Star-triangle automatic switching controller of motor

Abstract

The invention relates to the field of electromechanical switches, in particular to a star-delta starting circuit system of a motor, which consists of a plurality of groups of contactors, and is characterized in that a star-delta automatic switching controller of the motor consists of an electromagnet, a primary conductive frame, a delay oil cylinder and a reversing conductive frame, a wire inlet end is arranged at the front end outside the outer shell, an output end and an electromagnet wiring end are arranged at the rear end of the outer shell, an electromagnet is arranged at the front end inside the outer shell, a movable iron core at the rear end of the electromagnet is connected with a primary conductive frame, a delay oil cylinder is arranged at the rear end of the primary conductive frame, and a main spring is arranged between the primary conductive frame and a lower piston inside the delay oil cylinder. A time-delay oil cylinder is arranged in the outer shell, an upper piston in the time-delay oil cylinder is connected with a reversing conductive frame supporting frame, a reversing conductive frame is installed in the reversing conductive frame supporting frame, and a reset spring is arranged between the rear end of the reversing conductive frame supporting frame and the outer shell. And the working procedure of voltage reduction starting of the motor is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electromechanical switch, especially a motor star-delta starting circuit system composed of multiple contactor groups. BACKGROUND

[0002] The current of large industrial motor increases sharply when starting, which can cause the short-term load of power grid to increase, resulting in starting difficulty and other defects, and even burn the power grid. In order to reduce the starting current of the motor, the star-delta connection starting mode is usually used to protect the motor and the power grid. The traditional star-delta starting circuit is composed of three groups of AC contactors and a time relay. When working, the time relay is used to control the mutual on-off of the three groups of AC contactors to realize the conversion of star-delta connection mode. However, this device has serious defects. When one of the AC contactors or the time relay fails, the circuit cannot automatically convert, and the instantaneous delta supply or long-term star supply can cause serious damage to the motor, and even burn the circuit and the motor. The traditional star-delta circuit device involves many components, and it is difficult to ensure that each independent AC contactor and time relay can stably operate, so the failure rate is very high. In addition, the four independent components are expensive, which increases the procurement cost of the equipment. SUMMARY

[0003] In order to solve the above problems, the present application provides a star-delta automatic conversion controller for motor, which is composed of a shell body, an electromagnet, a primary conductive frame, a delay oil cylinder and a reversing conductive frame. The front end of the shell body is provided with L1 incoming line end, L2 incoming line end and L3 incoming line end. The rear end of the shell body is provided with W2 output end, U2 output end, V2 output end, U1 output end, V1 output end, W1 output end and electromagnet connection end. The front end of the shell body is provided with an electromagnet. The moving iron core at the rear end of the electromagnet is connected with the primary conductive frame. The rear end of the primary conductive frame is provided with a delay oil cylinder. The main spring is arranged between the primary conductive frame and the lower piston in the delay oil cylinder. The upper piston in the delay oil cylinder is connected with the reversing conductive frame support frame. The reversing conductive frame is installed in the reversing conductive frame support frame. The rear end of the reversing conductive frame support frame is provided with a reset spring. BRIEF DESCRIPTION OF DRAWINGS

[0004] The present application will be further explained in detail below with reference to the accompanying drawings.

[0005] Figure 1 It is an external structure diagram of the device.

[0006] Figure 2 It is an internal structure diagram of the device.

[0007] Figure 3This is a schematic diagram of the commutation conductor frame structure of the device.

[0008] Figure 4 This is a cross-sectional view of the device.

[0009] Figure 5 , Figure 6 This is a schematic diagram of the operating structure of the device.

