Traction test equipment for elevator product production

Abstract

The invention discloses traction test equipment for elevator product production, and relates to the technical field of load test. The device specifically comprises a base, the outer walls of the tops of the two ends of the base are rotationally connected with a load winding drum through a first shaft and rotationally connected with a traction winding drum through a second shaft, and the outer wall of the top, located on one side of the load winding drum, of the base is provided with a variable load part used for applying rotary loads to the load winding drum. By arranging the load winding drum, the traction winding drum, the traction testing part and other parts, the traction force of the traction machine can be tested when the traction machine moves dynamically, meanwhile, the traction testing part is used for directly testing the size of the traction force borne by the traction rope, and on the basis that the dynamic test is guaranteed, the test efficiency is greatly improved. The traction machine testing device is matched with the working condition applied to the lift car through the traction rope in the working state of the traction machine, so that the testing of the whole device on the traction machine is more suitable for the actual working environment, and the testing authenticity is improved.

Description

Technical Field

[0001] This invention relates to the field of load testing technology, and more particularly to a traction testing device for elevator product manufacturing. Background Technology

[0002] In elevator products, the traction machine is a core component. As the drive for the elevator car's movement, the stability of its traction force output directly determines the stability of the elevator's operation. Therefore, a traction test needs to be performed on the traction machine before use.

[0003] A search revealed a Chinese patent publication number CN 219799027U, which discloses an elevator traction machine tension testing device. The device includes a base with symmetrically fixed side plates. A top plate is fixedly mounted on the top of each side plate. Rollers are rotatably connected to both top plates near each other. A traction machine is fixedly mounted on the top plate. A rotating wheel is fixedly connected to the output end of the traction machine. A steel rope is mounted on the rotating wheel, and a fixing member is fixedly connected to the end of the steel rope. A sliding plate is welded to the fixing member. Slider blocks are fixedly mounted on both sides of the sliding plate and slidably connected to the side plates. A tension testing instrument is fixedly connected to the bottom of the sliders.

[0004] The aforementioned patent has the following shortcomings: it uses a traction machine to pull a fixed object to achieve static testing, but in actual operation, the traction machine is in motion at different speeds, which makes the static test inconsistent with the actual working conditions and the test results have low consistency. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a traction testing device for elevator product manufacturing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A traction testing device for elevator product manufacturing includes a base. A load drum is rotatably connected to the top outer walls of both ends of the base via a first shaft, and a traction drum is rotatably connected to the top outer walls of the base via a second shaft. A variable load section for applying rotational load to the load drum is provided on the top outer wall of the base at one end of the traction drum. A mounting seat for mounting a traction machine is provided on the top outer wall of the base at one end of the traction drum. A coupling assembly for connecting the output shaft of the traction machine is provided at the end of the second shaft. The same traction rope is fixedly wound around the outer walls of the load drum and the traction drum. A traction testing section is provided on the base at the symmetrical center of the load drum and the traction drum. The traction test unit includes a rectangular frame fixed to the top outer wall of the base, a slider slidably connected to the inner wall of the rectangular frame via a guide rod, and a test pulley rotatably connected to the side wall of the slider and in contact with the bottom of the traction rope. The test pulley is fastened to the bottom outer wall of the slider, and a pressure sensor is fixed to the bottom upper surface of the rectangular frame. The other end of the spring is in contact with the pressure sensing end of the pressure sensor.

[0007] Preferably, the logic for the traction test unit to monitor the magnitude of the traction force is as follows: S1: When not being tested, record the pressure reading of the pressure sensor as P0. When testing, read the pressure reading of the pressure sensor as P1. Then test the direction of the force vector of the pulley on the traction rope, which is vertically upward and the magnitude is P1-P0. S2: Calculate the deformation x of spring one by using the difference between P1 and P0 and the elastic module k of spring one. x = (P1-P0) / k. The deformation of spring one is the displacement of the test pulley under force. S3: Since the load drum and traction drum are symmetrically arranged relative to the test pulley, the state of both sides of the traction rope is also symmetrical. At this time, the inclination angle of the traction rope is determined by combining the lateral distance L between the test pulley and the load drum and the traction drum. Then, the force exerted by the test pulley on the traction rope in step S1 is vectored and added together. That is, the traction rope at the test pulley is subjected to two vector traction forces along the direction of the traction rope and an upward vector support force from the test pulley. The sum of the three is equal to 0. The magnitude of the traction force is calculated in this way.

