CN115765256A - Three-phase asynchronous motor capable of converting multiple voltage levels and using method thereof - Google Patents
Three-phase asynchronous motor capable of converting multiple voltage levels and using method thereof Download PDFInfo
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- CN115765256A CN115765256A CN202211427901.XA CN202211427901A CN115765256A CN 115765256 A CN115765256 A CN 115765256A CN 202211427901 A CN202211427901 A CN 202211427901A CN 115765256 A CN115765256 A CN 115765256A
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Abstract
The invention discloses a three-phase asynchronous motor capable of converting multiple voltage grades and a using method thereof, 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 method comprises the following steps: when power supply of a first voltage level is realized, the first contactor KM1 is communicated with the third contactor KM3; when power supply of a second voltage level is realized, the first contactor KM1 is communicated with the fourth contactor KM 4; when power supply of a third voltage level is realized, the second contactor KM2 is communicated with the fourth contactor KM 4; the invention realizes that a single three-phase asynchronous motor can convert different voltage levels for power supply, facilitates operation and use and improves working efficiency.
Description
Technical Field
The invention belongs to the technical field of motor control, and particularly relates to a three-phase asynchronous motor capable of converting multiple voltage levels and a using method thereof.
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 is in a loop after short circuit. When three-phase symmetrical windings of the stator are connected with three-symmetrical alternating current power supply, a rotating magnetic field is generated in the air gap between the stator and the rotor of the motor, the rotating magnetic field cuts the stator windings and the rotor windings to respectively induce electromotive force therein, and the rotor electromotive force generates short-circuit current in the rotor windings in a 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.
Disclosure of Invention
The invention aims to provide a three-phase asynchronous motor capable of converting multiple voltage levels and a using method thereof, and aims to solve the problem that the traditional three-phase asynchronous motor only supports one voltage level.
The technical scheme of the invention is as follows: a three-phase asynchronous motor capable of converting multiple voltage grades 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 star.
The invention also provides a using method of the three-phase asynchronous motor capable of converting multiple voltage grades, which can realize the adjustment of different grades of voltages of the three-phase asynchronous motor for power supply by communicating different contactors, and comprises the following specific steps:
when power supply of a three-phase asynchronous motor at a first voltage level is realized, the first contactor is communicated with the third contactor, two windings in each winding module are connected in parallel in a circuit, and the three winding modules are connected end to form a triangular connection mode;
when power supply of a three-phase asynchronous motor at a second voltage level is realized, the first contactor is communicated with the fourth contactor, two windings in each winding module are connected in series in a circuit, and the three winding modules are connected end to form a triangular connection mode;
when the power supply of the three-phase asynchronous motor at the third voltage level is realized, the second contactor is communicated with the fourth contactor, at the moment, the three winding modules form a star connection mode, and two windings in each winding module are connected in series in a circuit.
The invention has the beneficial effects that: on a three-phase asynchronous motor, set up a plurality of contactors and windings, under the circumstances that guarantee three-phase asynchronous motor's rated power is unchangeable, and the electrical parameter (rated voltage, rated current etc.) of every winding is unchangeable, through the switching of different contactors, change the different connected mode of winding, according to the actual work needs, make whole circuit can select first voltage class, second voltage class, third voltage class respectively and supply power, reached the effect that single three-phase asynchronous motor supports the power supply of multiple voltage class, the work efficiency of motor has been improved, the result of use of circuit has been strengthened.
Drawings
FIG. 1 is a circuit schematic of the present invention;
FIG. 2 is a schematic diagram of the connection of a first voltage level according to the present invention;
FIG. 3 is a schematic diagram of the connection of a second voltage level according to the present invention;
FIG. 4 is a schematic diagram of the connection of a third voltage level according to the present invention.
In the figure: 1-winding; KM 1-a 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 three-phase asynchronous motor capable of converting multiple voltage grades 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.
As shown in fig. 2-4, in the following embodiments, two windings 1 and two third contactors KM3 and one fourth contactor KM4 are provided in a winding module, which are known as phase voltage, line voltage, phase current and line current of a three-phase asynchronous motor, and will not be described herein again.
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 current in all series elements is 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 nominal voltages of the two windings 1, and the nominal 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 = × phase voltage, and the line current of the three-phase asynchronous motor = phase current.
Claims (2)
1. The utility model provides a convertible multi-voltage level's three-phase asynchronous machine, includes three-phase asynchronous machine's A wiring end, B wiring end and C wiring end, its 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 three second contactors (KM 2) are connected in a star shape.
2. The use method of the three-phase asynchronous motor capable of converting multiple voltage grades is characterized in that different contactors are communicated, so that the three-phase asynchronous motor can be supplied with power by adjusting voltages of different grades, and the method comprises the following steps:
when power supply of a three-phase asynchronous motor at a first voltage level is realized, a first contactor (KM 1) is communicated with a third contactor (KM 3), two windings (1) in each winding module are connected in parallel in a circuit, and the three winding modules are connected end to form a triangular connection mode;
when power supply of a three-phase asynchronous motor at a second voltage level is realized, a first contactor (KM 1) is communicated with a fourth contactor (KM 4), two windings (1) in each winding module are connected in series in a circuit, and the three winding modules are connected end to form a triangular connection mode;
when power supply of a third voltage class of the three-phase asynchronous motor is realized, the second contactor (KM 2) is communicated with the fourth contactor (KM 4), at the moment, the three winding modules form a star connection mode, and two windings (1) in each winding module are connected in series in a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211427901.XA CN115765256A (en) | 2022-11-15 | 2022-11-15 | Three-phase asynchronous motor capable of converting multiple voltage levels and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211427901.XA CN115765256A (en) | 2022-11-15 | 2022-11-15 | Three-phase asynchronous motor capable of converting multiple voltage levels and using method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115765256A true CN115765256A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211427901.XA Pending CN115765256A (en) | 2022-11-15 | 2022-11-15 | Three-phase asynchronous motor capable of converting multiple voltage levels and using method thereof |
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|---|---|
| CN (1) | CN115765256A (en) |
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- 2022-11-15 CN CN202211427901.XA patent/CN115765256A/en active Pending
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