CN102868332B - Star delta closed type change-over starting device protected by microcomputer - Google Patents
Star delta closed type change-over starting device protected by microcomputer Download PDFInfo
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- CN102868332B CN102868332B CN201210338218.9A CN201210338218A CN102868332B CN 102868332 B CN102868332 B CN 102868332B CN 201210338218 A CN201210338218 A CN 201210338218A CN 102868332 B CN102868332 B CN 102868332B
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Abstract
The invention relates to a star delta closed type change-over starting device protected by a microcomputer, and belongs to the technical field of starting protection of a motor. The star delta closed type change-over starting device comprises a power converting protection circuit, a fault detecting circuit, a transition protection circuit, an execution circuit and a microcontroller U, wherein an input end of the power converting protection circuit is connected with an incoming line of a power source, an output end of the power converting protection circuit is connected with the execution circuit and the microcontroller U, the execution circuit is externally connected with the incoming line of the power source, and is connected with the fault detecting circuit, the transition protection circuit and the microcontroller U, the fault detecting circuit is connected with the transition protection circuit and the microcontroller U, and an output end of the transition protection circuit is connected with an outgoing line terminal of a motor M. The star delta closed type change-over starting device protected by the microcomputer disclosed by the invention has the advantages that a contactor and a circuit breaker are protected, the service life of the contactor and the circuit breaker is prolonged, the impact of a secondary impact current on a power grid can be reduced, and the starting protection and the safe use of the motor are realized.
Description
Technical field
the invention belongs to the starting protection technical field of motor, be specifically related to a kind of star triangle enclosed changing-over starting drive of Microcomputer Protection.
Background technology
asynchronous machine, is also called induction machine, and the kind according to alternating current used is divided into monophase machine and three phase electric machine.Monophase machine is used for as the electrical equipment such as washing machine, electric fan; Three phase electric machine is then as the power-equipment of factory, mansion.Asynchronous machine is because its structure is simple, low price, high reliability are widely used, but starting current is larger in start-up course.Therefore, in the prior art, the startup of the startup of motor, particularly high-power, large-size machine, usually all adopt the changing-over of star triangle to start, this is one reduced-voltage starting mode simply and easily, by manually and the realization of automatic operation control mode.Overload adopts thermal relay protection, and starting current may be limited to less than 3 times of rated current, and its maximum advantage is that circuit is simple; Shortcoming belongs to non-closed loop changing-over, control precision extreme difference, can produce very large secondary pulse electric current, and protective circuit breaker can be made under limiting condition to occur that instantaneous protection trips.In addition; thermal relay protection precision is not high; sensitive not to the phase shortage of motor, the mutually fault detect of imbalance, overvoltage, stall, zero-sequence current etc.; often cause motor to stop steathily, affect production; increase maintenance cost; simultaneously on also having great impact the useful life of motor, power transformer and contactor, larger to the impulse ratio of electrical network.
along with the quickening of rhythm of production, the maximization of production equipment, the power of institute's adapted motor is also increasing, and the monitoring run motor is also more and more important with protection.The application of Microcomputer Protection, improves the reliability to electric motor protecting and accuracy greatly, and the technology that the integrated protection for motor provides many GPF (General Protection Falses to complete and function, have the technology not available for conventional relaying protection and function.
can for this reason, provide one to belong to enclosed changing-over, the motor starting device carrying out starting protection by microcomputer be again that industry has problem to be solved.
Summary of the invention
the object of this invention is to provide a kind of star triangle enclosed changing-over starting drive of Microcomputer Protection; belong to enclosed changing-over, by startup, the changing-over of microcomputer controlled electro machine, and provide the fault detect of electric current, voltage, zero-sequence current; for realizing starting protection and the safe handling of motor, intelligent level is high.
the object of the invention is to reach like this, a kind of star triangle enclosed changing-over starting drive of Microcomputer Protection, comprise Power convert protective circuit, failure detector circuit, over current protection circuit, executive circuit and microcontroller U, the input termination electric power incoming line of Power convert protective circuit, output is connected with executive circuit and microcontroller U, executive circuit external power supply inlet wire and and failure detector circuit, over current protection circuit and microcontroller U connect, failure detector circuit is connected with over current protection circuit and microcontroller U, the outlet terminal of the output termination motor M of over current protection circuit.