[0008] Furthermore, the inner wall of the slider is connected to multiple sets of balls, a guide rod is movably inserted into the inner wall of the slider, and the outer wall of the guide rod is provided with a groove for rolling connection with the balls.

[0009] Based on the aforementioned scheme: the coupling assembly includes a cylindrical shell, a sliding plate axially slidably connected to the inner wall of the cylindrical shell, and multiple sets of clamping arms axially slidably connected to the cylindrical shell. The cylindrical shell is fixed to the end of the shaft two. The side wall of the sliding plate is rotatably connected to multiple connecting rods that match the position and number of the clamping arms. The other end of the connecting rod is rotatably connected to the side wall of the clamping arm.

[0010] A better option among the aforementioned solutions is that the side wall of the slide plate is fastened with a second spring, and the other end of the second spring is fastened to the inner wall of the cylindrical shell.

[0011] As a further aspect of the present invention: the mounting base is slidably connected to the top outer wall of the base via a slide rail, and the top outer wall of the base is fixed with a telescopic device by bolts, the output end of the telescopic device being fixed to the bottom side wall of the mounting base by bolts.

[0012] Meanwhile, the variable load section includes multiple sets of linearly arranged generator rotor cores and multiple sets of generator stator windings that cooperate with and are linearly arranged with the generator rotor cores. The generator rotor cores are fixed to the outer wall of shaft one, and the outer wall of the generator stator windings is fixed with the same sliding sleeve that can slide linearly.

[0013] As a preferred embodiment of the present invention: the sliding sleeve is slidably connected to the top outer wall of the base via guide rod two, and the top outer wall of the base is fixed with a motor by bolts, the output shaft of the motor is fixed with a lead screw by a coupling, and the outer wall of the lead screw is threaded to the bottom of the sliding sleeve.

[0014] Meanwhile, the lead screw and shaft one are connected by a synchronous belt drive.

[0015] As a preferred embodiment of the present invention: the output terminals of the generator stator winding are electrically connected to a storage battery, and the output terminals of the storage battery are electrically connected to the expansion joint and the motor.

[0016] The beneficial effects of this invention are as follows: 1. This invention, by setting up components such as a load drum, a traction drum, and a traction test unit, enables the testing of the traction force of the traction machine under dynamic motion. At the same time, the traction test unit directly tests the magnitude of the traction force on the traction rope. While ensuring dynamic testing, it also matches the working conditions of the traction machine under operation, through the traction rope applied to the car. Therefore, the entire device makes the testing of the traction machine more in line with the actual working environment, increasing the authenticity of the test.

[0017] 2. This invention, through a targeted design of the sliding method between the slider and the first guide rod, utilizes the rolling cooperation of the groove and the ball to connect the slider and the first guide rod, thereby changing sliding friction into rolling friction, reducing the relative motion friction between the slider and the first guide rod, thus reducing test errors and improving test accuracy.

[0018] 3. This invention, by setting up a coupling assembly, utilizes a multi-jaw clamping and fixing mechanism to achieve the coupling fixation between shaft two and the traction machine, thereby simplifying the steps of traditional coupling bolt and key connection. At the same time, the mounting base can slide relative to each other, so that the installation and disassembly of the mounting base and the traction machine are separated at the coupling position. Furthermore, the coupling between shaft two and the traction machine can be automatically achieved by sliding the mounting base, thereby increasing the convenience of the entire operation and the efficiency of disassembly and assembly.

