CN209982381U - Three-speed motor control circuit - Google Patents
Three-speed motor control circuit Download PDFInfo
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- CN209982381U CN209982381U CN201921393452.5U CN201921393452U CN209982381U CN 209982381 U CN209982381 U CN 209982381U CN 201921393452 U CN201921393452 U CN 201921393452U CN 209982381 U CN209982381 U CN 209982381U
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Abstract
The utility model discloses a three-speed motor control circuit, speed governing switch SB1 connect contactor KM 2's normally closed contact KM2-3, normally closed contact KM2-3 connects normally closed contact KM3-3, normally closed contact KM3-3 connects normally closed contact KM4-2, normally closed contact KM4-2 connects time delay disconnection contact 1-3, time delay disconnection contact KT1-3 connects the one end of contactor KM 1; the normally open contact KM1-2 is connected with an instantaneous closed contact KT1-2 of a time relay KT1, the instantaneous closed contact KT1-2 of the time relay KT1 is connected with a normally closed contact KM3-5 of a contactor KM3, the normally closed contact KM3-5 of the contactor KM3 is connected with a normally closed contact KM4-3 of a contactor KM4, and the normally closed contact KM4-3 of the contactor KM4 is connected with one end of the time relay KT 1. The utility model is used for three-phase asynchronous motor's three-speed control, speed governing smoothness and stability are good.
Description
Technical Field
The embodiment of the utility model provides a relate to motor control technical field, concretely relates to three-speed motor control circuit.
Background
As is known, the speed regulation method of the motor includes changing the pole pair number p, changing the slip ratio s, and changing the power frequency f1 (variable frequency speed regulation). The speed regulation by changing magnetic poles is a speed regulation mode which realizes the regulation of the rotating speed of a rotor by changing the pole pair number of the stator winding.
At present, the number of pole pairs of the stator is changed, and the method of changing the stator winding connection is generally adopted to realize the change. The rotor is cage type, and the space distribution of each conducting bar current depends on the distribution of the air gap main magnetic field, so the pole pair number of the magnetomotive force generated by the cage type rotor is always equal to the pole pair number of the air gap magnetic field induced by the cage type rotor. Two groups of independent windings can be arranged on the motor, and the winding connection methods are different to form different pole pairs.
In the prior art, in order to ensure that the number of pole pairs of stator and rotor windings is changed simultaneously to generate effective electromagnetic torque, pole-changing speed regulation is generally only applicable to a squirrel-cage asynchronous motor, for a three-phase asynchronous motor, in order to ensure that the rotation directions of rotors before and after pole changing are not changed, the phase sequence of the three-phase windings must be changed simultaneously when pole changing, mainly because the change of the number of pole pairs can cause the change of the phase sequence, a three-speed control technical scheme for the three-phase asynchronous motor is lacked at present.
SUMMERY OF THE UTILITY MODEL
Therefore, the embodiment of the utility model provides a three-speed motor control circuit for three-speed control of three-phase asynchronous motor, the smoothness and the stability of speed governing are good.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: a three-speed motor control circuit is characterized in that the motor is a three-phase alternating current induction motor, a main circuit of the motor comprises a main contact KM1-1 of a contactor KM1, a main contact KM2-1 of a contactor KM2, a main contact KM3-1 of a contactor KM3, a main contact KM4-1 of a contactor KM4, a time relay KT2, a main contact KM1-1 of a contactor KM1, a main contact KM2-1 of a contactor KM 28 and a main contact KM3-1 of a contactor KM3 are connected in parallel and then connected with a three-phase alternating current power supply, a main contact KM3-1 of the contactor KM3, a heat engine KH 3-1 of the contactor KM3 and a main contact KM3-1 of the contactor KM3 are connected in series, the heat breaking relay KM3-1 of the contactor KM3 is connected in series, one end of the dynamic break contact is connected with the three-phase alternating-current power supply, the other end of the dynamic break contact is connected with a stop switch SB4, one end of the stop switch SB4 is respectively connected with a speed regulation switch SB1, a normally open contact KM1-2 of a contactor KM1, a speed regulation switch SB2, a time delay closed contact KT1-1 of a time relay KT1, a normally open contact KM2-2 of a contactor KM2, a speed regulation switch SB3, a time delay closed contact KT2-1 of a time relay KT2 and a normally open contact KM3-2 of a contactor KM 3;
