable contact is connected with one-phase stator winding of the three-phase motor, the second starting contact is connected with the first output end of the auto-transformer, and the first operating contact is connected with the second operating contact.
5. The three-phase motor starting circuit of claim 4, wherein the control module further comprises an undervoltage release and a reset switch, a first end of a coil of the undervoltage release is connected to a first end of the reset switch, a second end of the coil of the undervoltage release and a second end of the reset switch are respectively connected to two first starting contacts,
the undervoltage release is used for keeping the first movable contact and the first operating contact connected and keeping the second movable contact and the second operating contact connected when the undervoltage release is electrified, and disconnecting the first movable contact and the first operating contact and disconnecting the second movable contact and the second operating contact when the undervoltage release is electrified.
6. The three-phase motor starting circuit of claim 5, wherein the control module further comprises a thermal relay, a coil of the thermal relay being connected between the second operating contact and a phase stator winding of the three-phase motor, a normally closed contact of the thermal relay being connected between the reset switch and the first operating contact.
7. The three-phase motor starting circuit according to claim 4, wherein said control module includes a start switch, said first movable contact being connected to said power module through said start switch.
8. A three-phase motor starting circuit according to claim 1, further comprising a first fuse connected between said power supply module and said control module.
9. A three-phase motor starting device, characterized in that it comprises a three-phase motor starting circuit according to any one of claims 1 to 8.
10. A three-phase compressor, characterized in that it comprises a three-phase motor starting circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021637418.0U CN213879672U (en) | 2020-08-07 | 2020-08-07 | Three-phase motor starting circuit, device and three-phase compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021637418.0U CN213879672U (en) | 2020-08-07 | 2020-08-07 | Three-phase motor starting circuit, device and three-phase compressor |
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| Publication Number | Publication Date |
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| CN213879672U true CN213879672U (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021637418.0U Active CN213879672U (en) | 2020-08-07 | 2020-08-07 | Three-phase motor starting circuit, device and three-phase compressor |
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- 2020-08-07 CN CN202021637418.0U patent/CN213879672U/en active Active
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