CN218940980U - Three-phase motor control circuit - Google Patents
Three-phase motor control circuit Download PDFInfo
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- CN218940980U CN218940980U CN202222888290.0U CN202222888290U CN218940980U CN 218940980 U CN218940980 U CN 218940980U CN 202222888290 U CN202222888290 U CN 202222888290U CN 218940980 U CN218940980 U CN 218940980U
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Abstract
The utility model discloses a three-phase motor control circuit, which relates to the field of motors, and comprises: the three-phase power supply module is used for supplying three-phase alternating current; the step-down rectifying and filtering module is used for converting three-phase alternating current into direct current; the switch module is used for controlling whether the circuit is conducted or not; the positive and negative rotation control module is used for controlling the positive and negative rotation of the motor; the safety protection module is used for disconnecting the circuit when the motor rotates forwards and backwards abnormally; the motor working module is used for working and rotating the motor; compared with the prior art, the utility model has the beneficial effects that: the utility model controls the switch through the relay of the forward and reverse rotation control module to further change the forward and reverse rotation of the motor, controls the voltage output to the motor through controlling the conduction frequency of the silicon controlled rectifier, and prevents the abnormal forward and reverse rotation of the motor through the safety protection module.
Description
Technical Field
The utility model relates to the field of motors, in particular to a three-phase motor control circuit.
Background
A three-phase motor is an ac motor driven by three-phase ac power. The three-phase motor is characterized in that when three-phase stator windings (each phase difference is 120 degrees in electrical angle) of the motor are electrified, a rotating magnetic field is generated, and the rotating magnetic field cuts the rotor windings to generate electricity.
The existing three-phase motor works through the frequency converter, however, the frequency converter has higher price, and a considerable part of users only use the speed regulation and direction adjustment functions, if the three-phase motor can have a low-price control circuit, the basic functions of speed regulation, direction adjustment and the like of the motor can be met, and the motor control cost can be effectively saved.
Disclosure of Invention
The present utility model is directed to a three-phase motor control circuit for solving the problems set forth in the background art.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a three-phase motor control circuit comprising:
the three-phase power supply module is used for supplying three-phase alternating current;
the step-down rectifying and filtering module is used for converting three-phase alternating current into direct current;
the switch module is used for controlling whether the circuit is conducted or not;
the positive and negative rotation control module is used for controlling the positive and negative rotation of the motor;
the safety protection module is used for disconnecting the circuit when the motor rotates forwards and backwards abnormally;
the motor working module is used for working and rotating the motor;
the three-phase power supply module is connected with the step-down rectifying and filtering module and the motor working module, the step-down rectifying and filtering module is connected with the switch module, the switch module is connected with the forward and reverse rotation control module, the forward and reverse rotation control module is connected with the safety protection module and the motor working module, and the safety protection module is connected with the motor working module.
As still further aspects of the utility model: the switch module comprises a resistor R1, a capacitor C3, a switch S4, an interface A, an interface B and an interface C, wherein one end of the resistor R1 is connected with the buck rectifying and filtering module, the other end of the resistor R1 is connected with one end of the capacitor C3 and one end of the switch S4, the other end of the capacitor C3 is grounded, and the other end of the switch S4 is connected with the interface A/B/C.
As still further aspects of the utility model: the positive and negative rotation control module comprises a relay J2, a diode D2, a relay J3 and a diode D3, wherein one end of the relay J2 is connected with the negative electrode of the diode D2, an interface A and a safety protection module, the other end of the relay J2 is grounded, the positive electrode of the diode D2 is grounded, one end of the relay J3 is connected with the negative electrode of the diode D3, an interface C and the safety protection module, the other end of the relay J3 is grounded, and the positive electrode of the diode D3 is grounded.
