CN219394722U - Variable-frequency soft start circuit of alternating-current motor - Google Patents
Variable-frequency soft start circuit of alternating-current motor Download PDFInfo
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- CN219394722U CN219394722U CN202223489244.XU CN202223489244U CN219394722U CN 219394722 U CN219394722 U CN 219394722U CN 202223489244 U CN202223489244 U CN 202223489244U CN 219394722 U CN219394722 U CN 219394722U
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Abstract
The utility model discloses a variable frequency soft start circuit of an alternating current motor, which relates to the technical field of variable frequency start of the alternating current motor, and comprises the following components: the power supply end of the frequency conversion starting circuit is used for inputting a three-phase power supply, the first output end of the frequency conversion starting circuit is connected with the first input end of the first switching device, the second output end of the frequency conversion starting circuit is connected with the first input end of the second switching device, and the third output end of the frequency conversion starting circuit is connected with the first input end of the third switching device; the second input end of the first switching device, the second input end of the second switching device and the second input end of the third switching device are used for inputting a three-phase power supply, and the output end of the first switching device, the output end of the second switching device and the output end of the third switching device are used for being connected with an external alternating current motor; the circuit improves the overall working efficiency of the alternating current motor.
Description
Technical Field
The utility model relates to the technical field of variable frequency starting of alternating current motors, in particular to a variable frequency soft starting circuit of an alternating current motor.
Background
The alternating current motor is used as a power output device of electromechanical equipment and is widely applied to various industries, the alternating current motor is generally directly driven by a power grid, and when the alternating current motor is started, larger impact current is generated, and the impact current often causes damage to the motor; in order to solve the above problems, conventionally, an ac motor is soft-started by using a frequency converter, which can reduce the impact current when the ac motor is started, but after the ac motor is started, the frequency converter is always involved in the operation, and additional electric energy loss is brought, so that the overall working efficiency of the ac motor is lower.
Disclosure of Invention
Based on this, it is necessary to provide a variable frequency soft start circuit of an ac motor to solve the problem that the existing ac motor start circuit brings extra power loss, resulting in lower overall working efficiency of the ac motor.
Based on the technical problems, an embodiment of the present utility model provides an ac motor variable frequency soft start circuit, including:
the frequency conversion starting circuit, the first switching device, the second switching device and the third switching device;
the power supply end of the frequency conversion starting circuit is used for inputting a three-phase power supply, the first output end of the frequency conversion starting circuit is connected with the first input end of the first switching device, the second output end of the frequency conversion starting circuit is connected with the first input end of the second switching device, and the third output end of the frequency conversion starting circuit is connected with the first input end of the third switching device;
the second input end of the first switching device, the second input end of the second switching device and the second input end of the third switching device are used for inputting a three-phase power supply, the output end of the first switching device, the output end of the second switching device and the output end of the third switching device are respectively used for being connected with an external alternating current motor, and the first switching device, the second switching device and the third switching device are used for switching the power supply into the three-phase power supply after the external alternating current motor is started through the variable frequency starting circuit.
The scheme has the following beneficial effects:
according to the variable-frequency soft-start circuit of the alternating-current motor, the switching device is arranged on the bypass of the variable-frequency starting circuit, when the alternating-current motor is started, the switching device switches the power supply of the alternating-current motor into the power supply output by the variable-frequency starting circuit, and when the alternating-current motor is started, the switching device switches the power supply of the alternating-current motor into the power supply of the power grid, so that the variable-frequency starting circuit does not consume electric energy additionally, and the overall working efficiency of the alternating-current motor is improved.
Optionally, the frequency conversion starting circuit includes:
the input end of the rectifying circuit is used for inputting a three-phase power supply, the output end of the rectifying circuit is connected with the input end of the variable frequency starting branch, the first output end of the variable frequency starting branch is connected with the first input end of the first switching device, the second output end of the variable frequency starting branch is connected with the first input end of the second switching device, and the third output end of the variable frequency starting branch is connected with the first input end of the third switching device.
Optionally, the rectifying circuit includes:
a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode;
the anodes of the first diodes are respectively connected with the anodes of the second diodes and the anodes of the third diodes, the cathodes of the fourth diodes are respectively connected with the cathodes of the fifth diodes and the cathodes of the sixth diodes, the cathodes of the first diodes are respectively connected with the anodes of the fourth diodes and the first phase power supply of the three-phase power supply, the cathodes of the second diodes are respectively connected with the anodes of the fifth diodes and the second phase power supply of the three-phase power supply, and the cathodes of the third diodes are respectively connected with the anodes of the sixth diodes and the third phase power supply of the three-phase power supply.
