CN206060611U - Possesses the three phase alternating current motor rotating control module of output interlocking function - Google Patents
Possesses the three phase alternating current motor rotating control module of output interlocking function Download PDFInfo
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- CN206060611U CN206060611U CN201621023394.3U CN201621023394U CN206060611U CN 206060611 U CN206060611 U CN 206060611U CN 201621023394 U CN201621023394 U CN 201621023394U CN 206060611 U CN206060611 U CN 206060611U
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Abstract
The utility model discloses a kind of three phase alternating current motor rotating control module for possessing output interlocking function，Including the twin coil magnetic latching relay of two groups of conversion types、3 phase AC solid relay circuit connects circuit with time delay，The twin coil magnetic latching relay is connected between the input of outfan and three phase electric machine of three phase mains，Constitute the rotating power supply control loop of three phase electric machine，The twin coil of the twin coil magnetic latching relay connects rotating forward control signal input respectively and reverse control signal input constitutes driving circuit，The 3 phase AC solid relay is serially connected between the outfan of input and twin coil magnetic latching relay of three phase electric machine，Realize the connecting and disconnecting of three phase electric machine load，The rotating forward control signal input and reverse control signal input are connected with the control signal of 3 phase AC solid relay by delay turn-on circuit.This utility model has output logical interlock function, and short-circuit loop will not be constituted between the phase of three-phase electricity source.
Description
Technical field
This utility model belongs to Motor Control Field, more particularly to a kind of three-phase alternating current for possessing output interlocking function
Machine rotating control module.
Background technology
With expanding economy and the progress of science and technology, electric operator is more and more wider in the application of industrial circle
It is general, while the control technology of electric operator there has also been certain progress and renewal, during three phase electric machine is electric operator
The most frequently used one kind.
The realization of ac three-phase asynchronous motor rotating switching is by changing any biphase electricity in three phase electric machine load
The phase sequence in source is realizing.Three phase alternating current motor rotating control module common in the art is solid switch, it is internal by
Photoelectric isolating circuit, controllable silicon drive circuit, input logic interlock circuit are constituted, and with small volume, contactless spark, work can
By the advantages of.However, this kind of product is present when around due to forming proper logical interlock loop in outfan
Power supply is easily caused during serious electromagnetic interference short-circuit between phase and phase, so as to burn module.
The content of the invention
This utility model purpose is to provide a kind of with output logical interlock function, three-phase electricity to solve the above problems
Source between phase and phase will not be short-circuit, the three phase alternating current motor rotating control mould for possessing output interlocking function of long service life
Block.
For this purpose, a kind of the utility model discloses three phase alternating current motor rotating control mould for possessing output interlocking function
Block, including the twin coil magnetic latching relay of two groups of conversion types, 3 phase AC solid relay circuit connect circuit, institute with time delay
State twin coil magnetic latching relay to be connected between the input of outfan and three phase electric machine of three phase mains, constitute three phase electric machine
Rotating power supply control loop, the twin coil of the twin coil magnetic latching relay connect rotating forward control signal input and anti-respectively
Turn control signal input constitute driving circuit, the 3 phase AC solid relay be serially connected in the input of three phase electric machine with it is double
Between the outfan of coil magnetic latching relay, the connecting and disconnecting of three phase electric machine load are realized, the rotating forward control signal is defeated
Enter end and reverse control signal input is connected with the control signal of 3 phase AC solid relay by delay turn-on circuit.