in a specific embodiment of the present invention, described Power convert protective circuit comprises Control protection switch CB1 ~ CB4 and step-down transformer CPT, two inputs of Control protection switch CB1 meet the 3rd output and the electric power incoming line N of the normally-closed contact of the incoming relay-protection circuit breaker MCCB in executive circuit respectively, two outputs of Control protection switch CB1 are connected with wire K11 and wire K12 respectively, wire K11, K12 is connected with executive circuit, three inputs of Control protection switch CB2 respectively with electric power incoming line L1, L2, L3 connects, the L1 of three outputs of Control protection switch CB2 and the J3 part of microcontroller U, L2, L3 pin connects, two inputs of Control protection switch CB3 meet electric power incoming line L2 respectively, L3, two of Control protection switch CB3 exports BK1 end and the BK2 end of termination step-down transformer CPT, the BK3 end of step-down transformer CPT is connected with two inputs of Control protection switch CB4 with BK4 end, two outputs of Control protection switch CB4 are connected with wire K13 and wire K14 respectively, wire K13 connects executive circuit, wire K14 meets microcontroller U.
in another specific embodiment of the present invention, described failure detector circuit comprises Current Transmit 1 ~ CT6, two secondary S1 of Current Transmit 1, S2 connects 1 of the J4 part of microcontroller U respectively, 2 pin, two secondary S1 of Current Transmit 2, S2 connects 3 of the J4 part of microcontroller U respectively, 4 pin, two secondary S1 of Current Transmit 3, S2 connects 5 of the J4 part of microcontroller U respectively, 6 pin, two secondary S1 of Current Transmit 4, S2 connects 5 of the J5 part of microcontroller U respectively, 6 pin, two secondary S1 of Current Transmit 5, S2 connects 1 of the J5 part of microcontroller U respectively, 2 pin, two secondary S1 of Current Transmit 6, S2 connects 3 of the J5 part of microcontroller U respectively, 4 pin, described failure detector circuit is by wire K1, K4, K7 is connected with executive circuit, be connected with over current protection circuit by wire K1 ~ K9.
in another specific embodiment of the present invention, described over current protection circuit comprises resistance R1 ~ R3, first of star contact S often opens main contacts, second often opens main contacts, 3rd often opens main contacts, first of starting contactor 1M often leaves main contacts, second often opens main contacts, 3rd often opens main contacts, first of changing-over contactor 1A often opens main contacts, second often opens main contacts, 3rd often opens main contacts often opens main contacts with run contactor 2M first, second often opens main contacts, 3rd often opens main contacts, first of starting contactor 1M often leaves one end of main contacts, first one end of often opening main contacts of one end and operation contactor 2M that first of changing-over contactor 1A often opens main contacts is connected with wire K1, wire K1 is connected with the first output of the normally-closed contact of the incoming relay-protection circuit breaker MCCB in described executive circuit through after the Current Transmit 1 in described failure detector circuit, first of starting contactor 1M often leaves another terminated wires K2 of main contacts, wire K2 is through the outlet terminal T1 connecing motor M after the Current Transmit 5 in failure detector circuit, first of changing-over contactor 1A often opens one end of the other end connecting resistance R1 of main contacts, the other end of resistance R1, run first of contactor 2M often to open one end that the other end of main contacts and first of star contact S often open main contacts and be connected with wire K3, wire K3 is connected with the outlet terminal T6 of motor M through after the Current Transmit 4 in failure detector circuit, second of starting contactor 1M often leaves one end of main contacts, second one end of often opening main contacts of one end and operation contactor 2M that second of changing-over contactor 1A often opens main contacts is connected with wire K4, wire K4 is connected with the second output of the normally-closed contact of the incoming relay-protection circuit breaker MCCB in executive circuit through after the Current Transmit 2 in failure detector circuit, second of starting contactor 1M often leaves another terminated wires K5 of main contacts, wire K5 is through the outlet terminal T2 connecing motor M after the Current Transmit 6 in failure detector circuit, second of changing-over contactor 1A often opens one end of the other end connecting resistance R2 of main contacts, the other end of resistance R2, run second of contactor 2M often to open one end that the other end of main contacts and second of star contact S often open main contacts and be connected with wire K6, wire K6 is connected with the outlet terminal T4 of motor M through after the Current Transmit 5 in failure detector circuit, the 3rd of starting contactor 1M often leaves one end of main contacts, 3rd one end of often opening main contacts of one end and operation contactor 2M that the 3rd of changing-over contactor 1A often opens main contacts is connected with wire K7, wire K7 is connected with the 3rd output of the normally-closed contact of the incoming relay-protection circuit breaker MCCB in executive circuit through after the Current Transmit 3 in failure detector circuit, the 3rd of starting contactor 1M often leaves another terminated wires K8 of main contacts, wire K8 is through the outlet terminal T3 connecing motor M after the Current Transmit 4 in failure detector circuit, the 3rd of changing-over contactor 1A often opens one end of the other end connecting resistance R3 of main contacts, the other end of resistance R3, run the 3rd of contactor 2M often to open one end that the other end of main contacts and the 3rd of star contact S often open main contacts and be connected with wire K9, wire K9 is connected with the outlet terminal T5 of motor M through after the Current Transmit 6 in failure detector circuit, the 3rd other end often opening main contacts that first of star contact S often opens the other end and star contact S that the other end of main contacts often opens main contacts with second of star contact S is connected.