[0019] 4. This invention uses the combination of the generator stator winding and the generator rotor core as the load, and utilizes the characteristic that different numbers of combinations result in different damping to change the load. Therefore, compared with the traditional friction damping, this device can recover the energy generated by damping and then power the expansion joint and the motor again, thereby reducing the energy consumption of the test. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a traction testing device for elevator product manufacturing proposed in this invention. Figure 2 This is a schematic diagram of the traction testing section of a traction testing device for elevator product manufacturing proposed in this invention. Figure 3 This is a schematic diagram of the sliding block and guide rod of a traction testing device for elevator product manufacturing proposed in this invention. Figure 4 This is a schematic diagram of the coupling assembly structure of a traction testing device for elevator product manufacturing proposed in this invention. Figure 5 This is a schematic diagram of the mounting base and base mating structure of a traction testing device for elevator product manufacturing proposed in this invention; Figure 6 This is a schematic diagram of the variable load section structure of a traction testing device for elevator product manufacturing proposed in this invention. Figure 7 This is a schematic diagram of the circuit structure of a traction testing device for elevator product manufacturing proposed in this invention.

[0021] In the diagram: 1. Base; 2. Shaft 1; 3. Load drum; 4. Variable load section; 5. Traction test section; 6. Traction rope; 7. Coupling assembly; 8. Mounting seat; 9. Traction drum; 10. Shaft 2; 11. Pressure sensor; 12. Spring 1; 13. Test pulley; 14. Slider; 15. Guide rod 1; 16. Slide groove; 17. Ball bearing; 18. Spring 2; 19. Slide plate; 20. Cylinder shell; 21. Clamping arm; 22. Connecting rod; 23. Expansion joint; 24. Slide rail; 25. Generator stator winding; 26. Motor; 27. Guide rod 2; 28. Lead screw; 29. ​​Synchronous belt; 30. Generator rotor core; 31. Sliding sleeve; 32. Battery; 33. Rectangular frame. Detailed Implementation

[0022] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] Example 1: A traction testing device for elevator product manufacturing, such as... Figures 1-7As shown, the system includes a base 1. The top outer walls of both ends of the base 1 are rotatably connected to a load drum 3 via shaft 2 and a traction drum 9 via shaft 10, respectively. A variable load part 4 for applying rotational load to the load drum 3 is provided on the top outer wall of the base 1 on one side. A mounting seat 8 for mounting a traction machine is provided on the top outer wall of the base 1 at one end of the traction drum 9. A coupling assembly 7 for connecting the output shaft of the traction machine is provided at the end of shaft 10. The same traction rope 6 is fixedly wound around the outer walls of the load drum 3 and the traction drum 9. A traction test part 5 is provided at the symmetrical center of the load drum 3 and the traction drum 9 on the base 1.

[0025] The traction test unit 5 includes a rectangular frame 33 fixed to the top outer wall of the base 1, a slider 14 slidably connected to the inner wall of the rectangular frame 33 via a guide rod 15, and a test pulley 13 rotatably connected to the side wall of the slider 14 and in contact with the bottom of the traction rope 6. The test pulley 13 is fastened to the bottom outer wall of the slider 14. A pressure sensor 11 is fixed to the bottom upper surface of the rectangular frame 33, and the other end of the spring 12 is in contact with the pressure sensing end of the pressure sensor 11.

[0026] When using this device, the traction machine to be tested can be fixed by the mounting base 8, and then the output shaft of the traction machine can be connected to the shaft 10 through the coupling assembly 7. Then, the load drum 3 is applied by the variable load unit 4, and the traction machine is started to rotate and generate traction force. Then, the magnitude of the traction force is tested by the traction test unit 5. At the same time, a speed sensor can be set to monitor the speed of the traction machine. By combining the speed and the magnitude of the traction force, the magnitude and stability of the traction force of the traction machine under different loads and different speeds can be tested.

[0027] The logic for the traction test unit 5 to monitor the magnitude of the traction force is as follows: S1: When not being tested, record the pressure reading of pressure sensor 11 as P0. When testing, read the pressure reading of pressure sensor 11 as P1. Then, the force vector of the test pulley 13 on the traction rope 6 is vertically upward and the magnitude is P1-P0. S2: Calculate the deformation x of spring-12 using the difference between P1 and P0 and the elastic module k of spring-12. x = P1 - P0 / k. The deformation of spring-12 is the displacement of the test pulley 13 under force. S3: Since the load drum 3 and the traction drum 9 are symmetrically arranged relative to the test pulley 13, the state of the two sides of the traction rope 6 is also symmetrical. At this time, the tilt angle of the traction rope 6 is determined by combining the lateral distance L between the test pulley 13 and the load drum 3 and the traction drum 9. Then, the force exerted by the test pulley 13 on the traction rope 6 in step S1 is vectored and added together. That is, the traction rope 6 at the test pulley 13 is subjected to two vector traction forces along the direction of the traction rope 6 and an upward vector support force from the test pulley 13. The sum of the three is equal to 0. The magnitude of the traction force is calculated in this way.