Further, the 3 phase AC solid relay circuit includes photoelectrical coupler A1-A6 and three groups of controllable silicon moulds
Block SCRS1-SCRS3, the silicon controlled module SCRS1-SCRS3 are constituted by two one-way SCR parallel connected in reverse phase, the light
The input series connection of electric coupler A1 and A2 is followed by between the outfan SSR+ and ground that circuit is connected in time delay, the photoelectric coupling
First control end of the latter termination silicon controlled module SCRS1 of outfan series connection of device A1 and A2, while series resistance R16 connects two-wire
The first switch common port EMR-U1 of circle magnetic latching relay, other end series resistance R23 connect the second of silicon controlled module SCRS1
Control end, while series resistance R23 and R17 meet the first input end L1 of three phase electric machine, the silicon controlled module SCRS1 is connected on double
Between the first input end L1 of the first switch common port EMR-U1 and three phase electric machine of coil magnetic latching relay, the controllable silicon
Module SCRS1 is also in parallel with the resistance R25 and electric capacity C3 that connect, and the input series connection of the photoelectrical coupler A3 and A4 is followed by
Time delay is connected between the outfan SSR+ and ground of circuit, and the latter termination of outfan series connection of the photoelectrical coupler A3 and A4 is controllable
First control end of silicon module SCRS2, while series resistance R18 connects the second switch common port of twin coil magnetic latching relay
EMR-V1, other end series resistance R22 connect second control end of silicon controlled module SCRS2, while series resistance R22 and R19 connect
The second switch that second input L2 of three phase electric machine, the silicon controlled module SCRS2 are connected on twin coil magnetic latching relay is public
Altogether hold EMR-V1 and the second input L2 of three phase electric machine between, the silicon controlled module SCRS2 also with the resistance R26 for connecting and
Electric capacity C4 is in parallel, and the photoelectrical coupler A5 is followed by connecting the outfan SSR+ of circuit and ground in time delay with the input series connection of A6
Between, first control end of the latter termination silicon controlled module SCRS3 of outfan series connection of the photoelectrical coupler A5 and A6, while
Series resistance R20 meets an outfan W of three phase mains, and other end series resistance R24 connects second control of silicon controlled module SCRS3
End, while series resistance R24 and R21 meet the 3rd input L3 of three phase electric machine, the silicon controlled module SCRS3 is connected on three-phase electricity
Between the one outfan W and the 3rd input L3 of three phase electric machine in source, the silicon controlled module SCRS3 also with the resistance connected
R28 and electric capacity C5 are in parallel.
Further, the time delay connect circuit include diode D1-D8, audion Q1-Q4, operational amplifier IC1A and
Operational amplifier IC1B, forward direction series diode D1 and D5 connects the base of audion Q1 to the rotating forward control signal input successively
Pole, the base stage of the collector connecting transistor Q2 of the audion Q1, the grounded emitter of the audion Q1 and Q2, diode D1
Negative terminal be connected with the anode of diode D7, negative terminal series capacitance E1 of diode D7 ground connection, the base series electricity of audion Q2
Resistance R9 connects the negative terminal of diode D7, and anode series resistance R4 of the diode D7 connects the outfan of operational amplifier IC1A, together
When be sequentially connected in series resistance R2 and R3 ground connection and be sequentially connected in series resistance R11 and electric capacity DE1 ground connection, the operational amplifier IC1A's
The colelctor electrode of node and audion Q2 between homophase input terminating resistor R11 and electric capacity DE1, the operational amplifier IC1A
Anti-phase input terminating resistor R2 and R3 between node, the anode of the power supply terminating diode D7 of operational amplifier IC1A, fortune
The outfan forward direction series diode D3 for calculating amplifier IC1A connects the outfan SSR+ of circuit, the reversion control as time delay
Forward direction series diode D2 and D6 connects the base stage of audion Q3 to signal input part successively, and the colelctor electrode of the audion Q3 connects three poles
The base stage of pipe Q4, the grounded emitter of the audion Q3 and Q4, the negative terminal of diode D2 are connected with the anode of diode D8, and two
The negative terminal series capacitance E2 ground connection of pole pipe D8, base series resistor R10 of audion Q4 connect the negative terminal of diode D8, two pole
Anode series resistance R8 of pipe D8 connects the outfan of operational amplifier IC1B, at the same be sequentially connected in series resistance R6 and R7 ground connection and according to
Secondary series resistance R12 and electric capacity DE2 ground connection, the homophase input terminating resistor R12 and electric capacity DE2 of the operational amplifier IC1B it
Between node and audion Q4 colelctor electrode, between anti-phase input the terminating resistor R6 and R7 of the operational amplifier IC1B
Node, the anode of the power supply terminating diode D8 of operational amplifier IC1B, the outfan forward direction series connection two of operational amplifier IC1B
Pole pipe D4 connects the outfan SSR+ of circuit as time delay.