Optionally, the variable frequency starting branch circuit includes:
the input end of the first frequency conversion starting branch is connected with the positive electrode of the rectifying circuit, the grounding end of the first frequency conversion starting branch is grounded, and the output end of the first frequency conversion starting branch is connected with the first input end of the first switching device;
the input end of the second frequency conversion starting branch is connected with the positive electrode of the rectifying circuit, the grounding end of the second frequency conversion starting branch is grounded, and the output end of the second frequency conversion starting branch is connected with the first input end of the second switching device;
the input end of the third frequency conversion starting branch is connected with the positive electrode of the rectifying circuit, the grounding end of the third frequency conversion starting branch is grounded, and the output end of the third frequency conversion starting branch is connected with the first input end of the third switching device.
Optionally, the first frequency conversion starting branch includes:
the input end of the first switching tube is connected with the positive electrode of the rectifying circuit, the output end of the first switching tube is respectively connected with the input end of the second switching tube and the first input end of the first switching device, the output end of the second switching tube is grounded, and the control ends of the first switching tube and the second switching tube are respectively used for inputting control signals.
Optionally, the second frequency conversion starting branch includes:
the input end of the third switching tube is connected with the positive electrode of the rectifying circuit, the output end of the third switching tube is respectively connected with the input end of the fourth switching tube and the first input end of the second switching device, the output end of the fourth switching tube is grounded, and the control ends of the third switching tube and the fourth switching tube are respectively used for inputting control signals.
Optionally, the third frequency conversion starting branch includes:
the input end of the fifth switching tube is connected with the positive electrode of the rectifying circuit, the output end of the fifth switching tube is respectively connected with the input end of the sixth switching tube and the first input end of the third switching device, the output end of the sixth switching tube is grounded, and the control ends of the fifth switching tube and the sixth switching tube are respectively used for inputting control signals.
Optionally, the frequency conversion starting circuit further includes:
the positive electrode of the first capacitor is connected with the positive electrode of the rectifying circuit, the negative electrode of the first capacitor is grounded, and the second capacitor is connected with the first capacitor in parallel.
Optionally, the first capacitor is a capacitor with polarity, and the second capacitor is a capacitor without polarity.
Optionally, the first switching device, the second switching device and the third switching device are all relays.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a first ac motor variable frequency soft start circuit according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a second ac motor variable frequency soft start circuit according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a third ac motor variable frequency soft start circuit according to an embodiment of the present utility model;
the symbols are as follows:
1. a frequency conversion starting circuit; 11. a rectifying circuit; 12. a variable frequency starting branch circuit; 121. a first variable frequency starting branch; 122. a second variable frequency starting branch; 123. a third variable frequency starting branch; k1, a first switching device; k2, a second switching device; k3, a third switching device.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments.
It is to be understood that the embodiments set forth below represent the necessary information to enable those skilled in the art to practice the embodiments and illustrate the best mode of practicing the embodiments. Upon reading the following description in light of the accompanying drawing figures, those skilled in the art will understand the concepts of the disclosure and will recognize applications of these concepts not particularly addressed herein. It should be understood that these concepts and applications fall within the scope of the disclosure and the accompanying claims.
It will be further understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
It will be further understood that the terms "upper," "lower," "left," "right," "front," "rear," "bottom," "middle," "top," and the like may be used herein to describe various elements and that the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings merely to facilitate describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operate in a particular orientation, and that these elements should not be limited by these terms.
These terms are only used to distinguish one element from another element. For example, a first element could be termed a "upper" element, and, similarly, a second element could be termed a "upper" element, depending on the relative orientation of the elements, without departing from the scope of the present disclosure.
It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In one embodiment, there is provided an ac motor variable frequency soft start circuit as shown in fig. 1, the circuit comprising: a frequency conversion starting circuit 1, a first switching device K1, a second switching device K2 and a third switching device K3; the power supply ends P1, P2, and P3 of the frequency conversion starting circuit 1 are used for inputting a three-phase power supply U, V, W, the frequency conversion starting circuit 1 is provided with three output terminals, a first output end of the frequency conversion starting circuit 1 is connected with a first input end of the first switching device K1, a second output end of the frequency conversion starting circuit 1 is connected with a first input end of the second switching device K2, and a third output end of the frequency conversion starting circuit 1 is connected with a first input end of the third switching device K3.