[0010] Since sectional views cannot show multiple end faces on the same plane, the accompanying description... Figure 4 , Figure 5 as well as Figure 6 The L1 input terminal, W2 output terminal, and U1 output terminal are described in detail. Detailed Implementation

[0011] pass Figure 1 As can be seen, the device consists of an outer casing 1 and a panel 2. The front end of the outer casing 1 is provided with an AC input terminal 3 and an electromagnet terminal 10. The AC input terminal is used to provide 380V three-phase AC power to the device, and the electromagnet terminal is used to power the electromagnet inside the device. The rear end of the outer casing is provided with W2 output terminal 4, U2 output terminal 5, V2 output terminal 6, U1 output terminal 7, V1 output terminal 8 and W1 output terminal 9, which are used to connect to the six terminals of the motor. The middle of the panel 2 is provided with a delay adjustment valve 11, which is used to adjust the delay time of the device.

[0012] pass Figure 2It can be seen that the front end of the outer shell 1 is provided with an electromagnet 12, the moving core 13 at the rear end of the electromagnet is connected with the primary conductive frame 14, the primary conductive frame 14 is driven to move when the electromagnet 12 is powered, the primary conductive frame is provided with three groups of primary bridge type conductive sheets 15, the AC incoming line end is composed of L1 incoming line end 16, L2 incoming line end 17 and L3 incoming line end 18, the outer side end of the three groups of incoming line ends is connected with the external terminal of the equipment, the inner side is correspondingly arranged with the three groups of output common conductive sheets 19 to form the primary conductive bridge 38, the three groups of primary bridge type conductive sheets 15 on the primary conductive frame correspond to the three groups of primary conductive bridges 38 at the lower end, when the electromagnet 12 is powered to drive the primary conductive frame 14 to move, the three groups of primary bridge type conductive sheets 15 will be in contact with the three groups of L1, L2, L3 incoming line ends and the three groups of output common conductive sheets 19, for conducting the current channel of the primary conductive bridge, otherwise, it will be disconnected, the rear end of the primary conductive frame 14 is provided with a delay oil cylinder 20, for generating a delay working procedure of the equipment, the primary conductive frame 14 is provided with a main spring 21 between the piston inside the delay oil cylinder 20, for pulling the piston inside the delay oil cylinder to move, the outer side of the delay oil cylinder is provided with a delay adjusting valve 11, for adjusting the delay time, the rear end of the delay oil cylinder is provided with a reversing conductive frame support frame 27, the reversing conductive frame support frame is connected with the piston inside the delay oil cylinder, driven by the piston to move forward and backward, the reversing conductive frame support frame is installed with a reversing conductive frame 22, the reversing conductive frame is provided with three groups of bidirectional bridge type conductive sheets 23, the two sides of the bidirectional bridge type conductive sheets are respectively provided with three groups of delta type connection conductive bridges 24 and three groups of star type connection conductive bridges 25, one end of the delta type connection conductive bridge 24 is connected with the output common conductive sheet 19, the three groups of output common conductive sheets extend out of the equipment to form U1 output end 7, V1 output end 8 and W1 output end 9, one side of the three groups of star type connection conductive bridges 25 is connected with the control side of the delta type connection conductive bridge 24, and the other end is led out of the outer shell to form W2 output end 4, U2 output end 5 and V2 output end 6, the control side of the three groups of star type connection conductive bridges 25 is connected together by using a series short circuit sheet 26, so that it forms a short circuit state, when the reversing conductive frame is at the front end position, the three groups of bidirectional bridge type conductive sheets 23 inside the reversing conductive frame can conduct the three groups of delta type connection conductive bridges 24, when it is at the rear end position, it will be connected with the star type connection conductive bridge 25, driven by the piston inside the delay oil cylinder 20 to move forward and backward, when the equipment works, the three groups of incoming line ends L1, L2, L3 are respectively connected with 380V AC power supply, the three groups of output ends U1, V1, W1 are respectively connected with the input terminal of the motor, the three groups of output ends W2, U2, V2 are respectively connected with the commutating terminal of the motor, when the bidirectional bridge type conductive sheet 23 conducts the delta type connection conductive bridge 24, the three groups of coils inside the motor can realize the working mode of delta type connection, when the bidirectional bridge type conductive sheet conducts the star type connection conductive bridge 25, because the three groups of conductive sheets of the star type connection conductive bridge are in a short circuit state, at this time, the coils inside the motor can form the working mode of star type connection.Thus, the commutating conducting frame is used to switch the star connection and the delta connection. When the device is in standby state, the circuit channel controlled by the primary conducting frame 14 is disconnected, the delta connection conducting bridge 24 controlled by the commutating conducting frame 22 is disconnected, and the star connection conducting bridge 25 is in the initial conducting state. When the electromagnet 12 is powered, the primary conducting frame 14 is driven to be conducted. At this time, the motor is in the star connection working state. Because the main spring 21 between the primary conducting frame and the delay oil cylinder 20 has the function of energy storage, the piston inside the delay oil cylinder slowly descends. When the piston moves to the lowest position, the commutating conducting frame 22 is pulled to disconnect the star connection conducting bridge 25, and the delta connection conducting bridge 24 is conducted. At this time, the motor is in the delta connection working state. The reset spring 28 is arranged between the commutating conducting frame support frame and the outer shell 1. When the electromagnet is powered off, the reset spring is used to reset the delay oil cylinder and the commutating conducting frame. The contact points are respectively arranged on the contact end faces of the primary bridge conducting sheet, the primary conducting bridge, the bidirectional bridge conducting sheet, the star connection conducting bridge and the delta connection conducting bridge, which are used to enhance the conducting performance. The primary bridge conducting sheet is provided with the main arc extinguishing cover 29 on both sides, and the bidirectional bridge conducting sheet is provided with the auxiliary arc extinguishing cover 30 on both sides, which are used to extinguish the arc generated between the multiple groups of contact points.