[0028] This device, by setting up components such as the load drum 3, the traction drum 9, and the traction test unit 5, can test the traction force of the traction machine under dynamic movement. At the same time, the traction test unit 5 directly tests the magnitude of the traction force on the traction rope 6. While ensuring dynamic testing, it also matches the working conditions of the traction machine under operation, through the traction rope 6 applied to the car. Therefore, the entire device makes the testing of the traction machine more in line with the actual working environment, increasing the authenticity of the test.

[0029] To solve the accuracy problem; such as Figure 3 As shown, the inner wall of the slider 14 is connected to multiple sets of balls 17, the guide rod 15 is movably inserted into the inner wall of the slider 14, and the outer wall of the guide rod 15 is provided with a groove 16 that is rollably connected to the balls 17.

[0030] This device, through a targeted design of the sliding method between slider 14 and guide rod 15, utilizes the rolling cooperation of groove 16 and ball 17 to connect slider 14 and guide rod 15, thereby changing sliding friction into rolling friction, reducing the relative motion friction between slider 14 and guide rod 15, thus reducing test error and improving test accuracy.

[0031] To solve connectivity problems; such as Figure 1 As shown, the coupling assembly 7 includes a cylindrical shell 20, a sliding plate 19 axially slidably connected to the inner wall of the cylindrical shell 20, and multiple sets of clamping arms 21 axially slidably connected to the cylindrical shell 20. The cylindrical shell 20 is fixed to the end of the shaft 10. The side wall of the sliding plate 19 is rotatably connected to multiple connecting rods 22 that match the position and number of the clamping arms 21. The other end of the connecting rod 22 is rotatably connected to the side wall of the clamping arm 21. The side wall of the sliding plate 19 is fastened with a spring 18, and the other end of the spring 18 is fastened to the inner wall of the cylindrical shell 20.

[0032] The mounting base 8 is slidably connected to the top outer wall of the base 1 via a slide rail 24, and the top outer wall of the base 1 is fixed with a telescopic device 23 by bolts. The output end of the telescopic device 23 is fixed to the bottom side wall of the mounting base 8 by bolts.

[0033] During testing, the traction machine is installed on the top outer wall of the mounting base 8. Then, the mounting base 8 is driven by the telescopic device 23 to slide the traction machine. The output shaft of the traction machine will first contact the side wall of the slide plate 19 and then squeeze the slide plate 19 to slide inward. When the slide plate 19 slides inward, multiple clamping arms 21 can be moved inward by the connecting rod 22. The multiple clamping arms 21 are used to clamp and fix the output shaft of the traction machine, achieving the coupling effect.

[0034] This device, by setting up a coupling assembly 7, uses a multi-jaw clamping and fixing mechanism to fix the shaft 10 to the traction machine, thereby simplifying the steps of traditional coupling bolt and key connection. At the same time, the mounting base 8 can slide relative to the shaft, so that the installation and disassembly of the mounting base 8 and the traction machine are separated at the coupling position. Furthermore, the shaft 10 and the traction machine can be automatically connected by sliding the mounting base 8, thereby increasing the convenience of the entire operation and the efficiency of disassembly and assembly.

[0035] In this embodiment, during use and testing, the traction machine is installed on the top outer wall of the mounting base 8. Then, the mounting base 8 is driven by the telescopic device 23 to slide the traction machine. The output shaft of the traction machine will first contact the side wall of the slide plate 19 and then squeeze the slide plate 19 to slide inward. When the slide plate 19 slides inward, the connecting rod 22 can drive multiple clamping arms 21 to move inward. The multiple clamping arms 21 are used to clamp and fix the output shaft of the traction machine, achieving a coupling effect. Then, the variable load part 4 applies a load to the load drum 3, and then the traction machine is started to rotate and generate traction force. Then, the traction test part 5 tests the magnitude of the traction force. At the same time, a speed sensor can be set to monitor the speed of the traction machine. By combining the speed and the magnitude of the traction force, the magnitude and stability of the traction force of the traction machine under different loads and different speeds can be tested.

