CN112165210A

CN112165210A - Magnetic suspension flywheel energy storage motor generator

Info

Publication number: CN112165210A
Application number: CN202010786208.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-01-01

Abstract

A magnetic suspension flywheel energy storage motor generator is provided with an integrated disposable heat dissipation system of a vacuum shell, a flywheel, a rotor, a stator core, a stator shaft and an auxiliary bearing; under the condition of not depending on an external power supply, the flywheel stores energy in a standby mode and a power generation mode, realizes that the flywheel runs in the power generation mode and supplies power to the magnetic suspension bearing, enables the rotating shaft of the flywheel to be self-suspended, and is beneficial to independent running and transportation and transfer of the energy storage of the flywheel; the self-vacuumizing device of the turbine vane pump rotor reduces the energy consumption of a flywheel energy storage system, and the power density of the self-vacuumizing device is improved.

Description

Magnetic suspension flywheel energy storage motor generator

Technical Field

The invention belongs to the technical field of flywheel energy storage motors, generators and new energy, and relates to a generator of a magnetic suspension flywheel energy storage motor.

Background

The vehicle adopts the hybrid propulsion of an internal combustion engine and a motor, the flywheel battery is charged quickly and discharged completely, and the vehicle is very suitable for being applied to the hybrid energy propulsion vehicle. When the vehicle is in normal running and braking, the flywheel battery is charged, and when the vehicle is accelerated or climbs, the flywheel battery provides power for the vehicle, so that the rotating speed of the vehicle in a stable and optimal state is ensured, the fuel consumption, the air and noise pollution, the maintenance of the engine and the service life of the engine can be reduced.

Super capacitor energy storage formula bus passes through on-vehicle electric capacity drive, and 30 seconds "second fills" once charge mileage of traveling only 8~10 kilometers, and every bus line station is reformed transform into the charging station, and investment charging station fund is fairly big, and the mileage and the region of traveling have received very big restriction.

The flywheel energy storage system is used as a substitute product of a chemical battery and a super capacitor, and has the advantages of long service life, small maintenance amount, high efficiency and high power. Flywheel energy storage relies on rotatory flywheel rotor inertia to convert the electric energy into kinetic energy and store, realizes uninterrupted power supply under the condition of having a power failure. When the flywheel rotates at a high speed for a long time, the heat productivity of the rotor is large, the heat productivity of the stator is large under the condition that large current is concentrated to discharge, if the heat cannot be dissipated timely, the stator and the rotor are damaged by overhigh temperature, and the whole machine is damaged. Meanwhile, the flywheel energy accumulator is used as a mechanical device rotating at a high speed, a bearing system is a key component of the flywheel energy accumulator, and the lubricating and heat dissipation effects of the bearing are also the key for reliable operation of the whole system.

The following are some representative related technologies related to flywheel energy storage: CN 201720695674.7 discloses an integral heat dissipation device of a high energy storage flywheel system, CN201811189965.4 discloses a self-suspension flywheel battery multi-mode drive control system, and CN 201820664428.X discloses a self-vacuumizing storage tank and a multi-stage flywheel starting transmission power generation device disclosed by CN 208656573U.

The existing high-speed magnetic suspension flywheel has the following four defects.

1. The existing high-speed flywheel middle supporting structure adopts a structure that a permanent magnet is matched with a rotor core, and when the flywheel rotates at a high speed, high-frequency air gap magnetic field harmonic waves can generate a large amount of eddy current loss on the permanent magnet or the rotor core.

2. The generated vortex causes the rotor to generate heat, and because the flywheel energy storage rotor or the flywheel motor rotor operates in a vacuum environment, the heat generated by the rotor is difficult to radiate and dissipate, and the times of the flywheel energy storage system in unit time at rated power and capacity are reduced.

3. The flywheel energy storage heat dissipation system can not simultaneously give consideration to the integrated one-time heat dissipation of the vacuum shell, the flywheel, the rotor, the stator core, the stator shaft and the auxiliary bearing.