[0013] By Figure 3It can be seen that the commutating conducting frame 22 is installed in the commutating conducting frame support frame 27, and is capable of moving forward and backward in the frame by limiting the position of the limiting rails on both sides. The commutating conducting frame 22 is provided with three groups of bidirectional bridge-type conducting sheets 23. The two sides of the bidirectional bridge-type conducting sheets are respectively provided with three groups of triangular connection conducting bridges 24 and three groups of star-shaped connection conducting bridges 25. One end of the triangular connection conducting bridge is connected with the output common conducting sheet 19. The output common conducting sheet extends outside the device to form the U1 output end 7, the V1 output end 8 and the W1 output end 9. One side of the three groups of star-shaped connection conducting bridges 25 is connected with the control side of the triangular connection conducting bridge 24 and is connected together. The end of the star-shaped connection conducting bridge extends outside the shell to form the W2 output end 4, the U2 output end 5 and the V2 output end 6. The control side of the three groups of star-shaped connection conducting bridges 25 is connected together by using the series shorting sheet 26, so that the star-shaped connection conducting bridge is in a short-circuit state. The shorted side is fixed on the insulator 31, so as to be isolated from the output common conducting sheet. When the commutating conducting frame 22 moves forward and backward, it will be in contact with the triangular connection conducting bridge 24 and the star-shaped connection conducting bridge 25, respectively, for conducting or disconnecting the current channel. The two sides of the middle part of the bidirectional bridge-type conducting sheet 23 are provided with conducting sheet adjusting springs 32 on the commutating conducting frame, so as to be in close contact with the two groups of conducting bridges. The rear end of the commutating conducting frame and the commutating conducting frame support frame are provided with pressure springs 33 for applying elastic force to the commutating conducting frame. One end of the magnetic force positioning rod 34 is installed on the shell of the device, and the other end is in contact with the two sides of the commutating conducting frame. The contact end of the magnetic force positioning rod and the commutating conducting frame are respectively provided with permanent magnets 35. The two groups of permanent magnets are attracted together by the magnetic attraction. The middle part of the front end of the commutating conducting frame support frame is provided with a support frame mounting head 36 for connecting with the piston inside the delay oil cylinder. The outer sides of the two sides of the commutating conducting frame support frame are provided with slide rails 37. The inner side of the shell is provided with a sliding groove corresponding to the slide rail. The sliding groove and the slide rail are matched to limit the position and enable the commutating conducting frame support frame to move forward and backward. The middle part of the rear end of the commutating conducting frame support frame is provided with a reset spring 28 for providing a reset pulling force. When the device is in a standby state, the bidirectional bridge-type conducting sheet 23 will conduct the current channel of the star-shaped connection conducting bridge 25 under the magnetic attraction of the permanent magnet 35. Since the star-shaped connection conducting bridge is in a short-circuit state, the three groups of coils inside the motor operate in a star connection mode at this time. When the piston inside the delay oil cylinder pulls the commutating conducting frame support frame 27 to move to the front end, the magnetic force positioning rod 34 and the commutating conducting frame 22 still maintain the attraction state under the action of the permanent magnet 35. At this time, the displacement degree between the commutating conducting frame support frame and the commutating conducting frame is absorbed by the pressure spring 33 and is stored. When the elastic force of the pressure spring 33 is greater than the attraction force of the permanent magnet 35, the commutating conducting frame 22 will be separated from the magnetic force positioning rod 34.The pressure spring 33 accumulates the elastic force to quickly push the commutating conducting frame to move to the front end of the commutating conducting frame support frame, at this time the bidirectional bridge type conducting sheet 23 is separated from the star type connecting conducting bridge and contacts the delta type connecting conducting bridge 24, the three groups of coils inside the motor can be converted to operate in the delta type connection mode, when the pulling force of the piston inside the delay oil cylinder disappears, the commutating conducting frame support frame can move to the rear end and reset under the pulling force of the reset spring 28, at this time the commutating conducting frame 22 can be attracted to the magnetic force positioning rod 34 again under the action of the permanent magnet 35, the bidirectional bridge type conducting sheet conducts the star type connecting conducting bridge again, and the equipment enters the standby state.