As still further aspects of the utility model: the safety protection module comprises a mutual inductor LX1, a diode D6, a capacitor C4, a MOS tube V1, a relay J1, a diode D1, a mutual inductor LX2, a diode D7, a capacitor C5, a MOS tube V2, a relay J5, a diode D5, a silicon controlled rectifier Z5 and a silicon controlled rectifier Z4, wherein one end of the mutual inductor LX1 is grounded, the other end of the mutual inductor LX1 is connected with the positive electrode of the diode D6, the negative electrode of the diode D6 is connected with one end of the capacitor C4, the S electrode of the MOS tube V1 is grounded, the other end of the capacitor C4 is grounded, the G electrode of the MOS tube V1 is connected with a positive inversion control module, the D electrode of the MOS tube V1 is connected with the third end of the silicon controlled rectifier Z4, the first end of the silicon controlled rectifier Z4 is connected with a switch module, the second end of the silicon controlled rectifier Z4 is connected with one end of the relay J1, the other end of the relay J1 is grounded, one end of the mutual inductor LX2 is grounded, one end of the other end of the mutual inductor L2 is connected with the positive electrode of the diode D7, the other end of the MOS tube is connected with the positive electrode of the MOS tube 5, and the other end of the MOS tube is connected with the second end of the silicon controlled rectifier V5, the other end of the MOS tube is connected with the positive electrode 5 is connected with the second end of the silicon controlled rectifier 5, and the other end of the MOS tube is connected with the negative electrode of the silicon controlled rectifier 5 is connected with the positive electrode 5.
As still further aspects of the utility model: the motor operation module comprises a silicon controlled rectifier Z1, a silicon controlled rectifier Z2, a silicon controlled rectifier Z3, a motor M, a switch S11, a switch S12, a switch S13, a switch S21, a switch S22, a switch S23, a switch S31, a switch S32, a switch S33, a switch S51, a switch S52 and a switch S53, wherein the first end of the silicon controlled rectifier Z1 is connected with the first end of the output end of the three-phase power supply module, the first end of the silicon controlled rectifier Z2 is connected with the second end of the output end of the three-phase power supply module, the first end of the silicon controlled rectifier Z3 is connected with the third end of the output end of the three-phase power supply module, the second end of the silicon controlled rectifier Z1 is connected with one end of the switch S51, the second end of the silicon controlled rectifier Z2 is connected with one end of the switch S52, the second end of the silicon controlled rectifier Z3 is connected with one end of the switch S53, the other end of the switch S51 is connected with one end of the switch S21 through the switch S11, one end of the switch S31 is connected with one end of the switch S22, the other end of the switch S52 is connected with one end of the switch S32, the other end of the switch S53 is connected with one end of the other end of the switch S22 through the switch S13, the other end of the switch S33 is connected with the other end of the switch S33 is connected with the other end of the motor M, and the other end of the switch is connected with the other end of the motor M31.
Compared with the prior art, the utility model has the beneficial effects that: the utility model controls the switch through the relay of the forward and reverse rotation control module to further change the forward and reverse rotation of the motor, controls the voltage output to the motor through controlling the conduction frequency of the silicon controlled rectifier, and prevents the abnormal forward and reverse rotation of the motor through the safety protection module.
Drawings
Fig. 1 is a schematic diagram of a three-phase motor control circuit.
Fig. 2 is a circuit diagram of a three-phase motor control circuit.
Fig. 3 is a circuit diagram of a rectifier.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 1, a three-phase motor control circuit includes:
the three-phase power supply module is used for supplying three-phase alternating current;
the step-down rectifying and filtering module is used for converting three-phase alternating current into direct current;
the switch module is used for controlling whether the circuit is conducted or not;
the positive and negative rotation control module is used for controlling the positive and negative rotation of the motor;
the safety protection module is used for disconnecting the circuit when the motor rotates forwards and backwards abnormally;
the motor working module is used for working and rotating the motor;
the three-phase power supply module is connected with the step-down rectifying and filtering module and the motor working module, the step-down rectifying and filtering module is connected with the switch module, the switch module is connected with the forward and reverse rotation control module, the forward and reverse rotation control module is connected with the safety protection module and the motor working module, and the safety protection module is connected with the motor working module.