Advantageous Effects of the present utility model：
This utility model three-phase alternating current solid-state relay outfan connected two groups of conversion types magnetic keep after
Electrical equipment, completes the commutation work of three phase mains by magnetic latching relay, so realizes proper logic in power end
Interlocking, therefore regardless of external interference, three phase mains never forms phase fault loop, it is ensured that the length of module work
Phase reliability；The three-phase alternating current solid-state relay of inside modules is connected in time delay and completes to connect disjunction electricity under the auxiliary of circuit simultaneously
The work of machine load, so that magnetic latching relay will not produce spark in commutation process, therefore mould is greatly improved
The working life of block itself.
Description of the drawings
Schematic block circuit diagrams of the Fig. 1 for this utility model embodiment；
Three-phase alternating current solid-state relay circuit theory diagrams of the Fig. 2 for this utility model embodiment；
Fig. 3 connects circuit schematic diagram for the time delay of this utility model embodiment；
Magnetic latching relay control circuit schematic diagrams of the Fig. 4 for this utility model embodiment.
Specific embodiment
This utility model is further illustrated in conjunction with the drawings and specific embodiments.
As shown in figure 1, a kind of three phase alternating current motor rotating control module for possessing output interlocking function, including two groups turns
The twin coil magnetic latching relay 1 remodeled, 3 phase AC solid relay circuit 2 connect circuit 3, the twin coil magnetic with time delay
Guard relay 1 is connected between input L1, L2 of outfan U, V and three phase electric machine M of three phase mains, constitutes three phase electric machine M
Rotating power supply control loop, the twin coil of the twin coil magnetic latching relay 1 connects rotating forward control signal input F respectively
（Rotate forward）With reverse control signal input R（Reversion）Driving circuit is constituted, drives the switch of twin coil magnetic latching relay 1 complete
Into cut action, the 3 phase AC solid relay 2 is serially connected in input L1, L2, L3 of three phase electric machine M and twin coil magnetic is protected
Between the outfan W of the outfan and three phase mains of holding relay 1, the connecting and disconnecting of three phase electric machine M loads are realized, it is described
Rotate forward control signal input F（Rotate forward）With reverse control signal input R（Reversion）Intersected with three by delay turn-on circuit 3
The control signal connection of stream solid-state relay 2, the break-make of delay and running 3 phase AC solid relay 2.
Specifically, as shown in figure 4, the normally-closed contact and second switch of the first switch of twin coil magnetic latching relay K1
Normally opened contact meets the outfan U of three phase mains, and the normally-closed contact of the second switch of twin coil magnetic latching relay K1 and first is opened
The normally opened contact of pass meets the outfan V of three phase mains, and the one of the first coil and the second coil of twin coil magnetic latching relay K1
End connects rotating forward control signal input F respectively（Rotate forward）With reverse control signal input R（Reversion）, the other end is while series electrical
Resistance R27 ground connection.
As shown in Fig. 2 the 3 phase AC solid relay circuit includes photoelectrical coupler A1-A6 and three groups of controllable silicon moulds
Block SCRS1-SCRS3, the silicon controlled module SCRS1-SCRS3 are constituted by two one-way SCR parallel connected in reverse phase, the light
The input series connection of electric coupler A1 and A2 is followed by between the outfan SSR+ and ground that circuit 3 is connected in time delay, the smooth thermocouple
First control end of the latter termination silicon controlled module SCRS1 of outfan series connection of clutch A1 and A2, while series resistance R16 connects double
The common port EMR-U1 of the first switch of coil magnetic latching relay K1, other end series resistance R23 meet silicon controlled module SCRS1
The second control end, while series resistance R23 and R17 connect the first input end L1 of three phase electric machine M, the silicon controlled module
SCRS1 is connected on the first input end L1 of the first switch common port EMR-U1 and three phase electric machine M of twin coil magnetic latching relay K1
Between, the silicon controlled module SCRS1 is also in parallel with the resistance R25 and electric capacity C3 that connect, the photoelectrical coupler A3's and A4
Input series connection is followed by between the outfan SSR+ and ground that circuit 3 is connected in time delay, the output of the photoelectrical coupler A3 and A4
First control end of the latter termination silicon controlled module SCRS2 of end series connection, while series resistance R18 connects twin coil magnetic latching relay
The second switch common port EMR-V1 of K1, other end series resistance R22 connect second control end of silicon controlled module SCRS2, while
Series resistance R22 and R19 meet the second input L2 of three phase electric machine M, and the silicon controlled module SCRS2 is connected on the holding of twin coil magnetic
Between the second input L2 of the second switch common port EMR-V1 and three phase electric machine M of relay K1, the silicon controlled module
SCRS2 is also in parallel with the resistance R26 and electric capacity C4 that connect, and the input series connection for stating photoelectrical coupler A5 and A6 is followed by connecing in time delay
Between the outfan SSR+ of circuit passband 3 and ground, the latter termination controllable silicon mould of outfan series connection of the photoelectrical coupler A5 and A6
First control end of block SCRS3, while series resistance R20 meets the outfan W of three phase mains, other end series resistance R24 connects can
Second control end of control silicon module SCRS3, while series resistance R24 and R21 meet the 3rd input L3 of three phase electric machine M, it is described
Silicon controlled module SCRS3 is connected between the 3rd input L3 of outfan W and three phase electric machine M of three phase mains, the controllable silicon
Module SCRS3 is also in parallel with the resistance R28 and electric capacity C5 that connect.