[0014] By Figure 4It can be seen that the inner lower end of the outer shell 1 is provided with an electromagnet 12, the upper end of the electromagnet is provided with a primary conductive frame 14, the moving iron core 13 of the electromagnet is connected with the primary conductive frame 14 as an integral structure, the primary conductive frame is provided with a primary bridge type conductive sheet 15, the two sides of the primary bridge type conductive sheet are provided with a primary conductive bridge 38, the front end of the primary conductive bridge is connected with the L1 incoming line end 16 and the L2, L3 incoming line end, the rear end is connected with the output end common conductive sheet 19, the upper end of the primary conductive frame is provided with a delay oil cylinder 20, the inside of the delay oil cylinder is provided with an upper cylinder sleeve 39 and a lower cylinder sleeve 40, the two cylinder sleeves are separated by a center sealing body 41 to form two independent chambers, the middle part of the center sealing body is provided with a sliding hole 42, the upper cylinder sleeve 39 is installed with an upper piston 43, the lower cylinder sleeve 40 is installed with a lower piston 44, the piston connecting rod 45 connects the upper piston and the lower piston as an integral structure after passing through the sliding hole 42, two groups of cylinder sleeves are filled with hydraulic oil, when the two groups of pistons move up and down, the volume chambers of the two groups of cylinder sleeves change in turn, and the internal hydraulic oil also flows between the two groups of cylinder sleeves, the center sealing body 41 is provided with an oil passage 46, the middle part of the oil passage is provided with a delay adjusting valve 11, the opening degree of the oil passage can be adjusted by changing the extension degree of the cone structure at the front end of the delay adjusting valve, the moving speed of the two groups of pistons in the two groups of cylinder sleeves can be adjusted by adjusting the flow of hydraulic oil flowing through the oil passage 46 during work, the center sealing body 41 is provided with a one-way oil valve 47, the hydraulic oil can flow quickly from the lower cylinder sleeve 40 to the upper cylinder sleeve 39 through the one-way oil valve, and vice versa, the lower piston 44 and the primary conductive frame 14 are provided with a main spring 21, the upper end of the delay oil cylinder 20 is provided with a reversing conductive frame support frame 27, the upper piston 43 and the reversing conductive frame support frame 27 are installed and connected as an integral whole, the reversing conductive frame support frame is installed with a reversing conductive frame 22, the middle part of the reversing conductive frame is provided with a bidirectional bridge type conductive sheet 23, the two sides of the bidirectional bridge type conductive sheet are provided with a triangular connection conductive bridge 24 and a star connection conductive bridge 25, one end of the triangular connection conductive bridge 24 is connected with the output end common conductive sheet 19, one end of the star connection conductive bridge 25 is installed on the insulating body 31, three groups of star connection conductive bridges are short-circuited as a whole by using a series of short-circuit sheets 26, the other end of the triangular connection conductive bridge and the star connection conductive bridge is combined to form a W2 output end 4 and U2, V2 output ends, the output end common conductive sheet 19 extends outward to form a U1 output end 7 and V1, W1 output ends, the reversing conductive frame 22 and the reversing conductive frame support frame are provided with a pressure bearing spring 33, one end of a magnetic force positioning rod 34 is fixed on the outer shell, the other end is in contact with the reversing conductive frame 22, the contact surface of the magnetic force positioning rod and the reversing conductive frame is provided with a permanent magnet 35, the lower end of the reversing conductive frame support frame 27 is connected with the upper piston 43 in the delay oil cylinder, the middle part of the upper end is provided with a reset spring 28 between the reversing conductive frame support frame and the outer shell, the two sides of the primary conductive frame are provided with a main arc extinguishing cover 29, the two sides of the reversing conductive frame are provided with a secondary arc extinguishing cover 30.