The second input end of the first switching device K1, the second input end of the second switching device K2 and the second input end of the third switching device K3 are used for inputting a three-phase power source U, V, W, the output end P4 of the first switching device K1, the output end P5 of the second switching device K2 and the output end P6 of the third switching device K3 are respectively used for being connected with an external alternating current motor, and the first switching device K1, the second switching device K2 and the third switching device K3 are used for switching the power supply into the three-phase power source U, V, W after the external alternating current motor is started through the variable frequency starting circuit 1.
The working process of the variable-frequency soft-start circuit of the alternating-current motor is as follows:
when the alternating current motor is started, the first switching device K1, the second switching device K2 and the third switching device K3 switch the power supply of the alternating current motor into the power supply voltage output by the variable frequency starting circuit 1, namely, the alternating current motor is subjected to variable frequency soft start through the variable frequency starting circuit 1, after the alternating current motor stably operates, the first switching device K1, the second switching device K2 and the third switching device K3 switch the power supply of the alternating current motor into a power grid, the alternating current motor is directly driven to operate, and the variable frequency starting circuit 1 stops working.
According to the alternating current motor variable frequency soft start circuit, the switching device is arranged on the bypass of the variable frequency start circuit, when the alternating current motor is started, the switching device switches the power supply of the alternating current motor into the power supply output by the variable frequency start circuit, and when the alternating current motor is started, the switching device switches the power supply of the alternating current motor into the power supply of the power grid, so that the variable frequency start circuit does not consume electric energy additionally, and the overall working efficiency of the alternating current motor is improved.
In one embodiment, there is provided an ac motor variable frequency soft start circuit as shown in fig. 2, which is different from the ac motor variable frequency soft start circuit in fig. 1 in that the variable frequency start circuit 1 includes: the input end of the rectifying circuit 11 is used for inputting a three-phase power supply U, V, W, the output end of the rectifying circuit 11 is connected with the input end of the variable-frequency starting branch 12, the first output end of the variable-frequency starting branch 12 is connected with the first input end of the first switching device K1, the second output end of the variable-frequency starting branch 12 is connected with the first input end of the second switching device K2, and the third output end of the variable-frequency starting branch 12 is connected with the first input end of the third switching device K3.
In the present embodiment, the rectifying circuit 11 includes: diode D1, diode D2, diode D3, diode D4, diode D5, and diode D6; the anode of the diode D2 is respectively connected with the anode of the diode D4 and the anode of the diode D6, the cathode of the diode D1 is respectively connected with the cathode of the diode D3 and the cathode of the diode D5, the cathode of the diode D2 is respectively connected with the anode of the diode D1 and the first phase power supply U of the three-phase power supply, the cathode of the diode D4 is respectively connected with the anode of the diode D3 and the second phase power supply V of the three-phase power supply, and the cathode of the diode D6 is respectively connected with the anode of the diode D5 and the third phase power supply W of the three-phase power supply; namely, the diodes D1, D2, D3, D4, D5 and D6 form a full-bridge rectifying circuit, the three-phase ac power is converted into dc power, the cathode connection terminals of the diodes D1, D3 and D5 serve as the positive electrode of the rectifying circuit 11, and the anode connection terminals of the diodes D2, D4 and D6 serve as the ground terminal, i.e., the negative electrode, of the rectifying circuit 11.
In this embodiment, the variable frequency starting branch 12 includes: the first frequency conversion starting branch 121, the second frequency conversion starting branch 122 and the third frequency conversion starting branch 123, wherein the input end of the first frequency conversion starting branch 121 is connected with the positive electrode of the rectifying circuit 11, the grounding ground of the first frequency conversion starting branch 121 is grounded, and the output end of the first frequency conversion starting branch 121 is connected with the first input end of the first switching device K1; the input end of the second frequency conversion starting branch 122 is connected with the positive electrode of the rectifying circuit 11, the grounding end of the second frequency conversion starting branch 122 is grounded, and the output end of the second frequency conversion starting branch 122 is connected with the first input end of the second switching device K2; the input end of the third frequency conversion starting branch 123 is connected with the positive electrode of the rectifying circuit 11, the grounding end of the third frequency conversion starting branch 123 is grounded, and the output end of the third frequency conversion starting branch 123 is connected with the first input end of the third switching device K3.
In this embodiment, the first frequency conversion start branch 121 includes: the switching tube Q1 and the switching tube Q2, wherein, the positive pole of rectifier circuit 11 is connected to switching tube Q1's input, and switching tube Q2's input and first switching device K1's first input are connected respectively to switching tube Q1's output, and switching tube Q2's output ground connection, and switching tube Q1 and switching tube Q2's control end are used for the input control signal respectively to control switching tube Q1 and switching tube Q2's break-make.