As shown in figure 3, circuit 3 is connected in the time delay includes diode D1-D8, audion Q1-Q4, operational amplifier IC1A
With operational amplifier IC1B, rotating forward control signal input F（Rotate forward）Forward direction series diode D1 and D5 connects three poles successively
The base stage of pipe Q1, the base stage of the collector connecting transistor Q2 of the audion Q1, the grounded emitter of the audion Q1 and Q2,
The negative terminal of diode D1 is connected with the anode of diode D7, the negative terminal series capacitance E1 ground connection of diode D7, the base of audion Q2
Pole series resistance R9 connects the negative terminal of diode D7, and anode series resistance R4 of the diode D7 connects the defeated of operational amplifier IC1A
Go out end, while being sequentially connected in series resistance R2 and R3 ground connection and being sequentially connected in series resistance R11 and electric capacity DE1 ground connection, the operation amplifier
The colelctor electrode of node and audion Q2 between the homophase input terminating resistor R11 and electric capacity DE1 of device IC1A, the computing are put
Node between anti-phase input the terminating resistor R2 and R3 of big device IC1A, the power supply terminating diode D7's of operational amplifier IC1A
Anode, the outfan forward direction series diode D3 of operational amplifier IC1A connect the outfan SSR+ of circuit 3 as time delay, described
Forward direction series diode D2 and D6 connects the base stage of audion Q3, the audion to reverse control signal input R (reversion) successively
The base stage of the collector connecting transistor Q4 of Q3, the grounded emitter of the audion Q3 and Q4, the negative terminal of diode D2 and two poles
The anode connection of pipe D8, the negative terminal series capacitance E2 ground connection of diode D8, base series resistor R10 of audion Q4 connect diode
The negative terminal of D8, anode series resistance R8 of the diode D8 connect the outfan of operational amplifier IC1B, while being sequentially connected in series electricity
Resistance R6 and R7 is grounded and is sequentially connected in series resistance R12 and electric capacity DE2 ground connection, the homophase input termination of the operational amplifier IC1B
The colelctor electrode of node and audion Q4 between resistance R12 and electric capacity DE2, the inverting input of the operational amplifier IC1B
Node between connecting resistance R6 and R7, the anode of the power supply terminating diode D8 of operational amplifier IC1B, operational amplifier IC1B
Outfan forward direction series diode D4 as time delay connect circuit 3 outfan SSR+.
Rotate forward control signal and reverse control signal control twin coil magnetic latching relay K1 completes the commutation of three phase mains
Work, so realizes proper logical interlock in power end, therefore regardless of external interference, three phase mains is eternal
Phase fault loop will not be formed, it is ensured that the long-term reliability of module work；Control signal and reversion control letter are rotated forward simultaneously
Number three-phase alternating current solid-state relay 2 for connecting 3 delays time to control inside modules of circuit by time delay completes to connect disjunction motor M load
Work, so that twin coil magnetic latching relay K1 will not produce spark in commutation process, therefore be greatly improved
The working life of module itself.
Although specifically showing and describing this utility model with reference to preferred embodiment, those skilled in the art should
This is understood, in the spirit and scope of the present utility model limited without departing from appended claims, in form and details
On this utility model can be made a variety of changes, be protection domain of the present utility model.