[0036] Example 2: A traction testing device for elevator product manufacturing, such as... Figures 1-7 As shown, in order to solve the problems of load variation and energy recovery, this embodiment makes the following improvements based on embodiment 1: The variable load part 4 includes multiple sets of linearly arranged generator rotor cores 30 and multiple sets of generator stator windings 25 that cooperate with the generator rotor cores 30 and are linearly arranged. The generator rotor cores 30 are fixed to the outer wall of shaft 2, and the outer wall of the generator stator windings 25 is fixed with the same sliding sleeve 31 that can slide linearly.

[0037] The sliding sleeve 31 is slidably connected to the top outer wall of the base 1 via the guide rod 27, and the top outer wall of the base 1 is fixed with a motor 26 by bolts. The output shaft of the motor 26 is fixed with a lead screw 28 via a coupling, and the outer wall of the lead screw 28 is threaded to the bottom of the sliding sleeve 31. When the motor 26 starts, it drives the lead screw 28 to rotate, which in turn drives the sliding sleeve 31 to slide along the guide rod 27. When the sliding sleeve 31 slides, it changes the number of the cooperating generator rotor core 30 and generator stator winding 25, thereby changing the rotational damping of shaft 2 and achieving the purpose of changing the load.

[0038] The lead screw 28 and shaft 2 are driven by a synchronous belt 29.

[0039] The output terminals of the generator stator winding 25 are electrically connected to the storage battery 32, and the output terminals of the storage battery 32 are electrically connected to the expansion joint 23 and the motor 26.

[0040] In this embodiment, when in the test state, the motor 26 is not powered on. At this time, the rotation of the load drum 3 will drive the shaft 2 to rotate, thereby driving the lead screw 28 to rotate, causing the sliding sleeve 31 to move. The number of mating parts between the generator stator winding 25 and the generator rotor core 30 gradually increases, and the load gradually increases. When the generator rotor core 30 and the generator stator winding 25 reach the maximum number of mating parts, the test is completed. At this time, the motor 26 starts, which drives the lead screw 28 to rotate in the opposite direction. On the one hand, it rewinds the traction rope 6 onto the load drum 3, and on the other hand, it resets the generator stator winding 25 and the generator rotor core 30 to the minimum number of mating parts.

[0041] This device uses the combination of generator stator winding 25 and generator rotor core 30 as the load, and utilizes the characteristic that different numbers of combinations result in different damping to change the load. Therefore, compared with the traditional friction damping, this device can recover the energy generated by damping and then power the expansion joint 23 and motor 26 again, thereby reducing the energy consumption of the test.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A traction testing device for elevator product manufacturing, comprising a base (1), characterized in that, The top outer walls of the two ends of the base (1) are respectively rotatably connected to a load drum (3) via shaft one (2) and a traction drum (9) via shaft two (10). The top outer wall of the base (1) located on one side of the load drum (3) is provided with a variable load part (4) for applying rotational load to the load drum (3). The top outer wall of the base (1) located at one end of the traction drum (9) is provided with a mounting seat (8) for mounting the traction machine. The end of shaft two (10) is provided with a coupling assembly (7) for connecting the output shaft of the traction machine. The load drum (3) and the traction drum (9) are fixedly wound with the same traction rope (6). The base (1) is provided with a traction test part (5) located at the symmetrical center of the load drum (3) and the traction drum (9). The traction test section (5) includes a rectangular frame (33) fixed to the top outer wall of the base (1), a slider (14) slidably connected to the inner wall of the rectangular frame (33) via a guide rod (15), and a test pulley (13) rotatably connected to the side wall of the slider (14) and in contact with the bottom of the traction rope (6). The test pulley (13) is fastened to the bottom outer wall of the slider (14). A pressure sensor (11) is fixed to the bottom upper surface of the rectangular frame (33), and the other end of the spring (12) is in contact with the pressure sensing end of the pressure sensor (11).