in another specific embodiment of the present invention, described executive circuit comprises incoming relay-protection circuit breaker MCCB, relay CR1, relay PR1 ~ PR4, star contact S, starting contactor 1M, changing-over contactor 1A and operation contactor 2M, three inputs of the normally-closed contact of described incoming relay-protection circuit breaker MCCB respectively with electric power incoming line L1, L2, L3 connects, one end of the shunt opening coil F of incoming relay-protection circuit breaker MCCB is connected with one end of the normally opened contact of relay CR1, the other end of the normally opened contact of relay CR1 is connected with wire K11, the other end of the shunt opening coil F of incoming relay-protection circuit breaker MCCB is connected with wire K12, 6 pin of the J9 part of one termination microcontroller U of the coil of relay CR1, one end of the other end of the coil of relay CR1 and the coil of relay PR3, one end of the coil of relay PR1, one end of one end of the coil of relay PR4 and the coil of relay PR2 meets wire K13 jointly, the other end of the coil of relay PR3 is connected with one end of the normally closed auxiliary contact of changing-over contactor 1A, the other end of the normally closed auxiliary contact of changing-over contactor 1A is connected with the one end of the first normally closed auxiliary contact running contactor 2M, J9 2 pin partly of microcontroller U are connected to after second one end of often driving auxiliary contact of the other end of the first normally closed auxiliary contact running contactor 2M and one end of often driving auxiliary contact of star contact S and starting contactor 1M is connected, the other end that the other end often driving auxiliary contact of star contact S and second of starting contactor 1M often opens the other end of auxiliary contact and the coil of relay PR1 is connected, one end of the normally opened contact of relay PR3, one end of the normally opened contact of relay PR1, one end of one end of the normally opened contact of relay PR4 and the normally opened contact of relay PR2 meets wire K11 jointly, one end of the coil of another termination star contact S of the normally opened contact of relay PR3, one end of the other end of the coil of star contact S and the coil of starting contactor 1M, one end of one end of the coil of changing-over contactor 1A and the coil of operation contactor 2M meets wire K12 jointly, the other end of the normally opened contact of the other end contact relay PR1 of the coil of starting contactor 1M, the other end of the normally opened contact of the other end contact relay PR4 of the coil of changing-over contactor 1A, the other end running the coil of contactor 2M is connected with the other end of the normally opened contact of relay PR2, another termination of the coil of relay PR4 runs one end of second normally closed auxiliary contact of contactor 2M, one end that the other end and second running second normally closed auxiliary contact of contactor 2M often opens one end of auxiliary contact and the normally closed auxiliary contact of star contact S is connected and is connected with J9 4 pin partly of microcontroller U afterwards, second other end often driving auxiliary contact running contactor 2M is connected with the other end of one end of often driving auxiliary contact of changing-over contactor 1A and the coil of relay PR2, the other end often opening the normally closed auxiliary contact of another termination star contact S of auxiliary contact of changing-over contactor 1A, first of starting contactor 1M often leaves 9 pin of the J2 part of a termination microcontroller U of auxiliary contact, first of starting contactor 1M often leaves 10 pin of the J2 part of another termination microcontroller U of auxiliary contact, run 11 pin that first of contactor 2M often leaves the J2 part of a termination microcontroller U of auxiliary contact, run 12 pin that first of contactor 2M often leaves the J2 part of another termination microcontroller U of auxiliary contact.
also have in a specific embodiment of the present invention, described microcontroller U, 1 pin of J1 part, 1,3,5,15 pin of J9 part meet wire K14 jointly, 2 pin of J1 part meet wire K13,16 pin output alarm signals of J9 part, 1 pin of J2 part is connected with 2 pin, 7 pin are connected with 8 pin, 5 pin of J2 part and the start-stop signal of the external motor M of 6 pin.