The second variable frequency start-up branch 122 comprises: the switching tube Q3 and the switching tube Q4, wherein, the positive pole of rectifier circuit 11 is connected to switching tube Q3's input, and switching tube Q4's input and the first input of second auto-change over device K2 are connected respectively to switching tube Q3's output, and switching tube Q4's output ground connection, switching tube Q3 and switching tube Q4's control end are used for the input control signal respectively to control switching tube Q3 and switching tube Q4's break-make.
The third variable frequency start-up branch 123 comprises: the switching tube Q5 and the switching tube Q6, wherein, the positive pole of rectifier circuit 11 is connected to switching tube Q5's input, and switching tube Q6's input and the first input of third auto-change over device K3 are connected respectively to switching tube Q5's output, and switching tube Q6's output ground connection, switching tube Q5 and switching tube Q6's control end are used for the input control signal respectively to control switching tube Q5 and switching tube Q6's break-make.
In this embodiment, the first switching device K1, the second switching device K2, and the third switching device K3 are all relays, and the switching of the power supply of the ac motor is realized by controlling the relays.
In this embodiment, the switching tube Q1, the switching tube Q2, the switching tube Q3, the switching tube Q4, the switching tube Q5 and the switching tube Q6 are all IGBT devices, and by controlling the turn-on frequency of the IGBT devices, the variable frequency starting of the ac motor is achieved.
The working process of the variable-frequency soft-start circuit of the alternating-current motor is as follows:
when the alternating current motor is started, the first switching device K1, the second switching device K2 and the third switching device K3 switch the power supply of the alternating current motor into the power supply voltage output by the variable frequency starting circuit 1, the rectifying circuit 11 in the variable frequency starting circuit 1 converts the three-phase alternating current power supply into direct current power supply, the direct current power supply is input into the variable frequency starting branch 12, the on-off of the switching tubes Q1-Q6 is controlled, the voltage and frequency synchronous regulation output is realized, namely, the alternating current motor is subjected to variable frequency soft start through the variable frequency starting circuit 1, after the alternating current motor stably operates, the first switching device K1, the second switching device K2 and the third switching device K3 switch the power supply of the alternating current motor into a power grid, the alternating current motor is directly driven to operate, and the variable frequency starting circuit 1 stops working.
The alternating current motor variable frequency soft start circuit of the embodiment has the following characteristics:
(1) When the alternating current motor is started, the switching device switches the power supply of the alternating current motor into the power grid for supplying power, so that the frequency conversion starting circuit does not consume electric energy additionally, and the overall working efficiency of the alternating current motor is improved.
(2) The frequency conversion starting circuit is built by adopting IGBT devices, and compared with a frequency converter directly used, the frequency conversion starting circuit has lower hardware cost.
In an embodiment, an ac motor variable frequency soft start circuit as shown in fig. 3 is provided, which is different from the ac motor variable frequency soft start circuit in fig. 1 in that the ac motor variable frequency soft start circuit further includes a capacitor E1 and a capacitor C1, where a positive electrode of the capacitor E1 is connected to a positive electrode of the rectifying circuit 11, a negative electrode of the capacitor E1 is grounded, and the capacitor C1 is connected in parallel to the capacitor E1.
In this embodiment, the capacitor E1 is a capacitor with polarity, and the capacitor C1 is a capacitor without polarity; the capacitor E1 and the capacitor C1 form a filter circuit, and can filter pulse signals at the output end of the rectifying circuit 11, so that the voltage output by the rectifying circuit is kept stable.
The working process and effect of the ac motor variable frequency soft start circuit of this embodiment are the same as those of the ac motor variable frequency soft start circuit of fig. 1.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. An ac motor variable frequency soft start circuit, comprising:
the frequency conversion starting circuit, the first switching device, the second switching device and the third switching device;
the power supply end of the frequency conversion starting circuit is used for inputting a three-phase power supply, the first output end of the frequency conversion starting circuit is connected with the first input end of the first switching device, the second output end of the frequency conversion starting circuit is connected with the first input end of the second switching device, and the third output end of the frequency conversion starting circuit is connected with the first input end of the third switching device;
the second input end of the first switching device, the second input end of the second switching device and the second input end of the third switching device are used for inputting a three-phase power supply, the output end of the first switching device, the output end of the second switching device and the output end of the third switching device are respectively used for being connected with an external alternating current motor, and the first switching device, the second switching device and the third switching device are used for switching the power supply into the three-phase power supply after the external alternating current motor is started through the variable frequency starting circuit.