Claims (3)
1. the three phase alternating current motor rotating control module of output interlocking function is possessed, it is characterised in that：Including two groups of conversion types
Twin coil magnetic latching relay, 3 phase AC solid relay circuit connect circuit with time delay, the twin coil magnetic keep after
Electrical equipment is connected between the input of outfan and three phase electric machine of three phase mains, and the rotating power supply control for constituting three phase electric machine is returned
Road, the twin coil of the twin coil magnetic latching relay connect rotating forward control signal input and reverse control signal input respectively
Driving circuit is constituted, the 3 phase AC solid relay is serially connected in the input and twin coil magnetic latching relay of three phase electric machine
Outfan between, realize three phase electric machine load connecting and disconnecting, the rotating forward control signal input and reversion control letter
Number input is connected with the control signal of 3 phase AC solid relay by delay turn-on circuit.
2. the three phase alternating current motor rotating control module for possessing output interlocking function according to claim 1, its feature
It is：The 3 phase AC solid relay circuit includes photoelectrical coupler A1-A6 and three groups of silicon controlled module SCRS1-
SCRS3, the silicon controlled module SCRS1-SCRS3 are constituted by two one-way SCR parallel connected in reverse phase, the photoelectrical coupler
The input series connection of A1 and A2 is followed by between the outfan SSR+ and ground that circuit is connected in time delay, the photoelectrical coupler A1 and A2
Outfan connect first control end of latter termination silicon controlled module SCRS1, while series resistance R16 connects twin coil magnetic keeping
The first switch common port EMR-U1 of relay, other end series resistance R23 connect second control end of silicon controlled module SCRS1,
Series resistance R23 and R17 meet the first input end L1 of three phase electric machine simultaneously, and the silicon controlled module SCRS1 is connected on twin coil magnetic
Between the first input end L1 of the first switch common port EMR-U1 and three phase electric machine of guard relay, the silicon controlled module
SCRS1 is also in parallel with the resistance R25 and electric capacity C3 that connect, and the input series connection of the photoelectrical coupler A3 and A4 is followed by time delay
Connect between the outfan SSR+ and ground of circuit, the latter termination controllable silicon mould of outfan series connection of the photoelectrical coupler A3 and A4
First control end of block SCRS2, while series resistance R18 meets the second switch common port EMR- of twin coil magnetic latching relay
V1, other end series resistance R22 connect second control end of silicon controlled module SCRS2, while series resistance R22 and R19 connect three-phase
Second input L2 of motor, the silicon controlled module SCRS2 are connected on the second switch common port of twin coil magnetic latching relay
Between EMR-V1 and the second input L2 of three phase electric machine, the silicon controlled module SCRS2 also with the resistance R26 and electric capacity for connecting
C4 is in parallel, and the photoelectrical coupler A5 is followed by connecting the outfan SSR+'s and ground of circuit in time delay with the input series connection of A6
Between, first control end of the latter termination silicon controlled module SCRS3 of outfan series connection of the photoelectrical coupler A5 and A6, while string
Connection resistance R20 meets an outfan W of three phase mains, and other end series resistance R24 connects second control of silicon controlled module SCRS3
End, while series resistance R24 and R21 meet the 3rd input L3 of three phase electric machine, the silicon controlled module SCRS3 is connected on three-phase electricity
Between the one outfan W and the 3rd input L3 of three phase electric machine in source, the silicon controlled module SCRS3 also with the resistance connected
R28 and electric capacity C5 are in parallel.