the speed regulation switch SB1 is connected with a normally closed contact KM2-3 of a contactor KM2, a normally closed contact KM2-3 of a contactor KM2 is connected with a normally closed contact KM3-3 of a contactor KM3, a normally closed contact KM3-3 of a contactor KM3 is connected with a normally closed contact KM4-2 of a contactor KM4, a normally closed contact KM4-2 of a contactor KM4 is connected with a delay disconnection contact KT1-3 of a time relay KT1, and a delay disconnection contact KT1-3 of a relay KT1 is connected with one end of a contactor KM 1;
a normally open contact KM1-2 of the contactor KM1 is connected with an instantaneous closing contact KT1-2 of a time relay KT1, an instantaneous closing contact KT1-2 of the time relay KT1 is connected with a normally closed contact KM3-5 of a contactor KM3, a normally closed contact KM3-5 of the contactor KM3 is connected with a normally closed contact KM4-3 of the contactor KM4, and a normally closed contact KM4-3 of the contactor KM4 is connected with one end of the time relay KT 1; the speed regulation switch SB2 is connected with a normally closed contact KM3-5 of a contactor KM 3;
a delay closing contact KT1-1 of the time relay KT1 is connected with a normally closed contact KM1-3 of a contactor KM1, a normally closed contact KM1-3 of the contactor KM1 is connected with a delay opening contact KT2-3 of a time relay KT2, and a delay opening contact KT2-3 of the time relay KT2 is connected with a linkage contact KM2-5 of a contactor KM 2;
a normally open contact KM2-2 of the contactor KM2 is connected with an instantaneous closing contact KT2-2 of a time relay KT2, and an instantaneous closing contact KT2-2 of the time relay KT2 is connected with a normally open contact KM3-4 of a contactor KM 3; the speed regulation switch SB3 is connected between an instantaneous closing contact KT2-2 of a time relay KT2 and a normally open contact KM3-4 of a contactor KM 3;
a time delay closing contact KT2-1 of the time relay KT2 is connected with a normally open contact KM3-4 of a contactor KM 3; the normally open contact KM3-2 of the contactor KM3 is connected with the normally closed contact KM1-4 of the contactor KM1, the normally closed contact KM1-4 of the contactor KM1 is connected with the normally closed contact KM2-4 of the contactor KM2, and the normally closed contact KM2-4 of the contactor KM2 is respectively connected with one end of the contactor KM3 and one end of the contactor KM 4.
Preferably, as a three-speed motor control circuit, a fuse FU1 is connected between the main contact KM1-1 of the contactor KM1, the main contact KM2-1 of the contactor KM2, the main contact KM3-1 of the contactor KM3 and a three-phase alternating current power supply, and a fuse FU2 is connected between the dynamic breaking contact of the thermal relay KH2 and the three-phase alternating current power supply.
As a preferable scheme of the control circuit of the three-speed motor, the speed regulation switch SB1 is connected between a normally open contact KM1-2 of a contactor KM1 and an instant closing contact KT1-2 of a time relay KT 1.
As a preferable scheme of the three-speed motor control circuit, the speed regulation switch SB2 is connected between a delay closed contact KT1-1 of a time relay KT1 and a normally closed contact KM1-3 of a contactor KM1, and a normally open contact KM2-2 of the contactor KM2 is communicated with an instantaneous closed contact KT2-2 of the time relay KT2 and then connected between a delay closed contact KT1-1 of the time relay KT1 and a normally closed contact KM1-3 of the contactor KM 1.
As a preferred scheme of a three-speed motor control circuit, a normally open contact KM3-4 of a contactor KM3 is connected with one end of a time relay KT 2; the time-delay closed contact KT2-1 of the time relay KT2 is communicated with the normally open contact KM3-4 of the contactor KM3 and then is connected between the normally open contact KM3-2 of the contactor KM3 and the normally closed contact KM1-4 of the contactor KM 1.
