CN210693812U - Driving circuit of three-phase motor - Google Patents
Driving circuit of three-phase motor Download PDFInfo
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- CN210693812U CN210693812U CN201921649004.7U CN201921649004U CN210693812U CN 210693812 U CN210693812 U CN 210693812U CN 201921649004 U CN201921649004 U CN 201921649004U CN 210693812 U CN210693812 U CN 210693812U
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Abstract
The utility model relates to a drive circuit of three-phase motor, it adopts at least three relay, receives first signal and second signal for wherein two electricity connect the relay contact selective actuation of three-phase electricity input and motor wiring end, thereby the positive and negative rotation of control motor. After adopting above-mentioned technical scheme, through weak current control forceful electric power for the drive circuit structure is exquisite, and volume and cost are all compared and are effectively reduced in adopting ac contactor, and the development of the smart small-size motor actuating mechanism of being convenient for is used.
Description
Technical Field
The utility model relates to a three-phase motor control field, more specifically, relate to a three-phase motor's drive circuit.
Background
Existing three-phase motor drive circuits are typically switched and commutated by ac contactors. However, since the installation space of the field pipeline is limited, the design of the motor actuator is required to be developed toward a compact size, and the ac contactor cannot be installed on the compact motor actuator due to its large size, so that the existing motor driving circuit needs to be improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve above-mentioned technical problem, provide a three-phase motor's drive circuit.
In order to achieve the above object, the present invention provides a driving circuit of a three-phase motor, which includes:
a first power supply unit having a first phase line, a second phase line and a third phase line for outputting three-phase power;
a second power supply unit that outputs direct current;
a motor terminal having a first terminal, a second terminal and a third terminal to receive input of the three-phase power;
the reversing unit comprises a first relay, a second relay and a third relay; the first relay and the second relay are respectively and electrically connected with the second power supply unit through a normally open contact and a normally closed contact of the third relay; the third relay is electrically connected with the second power supply unit;
a control unit which leads out a first signal terminal and a second signal terminal and switches and outputs a first signal and a second signal; the first signal terminal is electrically connected with the first relay and the third relay, and the second signal terminal is electrically connected with the second relay; when the first signal terminal outputs a first signal, the first relay and the third relay act, and when the second signal terminal outputs a second signal, the second relay acts;
the first phase line is electrically connected with the second wiring terminal and the first wiring terminal through normally open contacts of a first relay and a second relay respectively; the second phase wire is electrically connected with the first wiring terminal and the second wiring terminal through normally open contacts of a first relay and a second relay respectively; and the third phase line is electrically connected with the third wiring terminal.
In one embodiment: the first signal and the second signal are both voltage signals, and the voltage values of the first signal and the second signal are both lower than the voltage value provided by the second power supply unit.
In one embodiment: the first phase line is electrically connected with the first wiring terminal through a first cement resistor and a first capacitor, and is also electrically connected with the second wiring terminal through a second cement resistor and a second capacitor;
the second phase line is electrically connected with the first wiring terminal through a third cement resistor and a third capacitor, and is also electrically connected with the second wiring terminal through a fourth cement resistor and a fourth capacitor.
In one embodiment: and the third phase line is electrically connected with the first wiring terminal, the second wiring terminal and the third wiring terminal respectively through the first piezoresistor, the second piezoresistor and the third piezoresistor.
