A motor-type pulse magnetizer and its operation method

Abstract

The present invention relates to a motor-type pulse magnetizer and an operation method thereof. The motor-type pulse magnetizer comprises an energy storage and discharge integrated motor, an energy storage contactor, a starting capacitor, a centrifugal switch, a discharge switch and a magnetizing coil. After passing through the energy storage contactor, the AC mains is divided into two parallel paths, one of which is used to be connected to an energy storage winding of the energy storage and discharge integrated motor, and the other is used to be connected to a discharge winding of the energy storage and discharge integrated motor through a starting capacitor and a centrifugal switch connected in series in sequence, and the two parallel paths constitute an energy storage circuit. The discharge switch and the magnetizing coil are connected in series in sequence and then connected to the two ends of the discharge winding of the energy storage and discharge integrated motor to constitute a discharge circuit. The structure significantly reduces the volume of the magnetizer, reduces the manufacturing cost of the magnetizer and increases the service life of the magnetizer.

Description

Technical Field

[0001] The invention relates to the technical field of magnetizers, and in particular to a motor-type pulse magnetizer and an operating method thereof. Background Art

[0002] The magnetizer in the prior art mainly uses capacitors as magnetization power sources, and its working principle is: firstly, the city electricity is stored in the capacitor through the energy storage system, and then the pulsed large current generated by the capacitor discharge is used to magnetize the magnetic material through the discharge system. This structure has the following defects: the capacitor as the core component is expensive and has a short lifespan, and its energy storage system requires key components such as a boost transformer, resulting in a high cost, short lifespan, and large size of the whole machine. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a motor-type pulse magnetizer and its operating method which can significantly reduce the volume of the magnetizer, ensure the magnetization efficiency, reduce the manufacturing cost of the magnetizer and increase the service life of the magnetizer.

[0004] In the first aspect, the technical solution adopted by the present invention is a motor-type pulse magnetizer, including an energy storage and discharge integrated motor, an energy storage contactor, a starting capacitor, a centrifugal switch, a discharge switch and a magnetizing coil; the energy storage and discharge integrated motor includes a rotor and a stator coaxially arranged outside the rotor, a radial air gap is provided between the stator and the rotor, the stator includes a stator core, an energy storage winding and a discharge winding, and the axes of the energy storage winding and the discharge winding differ by 90° electrical angle in space; the rotor includes a rotating shaft, a rotor core coated on the outer periphery of the rotating shaft, and a compensating winding installed on the outer periphery of the rotor core by interference fit. compensation cylinder and a plurality of permanent magnets or electric excitation embedded in the rotor core; after passing through the energy storage contactor, the AC mains is divided into two parallel paths, one of which is used to connect with the energy storage winding of the energy storage and discharge integrated motor, and the other is used to connect with the discharge winding of the energy storage and discharge integrated motor through the starting capacitor and the centrifugal switch connected in series in sequence, and the two parallel paths constitute an energy storage circuit; the discharge switch and the magnetizing coil are connected in series in sequence and then connected to the two ends of the discharge winding of the energy storage and discharge integrated motor, and the discharge circuit is formed by the discharge switch, the magnetizing coil and the discharge winding of the energy storage and discharge integrated motor.

[0005] The beneficial effects of the present invention are as follows: a motor-type pulse magnetizer adopting the above structure utilizes the advantage that the integrated energy storage and discharge motor can work in both motoring and power generation working states, and integrates the core components of the energy storage system and discharge system of the magnetizer into one motor, thereby significantly reducing the volume of the magnetizer; since the motor itself has low cost and long life, it has more advantages than the use of capacitors in the original technology, so the manufacturing cost of the magnetizer is reduced and the service life of the magnetizer is increased; the integrated energy storage and discharge motor can be used to provide a large pulse current for the magnetizing coil to magnetize the magnetic material, thereby ensuring the magnetization efficiency while reducing the volume of the magnetizer.

[0006] Preferably, the discharge switch adopts a thyristor. With this structure, the thyristor has the effect of automatically turning off when crossing zero, so that the current output to the magnetizing coil can be approximately a positive half-cycle pulse current of a sinusoidal current.