[0015] ByFigure 5 It can be seen that when the electromagnet 12 is energized, the moving iron core 13 can pull the primary conductive frame 38 to move downward, at this time the primary bridge-type conductive sheet 15 will conduct the primary conductive bridge 38, and the three-phase alternating current input by the L1 incoming line end 16 and the L2, L3 incoming line end will enter the U1 output end 7 and the V1, W1 output end through the primary conductive bridge and the output end common conductive sheet 19, and connect the input terminal block of the motor, at this time the star connection conductive bridge 25 on the commutating conductive frame 22 is conducted, and since the three groups of conductive sheets of the star connection conductive bridge are in a short-circuit state, at this time the three groups of coils inside the motor operate in a star connection mode, which is used to reduce the starting voltage and current of the motor, and since the hydraulic oil inside the upper cylinder sleeve 39 in the delay oil cylinder can only enter the lower oil cylinder 40 through the oil passage 46, and the flow of the oil passage is limited by the delay adjusting valve 11, when the moving iron core pulls the primary conductive frame 14 to move downward, the upper piston 43 will not immediately move downward under the resistance of the hydraulic oil, but will gradually move downward as the hydraulic oil in the upper cylinder sleeve gradually flows to the lower cylinder sleeve 40, at this time the instantaneous pulling force generated by the moving iron core will pull the main spring 21 apart, and after the main spring is pulled apart, it will store energy, and the pulling force stored by the main spring will continue to exert a pulling force on the lower piston 44, therefore the speed of the two groups of pistons descending depends on the flow of the oil passage 46, and the time of the two groups of pistons descending is the actual delay time value of the delay oil cylinder, and by adjusting the flow of the hydraulic oil through the delay adjusting valve 11, the delay time value can be adjusted, and since the magnetic force positioning rod 34 is attracted by the permanent magnet 35 on the commutating conductive frame 22, when the upper piston 43 pulls the commutating conductive frame support frame 27 to move downward, the commutating conductive frame 22 will not immediately separate from the magnetic force positioning rod 34 under the compression and energy storage effect of the pressure spring 33, and only when the commutating conductive frame support frame 27 continues to descend to the compression elastic force of the pressure spring 33 is greater than the attractive force of the permanent magnet, the commutating conductive frame 22 will separate from the magnetic force positioning rod 34, and the separation time is the time value of the commutating conductive frame conducting circuit commutation, and within this time value, the motor can start and run in a star connection mode.

