CN218850486U - Circuit for multi-voltage grade conversion of three-phase asynchronous motor - Google Patents
Circuit for multi-voltage grade conversion of three-phase asynchronous motor Download PDFInfo
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- CN218850486U CN218850486U CN202223030838.4U CN202223030838U CN218850486U CN 218850486 U CN218850486 U CN 218850486U CN 202223030838 U CN202223030838 U CN 202223030838U CN 218850486 U CN218850486 U CN 218850486U
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- phase asynchronous
- asynchronous motor
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Abstract
The utility model discloses a circuit for multi-voltage grade conversion of a three-phase asynchronous motor, which belongs to the technical field of motor control and solves the problem that the traditional three-phase asynchronous motor only supports one voltage grade, the utility model comprises an A wiring end, a B wiring end and a C wiring end of the three-phase asynchronous motor, wherein a winding module and a first contactor are respectively connected in series between every two of the A wiring end, the B wiring end and the C wiring end; the winding module comprises a plurality of windings connected in series, a fourth contactor is also connected in series between adjacent windings, a third contactor is connected between the front ends of two adjacent windings, and a third contactor is also connected between the rear ends of two adjacent windings; and a second contactor is connected in parallel between the winding module and the first contactor, and the three second contactors are connected in a star shape. The utility model discloses a single three-phase asynchronous machine can convert different voltage levels and supply power, has made things convenient for the operation to use, has improved work efficiency.
Description
Technical Field
The utility model belongs to the technical field of motor control, concretely relates to a circuit for three-phase asynchronous machine multivoltage grade conversion.
Background
The winding of the three-phase asynchronous motor consists of two parts, namely a stator winding which is embedded in a stator core slot and connected with a power supply, and a rotor winding which forms a loop after being short-circuited. When three-phase symmetrical AC power supply is connected to stator windings, a rotating magnetic field is generated in the air gap between stator and rotor, which cuts stator and rotor windings to induce electromotive force in them, and the rotor electromotive force generates short-circuit current in the rotor windings in self-closed loop. The rotor current interacts with the rotating magnetic field in the air gap to generate electromagnetic torque, so that the rotor drags a load to rotate through a mechanical shaft, and the alternating current motor capable of converting electric energy into mechanical energy is realized.
The stator windings are respectively connected in series between three wiring ends of a traditional three-phase asynchronous motor, once the three wiring ends are manufactured, the electrical parameters (voltage, current and the like) of the stator windings cannot be changed, so that the voltage level of the three-phase asynchronous motor connected into a three-phase alternating current power supply cannot be changed after the three-phase asynchronous motor is manufactured, when the three-phase asynchronous motor needs other voltage levels to work, the three-phase asynchronous motor with the required voltage level needs to be manufactured, the product cost is increased, and the three-phase asynchronous motor is not convenient to use.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a circuit for three-phase asynchronous machine multivoltage grade conversion to solve traditional three-phase asynchronous machine and only support the problem of a voltage grade.
The technical scheme of the utility model is that: a circuit for multi-voltage grade conversion of a three-phase asynchronous motor comprises an A wiring end, a B wiring end and a C wiring end of the three-phase asynchronous motor, wherein a winding module and a first contactor are respectively connected in series between every two of the A wiring end, the B wiring end and the C wiring end; the winding module comprises a plurality of windings connected in series, a fourth contactor is also connected in series between adjacent windings, a third contactor is connected between the front ends of two adjacent windings, and a third contactor is also connected between the rear ends of two adjacent windings; and a second contactor is connected in parallel between the winding module and the first contactor, and the three second contactors are connected in a star shape.
The beneficial effects of the utility model are that: the three-phase asynchronous motor is provided with the contactors and the windings, under the condition that the rated power of the three-phase asynchronous motor is not changed and the electrical parameters (rated voltage, rated current and the like) of each winding are not changed, different connection modes of the windings are changed through switching of different contactors, and according to actual working requirements, the whole circuit can respectively select a first voltage level, a second voltage level and a third voltage level to supply power, so that the effect that the single three-phase asynchronous motor supports power supply of multiple voltage levels is achieved, the working efficiency of the motor is improved, and the using effect of the circuit is enhanced.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a schematic diagram of a first voltage class connection according to the present invention;
fig. 3 is a schematic diagram of a second voltage class connection according to the present invention;
fig. 4 is a third voltage class connection diagram according to the present invention.