In one embodiment: the device also comprises a fourth relay and a fifth relay;
the fourth relay and the fifth relay are respectively and electrically connected with the second power supply unit through a normally open contact and a normally closed contact of the third relay;
the first signal terminal is electrically connected with a fourth relay, and the second signal terminal is electrically connected with a fifth relay; when the first signal terminal outputs a first signal, the fourth relay operates, and when the second signal terminal outputs a second signal, the fifth relay operates;
the first phase line is electrically connected with the second wiring terminal through a normally open contact of a fourth relay, and is also electrically connected with the first wiring terminal through a normally open contact of a fifth relay; the second phase wire is electrically connected with the first wiring terminal through a normally open contact of a fourth relay, and is also electrically connected with the second wiring terminal through a normally open contact of a fifth relay.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) the drive circuit of the embodiment of the utility model adopts the switching control unit to output the first signal and the second signal to control the actuation of the relay contact, so as to control the positive rotation or the negative rotation of the motor; strong current is controlled through weak current, so that the structure of a driving circuit is exquisite, the volume is reduced by more than 3 times compared with that of an alternating current contactor, development and use of a small and exquisite motor actuating mechanism are facilitated, and the cost is only 30% of that of the alternating current contactor;
(2) the drive circuit of the embodiment of the utility model synchronously controls the first relay and the third relay through the first signal, so that the third relay loses power when outputting the second signal, thereby preventing the first relay and the second relay from being simultaneously attracted due to faults, further causing the possibility of burning out of the motor, realizing the interlocking function of positive and negative rotation of the motor and ensuring the normal operation of the motor;
(3) the driving circuit provided by the embodiment of the utility model has the advantages that the back electromotive force when the motor is started and stopped can be effectively eliminated by adding the motor arc extinguishing circuit consisting of the cement resistor, the capacitor and the piezoresistor between the first power supply unit and the motor wiring end, and the normal operation of the motor is protected;
(4) the utility model discloses drive circuit adopts fourth relay and fifth relay, and make it respectively with first relay and the cooperation of second relay to reduce the relay and lose the electricity back contact and keep the actuation, cause the possibility that the motor burns out the emergence.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a partial circuit structure according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first power supply unit according to a first embodiment of the present invention;
fig. 3 is a schematic structural view of a motor terminal according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control unit according to a first embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an arc extinguishing circuit of a first phase line and a second phase line according to a second embodiment of the present invention;
fig. 6 is a schematic circuit diagram of an arc extinguishing circuit of a third phase line according to a second embodiment of the present invention;
fig. 7 is a schematic diagram of a part of a circuit structure according to a third embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are preferred embodiments of the invention and should not be considered as excluding other embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence. In the claims, the specification and the drawings, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting. In the claims, the description and the drawings of the present invention, if the term "electrically connected" is used, it is meant to include both direct electrical connection and indirect electrical connection.
Referring first to fig. 1 to 4, a driving circuit of a three-phase motor according to a first embodiment of the present invention includes: a first power supply unit SK101, a second power supply unit, a motor terminal SK201, a commutation unit, and a control unit SK 301.
The first power supply unit SK101 is led out of a first phase line, a second phase line and a third phase line, and is used for outputting three-phase power.
The second power supply unit is used for outputting direct current. In this embodiment, the voltage value of the direct current is + 24V.
The motor terminal SK201 is provided with a first terminal, a second terminal and a third terminal which are respectively used for receiving the input of the three-phase power to supply power to the motor.
The commutation unit comprises a first relay K301-1, a second relay K302-1 and a third relay K300. The first relay K301-1 is electrically connected with the second power supply unit through a normally open contact of the third relay K300, and the second relay K302-1 is electrically connected with the second power supply unit through a normally closed contact of the third relay K300. The third relay K300 is electrically connected to the second power supply unit. The first phase line is electrically connected with the second wiring terminal and the first wiring terminal through normally open contacts of a first relay K301-1 and a second relay K302-1 respectively; the second phase wire is electrically connected with the first wiring terminal and the second wiring terminal through normally open contacts of a first relay K301-1 and a second relay K302-1 respectively; and the third phase line is electrically connected with the third wiring terminal.
The control unit SK301 is electrically connected to the second power supply unit to receive direct current power supply thereof, and draws out a first signal terminal C1_ Relay and a second signal terminal C2_ Relay to switch and output a first signal and a second signal. The first signal terminal C1_ Relay is electrically connected to the first Relay K301-1 and the third Relay K300, and the second signal terminal C2_ Relay is electrically connected to the second Relay K302 s-1. In this embodiment, the first signal and the second signal are both voltage signals, and the voltage values thereof are both lower than the voltage value provided by the second power supply unit, and optionally + 5V.