[0007] Preferably, the compensating cylinder is made of copper or aluminum. With this structure, copper and aluminum have high strength and high electrical conductivity.

[0008] In a second aspect, the technical solution adopted by the present invention is a method for operating a motor-type pulse magnetizer, the method comprising the following steps:

[0009] Step 1: Energy storage process:

[0010] The energy storage contactor and the centrifugal switch are closed, and the energy storage winding of the energy storage and discharge integrated motor is connected to the AC mains, and the discharge winding is connected to the AC mains after being connected in series with the starting capacitor; the energy storage winding and the discharge winding form an elliptical rotating magnetomotive force in the air gap, inducing current on the compensation cylinder of the rotor, thereby generating a rotor magnetic field. The rotor magnetic field interacts with the stator magnetic field to generate a starting torque, causing the motor to rotate;

[0011] When the motor reaches a certain speed, the centrifugal switch automatically disconnects, and the discharge winding is automatically cut out of the energy storage circuit. The rotor of the energy storage and discharge integrated motor continues to increase speed under the action of the pulsating magnetomotive force generated by the energy storage winding until the motor reaches a no-load speed n0 close to the synchronous speed. At this time, the energy storage contactor is disconnected, allowing the energy storage and discharge integrated motor to rotate freely by inertia, completing an energy storage process.

[0012] Step 2: Discharge process:

[0013] During the free rotation of the energy storage and discharge integrated motor, the induced voltage of the discharge winding is monitored. When the induced voltage of the discharge winding passes through zero and is in the same direction as the conduction direction of the discharge switch, the discharge switch is triggered and the discharge circuit is closed. After the discharge circuit is closed, the discharge winding discharges to the magnetizing coil. At the same time, the compensation cylinder on the rotor induces current, and the discharge winding outputs an instantaneous strong current pulse to the magnetizing coil. At this time, the motor speed drops from n0 to n1, and the kinetic energy stored in the rotor is quickly converted into electrical energy.

[0014] Step 3: Continuous operation:

[0015] After a single discharge is completed, the discharge switch is disconnected and the discharge circuit is cut off; the energy storage contactor is closed to close the energy storage circuit, and the energy storage winding is connected to the mains. After re-energization, the energy storage winding generates a pulsating magnetomotive force, which acts on the rotor magnetic field generated by the induced current of the compensation cylinder, continuing to accelerate the energy storage and discharge integrated motor, reaching the no-load speed n0 again, and completing the kinetic energy replenishment.

[0016] The operating method of the motor-type pulse magnetizer mentioned above is adopted. The method uses the integrated energy storage and discharge motor as the pulse power supply of the magnetizer to magnetize the magnetic material. The method significantly reduces the volume of the magnetizer, reduces the manufacturing cost of the magnetizer, and increases the service life of the magnetizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a motor-type pulse magnetizer of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the permanent magnet energy storage and discharge integrated motor used in the present invention;

[0019] Figure 3 It is a structural schematic diagram of the electrically excited energy storage and discharge integrated motor used in the present invention;

[0020] Figure 4 It is the connection diagram of the energy storage winding and the discharge winding in the present invention;

[0021] Figure 5 It is a current waveform diagram output to the magnetizing coil in the present invention;

[0022] Figure 6 The figures are comparison diagrams of the magnetic lines of force in the case of no compensation cylinder and the case of a compensation cylinder in the present invention; wherein (a) is a magnetic line of force effect diagram in the case of no compensation cylinder, and (b) is a magnetic line of force effect diagram in the case of a compensation cylinder;

[0023] As shown in the figure: 1. Energy storage winding; 2. Discharge winding; 3. Compensation cylinder; 4. Permanent magnet; 5. Energy storage contactor; 6. Starting capacitor; 7. Centrifugal switch; 8. Discharge switch; 9. Magnetization coil; 10. Stator core; 11. Rotor core; 12. Rotating shaft. DETAILED DESCRIPTION

[0024] The invention will be further described below with reference to the accompanying drawings and in combination with specific implementations, so that those skilled in the art can implement the invention with reference to the description. The protection scope of the invention is not limited to the specific implementations.