[0016] By Figure 6 It can be seen that when the upper piston 43 continues to pull the commutating conductive frame support frame 27 to descend, and the elastic force stored by the pressure spring 33 is greater than the attractive force of the permanent magnet 35, the commutating conductive frame 22 will separate from the magnetic force positioning rod 34, at this time the commutating conductive frame rapidly descends under the thrust of the pressure spring 33 to make the bidirectional bridge-type conductive sheet 23 contact the delta connection conductive bridge 24 and conduct the circuit passage, at this time the three groups of current passages of the output end common conductive sheet 19 directly enter the commutating terminal block of the motor through the delta connection conductive bridge 24 and the W2, U2, V2 output end, and the three groups of coils inside the motor can operate in a delta connection and full voltage and full current mode.

[0017] The device is used, L1, L2, L3 incoming line end and power grid connection, U1, V1, W1 output end and motor input terminal post connection, W2, U2, V2 and motor commutation terminal post connection, electromagnet terminal 10 and the device start-stop circuit signal connection, the device can be used, when the electromagnet 12 in the device is energized, the moving iron core 13 and the primary conductive frame 14 move downward, at this time, the star-shaped connection conductive bridge 25 on the primary conductive bridge 38 and the commutating conductive frame 22 is turned on, the three-phase alternating current power supply enters the coil winding of the motor from the primary conductive bridge and U1, V1, W1 output end, because the star-shaped connection conductive bridge 25 is in a short-circuit state, at this time, the three groups of coils in the motor can operate in a star-shaped connection mode, when the electromagnet 12 is started, the main spring 21 is pulled open, the tension of the main spring continues to pull the upper piston 43 and the lower piston 44 in the delay oil cylinder 20 to move, because the oil passage 46 between the upper cylinder sleeve 39 and the lower cylinder sleeve 40 is limited by the delay adjusting valve 11, the time of the two pistons descending can be slowly descended, when the upper piston pulls the commutating conductive frame support frame 27 to move, because the permanent magnet 35 has the attraction force, the magnetic force positioning rod 34 and the commutating conductive frame 22 continue to maintain the combined state, when the elastic force accumulated by the pressure spring 33 is greater than the attraction force of the permanent magnet 35, the pressure spring will push the commutating conductive frame 22 to descend and turn on the delta-shaped connection conductive bridge 24, at this time, the three groups of coils in the motor form a delta-shaped connection state, the motor can operate in a delta-shaped connection mode, thereby realizing the automatic delay switching of the star-shaped and delta-shaped connection of the three-phase power supply circuit of the input motor.

[0018] The controller uses the conversion mode of the internal primary conductive frame and the commutating conductive frame to realize the conversion control of the input motor circuit, can automatically convert the star-delta connection of the three groups of coil windings in the motor, the whole conversion program is automatically performed in one device, avoids the instability of the traditional star-delta conversion circuit caused by the connection of multiple contactors and time relays, and the high use cost defect, the internal electromagnet of the controller is used as the driving force, the working mode is a full mechanical structure, can maintain high working stability, therefore, the working stability and use cost of the controller are superior to those of the traditional star-delta conversion circuit, and the wiring is simple, professional personnel is not needed for operation and maintenance, and it is more beneficial for users to accept.

[0019] The above is a specific description of the preferred embodiment of the application, but the application is not limited to the described embodiments, those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A star-delta automatic switching controller for an electric motor, comprising a housing 1, an electromagnet 12, a primary conductive frame 14, a delay cylinder 20, and a commutation conductive frame 22, characterized in that; The front end of the outer casing 1 is provided with L1 input terminal 16, L2 input terminal 17 and L3 input terminal 18. The rear end of the outer casing 1 is provided with W2 output terminal 4, U2 output terminal 5, V2 output terminal 6, U1 output terminal 7, V1 output terminal 8, W1 output terminal 9 and electromagnet terminal 10. The front end of the inner casing 1 is provided with an electromagnet 12. The moving iron core 13 at the rear end of the electromagnet is connected to the primary conductive frame 14. The rear end of the primary conductive frame 14 is provided with a delay cylinder 20. A main spring 21 is provided between the primary conductive frame 14 and the lower piston 44 inside the delay cylinder 20. The upper piston 43 inside the delay cylinder 20 is connected to the reversing conductive frame support frame 27. A reversing conductive frame 22 is installed inside the reversing conductive frame support frame 27. A return spring 28 is provided between the rear end of the reversing conductive frame support frame and the outer casing 1.