the present invention is owing to have employed said structure, over current protection circuit is utilized to carry out closed circuit changing-over, and reduce the impact to contactor and lead-in circuit breaker of secondary pulse electric current that the changing-over of star triangle produces instantaneously, the effect played protection and extend contactor and circuit breaker useful life, and the impact of secondary pulse Current on Grid can be reduced; In addition, by microcontroller U, voltage, electric current and leakage current are sampled, provide the detection of voltage, electric current and leakage current fault to protect to motor, thus achieve starting protection and the safe handling of motor.
Accompanying drawing explanation
fig. 1 is theory diagram of the present invention.
fig. 2 is electrical schematic diagram of the present invention.
Embodiment
technical spirit of the present invention and beneficial effect can be fully understood in order to make the public; applicant will describe in detail the specific embodiment of the present invention below by reference to the accompanying drawings; but applicant is not the restriction to technical scheme to the description of embodiment, any changing in the form rather than substance according to the present invention's design all should be considered as protection scope of the present invention.
refer to Fig. 1, a kind of star triangle enclosed changing-over starting drive of Microcomputer Protection, comprise Power convert protective circuit 1, failure detector circuit 2, over current protection circuit 3, executive circuit 4 and microcontroller U, the input termination electric power incoming line of Power convert protective circuit 1, output is connected with executive circuit 4 and microcontroller U, executive circuit 4 external power supply inlet wire and with failure detector circuit 2, over current protection circuit 3 and microcontroller U connect, failure detector circuit 2 is connected with over current protection circuit 3 and microcontroller U, the outlet terminal of the output termination motor M of over current protection circuit 3.
refer to Fig. 2, specifically, described Power convert protective circuit 1 comprises Control protection switch CB1 ~ CB4 and step-down transformer CPT, and in the present embodiment, described step-down transformer CPT adopts BK-3000.Described failure detector circuit 2 comprises Current Transmit 1 ~ CT6, and in the present embodiment, described Current Transmit 1 ~ CT6 is LMZ3-0.66/3.Described over current protection circuit 3 comprises resistance R1 ~ R3, first of star contact S often opens main contacts, second often opens main contacts, 3rd often opens main contacts, first of starting contactor 1M often leaves main contacts, second often opens main contacts, 3rd often opens main contacts, first of changing-over contactor 1A often opens main contacts, second often opens main contacts, 3rd often opens main contacts often opens main contacts with run contactor 2M first, second often opens main contacts, 3rd often opens main contacts, in the present embodiment, the resistance of resistance R1 ~ R3 is very little, generally be not more than 1 Ω, their conduction time is very short, no longer than 1 second.Resistance R1 ~ R3 plays closed circuit changing-over herein, allows stator winding not throw off with power supply in whole start-up course, remains the connection with electrical network, reduces the impact of star triangle changing-over moment secondary pulse electric current to contactor and lead-in circuit breaker.Described over current protection circuit 3 is connected with outlet terminal T1, T6, T2, T4, T3, T5 of motor M respectively by wire K2, wire K3, wire K5, wire K6, wire K8 and wire K9.Described executive circuit 4 comprises incoming relay-protection circuit breaker MCCB, relay CR1, relay PR1 ~ PR4, star contact S, starting contactor 1M, changing-over contactor 1A and runs contactor 2M; in the present embodiment; described incoming relay-protection circuit breaker MCCB adopts NF-1000SEW; described star contact S adopts LC1-D410; starting contactor 1M and operation contactor 2M adopts LC1-D620, changing-over contactor 1A to adopt LC1-D300.Core devices of the present invention is microcontroller U, and described microcontroller U adopts the ISM of U.S.'s Carrier.