In particular embodiments: referring to fig. 2 and 3, the three-phase power module supplies three-phase voltages by introducing three live wires L1, L2, L3, the step-down rectifying and filtering module steps down by a transformer W, a rectifier T converts alternating current into direct current, the rectifier T is formed by a bridge rectifying circuit, and as shown in fig. 3, a filtering circuit formed by a capacitor C1, a capacitor C2, an inductor L1, and a resistor R1 performs filtering processing on the generated direct current waveform.
In this embodiment: referring to fig. 2, the switch module includes a resistor R1, a capacitor C3, a switch S4, an interface a, an interface B, and an interface C, wherein one end of the resistor R1 is connected to the buck rectifying filter module, the other end of the resistor R1 is connected to one end of the capacitor C3 and one end of the switch S4, the other end of the capacitor C3 is grounded, and the other end of the switch S4 is connected to the interface a/B/C.
The resistor R1 is used for limiting current, preventing the circuit current from being overlarge, the interface B is suspended, the switch S4 is connected to the interface B at the beginning, the motor M does not work, the motor rotates when being connected to the interface A, and the motor rotates in the opposite direction when being connected to the interface B.
In this embodiment: referring to fig. 2, the forward and reverse rotation control module includes a relay J2, a diode D2, a relay J3, and a diode D3, wherein one end of the relay J2 is connected to the cathode of the diode D2, the interface a, and the safety protection module, the other end of the relay J2 is grounded, the anode of the diode D2 is grounded, one end of the relay J3 is connected to the cathode of the diode D3, the interface C, and the safety protection module, the other end of the relay J3 is grounded, and the anode of the diode D3 is grounded.
When the switch S4 is connected to the interface A, the relay J2 works, the switches S21, S22 and S23 are controlled to be closed, and the motor M works in a power-on mode; when the switch S4 is connected to the interface C, the relay J3 works, the switches S31, S32 and S33 are controlled to be closed, the motor M is electrified, and at the moment, the input three-phase voltage is different from the three-phase voltage input by the switches S21, S22 and S23 in phase sequence, so that the motor M rotates in the opposite direction.
In this embodiment: referring to fig. 2, the safety protection module includes a transformer LX1, a diode D6, a capacitor C4, a MOS transistor V1, a relay J1, a diode D1, a transformer LX2, a diode D7, a capacitor C5, a MOS transistor V2, a relay J5, a diode D5, a thyristor Z5, and a thyristor Z4, wherein one end of the transformer LX1 is grounded, the other end of the transformer LX1 is connected to the positive electrode of the diode D6, the negative electrode of the diode D6 is connected to one end of the capacitor C4, the S electrode of the MOS transistor V1 is grounded, the other end of the capacitor C4 is connected to the ground, the G electrode of the MOS transistor V1 is connected to the positive electrode control module, the D electrode of the MOS transistor V1 is connected to the third end of the thyristor Z4, the first end of the thyristor Z4 is connected to the switch module, the second end of the thyristor Z4 is connected to one end of the relay J1, the other end of the diode D1 is grounded, the positive electrode of the other end of the transformer LX2 is connected to the positive electrode of the diode D5, and the other end of the thyristor is connected to the positive electrode of the thyristor 5 is connected to the second end of the diode 5.