4. The suspension winding in the bearingless permanent magnet synchronous motor must continuously supply power, except for the energy charging mode of flywheel energy storage, the suspension winding can be powered by an external power supply, and other conditions such as standby and power generation modes, the mechanical rotating shaft cannot be suspended or connected with other storage battery power supplies for power supply emergency, and the independent operation and transportation transfer of the flywheel battery cannot be realized.

5. An external vacuum system is used for vacuumizing flywheel energy storage products, the economy is low, the energy consumption is high, the control difficulty is high, the space and the installation position are limited, the molecular image has a certain distance to a vacuum chamber, and the vacuumizing difficulty is increased.

Disclosure of Invention

In view of the above, the present invention provides a magnetic suspension flywheel energy storage motor generator, which can realize the integrated one-time heat dissipation of a vacuum shell, a flywheel, a rotor, a stator core, a stator shaft and an auxiliary bearing.

Under the condition of not depending on an external power supply, the flywheel stores energy in a standby mode and a power generation mode, and the flywheel power generation mode is realized

The power is supplied to the magnetic suspension bearing during operation, so that the rotating shaft of the flywheel is self-suspended, and the independent operation and transportation transfer of the energy storage of the flywheel are facilitated.

The self-vacuumizing device of the turbine blade pump rotor reduces the energy consumption of a flywheel energy storage system.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a magnetic suspension flywheel energy storage motor generator, fig. 1-4 includes vacuum casing 101, flywheel assembly 119, radial and axial magnetic suspension bearing motor system, motor/generator, hollow shaft 133 of stator core, dynamic sealing ring 150, auxiliary bearing 148, cooling system and self-vacuum pumping device to form the vacuum cavity; the flywheel assembly 119 integrates a plurality of magnetic bearing motors and the permanent magnet outer rotor of the motor/generator; stator core windings of the magnetic suspension bearing motors are electrified to generate radial and axial suspension support of the flywheel assembly 119, and stator core windings 125 of the motor are electrified to drive the flywheel assembly to rotate, so that the flywheel assembly is in an energy storage mode; when the rotating speed of the flywheel assembly 119 reaches a preset value, the motor is converted into the generator mode, the flywheel assembly becomes the energy release discharge mode, the inertia potential energy of the flywheel assembly 119 is utilized to apply work to the generator, the generator permanent magnet outer rotor 122 of the flywheel assembly cuts the generator stator core winding 125 to generate induction current, and the induction current is rectified and stabilized to supply power to a load user; electrical energy storage, conversion and recombination are performed by a power controller system.

As an embodiment of the present invention, the vacuum casing 101 shown in fig. 2 is a round can structure, and includes a casing body 102, a casing bottom 103, and a casing cover 104, where the casing body 102 and the casing bottom 103 are integrated; the axes of the machine shell bottom 103 and the machine shell cover 104 are provided with a hollow shaft sleeve 134, a spline shaft sleeve 147, a movable sealing ring caulking groove 151, a built-in pump body 157 of the stator core and a hollow rotating shaft sleeve 112 of the flywheel assembly, and the inner circle of the hollow rotating shaft sleeve 112 is provided with a concave ring groove cooling flow channel 113; the casing body 102, the casing bottom 103 and the casing cover 104 are internally provided with a spiral cooling flow channel 108 and a vortex cooling flow channel 109 which are communicated with each other, the vortex cooling flow channel 109 is communicated with the casing bottom 103, the casing cover 104 and an inner circular concave ring groove cooling flow channel 113 opening of the flywheel assembly hollow rotating shaft sleeve 112, and cooling liquid flows from one end of the inner circular concave ring groove cooling flow channel 113 of the flywheel assembly hollow rotating shaft sleeve 112 to the inner circular concave ring groove cooling flow channel 113 of the flywheel assembly hollow rotating shaft sleeve 112 at the other end and flows out; the casing body 102 and the casing cover 104 are fastened and connected through screws and sealant, and the vacuum casing 101 is made of an aluminum-titanium alloy, and the outer layer of the aluminum-titanium alloy is wrapped with a carbon fiber resin composite material.

Further, a mortise and tenon joint structure is arranged at a connecting part of the case body 102 and the case cover 104.