[0025] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0026] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] The present invention provides a motor-type pulse magnetizer, such as Figure 1 As shown, it includes an energy storage and discharge integrated motor, an energy storage contactor 5, a starting capacitor 6, a centrifugal switch 7, a discharge switch 8 and a magnetizing coil 9; Figure 2 As shown, the energy storage and discharge integrated motor includes a rotor and a stator coaxially arranged outside the rotor, a radial air gap is provided between the stator and the rotor, the stator includes a stator core 10, an energy storage winding 1 and a discharge winding 2, the axes of the energy storage winding 1 and the discharge winding 2 differ by 90° electrical angle in space, and the connection diagram of the energy storage winding 1 and the discharge winding 2 is as shown in Figure 4As shown, it belongs to the prior art and will not be expanded here; the rotor includes a rotating shaft 12, a rotor core 11 wrapped around the outer periphery of the rotating shaft 12, a compensation cylinder 3 installed on the outer periphery of the rotor core 11 by interference fit, and a plurality of permanent magnets 4 embedded in the rotor core 11; Figure 2 In the embodiment, the energy storage and discharge integrated motor adopts a permanent magnet 4-type energy storage and discharge integrated motor. The present invention is not limited to a permanent magnet 4-type energy storage and discharge integrated motor, and can also adopt Figure 3 The electrically excited energy storage and discharge integrated motor shown only needs to lead out the motor through brushes and slip rings and be excited by an external DC power supply; Figure 2 The permanent magnet 4-type energy storage and discharge integrated motor used in the invention is 4-pole, but the present invention is not limited to 4-pole permanent magnet 4-type energy storage and discharge integrated motor, and 2-pole and other pole numbers can also be used, depending on the requirements of energy storage and discharge waveforms. Figure 1 As shown, the AC mains is divided into two parallel paths after passing through the energy storage contactor 5, one of which is used to connect to the energy storage winding 1 of the energy storage and discharge integrated motor, and the other is used to connect to the discharge winding 2 of the energy storage and discharge integrated motor through the starting capacitor 6 and the centrifugal switch 7 connected in series in sequence, and the two parallel paths constitute an energy storage circuit; the discharge switch 8 and the magnetizing coil 9 are connected in series in sequence and then connected to the two ends of the discharge winding 2 of the energy storage and discharge integrated motor, and the discharge switch 8, the magnetizing coil 9 and the discharge winding 2 of the energy storage and discharge integrated motor constitute a discharge circuit.

[0029] Figure 1 A motor-type pulse magnetizer in the structure, by closing the energy storage contactor 5 and the centrifugal switch 7, the energy storage winding 1 of the energy storage and discharge integrated motor is directly connected to the AC mains, and the discharge winding 2 is connected in series with the starting capacitor 6 and then connected to the AC mains, and the energy storage and discharge integrated motor rotates; when the energy storage and discharge integrated motor reaches a certain speed, the centrifugal switch 7 is automatically disconnected, and the rotor continues to increase speed under the action of the pulsating magnetomotive force generated by the energy storage winding 1 until the motor reaches a no-load speed n0 close to the synchronous speed, at which time the energy storage contactor 5 is disconnected, so that the motor can rotate freely by inertia During the free rotation of the motor, when the voltage passes through zero and is in the same direction as the conduction direction of the discharge switch 8, the discharge switch 8 is triggered, the discharge circuit is closed, and the discharge winding 2 discharges to the magnetizing coil 9. At the same time, the compensation cylinder 3 on the rotor induces current, providing passive compensation for the discharge winding 2, compressing the magnetic lines into the air gap, and effectively reducing the equivalent inductance of the discharge winding 2, so that the discharge winding 2 outputs an instantaneous strong current pulse to the magnetizing coil 9. At this time, the motor speed drops from n0 to n1, and the kinetic energy stored in the rotor is quickly converted into electrical energy. Figure 1A motor-type pulse magnetizer in the structure cancels the solution of using a capacitor structure as the power source of the magnetizer in the original technology, directly utilizes the advantage that the energy storage and discharge integrated motor can work in both electric and power generation working states, and integrates the core components of the energy storage system and discharge system of the magnetizer into one motor. The energy storage and discharge integrated motor can provide a large pulse current for the magnetizing coil 9, which not only ensures the magnetization efficiency, but also significantly reduces the size of the magnetizer; due to the low cost and long life of the motor itself, it is more advantageous than the use of capacitors in the original technology, so the manufacturing cost of the magnetizer is reduced and the service life of the magnetizer is increased.