Therefore, the second power supply unit, the third Relay K300 and the first signal terminal C1_ Relay form a loop, when the first signal terminal outputs a first signal, the loop is conducted, the third Relay K300 acts to pull in a normally open contact, so that the second power supply unit, the first Relay K301-1 and the first signal terminal C1_ Relay form a loop and are conducted, the first Relay acts to pull in a normally open contact, so that the first phase line and the second phase line are respectively electrically communicated with the second wiring terminal and the first wiring terminal, and the motor is reversed. Correspondingly, when the second signal terminal C2_ Relay outputs a second signal, the third Relay K300 does not act, the second Relay K302-1 is electrically connected with the second power supply unit through the normally closed contact of the third Relay K300 and forms a conductive loop with the second signal terminal C2_ Relay, and the second Relay K302-1 acts to pull in the normally open contact, so that the first phase line and the second phase line are respectively electrically communicated with the first wiring terminal and the second wiring terminal, and the motor rotates forwards. Therefore, by the switching control unit SK301 outputting the first signal and the second signal, the forward rotation or the reverse rotation of the motor can be controlled.
The utility model discloses drive circuit through weak current control forceful electric power, and the drive circuit structure is exquisite, and the volume ratio adopts ac contactor to dwindle more than 3 times, and the development of the smart small-size motor actuating mechanism of being convenient for is used, and its cost is also only 30% that adopt ac contactor.
In addition, the first relay K301-1 and the third relay K300 are synchronously controlled through the first signal, so that the third relay loses power when the second signal is output, the possibility that the motor is burnt out due to the fact that the first relay K301-1 and the second relay K302-1 are attracted simultaneously due to faults is further prevented, the interlocking function of forward and reverse rotation of the motor is achieved, and the normal operation of the motor is guaranteed.
Referring to fig. 5 and 6, in the second embodiment, a motor arc extinguishing circuit is further added to the driving circuit, which can effectively eliminate back electromotive force when the motor is started and stopped, and protect the normal operation of the motor. Specifically, the first phase line is electrically connected with the first wiring terminal through a first cement resistor R301-1 and a first capacitor C301-1, and is also electrically connected with the second wiring terminal through a second cement resistor R302-1 and a second capacitor C302-1. The second phase line is electrically connected with the first connecting terminal through a third cement resistor R301-2 and a third capacitor C301-2, and is also electrically connected with the second connecting terminal through a fourth cement resistor R302-2 and a fourth capacitor C302-2. In addition, the third phase line is electrically connected with the first connection terminal, the second connection terminal and the third connection terminal respectively through the first piezoresistor R321, the second piezoresistor R322 and the third piezoresistor R323.
Referring to fig. 7, in a further embodiment, since the first relay K301-1 and the second relay K302-1 may generate a phenomenon that the contacts are kept in engagement after power failure, the driving circuit further includes a fourth relay K301-2 and a fifth relay K302-2, which are respectively matched with the first relay and the second relay, so as to reduce the possibility that the contacts are kept in engagement after power failure of the relays, which causes the occurrence of motor burnout.
In a specific structure, the fourth relay K301-2 and the fifth relay K302-2 are electrically connected to the second power supply unit through a normally open contact and a normally closed contact of the third relay K300, respectively. The first signal terminal C1_ Ralay is electrically connected with the fourth relay K301-2, and the second signal terminal C2_ Ralay is electrically connected with the fifth relay K302-2; when the first signal terminal C1_ delay outputs a first signal, the fourth relay K301-2 operates, and when the second signal terminal C2_ delay outputs a second signal, the fifth relay K302-2 operates. The first phase line is electrically connected with the second wiring terminal through a normally open contact of a fourth relay K301-2 and is also electrically connected with the first wiring terminal through a normally open contact of a fifth relay K302-2; the second phase wire is electrically connected with the first connecting terminal through a normally open contact of a fourth relay K301-2 and is also electrically connected with the second connecting terminal through a normally open contact of a fifth relay K302-2. Therefore, even if the contact keeps attracting after the first relay K301-1 loses power, the first phase line and the second phase line are disconnected with the first wiring terminal and the second wiring terminal after the contact of the fourth relay K301-2 is disconnected, and therefore the motor can stably rotate forwards.