2. The star-delta automatic conversion controller for electric motors according to claim 1, characterized in that; The primary conductive frame 14 is provided with three sets of independent primary bridge conductive plates 15. The interiors of the L1 input terminal 16, L2 input terminal 17 and L3 input terminal 18 are arranged in correspondence with the three sets of common conductive plates 19 at the output terminals to form a primary conductive bridge 38. The three sets of primary bridge conductive plates 15 on the primary conductive frame correspond to the three sets of primary conductive bridges 38 at the lower end.

3. The star-delta automatic conversion controller for electric motors according to claim 1, characterized in that; The commutation conductor frame 22 is installed inside the commutation conductor frame support frame 27. Three sets of bidirectional bridge-type conductive plates 23 are provided on the commutation conductor frame 22. Three sets of delta-shaped connecting conductive bridges 24 and three sets of star-shaped connecting conductive bridges 25 are respectively provided on the upper and lower sides of the bidirectional bridge-type conductive plates. One end of each delta-shaped connecting conductive bridge is connected to the common output conductive plate 19. The three sets of common output conductive plates extend beyond the outer casing to form output terminals U1 7, V1 8, and W1 9. One side of each star-shaped connecting conductive bridge 25 is connected to the control side of the delta-shaped connecting conductive bridge 24, and its end extends beyond the outer casing to form output terminals W2 4, U2 5, and V2 6. The three sets of star-shaped connecting conductive bridges 25... The control side is connected together by series shorting pieces 26, and the shorted side is fixed on the insulator 31. The two sides of the bidirectional bridge conductive piece 23 are provided with conductive piece adjusting springs 32 between the middle of the bidirectional bridge conductive piece 23 and the commutation conductive frame. The rear end of the commutation conductive frame 22 is provided with a pressure bearing spring 33 between the rear end of the commutation conductive frame 22 and the commutation conductive frame support frame 27. One end of the magnetic positioning rod 34 is installed on the outer shell of the equipment, and the other end contacts the two sides of the commutation conductive frame 22. The contact ends of the magnetic positioning rod 34 and the commutation conductive frame 22 are respectively provided with permanent magnets 35. The front middle of the commutation conductive frame support frame 27 is provided with a support frame mounting head 36. The outer sides of the commutation conductive frame support frame are provided with slide rails 37. The inner shell of the equipment is provided with a slide groove at the position corresponding to the slide rails 37.

4. The star-delta automatic conversion controller for electric motors according to claim 1, characterized in that; The delay cylinder 20 has an upper cylinder liner 39 and a lower cylinder liner 40 inside. The upper cylinder liner and the lower cylinder liner are separated by a central sealing body 41. The central sealing body has a sliding hole 42 in the middle. An upper piston 43 is installed in the upper cylinder liner 39 and a lower piston 44 is installed in the lower cylinder liner 40. The piston connecting rod 45 passes through the sliding hole 42 and connects the upper piston 43 and the lower piston 44 into an integral structure. The upper cylinder liner 39 and the lower cylinder liner 40 are filled with hydraulic oil. The central sealing body 41 has an oil passage 46 and a one-way oil valve 47. A delay regulating valve 11 is provided in the middle of the oil passage 46.

5. The star-delta automatic conversion controller for electric motors according to claim 2, characterized in that; The primary bridge conductive sheet 15 is provided with main arc-extinguishing shields 29 on both sides.

6. The star-delta automatic conversion controller for electric motors according to claim 3, characterized in that; The bidirectional bridge conductive sheet 23 is provided with auxiliary arc-extinguishing covers 30 on both sides.

7. The star-delta automatic conversion controller for electric motors according to claims 2 and 3, characterized in that; The primary bridge conductive sheet 15 and the primary conductive bridge 38, as well as the bidirectional bridge conductive sheet 23 and the star-connected conductive bridge 25 and the delta-connected conductive bridge 24, are provided with contact points on their contact end surfaces.

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