3. the three phase alternating current motor rotating control module for possessing output interlocking function according to claim 1, its feature
It is：Circuit is connected in the time delay includes diode D1-D8, audion Q1-Q4, operational amplifier IC1A and operational amplifier
IC1B, forward direction series diode D1 and D5 connects the base stage of audion Q1, three pole to the rotating forward control signal input successively
The base stage of the collector connecting transistor Q2 of pipe Q1, the grounded emitter of the audion Q1 and Q2, the negative terminal of diode D1 and two
The anode connection of pole pipe D7, the negative terminal series capacitance E1 ground connection of diode D7, base series resistor R9 of audion Q2 connect two poles
The negative terminal of pipe D7, anode series resistance R4 of the diode D7 connect the outfan of operational amplifier IC1A, while being sequentially connected in series
Resistance R2 and R3 are grounded and are sequentially connected in series resistance R11 and electric capacity DE1 ground connection, the in-phase input end of the operational amplifier IC1A
The colelctor electrode of node and audion Q2 between connecting resistance R11 and electric capacity DE1, the anti-phase input of the operational amplifier IC1A
Node between terminating resistor R2 and R3, the anode of the power supply terminating diode D7 of operational amplifier IC1A, operational amplifier
The outfan forward direction series diode D3 of IC1A connects the outfan SSR+ of circuit, the reverse control signal input as time delay
Forward direction series diode D2 and D6 successively is held to connect the base stage of audion Q3, the base of the collector connecting transistor Q4 of the audion Q3
Pole, the grounded emitter of the audion Q3 and Q4, the negative terminal of diode D2 are connected with the anode of diode D8, diode D8's
Negative terminal series capacitance E2 is grounded, and base series resistor R10 of audion Q4 connects the negative terminal of diode D8, and the diode D8 is just
End series resistance R8 connects the outfan of operational amplifier IC1B, while being sequentially connected in series resistance R6 and R7 ground connection and being sequentially connected in series electricity
Resistance R12 and electric capacity DE2 ground connection, the node between the homophase input terminating resistor R12 and electric capacity DE2 of the operational amplifier IC1B
And the colelctor electrode of audion Q4, the node between anti-phase input the terminating resistor R6 and R7 of the operational amplifier IC1B, fortune
The anode of the power supply terminating diode D8 of amplifier IC1B is calculated, the outfan forward direction series diode D4 of operational amplifier IC1B makees
The outfan SSR+ of circuit is connected for time delay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621023394.3U CN206060611U (en) | 2016-08-31 | 2016-08-31 | Possesses the three phase alternating current motor rotating control module of output interlocking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621023394.3U CN206060611U (en) | 2016-08-31 | 2016-08-31 | Possesses the three phase alternating current motor rotating control module of output interlocking function |
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| CN206060611U true CN206060611U (en) | 2017-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621023394.3U Active CN206060611U (en) | 2016-08-31 | 2016-08-31 | Possesses the three phase alternating current motor rotating control module of output interlocking function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107610979A (en) * | 2017-10-24 | 2018-01-19 | 金陵科技学院 | A kind of elevating lever based on Control |
| CN107659140A (en) * | 2017-09-19 | 2018-02-02 | 杭州可靠性仪器厂 | A kind of method of be delayed isolation and amplifier device and its elimination spike |
| CN108953207A (en) * | 2018-07-27 | 2018-12-07 | 廊坊市骏成消防技术咨询服务有限公司 | A kind of blower reversal protection control device |
| CN111697902A (en) * | 2020-06-23 | 2020-09-22 | 温州大学 | Three-phase motor control circuit based on relay |
| CN113612427A (en) * | 2021-07-30 | 2021-11-05 | 北京曙光航空电气有限责任公司 | Linear actuator control circuit |
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2016
- 2016-08-31 CN CN201621023394.3U patent/CN206060611U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107659140A (en) * | 2017-09-19 | 2018-02-02 | 杭州可靠性仪器厂 | A kind of method of be delayed isolation and amplifier device and its elimination spike |
| CN107659140B (en) * | 2017-09-19 | 2024-04-02 | 浙江杭可仪器有限公司 | Delay isolation output device and spike eliminating method thereof |
| CN107610979A (en) * | 2017-10-24 | 2018-01-19 | 金陵科技学院 | A kind of elevating lever based on Control |
| CN108953207A (en) * | 2018-07-27 | 2018-12-07 | 廊坊市骏成消防技术咨询服务有限公司 | A kind of blower reversal protection control device |
| CN108953207B (en) * | 2018-07-27 | 2021-01-22 | 廊坊市骏成消防技术咨询服务有限公司 | Fan reversal protection control device |
| CN111697902A (en) * | 2020-06-23 | 2020-09-22 | 温州大学 | Three-phase motor control circuit based on relay |
| CN113612427A (en) * | 2021-07-30 | 2021-11-05 | 北京曙光航空电气有限责任公司 | Linear actuator control circuit |
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