The description of the above specification and examples is intended to illustrate the scope of the invention, but should not be construed as limiting the scope of the invention. Modifications, equivalents and other improvements which may be made to the embodiments of the invention or to some of the technical features thereof by a person of ordinary skill in the art through logical analysis, reasoning or limited experimentation in light of the above teachings of the invention or the above embodiments are intended to be included within the scope of the invention.
Claims (5)
1. A drive circuit for a three-phase motor, comprising:
a first power supply unit having a first phase line, a second phase line and a third phase line for outputting three-phase power;
a second power supply unit that outputs direct current;
a motor terminal having a first terminal, a second terminal and a third terminal to receive input of the three-phase power;
the reversing unit comprises a first relay, a second relay and a third relay; the first relay and the second relay are respectively and electrically connected with the second power supply unit through a normally open contact and a normally closed contact of the third relay; the third relay is electrically connected with the second power supply unit;
a control unit which leads out a first signal terminal and a second signal terminal and switches and outputs a first signal and a second signal; the first signal terminal is electrically connected with the first relay and the third relay, and the second signal terminal is electrically connected with the second relay; when the first signal terminal outputs a first signal, the first relay and the third relay act, and when the second signal terminal outputs a second signal, the second relay acts;
the first phase line is electrically connected with the second wiring terminal and the first wiring terminal through normally open contacts of a first relay and a second relay respectively; the second phase wire is electrically connected with the first wiring terminal and the second wiring terminal through normally open contacts of a first relay and a second relay respectively; and the third phase line is electrically connected with the third wiring terminal.
2. A drive circuit of a three-phase motor according to claim 1, characterized in that: the first signal and the second signal are both voltage signals, and the voltage values of the first signal and the second signal are both lower than the voltage value provided by the second power supply unit.
3. A drive circuit of a three-phase motor according to claim 1, characterized in that:
the first phase line is electrically connected with the first wiring terminal through a first cement resistor and a first capacitor, and is also electrically connected with the second wiring terminal through a second cement resistor and a second capacitor;
the second phase line is electrically connected with the first wiring terminal through a third cement resistor and a third capacitor, and is also electrically connected with the second wiring terminal through a fourth cement resistor and a fourth capacitor.
4. A drive circuit of a three-phase motor according to claim 3, characterized in that: and the third phase line is electrically connected with the first wiring terminal, the second wiring terminal and the third wiring terminal respectively through the first piezoresistor, the second piezoresistor and the third piezoresistor.
5. A drive circuit of a three-phase motor according to claim 1, characterized in that: the device also comprises a fourth relay and a fifth relay;
the fourth relay and the fifth relay are respectively and electrically connected with the second power supply unit through a normally open contact and a normally closed contact of the third relay;
the first signal terminal is electrically connected with a fourth relay, and the second signal terminal is electrically connected with a fifth relay; when the first signal terminal outputs a first signal, the fourth relay operates, and when the second signal terminal outputs a second signal, the fifth relay operates;
the first phase line is electrically connected with the second wiring terminal through a normally open contact of a fourth relay, and is also electrically connected with the first wiring terminal through a normally open contact of a fifth relay; the second phase wire is electrically connected with the first wiring terminal through a normally open contact of a fourth relay, and is also electrically connected with the second wiring terminal through a normally open contact of a fifth relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921649004.7U CN210693812U (en) | 2019-09-30 | 2019-09-30 | Driving circuit of three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921649004.7U CN210693812U (en) | 2019-09-30 | 2019-09-30 | Driving circuit of three-phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210693812U true CN210693812U (en) | 2020-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921649004.7U Active CN210693812U (en) | 2019-09-30 | 2019-09-30 | Driving circuit of three-phase motor |
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| Country | Link |
|---|---|
| CN (1) | CN210693812U (en) |
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2019
- 2019-09-30 CN CN201921649004.7U patent/CN210693812U/en active Active
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