As an embodiment of the present invention, the flywheel assembly shown in fig. 2 is cylindrical, and the upper and lower supporting discs thereof are umbrella-shaped structures, including the magnetic suspension bearing motor and the permanent magnet outer rotor 122 of the motor/generator, the flywheel body 105, and the upper and lower flywheel supporting discs, which form the flywheel assembly 119; the upper and lower supporting discs are provided with a hollow rotating shaft 111, an auxiliary bearing caulking groove 149, a movable sealing ring caulking groove 151 and a flow guide compressed air round hole 118 of the flywheel assembly; the flywheel body 105 and the upper and lower supporting disc built-in spiral cooling flow channel 108 and the vortex-shaped cooling flow channel 109 are communicated with each other, the vortex-shaped cooling flow channel 109 is communicated with the through hole of the outer circle of the hollow rotating shaft 111 and the through hole of the inner circle concave ring groove cooling flow channel 113 of the flywheel assembly, and cooling liquid flows from one end of the outer circle concave ring groove of the hollow rotating shaft 111 to the outer circle concave ring groove of the hollow rotating shaft 111 at the other end and flows out; the flywheel assembly is made of a permanent magnet and a multi-layer carbon fiber resin wrapping composite material.

Further, the radial magnetic suspension bearing motors M1 and M2 and the permanent magnet outer rotor 122 of the motor/generator are embedded in the inner circumference of the flywheel assembly in an encapsulating manner by epoxy resin, and the epoxy resin is consistent with the inner circumference of the flywheel assembly.

Further, the flywheel body 105 and the lower support plate 107 are integrally constructed, and the flywheel body 105 and the flywheel upper support plate 106 are fixedly connected by screws and sealant.

Furthermore, a mortise and tenon joint structure is arranged at the connecting part of the flywheel body 105 and the flywheel upper supporting disc 106.

As an embodiment of the present invention, the spiral cooling channel 129 built in the stator core of the motor/generator shown in fig. 4 is communicated with the cooling channel of the cavity of the hollow shaft 133 of the stator core, and the cooling liquid flows from one end to the other end of the cooling channel of the cavity of the hollow shaft 133 of the stator core; the motor/generator is a switched reluctance motor, a stepping reluctance motor, an iron core permanent magnet motor and a coreless permanent magnet motor, and the rotor of the motor/generator is of an inner rotor structure and an outer rotor structure.

Further, radial and axial magnetic suspension bearing motors M1, M2 and M3 are coaxially arranged with the motor/generator, and permanent magnets of the radial magnetic suspension bearing motors and the motor/generator are embedded in the flywheel assembly in the circumferential direction to form a shared flywheel permanent magnet outer rotor of a plurality of magnetic suspension bearing motors and motor/generators.

Further, the motor/generator power is much greater than the sum of the power of the radial and axial magnetic bearing motors M1, M2, and M3, the external vacuum pump motor, the circulating pump motor of the cooling flow path heat sink, and the fan motor.

As an embodiment of the present invention, the radial and axial magnetic suspension bearing system shown in fig. 3-4 comprises radial and axial magnetic suspension bearing motors M1, M2, M3, a flywheel assembly 119, a hollow rotating shaft 111 of the flywheel assembly and an auxiliary bearing 148; stator core windings 123 of the radial magnetic suspension bearing motors M1 and M2 are electrified to force the auxiliary bearing 148 of the hollow rotating shaft 111 of the flywheel assembly to radially suspend, stator core windings 124 of the axial magnetic suspension bearing motor M3 are electrified to force the auxiliary bearing 148 of the hollow rotating shaft 111 of the flywheel assembly to axially suspend, and the flywheel assembly 119 is in a radial and axial rotation suspension supporting state; the radial magnetic suspension bearing motors M1 and M2 are arranged on the symmetrical second side of the motor/generator, the axial magnetic suspension bearing motor M3 is arranged on the inner side of the flywheel upper supporting disc 106, a rotor support on the inner side of the flywheel upper supporting disc 106 is provided with the axial magnetic suspension bearing motor M3 permanent magnet, a stator of the axial magnetic suspension bearing motor M3 is of an iron core-containing structure and an iron core-free structure, and a rotor structure is of a double-side structure of a middle stator or a rotor and a double-gap structure formed by clamping one rotor disc between two stator discs; the auxiliary bearing 148 is a ceramic bearing.