below, composition graphs 2 again, is described operation principle of the present invention.Outside start stop signal accesses this starting drive via 5,6 pin of the J2 part of microcontroller U, when microcontroller U receives enabling signal, 2 pin of the J9 part of microcontroller U export enabling signal, normally closed auxiliary contact successively through the first normally closed auxiliary contact and changing-over contactor 1A that run contactor 2M makes relay PR3 coil obtain electric closing, star contact S coil obtains electric closed, relay PR1 coil obtains electric closed, starting contactor 1M coil obtains electric, often open main contacts and close for three of starting contactor 1M, motor M starts star and connects startup.Rise etc. the rotor speed of motor M, when the winding current of motor M drops to and is greater than 15% and is less than the rated current of 100%, 4 pin of the J9 part of microcontroller U export switching wave, via the second normally closed auxiliary contact running contactor 2M, relay PR4 coil is obtained electric closed, changing-over contactor 1A coil obtains electric, often open main contacts and close for three of changing-over contactor 1A, the three winding of motor M respectively with resistance R1, R2, R3 and couple stars connect.Meanwhile, the normally closed auxiliary contact of changing-over contactor 1A disconnects, and relay PR3 coil losing electricity disconnects, star contact S coil losing electricity, often open main contacts and disconnect for three of star contact S, the three winding of motor M is connected with resistance R1, R2, R3 respectively, realizes step-down corner connection and runs.Star contact S coil losing electricity, normally closed auxiliary contact closes, and relay PR2 coil obtains electric, running contactor 2M coil obtains electric, relay PR4 coil losing electricity, changing-over contactor 1A coil losing electricity, often open main contacts and disconnect, the winding total head corner connection of motor M is run for three of changing-over contactor 1A.
in addition, the J3 part of microcontroller U carries out voltage signal sampling, provides phase shortage, anti-phase, overvoltage, under voltage detection to motor M; J4 part carries out the sampling of current signal, provides overload, stall, mutually detection that is uneven, not exclusively changing-over fault to motor M; In addition, microcontroller U also carries out zero-sequence current sampling by J5 part, carries out detection of electrical leakage to motor M.Example; when motor M generation stall; 6 pin output signals of the J9 part of microcontroller U; the coil of relay CR1 obtains electric; normally opened contact closes, and the shunt opening coil F of incoming relay-protection circuit breaker MCCB obtains electric dropout, and electric power incoming line is disconnected; motor M shuts down, simultaneously 16 pin output alarm signals of the J9 part of microcontroller U.During other voltages, current failure beyond motor M generation stall, 2,4 pin no-outputs of the J9 part of microcontroller U, motor M stops, simultaneously 16 pin output alarm signals of the J9 part of microcontroller U.Described microcontroller U also provides the translation and protection of motor M by J2 9,10,11,12 pin partly.When starting-up later time breaks down, starting contactor 1M not electric time, first of starting contactor 1M often leaves auxiliary contact and disconnects, 2 pin no-outputs of the J9 of microcontroller U part, and motor M stops, simultaneously 16 pin output alarm signals of the J9 part of microcontroller U; When the incomplete changing-over of motor M, run contactor 2M not electric time, run first of contactor 2M and often drive auxiliary contact and disconnect, 2,4 pin no-outputs of the J9 part of microcontroller U, motor M stops, simultaneously the J9 16 pin output alarm signals partly of microcontroller U.
Claims (1)
1.
a kind of star triangle enclosed changing-over starting drive of Microcomputer Protection, it is characterized in that comprising Power convert protective circuit (1), failure detector circuit (2), over current protection circuit (3), executive circuit (4) and microcontroller U, the input termination electric power incoming line of Power convert protective circuit (1), output is connected with executive circuit (4) and microcontroller U, executive circuit (4) external power supply inlet wire and with failure detector circuit (2), over current protection circuit (3) and microcontroller U connect, failure detector circuit (2) is connected with over current protection circuit (3) and microcontroller U, the outlet terminal of the output termination motor M of over current protection circuit (3), described over current protection circuit (3) comprises resistance R1 ~ R3, first of star contact S often opens main contacts, second often opens main contacts, 3rd often opens main contacts, first of starting contactor 1M often leaves main contacts, second often opens main contacts, 3rd often opens main contacts, first of changing-over contactor 1A often opens main contacts, second often opens main contacts, 3rd often opens main contacts often opens main contacts with run contactor 2M first, second often opens main contacts, 3rd often opens main contacts, first of starting contactor 1M often leaves one end of main contacts, first one end of often opening main contacts of one end and operation contactor 2M that first of changing-over contactor 1A often opens main contacts is connected with wire K1, wire