[0030] like Figure 1 As shown, the discharge switch 8 adopts a thyristor. With this structure, the thyristor has the effect of automatically turning off when crossing zero. Figure 5 As shown, the current output to the magnetizing coil 9 can be made to be approximately a positive half-cycle pulse current of a sinusoidal current.

[0031] like Figure 1 As shown, the material of the compensation cylinder 3 is copper or aluminum. With this structure, copper and aluminum have high strength and high electrical conductivity.

[0032] For example:

[0033] The magnetizer in the prior art is used, that is, a capacitor is used as a magnetizing power source to charge the magnetizing coil 9. The charging voltage of the capacitor is 2kV, the capacity of the capacitor is 3500μF, and the size of the capacitor magnetizer is 800mm*550mm*1100mm. The calculated energy storage is 7kJ.

[0034] Using a motor-type pulse magnetizer provided by the present invention, when the energy storage and discharge integrated motor is a 2-pole motor, the synchronous speed of the motor under industrial frequency power is 3000rpm, the outer diameter of the motor stator is 300mm, the iron core length is 140mm, and the kinetic energy can be stored 7kJ;

[0035] By using a motor-type pulse magnetizer provided by the present invention, when the energy storage and discharge integrated motor is a 4-pole motor, the synchronous speed of the motor under industrial frequency power is 1500rpm, the outer diameter of the motor stator is 400mm, the iron core length is 170mm, and 7kJ of kinetic energy can be stored.

[0036] It can be seen that the motor-type pulse magnetizer provided by the present invention can significantly reduce the volume of the magnetizer system while ensuring the magnetization efficiency, reduce the manufacturing cost of the magnetizer, and increase the service life of the magnetizer.

[0037] In practical applications, even if the energy storage and discharge integrated motor is installed in the control cabinet and integrated with components such as contactors and starting capacitors 6, its overall volume is much smaller than the solution using capacitors as magnetizing power sources in the prior art. In addition, compared with capacitors, motors are also lower in cost and longer in life.

[0038] according to Figure 1 The present invention also provides a method for operating the motor-type pulse magnetizer, which comprises the following steps:

[0039] Step 1: Energy storage process:

[0040] The energy storage contactor 5 and the centrifugal switch 7 are closed, and the energy storage winding 1 of the energy storage and discharge integrated motor is connected to the AC mains, and the discharge winding 2 is connected to the AC mains after being connected in series with the starting capacitor 6; due to the existence of the starting capacitor 6, the current of the discharge winding 2 will lead the current of the energy storage winding 1 by about 90° electrical angle. At the same time, in terms of winding setting, since the axes of the energy storage winding 1 and the discharge winding 2 differ by 90° electrical angle in space, the energy storage winding 1 and the discharge winding 2 will form an elliptical rotating magnetomotive force in the air gap, and induce current on the compensation cylinder 3 of the rotor, thereby generating a rotor magnetic field. The generated rotor magnetic field interacts with the stator magnetic field to generate a starting torque, so that the energy storage and discharge integrated motor rotates;

[0041] After the energy storage and discharge integrated motor reaches a certain speed, the centrifugal switch 7 will automatically disconnect, and the discharge winding 2 will automatically cut out from the energy storage circuit. The rotor of the energy storage and discharge integrated motor will continue to increase speed under the action of the pulsating magnetomotive force generated by the energy storage winding 1 until the energy storage and discharge integrated motor reaches a no-load speed n0 close to the synchronous speed. At this time, the energy storage contactor 5 is disconnected, so that the energy storage and discharge integrated motor can rotate freely by inertia, completing an energy storage process, that is, the electric energy is slowly stored in the rotor of the energy storage and discharge integrated motor in the form of kinetic energy; in this process, the energy storage and discharge integrated motor runs in the form of an electric motor, the discharge winding 2 plays the role of a starting winding, and the compensation cylinder 3 plays the role of a rotor cage;