2. The traction testing equipment for elevator product manufacturing according to claim 1, characterized in that, The logic for the traction test unit (5) to monitor the magnitude of the traction force is as follows: S1: When not being tested, record the pressure reading of the pressure sensor (11) as P0. When testing, read the pressure reading of the pressure sensor (11) as P1. Then the force vector of the test pulley (13) on the traction rope (6) is vertically upward and the magnitude is P1-P0. S2: Calculate the deformation x of spring 1 (12) by the difference between P1 and P0 and the elastic module k of spring 1 (12), x = (P1-P0) / k, and the deformation of spring 1 (12) is the displacement of the test pulley (13) under force. S3: Since the load drum (3) and the traction drum (9) are arranged symmetrically relative to the test pulley (13), the state of the two sides of the traction rope (6) is also symmetrical. At this time, the tilt angle of the traction rope (6) is determined by combining the lateral distance L between the test pulley (13) and the load drum (3) and the traction drum (9). Then, the force exerted by the test pulley (13) on the traction rope (6) in step S1 is vectored and added together. That is, the traction rope (6) at the test pulley (13) is subjected to two vector traction forces along the direction of the traction rope (6) and a vector support force upward from the test pulley (13). The sum of the three is equal to 0. The magnitude of the traction force is calculated in this way.

3. The traction testing equipment for elevator product manufacturing according to claim 1, characterized in that, The inner wall of the slider (14) is connected to multiple sets of balls (17), and the guide rod (15) is movably inserted into the inner wall of the slider (14). The outer wall of the guide rod (15) is provided with a groove (16) that is connected to the balls (17) in a rolling manner.

4. The traction testing equipment for elevator product manufacturing according to claim 1, characterized in that, The coupling assembly (7) includes a cylindrical shell (20), a sliding plate (19) axially slidably connected to the inner wall of the cylindrical shell (20), and multiple sets of clamping arms (21) axially slidably connected to the cylindrical shell (20). The cylindrical shell (20) is fixed to the end of the shaft (10). The side wall of the sliding plate (19) is rotatably connected to multiple connecting rods (22) that match the position and number of the clamping arms (21). The other end of the connecting rod (22) is rotatably connected to the side wall of the clamping arm (21).

5. The traction testing equipment for elevator product manufacturing according to claim 4, characterized in that, The side wall of the slide plate (19) is fastened with a second spring (18), and the other end of the second spring (18) is fastened to the inner wall of the cylindrical shell (20).

6. The traction testing equipment for elevator product manufacturing according to claim 4, characterized in that, The mounting base (8) is slidably connected to the top outer wall of the base (1) via a slide rail (24), and the top outer wall of the base (1) is fixed with a telescopic device (23) by bolts. The output end of the telescopic device (23) is fixed to the bottom side wall of the mounting base (8) by bolts.

7. The traction testing equipment for elevator product manufacturing according to claim 1, characterized in that, The variable load section (4) includes multiple sets of linearly arranged generator rotor cores (30) and multiple sets of generator stator windings (25) that cooperate with and are linearly arranged with the generator rotor cores (30). The generator rotor cores (30) are fixed to the outer wall of shaft one (2), and the outer wall of the generator stator windings (25) is fixed with the same sliding sleeve (31) that can slide linearly.

8. The traction testing equipment for elevator product manufacturing according to claim 7, characterized in that, The sliding sleeve (31) is slidably connected to the top outer wall of the base (1) via the guide rod (27), and the top outer wall of the base (1) is fixed with a motor (26) by bolts. The output shaft of the motor (26) is fixed with a lead screw (28) via a coupling. The outer wall of the lead screw (28) is threaded to the bottom of the sliding sleeve (31).

9. The traction testing equipment for elevator product manufacturing according to claim 8, characterized in that, The lead screw (28) and shaft 1 (2) are driven by a synchronous belt (29).

10. The traction testing equipment for elevator product manufacturing according to claim 8, characterized in that, The output terminals of the generator stator winding (25) are electrically connected to the storage battery (32), and the output terminals of the storage battery (32) are electrically connected to the expansion joint (23) and the motor (26).

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