When the switch S4 is turned from the interface a to the interface C, the relay J2 is powered off under normal conditions, and when the relay J2 fails and the switches S21, S22 and S23 cannot be controlled, the relay J2 is powered off, and when the relay J3 works, all of the switches S21, S22, S23, S31, S32 and S33 are closed, and three-phase voltages input to the motor M are disordered, so that the motor M works abnormally;
therefore, a safety protection module is arranged, when the switch S4 is connected with the interface C through the interface A, under normal conditions, the voltage VCC2 is 0, the switches S21, S22 and S23 are disconnected, when the voltage VCC2 is 0 in abnormal conditions, the switches S21, S22 and S23 are closed, at the moment, the mutual inductor LX2 detects voltage power supply, the PMOS tube V2 is conducted, the driving relay J5 works, the switches S51, S52 and S53 are controlled to be disconnected, and the power supply is stopped, so that the situation that a motor M is avoided; similarly, when the relay J3 fails, the relay J1 operates to open the switches S11, S12, S13 as when the relay J2 fails.
In this embodiment: referring to fig. 2, the motor operating module includes a thyristor Z1, a thyristor Z2, a thyristor Z3, a motor M, a switch S11, a switch S12, a switch S13, a switch S21, a switch S22, a switch S23, a switch S31, a switch S32, a switch S33, a switch S51, a switch S52, and a switch S53, wherein a first end of the thyristor Z1 is connected to a first end of an output terminal of the three-phase power supply module, a first end of the thyristor Z2 is connected to a second end of the three-phase power supply module, a first end of the thyristor Z3 is connected to a third end of the output terminal of the three-phase power supply module, a second end of the thyristor Z1 is connected to one end of the switch S51, a second end of the thyristor Z2 is connected to one end of the switch S52, a second end of the switch S31 is connected to one end of the switch S53, another end of the switch S51 is connected to one end of the switch S21 through the switch S11, one end of the switch S31 is connected to one end of the other end of the switch S52, another end of the switch S32 is connected to one end of the other end of the switch S12, another end of the switch S53 is connected to one end of the other end of the switch S22 through the switch S23, another end of the switch S33 is connected to another end of the other end of the motor M33, and another end of the other end of the switch is connected to the other end of the motor M33 is connected to the other end of the switch S33.
When the circuit is electrified, the switch S4 is connected to the interface B, the live wires L1, L2 and L3 pass through the thyristors Z1, Z2 and Z3, pass through the closed switches S51, S52 and S53, pass through the closed switches S11, S12 and S13 and pass through the opened switches S21, S22 and S23 (or S31, S32 and S33) to reach the motor M; when the switch S4 is connected to the interface A, the switches S21, S22 and S23 are closed, and the motor M is powered on to work; when the switch S4 is connected to the interface C, the switches S31, S32 and S33 are closed, and the motor M is powered to work reversely; when the corresponding switch cannot be controlled due to abnormality of the relay J2 and the relay J3, the switches S51, S52 and S53 or the switches S11, S12 and S13 are disconnected to protect the motor M, and in addition, the voltage output to the motor M through three firing wires is controlled by controlling the unit conduction time of the thyristors Z1, Z2 and Z3, so that the rotating speed of the motor M is changed.
The working principle of the utility model is as follows: the three-phase power module supplies three-phase alternating current, the step-down rectifying and filtering module converts the three-phase alternating current into direct current, the switching module controls whether the circuit is conducted or not, the forward and reverse rotation control module controls the motor to forward and reverse rotation, the safety protection module cuts off the circuit when the forward and reverse rotation of the motor is abnormal, and the motor working module works and rotates.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A three-phase motor control circuit, characterized in that:
the three-phase motor control circuit includes:
the three-phase power supply module is used for supplying three-phase alternating current;
the step-down rectifying and filtering module is used for converting three-phase alternating current into direct current;
the switch module is used for controlling whether the circuit is conducted or not;
the positive and negative rotation control module is used for controlling the positive and negative rotation of the motor;
the safety protection module is used for disconnecting the circuit when the motor rotates forwards and backwards abnormally;
the motor working module is used for working and rotating the motor;
the three-phase power supply module is connected with the step-down rectifying and filtering module and the motor working module, the step-down rectifying and filtering module is connected with the switch module, the switch module is connected with the forward and reverse rotation control module, the forward and reverse rotation control module is connected with the safety protection module and the motor working module, and the safety protection module is connected with the motor working module.