[0042] Step 2: Discharge process:

[0043] When the energy storage and discharge integrated motor rotates freely, the energy storage winding 1 and the discharge winding 2 on the stator are both in an open circuit state, and due to the excitation of the permanent magnet 4 on the rotor, the energy storage winding 1 and the discharge winding 2 will both generate induced voltages, and the phases are 90° electrical angle apart from each other; when designing the motor, under the premise of the same equivalent heat generation rate, the number of turns and wire diameters of the two sets of windings are different, so that the induced voltage of the discharge winding 2 is higher and the internal impedance is small, which is more suitable for discharging the magnetizing coil 9;

[0044] During the free rotation of the energy storage and discharge integrated motor, the induced voltage of the discharge winding 2 is monitored. When the induced voltage of the discharge winding 2 passes through zero and is in the same conduction direction as the discharge switch 8, the discharge switch 8 is triggered and the discharge circuit is closed. After the discharge circuit is closed, Figure 6 As shown in (b), the discharge winding 2 discharges to the magnetizing coil 9, and at the same time, the compensation cylinder 3 on the rotor induces current, provides passive compensation for the discharge winding 2, and compresses the magnetic lines into the air gap, which can effectively reduce the equivalent inductance of the discharge winding 2, and further reduce the impedance in the energy storage and discharge integrated motor, so that an instantaneous strong current pulse can be output to the magnetizing coil 9. At this time, the motor speed drops from n0 to n1, and the kinetic energy stored in the rotor is quickly converted into electrical energy; in this process, the energy storage and discharge integrated motor operates in the form of a generator. Due to the passive compensation structure of the compensation cylinder 3, the output current is approximately a sinusoidal current. The discharge switch 8 used is a thyristor, which will automatically cut off when the current passes through zero. Therefore, the current output to the magnetizing coil 9 is a positive half-cycle pulse current that is approximately a sinusoidal current.

[0045] Step 3: Continuous operation:

[0046] After a single discharge is completed, the discharge switch 8 is disconnected and the discharge circuit is cut off; the energy storage contactor 5 is closed to close the energy storage circuit, and the energy storage winding 1 is connected to the mains. Since the discharge process cannot convert all the rotor kinetic energy into electrical energy, the motor is still in a rotating state with a speed of n1. The centrifugal switch 7 is also in an off state, and the discharge winding 2 is still cut out of the energy storage circuit; after the energy storage winding 1 is re-energized, a pulsating magnetomotive force is generated, which acts on the rotor magnetic field generated by the induced current of the compensation cylinder 3, and continues to accelerate the energy storage and discharge integrated motor, reaching the no-load speed n0 again, completing the kinetic energy replenishment.

[0047] The compensation cylinder 3 plays a key role in both the energy storage process and the discharge process. In the energy storage process, it is equivalent to the rotor cage structure in the induction energy storage and discharge integrated motor. The induced current generates torque, and compared with the cage structure, due to the resistance of the rotor, the critical slip rate of the energy storage and discharge integrated motor is greater than 1, and the starting torque is greater; in the discharge process, it is equivalent to the passive compensation structure of the pulse generator. The induced current at the moment of discharge evenly compensates the armature reaction, reduces the equivalent inductance of the discharge winding 2, and outputs a current with a higher amplitude that is approximately a sine wave. In addition, when the energy storage and discharge integrated motor is designed with a higher rotor linear speed in order to store more kinetic energy, the compensation cylinder 3 can also be used as a rotor sleeve to provide preload force for the rotor core 11 and reduce the stress of the rotor magnetic bridge.

[0048] The operating method of the motor-type pulse magnetizer mentioned above is adopted. The method uses the integrated energy storage and discharge motor as the pulse power supply of the magnetizer to magnetize the magnetic material. The method significantly reduces the volume of the magnetizer, reduces the manufacturing cost of the magnetizer, and increases the service life of the magnetizer.