The embodiment of the utility model provides a three-speed control for three-phase asynchronous motor satisfies the motor operation speed governing demand, and the smoothness and the stability of speed governing are good, and the life of extension motor ensures motor safe operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic diagram of a control circuit of a three-speed motor provided in an embodiment of the present invention.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a three-speed motor control circuit is provided, the motor is a three-phase alternating current induction motor, a main circuit of the motor comprises a main contact KM1-1 of a contactor KM1, a main contact KM2-1 of a contactor KM2, a main contact KM3-1 of a contactor KM3, a main contact KM4-1 of a contactor KM4, a time relay KT1 and a time relay KT2, the main contact KM1-1 of the contactor KM1, the main contact KM2-1 of the contactor KM2 and the main contact KM3-1 of the contactor KM3 are connected in parallel and then connected with a three-phase alternating current power supply, the main contact KM3-1 of the contactor KM3 and a heat engine KH 3-1 of the contactor KM3 are connected in series, the heat engine KH 3 is connected between the main contact KM3-1 of the contactor KM3 and the heat relay 3 in series, the heat-break relay is connected in series, the one end of disconnected contact is connected three-phase AC power supply, the other end of disconnected contact is connected with stop switch SB4, the one end of stop switch SB4 is connected to speed governing switch SB1, contactor KM 1's normally open contact KM1-2, speed governing switch SB2, time relay KT 1's time delay closed contact KT1-1, contactor KM 2's normally open contact KM2-2, speed governing switch SB3, time relay KT 2's time delay closed contact KT2-1 and contactor KM 3's normally open contact KM3-2 respectively.
The speed regulation switch SB1 is connected with a normally closed contact KM2-3 of a contactor KM2, a normally closed contact KM2-3 of a contactor KM2 is connected with a normally closed contact KM3-3 of a contactor KM3, a normally closed contact KM3-3 of a contactor KM3 is connected with a normally closed contact KM4-2 of a contactor KM4, a normally closed contact KM4-2 of a contactor KM4 is connected with a delay disconnection contact KT1-3 of a time relay KT1, and a delay disconnection contact KT1-3 of a relay KT1 is connected with one end of a contactor KM 1.
The normally open contact KM1-2 of the contactor KM1 is connected with the instantaneously closed contact KT1-2 of the time relay KT1, the instantaneously closed contact KT1-2 of the time relay KT1 is connected with the normally closed contact KM3-5 of the contactor KM3, the normally closed contact KM3-5 of the contactor KM3 is connected with the normally closed contact KM4-3 of the contactor KM4, and the normally closed contact KM4-3 of the contactor KM4 is connected with one end of the time relay KT 1; the speed regulation switch SB2 is connected with a normally closed contact KM3-5 of a contactor KM 3.
The time delay switch-on contact KT1-1 of the time relay KT1 is connected with a normally closed contact KM1-3 of a contactor KM1, a normally closed contact KM1-3 of the contactor KM1 is connected with a time delay switch-off contact KT2-3 of a time relay KT2, and a time delay switch-off contact KT2-3 of the time relay KT2 is connected with a linkage contact KM2-5 of a contactor KM 2.
Wherein, a normally open contact KM2-2 of the contactor KM2 is connected with an instantaneous closing contact KT2-2 of a time relay KT2, and an instantaneous closing contact KT2-2 of the time relay KT2 is connected with a normally open contact KM3-4 of a contactor KM 3; the speed regulation switch SB3 is connected between the instantaneous closing contact KT2-2 of the time relay KT2 and the normally open contact KM3-4 of the contactor KM 3.
Wherein, a time-delay closed contact KT2-1 of the time relay KT2 is connected with a normally open contact KM3-4 of a contactor KM 3; the normally open contact KM3-2 of the contactor KM3 is connected with the normally closed contact KM1-4 of the contactor KM1, the normally closed contact KM1-4 of the contactor KM1 is connected with the normally closed contact KM2-4 of the contactor KM2, and the normally closed contact KM2-4 of the contactor KM2 is respectively connected with one end of the contactor KM3 and one end of the contactor KM 4.