K1 is connected with the first output of the normally-closed contact of the incoming relay-protection circuit breaker MCCB in described executive circuit (4) through after the Current Transmit 1 in described failure detector circuit (2), first of starting contactor 1M often leaves another terminated wires K2 of main contacts, wire K2 is through the outlet terminal T1 connecing motor M after the Current Transmit 5 in failure detector circuit (2), first of changing-over contactor 1A often opens one end of the other end connecting resistance R1 of main contacts, the other end of resistance R1, run first of contactor 2M often to open one end that the other end of main contacts and first of star contact S often open main contacts and be connected with wire K3, wire K3 is connected with the outlet terminal T6 of motor M through after the Current Transmit 4 in failure detector circuit (2), second of starting contactor 1M often leaves one end of main contacts, second one end of often opening main contacts of one end and operation contactor 2M that second of changing-over contactor 1A often opens main contacts is connected with wire K4, wire K4 is connected with the second output of the normally-closed contact of the incoming relay-protection circuit breaker MCCB in executive circuit (4) through after the Current Transmit 2 in failure detector circuit (2), second of starting contactor 1M often leaves another terminated wires K5 of main contacts, wire K5 is through the outlet terminal T2 connecing motor M after the Current Transmit 6 in failure detector circuit (2), second of changing-over contactor 1A often opens one end of the other end connecting resistance R2 of main contacts, the other end of resistance R2, run second of contactor 2M often to open one end that the other end of main contacts and second of star contact S often open main contacts and be connected with wire K6, wire K6 is connected with the outlet terminal T4 of motor M through after the Current Transmit 5 in failure detector circuit (2), the 3rd of starting contactor 1M often leaves one end of main contacts, 3rd one end of often opening main contacts of one end and operation contactor 2M that the 3rd of changing-over contactor 1A often opens main contacts is connected with wire K7, wire K7 is connected with the 3rd output of the normally-closed contact of the incoming relay-protection circuit breaker MCCB in executive circuit (4) through after the Current Transmit 3 in failure detector circuit (2), the 3rd of starting contactor 1M often leaves another terminated wires K8 of main contacts, wire K8 is through the outlet terminal T3 connecing motor M after the Current Transmit 4 in failure detector circuit (2), the 3rd of changing-over contactor 1A often opens one end of the other end connecting resistance R3 of main contacts, the other end of resistance R3, run the 3rd of contactor 2M often to open one end that the other end of main contacts and the 3rd of star contact S often open main contacts and be connected with wire K9, wire K9 is connected with the outlet terminal T5 of motor M through after the Current Transmit 6 in failure detector circuit (2), the 3rd other end often opening main contacts that first of star contact S often opens the other end and star contact S that the other end of main contacts often opens main contacts with second of star contact S is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210338218.9A CN102868332B (en) | 2012-09-13 | 2012-09-13 | Star delta closed type change-over starting device protected by microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210338218.9A CN102868332B (en) | 2012-09-13 | 2012-09-13 | Star delta closed type change-over starting device protected by microcomputer |
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| Publication Number | Publication Date |
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| CN102868332A CN102868332A (en) | 2013-01-09 |
| CN102868332B true CN102868332B (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210338218.9A Active CN102868332B (en) | 2012-09-13 | 2012-09-13 | Star delta closed type change-over starting device protected by microcomputer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043433U (en) * | 1988-06-19 | 1989-08-23 | 阳晓知 | Multifunctional power-saving protector for motor |
| CN2123836U (en) * | 1991-12-06 | 1992-12-02 | 陈正中 | Closed circuit converting star-threeangle stator |
| CN2509774Y (en) * | 2001-11-05 | 2002-09-04 | 朱福奶 | Star-delta motor starter |
| CN2593462Y (en) * | 2002-11-21 | 2003-12-17 | 上海采矿机械厂 | Motor start circuit of closed star-delta conversion |
| CN101867335A (en) * | 2010-07-14 | 2010-10-20 | 蔡甫寒 | Star/triangle conversion energy-saving protector of digital readout electromotor |
-
2012
- 2012-09-13 CN CN201210338218.9A patent/CN102868332B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043433U (en) * | 1988-06-19 | 1989-08-23 | 阳晓知 | Multifunctional power-saving protector for motor |
| CN2123836U (en) * | 1991-12-06 | 1992-12-02 | 陈正中 | Closed circuit converting star-threeangle stator |
| CN2509774Y (en) * | 2001-11-05 | 2002-09-04 | 朱福奶 | Star-delta motor starter |
| CN2593462Y (en) * | 2002-11-21 | 2003-12-17 | 上海采矿机械厂 | Motor start circuit of closed star-delta conversion |
| CN101867335A (en) * | 2010-07-14 | 2010-10-20 | 蔡甫寒 | Star/triangle conversion energy-saving protector of digital readout electromotor |
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| CN102868332A (en) | 2013-01-09 |
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