Claims

1. A motor-type pulse magnetizer, characterized in that: The invention comprises an energy storage and discharge integrated motor, an energy storage contactor (5), a starting capacitor (6), a centrifugal switch (7), a discharge switch (8) and a magnetizing coil (9); the energy storage and discharge integrated motor comprises a rotor and a stator coaxially arranged outside the rotor, a radial air gap is arranged between the stator and the rotor, the stator comprises a stator core (10), an energy storage winding (1) and a discharge winding (2), the axes of the energy storage winding (1) and the discharge winding (2) differ by 90 degrees in electrical angle in space; the rotor comprises a rotating shaft (12), a rotor core (11) coated on the outer periphery of the rotating shaft (12), a compensation cylinder (3) installed on the outer periphery of the rotor core (11) by interference fit, and an internally embedded rotor. A plurality of permanent magnets (4) or electric excitation in the iron core (11); after passing through the energy storage contactor (5), the AC mains is divided into two parallel paths, one of which is used to connect to the energy storage winding (1) of the energy storage and discharge integrated motor, and the other is used to connect to the discharge winding (2) of the energy storage and discharge integrated motor through a starting capacitor (6) and a centrifugal switch (7) connected in series in sequence, and the two parallel paths constitute an energy storage circuit; the discharge switch (8) and the magnetizing coil (9) are connected in series in sequence and then connected to the two ends of the discharge winding (2) of the energy storage and discharge integrated motor, and the discharge switch (8), the magnetizing coil (9) and the discharge winding (2) of the energy storage and discharge integrated motor constitute a discharge circuit.

2. The motor-type pulse magnetizer according to claim 1, characterized in that: The discharge switch (8) is a thyristor.

3. A motor-type pulse magnetizer according to claim 1 or 2, characterized in that: The material of the compensation cylinder (3) is copper or aluminum.

4. A method for operating a motor-type pulse magnetizer according to any one of claims 1 to 3, the method comprising the following steps: Step 1: Energy storage process: The energy storage contactor (5) and the centrifugal switch (7) are closed, the energy storage winding (1) of the energy storage and discharge integrated motor is connected to the AC mains, and the discharge winding (2) is connected in series with the starting capacitor (6) and then connected to the AC mains; the energy storage winding (1) and the discharge winding (2) form an elliptical rotating magnetic motive force in the air gap, inducing current on the compensation cylinder (3) of the rotor, thereby generating a rotor magnetic field, and the rotor magnetic field interacts with the stator magnetic field to generate a starting torque, so that the motor rotates; After the motor reaches a certain speed, the centrifugal switch (7) is automatically disconnected, the discharge winding (2) is automatically cut out from the energy storage circuit, and the rotor of the energy storage and discharge integrated motor continues to increase speed under the action of the pulsating magnetomotive force generated by the energy storage winding (1), until the motor reaches a no-load speed n0 close to the synchronous speed, at which time the energy storage contactor (5) is disconnected, so that the energy storage and discharge integrated motor can rotate freely by inertia, completing an energy storage process; Step 2: Discharge process: During the free rotation of the energy storage and discharge integrated motor, the induced voltage of the discharge winding (2) is monitored. When the induced voltage of the discharge winding (2) passes through zero and is in the same direction as the conduction direction of the discharge switch (8), the discharge switch (8) is triggered and the discharge circuit is closed. After the discharge circuit is closed, the discharge winding (2) discharges to the magnetizing coil (9). At the same time, the compensation cylinder (3) on the rotor induces current, and the discharge winding (2) outputs an instantaneous strong current pulse to the magnetizing coil (9). At this time, the motor speed drops from n0 to n1, and the kinetic energy stored in the rotor is quickly converted into electrical energy. Step 3: Continuous operation: After a single discharge is completed, the discharge switch (8) is disconnected and the discharge circuit is cut off; the energy storage contactor (5) is closed to close the energy storage circuit, and the energy storage winding (1) is connected to the mains. After the energy storage winding (1) is re-energized, a pulsating magnetomotive force is generated, which acts on the rotor magnetic field generated by the induced current of the compensation cylinder (3), and continues to accelerate the energy storage and discharge integrated motor, reaches the no-load speed n0 again, and completes the kinetic energy replenishment.

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