2. The three-phase motor control circuit according to claim 1, wherein the switch module comprises a resistor R1, a capacitor C3, a switch S4, an interface a, an interface B, and an interface C, one end of the resistor R1 is connected to the buck rectifying filter module, the other end of the resistor R1 is connected to one end of the capacitor C3 and one end of the switch S4, the other end of the capacitor C3 is grounded, and the other end of the switch S4 is connected to the interface a/B/C.
3. The three-phase motor control circuit according to claim 2, wherein the forward and reverse rotation control module comprises a relay J2, a diode D2, a relay J3, and a diode D3, one end of the relay J2 is connected to the negative electrode of the diode D2, the interface a, and the safety protection module, the other end of the relay J2 is grounded, the positive electrode of the diode D2 is grounded, one end of the relay J3 is connected to the negative electrode of the diode D3, the interface C, and the safety protection module, the other end of the relay J3 is grounded, and the positive electrode of the diode D3 is grounded.
4. The three-phase motor control circuit according to claim 1, wherein the safety protection module comprises a mutual inductor LX1, a diode D6, a capacitor C4, a MOS transistor V1, a relay J1, a diode D1, a mutual inductor LX2, a diode D7, a capacitor C5, a MOS transistor V2, a relay J5, a diode D5, a thyristor Z4, one end of the mutual inductor LX1 is grounded, the other end of the mutual inductor LX1 is connected to the positive electrode of the diode D6, the negative electrode of the diode D6 is connected to one end of the capacitor C4, the other end of the capacitor C4 is grounded, the G electrode of the MOS transistor V1 is connected to the positive and negative control module, the D electrode of the MOS transistor V1 is connected to the third end of the thyristor Z4, the first end of the thyristor Z4 is connected to the switch module, the second end of the thyristor Z4 is connected to one end of the diode D1, the other end of the thyristor J1 is grounded, the positive electrode of the diode D2 is grounded, the other end of the thyristor is connected to the positive electrode of the diode 5 is connected to the other end of the diode 5, and the other end of the diode is connected to the positive electrode of the diode 5 is connected to the other end of the diode 5.
5. The three-phase motor control circuit according to claim 1, wherein the motor operation module comprises a thyristor Z1, a thyristor Z2, a thyristor Z3, a motor M, a switch S11, a switch S12, a switch S13, a switch S21, a switch S22, a switch S23, a switch S31, a switch S32, a switch S33, a switch S51, a switch S52, a switch S53, a first end of the thyristor Z1 is connected to a first end of an output terminal of the three-phase power supply module, a first end of the thyristor Z2 is connected to a second end of the output terminal of the three-phase power supply module, a first end of the thyristor Z3 is connected to a third end of the output terminal of the three-phase power supply module, a second end of the thyristor Z1 is connected to one end of the switch S51, a second end of the thyristor Z2 is connected to one end of the switch S52, another end of the switch S51 is connected to one end of the switch S21 through the switch S11, one end of the switch S31, another end of the switch S52 is connected to one end of the switch S22 through the switch S12, another end of the switch S32 is connected to another end of the switch S33, another end of the switch S23 is connected to another end of the motor S33, another end of the switch S33 is connected to another end of the other end of the switch S33, and another end of the motor is connected to another end of the switch S33.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222888290.0U CN218940980U (en) | 2022-10-31 | 2022-10-31 | Three-phase motor control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222888290.0U CN218940980U (en) | 2022-10-31 | 2022-10-31 | Three-phase motor control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218940980U true CN218940980U (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222888290.0U Active CN218940980U (en) | 2022-10-31 | 2022-10-31 | Three-phase motor control circuit |
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| CN (1) | CN218940980U (en) |
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- 2022-10-31 CN CN202222888290.0U patent/CN218940980U/en active Active
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