Specifically, a fuse FU1 is connected between a main contact KM1-1 of the contactor KM1, a main contact KM2-1 of the contactor KM2, and a main contact KM3-1 of the contactor KM3 and a three-phase alternating-current power supply, and a fuse FU2 is connected between a dynamic breaking contact of the thermal relay KH2 and the three-phase alternating-current power supply. The speed regulation switch SB1 is connected between a normally open contact KM1-2 of a contactor KM1 and an instant closing contact KT1-2 of a time relay KT 1. The speed regulation switch SB2 is connected between a delay closed contact KT1-1 of a time relay KT1 and a normally closed contact KM1-3 of a contactor KM1, and a normally open contact KM2-2 of the contactor KM2 is communicated with an instantaneous closed contact KT2-2 of the time relay KT2 and then connected between a delay closed contact KT1-1 of the time relay KT1 and a normally closed contact KM1-3 of the contactor KM 1. A normally open contact KM3-4 of the contactor KM3 is connected with one end of a time relay KT 2; the time-delay closed contact KT2-1 of the time relay KT2 is communicated with the normally open contact KM3-4 of the contactor KM3 and then is connected between the normally open contact KM3-2 of the contactor KM3 and the normally closed contact KM1-4 of the contactor KM 1.
The principle of the utility model is that, a speed regulation switch SB is pressed down, the coil of a time relay KT is energized, the instantaneous closing contact KT-2 of the time relay KT is closed, the normally closed contact KM-5 of a contactor KM is connected with the normally closed contact KM-3 of the contactor KM, the normally closed contact KM-3 of the contactor KM is connected with one end of the time relay KT, the coil of the time relay KT is energized, the instantaneous closing contact KT-2 of the time relay KT is closed, the normally closed contact KM-3 of the contactor KM is connected with the normally closed contact KM-3 of the contactor KM, the normally closed contact KM-3 of the contactor KM is connected with the normally closed contact KM-2 of the time relay KT, the normally closed contact KM-2 of the time relay KT is connected with the delay opening contact KT-3 of the time relay KT, the delay opening contact KT-3 of the time relay KT is connected with one end of the contactor KM, the coil of the contactor KM is energized, the main contact KM-1 of the contactor KM is energized, the normally closed contact KM-3, the control circuit is energized, the slow-KM is energized, the slow-open contact KM, the slow-contact KM is closed contact KM, the slow-contact KM is connected with the slow contact KM, the slow contact KM is connected with the slow contact KM, the slow contact KM is connected with the slow contact KM, the.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. A three-speed motor control circuit is characterized in that a main circuit of the motor is a three-phase alternating current induction motor, the main circuit of the motor comprises a main contact KM1-1 of a contactor KM1, a main contact KM2-1 of a contactor KM2, a main contact KM3-1 of a contactor KM3, a main contact KM4-1 of a contactor KM4, a time relay KT1 and a time relay KT2, the main contact KM1-1 of the contactor KM1, the main contact 84KM 53-1 of a contactor KM2 and the main contact KM3-1 of the contactor KM3 are connected in parallel and then connected with a three-phase alternating current power supply, the main contact KM1-1 of a contactor KM1, the main contact KM2-1 of the contactor KM2, a heat engine KH 2-1 of the contactor KM2 and the motor are connected in series, the main contact KM2-1 of the contactor KM2,
the control circuit comprises a break contact of a thermal relay KH2, one end of the break contact is connected with the three-phase alternating-current power supply, the other end of the break contact is connected with a stop switch SB4, one end of the stop switch SB4 is respectively connected with a speed regulation switch SB1, a normally open contact KM1-2 of a contactor KM1, a speed regulation switch SB2, a time delay closing contact KT1-1 of a time relay KT1, a normally open contact KM2-2 of a contactor KM2, a speed regulation switch SB3, a time delay closing contact KT2-1 of the time relay KT2 and a normally open contact KM3-2 of a contactor KM 3;
the speed regulation switch SB1 is connected with a normally closed contact KM2-3 of a contactor KM2, a normally closed contact KM2-3 of a contactor KM2 is connected with a normally closed contact KM3-3 of a contactor KM3, a normally closed contact KM3-3 of a contactor KM3 is connected with a normally closed contact KM4-2 of a contactor KM4, a normally closed contact KM4-2 of a contactor KM4 is connected with a delay disconnection contact KT1-3 of a time relay KT1, and a delay disconnection contact KT1-3 of a relay KT1 is connected with one end of a contactor KM 1;