In the figure: 1-winding; KM 1-first contactor; KM 2-second contactor; KM 3-third contactor; KM 4-fourth contactor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a circuit for multi-voltage level conversion of a three-phase asynchronous motor comprises an a terminal, a B terminal and a C terminal of the three-phase asynchronous motor, wherein a winding module and a first contactor KM1 are respectively connected in series between every two of the a terminal, the B terminal and the C terminal; the winding module comprises a plurality of windings 1 which are connected in series, a fourth contactor KM4 is also connected between every two adjacent windings 1 in series, a third contactor KM3 is connected between the front ends of every two adjacent windings 1, and a third contactor KM3 is also connected between the rear ends of every two adjacent windings 1; a second contactor KM2 is connected in parallel between the winding module and the first contactor KM1, and three second contactors KM2 are connected in a star shape.
The phase voltages, line voltages, phase currents and line currents of three-phase asynchronous motors are known and will not be described in detail here.
The following embodiments are described by taking as an example two windings 1 and two third contacts KM3 and one fourth contact KM4 provided in the winding module.
Examples 1,
As shown in fig. 2, when the first voltage class power supply of the three-phase asynchronous motor is realized, only the first contactor KM1 and the third contactor KM3 in the circuit need to be communicated, at this time, two windings 1 in each winding module are connected in parallel in the circuit, and the three winding modules are connected end to form a triangular connection mode.
Because in the parallel circuit, the main circuit current is equal to the sum of the currents in each branch circuit, and the voltages at two ends of each branch circuit are equal, namely: the rated voltage of each winding module is equal to the rated voltage of the two windings 1, and the rated voltage values of the three winding modules are also equal;
the current of each winding module is equal to the sum of the rated currents of the two windings 1, and the rated current values of the three winding modules are also equal.
At this time, the line voltage of the three-phase asynchronous motor = the phase voltage, and the line current of the three-phase asynchronous motor = × the phase current.
Examples 2,
As shown in fig. 3, when power supply of the three-phase asynchronous motor at the second voltage level is realized, only the first contactor KM1 and the fourth contactor KM4 in the circuit need to be communicated, at this time, two windings 1 in each winding module are connected in series in the circuit, and the three winding modules are connected end to form a triangular connection mode.
Since in a series circuit the currents in all series elements are the same current, i.e.: the rated current of each winding module is equal to the rated current of the two windings 1, and the rated current values of the three winding modules are also equal;
the total voltage of the series circuit is the sum of the terminal voltages of all elements, i.e.: the voltage of each winding module is equal to the sum of the rated voltages of the two windings 1, and the rated voltage values of the three winding modules are also equal.
At this time, the line voltage of the three-phase asynchronous motor = the phase voltage, and the line current of the three-phase asynchronous motor = × the phase current.
Examples 3,
As shown in fig. 4, when power supply of the three-phase asynchronous motor at the third voltage level is realized, only the second contactor KM2 and the fourth contactor KM4 in the circuit need to be communicated, at this time, three winding modules form a star connection mode, and two windings 1 in each winding module are connected in series in the circuit.
Since in a series circuit the currents in all series elements are the same current, i.e.: the rated current of each winding module is equal to the rated current of the two windings 1, and the rated current values of the three winding modules are also equal;
the total voltage after series connection is the sum of the terminal voltages of all the elements, namely: the voltage of each winding module is equal to the sum of the rated voltages of the two windings 1, and the rated voltage values of the three winding modules are also equal.
At this time, the line voltage of the three-phase asynchronous motor = × the phase voltage, and the line current of the three-phase asynchronous motor = the phase current.
Claims (1)
1. A circuit for multi-voltage grade conversion of a three-phase asynchronous motor comprises an A wiring end, a B wiring end and a C wiring end of the three-phase asynchronous motor, and is characterized in that: a winding module and a first contactor (KM 1) are respectively connected in series between the A terminal, the B terminal and the C terminal; the winding module comprises a plurality of windings (1) which are connected in series, a fourth contactor (KM 4) is also connected in series between the adjacent windings (1), a third contactor (KM 3) is connected between the front ends of the two adjacent windings (1), and a third contactor (KM 3) is also connected between the rear ends of the two adjacent windings (1); a second contactor (KM 2) is connected in parallel between the winding module and the first contactor (KM 1), and the three second contactors (KM 2) are connected in a star shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223030838.4U CN218850486U (en) | 2022-11-15 | 2022-11-15 | Circuit for multi-voltage grade conversion of three-phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223030838.4U CN218850486U (en) | 2022-11-15 | 2022-11-15 | Circuit for multi-voltage grade conversion of three-phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218850486U true CN218850486U (en) | 2023-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223030838.4U Active CN218850486U (en) | 2022-11-15 | 2022-11-15 | Circuit for multi-voltage grade conversion of three-phase asynchronous motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN218850486U (en) |
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2022
- 2022-11-15 CN CN202223030838.4U patent/CN218850486U/en active Active
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