2. The variable frequency soft start circuit of an ac motor of claim 1, wherein said variable frequency start circuit comprises:
the input end of the rectifying circuit is used for inputting a three-phase power supply, the output end of the rectifying circuit is connected with the input end of the variable frequency starting branch, the first output end of the variable frequency starting branch is connected with the first input end of the first switching device, the second output end of the variable frequency starting branch is connected with the first input end of the second switching device, and the third output end of the variable frequency starting branch is connected with the first input end of the third switching device.
3. The variable frequency soft start circuit of an ac motor of claim 2, wherein the rectifying circuit comprises:
a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode;
the anodes of the first diodes are respectively connected with the anodes of the second diodes and the anodes of the third diodes, the cathodes of the fourth diodes are respectively connected with the cathodes of the fifth diodes and the cathodes of the sixth diodes, the cathodes of the first diodes are respectively connected with the anodes of the fourth diodes and the first phase power supply of the three-phase power supply, the cathodes of the second diodes are respectively connected with the anodes of the fifth diodes and the second phase power supply of the three-phase power supply, and the cathodes of the third diodes are respectively connected with the anodes of the sixth diodes and the third phase power supply of the three-phase power supply.
4. The ac motor variable frequency soft start circuit of claim 2, wherein the variable frequency start branch comprises:
the input end of the first frequency conversion starting branch is connected with the positive electrode of the rectifying circuit, the grounding end of the first frequency conversion starting branch is grounded, and the output end of the first frequency conversion starting branch is connected with the first input end of the first switching device;
the input end of the second frequency conversion starting branch is connected with the positive electrode of the rectifying circuit, the grounding end of the second frequency conversion starting branch is grounded, and the output end of the second frequency conversion starting branch is connected with the first input end of the second switching device;
the input end of the third frequency conversion starting branch is connected with the positive electrode of the rectifying circuit, the grounding end of the third frequency conversion starting branch is grounded, and the output end of the third frequency conversion starting branch is connected with the first input end of the third switching device.
5. The ac motor variable frequency soft start circuit of claim 4, wherein the first variable frequency start branch comprises:
the input end of the first switching tube is connected with the positive electrode of the rectifying circuit, the output end of the first switching tube is respectively connected with the input end of the second switching tube and the first input end of the first switching device, the output end of the second switching tube is grounded, and the control ends of the first switching tube and the second switching tube are respectively used for inputting control signals.
6. The ac motor variable frequency soft start circuit of claim 4, wherein the second variable frequency start branch comprises:
the input end of the third switching tube is connected with the positive electrode of the rectifying circuit, the output end of the third switching tube is respectively connected with the input end of the fourth switching tube and the first input end of the second switching device, the output end of the fourth switching tube is grounded, and the control ends of the third switching tube and the fourth switching tube are respectively used for inputting control signals.
7. The ac motor variable frequency soft start circuit of claim 4, wherein the third variable frequency start branch comprises:
the input end of the fifth switching tube is connected with the positive electrode of the rectifying circuit, the output end of the fifth switching tube is respectively connected with the input end of the sixth switching tube and the first input end of the third switching device, the output end of the sixth switching tube is grounded, and the control ends of the fifth switching tube and the sixth switching tube are respectively used for inputting control signals.
8. The ac motor variable frequency soft start circuit of claim 2, further comprising:
the positive electrode of the first capacitor is connected with the positive electrode of the rectifying circuit, the negative electrode of the first capacitor is grounded, and the second capacitor is connected with the first capacitor in parallel.
9. The ac motor variable frequency soft start circuit of claim 8, wherein the first capacitor is a polar capacitor and the second capacitor is a non-polar capacitor.
10. The variable frequency soft start circuit of an ac motor of claim 1, wherein said first switching device, said second switching device and said third switching device are relays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223489244.XU CN219394722U (en) | 2022-12-21 | 2022-12-21 | Variable-frequency soft start circuit of alternating-current motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223489244.XU CN219394722U (en) | 2022-12-21 | 2022-12-21 | Variable-frequency soft start circuit of alternating-current motor |
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| CN219394722U true CN219394722U (en) | 2023-07-21 |
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| CN202223489244.XU Active CN219394722U (en) | 2022-12-21 | 2022-12-21 | Variable-frequency soft start circuit of alternating-current motor |
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