a normally open contact KM1-2 of the contactor KM1 is connected with an instantaneous closing contact KT1-2 of a time relay KT1, an instantaneous closing contact KT1-2 of the time relay KT1 is connected with a normally closed contact KM3-5 of a contactor KM3, a normally closed contact KM3-5 of the contactor KM3 is connected with a normally closed contact KM4-3 of the contactor KM4, and a normally closed contact KM4-3 of the contactor KM4 is connected with one end of the time relay KT 1; the speed regulation switch SB2 is connected with a normally closed contact KM3-5 of a contactor KM 3;
a delay closing contact KT1-1 of the time relay KT1 is connected with a normally closed contact KM1-3 of a contactor KM1, a normally closed contact KM1-3 of the contactor KM1 is connected with a delay opening contact KT2-3 of a time relay KT2, and a delay opening contact KT2-3 of the time relay KT2 is connected with a linkage contact KM2-5 of a contactor KM 2;
a normally open contact KM2-2 of the contactor KM2 is connected with an instantaneous closing contact KT2-2 of a time relay KT2, and an instantaneous closing contact KT2-2 of the time relay KT2 is connected with a normally open contact KM3-4 of a contactor KM 3; the speed regulation switch SB3 is connected between an instantaneous closing contact KT2-2 of a time relay KT2 and a normally open contact KM3-4 of a contactor KM 3;
a time delay closing contact KT2-1 of the time relay KT2 is connected with a normally open contact KM3-4 of a contactor KM 3; the normally open contact KM3-2 of the contactor KM3 is connected with the normally closed contact KM1-4 of the contactor KM1, the normally closed contact KM1-4 of the contactor KM1 is connected with the normally closed contact KM2-4 of the contactor KM2, and the normally closed contact KM2-4 of the contactor KM2 is respectively connected with one end of the contactor KM3 and one end of the contactor KM 4.
2. The control circuit of claim 1, wherein a fuse FU1 is connected between the main contact KM1-1 of the contactor KM1, the main contact KM2-1 of the contactor KM2, the main contact KM3-1 of the contactor KM3 and the three-phase ac power supply, and a fuse FU2 is connected between the dynamic breaking contact of the thermal relay KH2 and the three-phase ac power supply.
3. A three-speed motor control circuit according to claim 1, characterized in that the speed regulation switch SB1 is connected between the normally open contact KM1-2 of the contactor KM1 and the instantaneously closed contact KT1-2 of the time relay KT 1.
4. The control circuit of the three-speed motor as claimed in claim 1, wherein the speed regulation switch SB2 is connected between the delay closing contact KT1-1 of the time relay KT1 and the normally closed contact KM1-3 of the contactor KM1, and the normally open contact KM2-2 of the contactor KM2 is connected between the delay closing contact KT1-1 of the time relay KT1 and the normally closed contact KM1-3 of the contactor KM1 after being connected with the instantaneously closing contact KT2-2 of the time relay KT 2.
5. The control circuit of the three-speed motor according to claim 1, wherein a normally open contact KM3-4 of a contactor KM3 is connected with one end of a time relay KT 2; the time-delay closed contact KT2-1 of the time relay KT2 is communicated with the normally open contact KM3-4 of the contactor KM3 and then is connected between the normally open contact KM3-2 of the contactor KM3 and the normally closed contact KM1-4 of the contactor KM 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921393452.5U CN209982381U (en) | 2019-08-26 | 2019-08-26 | Three-speed motor control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921393452.5U CN209982381U (en) | 2019-08-26 | 2019-08-26 | Three-speed motor control circuit |
Publications (1)
| Publication Number | Publication Date |
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| CN209982381U true CN209982381U (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921393452.5U Active CN209982381U (en) | 2019-08-26 | 2019-08-26 | Three-speed motor control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN209982381U (en) |
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2019
- 2019-08-26 CN CN201921393452.5U patent/CN209982381U/en active Active
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