Furthermore, the built-in spiral and vortex cooling flow channel 129 of the stator core of the radial and axial magnetic suspension bearing motors M1, M2 and M3 is communicated with the cooling flow channel of one cavity of the hollow shaft 133 of the stator core, and cooling liquid flows in from one end to the other end of the cooling flow channel of one cavity of the hollow shaft 133 of the stator core.

The radial and axial magnetic suspension bearing motors are switched reluctance motors, stepping reluctance motors, iron core permanent magnet motors and coreless permanent magnet motors, and the rotors of the radial and axial magnetic suspension bearing motors are of an inner rotor structure and an outer rotor structure and are coaxial.

Further, the current of the stator core windings 123 of the radial magnetic suspension bearing motors M1 and M2 is adjusted through PWM control, the axial suspension gap of the auxiliary bearing 148 of the hollow rotating shaft 111 of the flywheel assembly is adjusted, the current of the stator core winding 124 of the axial magnetic suspension bearing motor M3 is adjusted through PWM control, and the radial suspension gap of the auxiliary bearing 148 of the hollow rotating shaft 111 of the flywheel assembly is adjusted.

As an embodiment of the present invention, the outer circle of the hollow shaft 133 of the stator core shown in fig. 4 is a stepped shape and the inner circle thereof has a Y-shaped three-cavity structure, the outer circumference of the stator core quill 133 includes a shaft head, a journal 144, a collar 145, a shaft body and a stator core support 141, the shaft head is tubular, the end part of the shaft neck 144 is a spline shaft 142, the shaft neck 144 is provided with an excircle concave ring groove cooling flow channel 113 shunting through hole and an auxiliary bearing 148, the inner ring of the auxiliary bearing 148 is tangential to the collar 145, the shaft body is provided with a plurality of cooling flow path interfaces, the plurality of cooling flow channel interfaces are in communication with the plurality of stator core helical cooling flow channels 129, the hollow shaft bracket 141 of the stator core is provided with a concave key slot which is intersected and tangent with the convex teeth of the inner circle of the plurality of stator cores, the spline shaft 142 is tangent to the spline shaft sleeve 147 of the chassis bottom 103 and the chassis cover 104; the inner circle of the hollow shaft 133 of the stator core comprises a cavity cooling runner passage 135, a two-cavity cable wire passage 136 and a three-cavity vacuum suction passage 137, and the cavity cooling runner pipe is provided with the journal 144 outer circle concave ring groove cooling runner 113 through hole which is tangent to the intersection interface of the inner circle concave ring groove cooling runner 113 through hole of the hollow rotating shaft 111 of the flywheel assembly; the two-cavity cable channel 136 is provided with a through hole on the shaft body of the two-cavity, and the stator core winding cable lead passes through the through hole and is connected with a power controller; the three-cavity vacuum sucking channel 137 is provided with a plurality of vacuum sucking through holes 139 which are communicated with an external vacuum-pumping machine, wherein the hollow shaft 133 of the stator core is made of a non-magnetic metal and carbon fiber resin composite material.

As an embodiment of the present invention, the cooling system shown in fig. 1 to 4 includes an integrated structure of an external vacuum casing cooling channel, a flywheel assembly cooling channel, a stator core hollow shaft 133 cooling channel, and an auxiliary bearing 148 cooling channel; the cooling runner follows a cavity one end cooling runner of stator core's hollow shaft 133 spindle nose flows in, warp 113 through-holes of journal 144 excircle spill annular cooling runner of stator core's hollow shaft are shunted and are given 113 through-holes of interior circle spill annular cooling runner of hollow pivot 111 of flywheel assembly, 113 through-holes of excircle spill annular cooling runner of hollow pivot 111 of flywheel assembly are shunted again and are given the interior concave annular cooling runner 113 of the hollow pivot cover 112 of flywheel assembly of chassis bottom 103 and chassis cover 104 converges in the cooling runner export of a cavity other end of stator core's hollow shaft 133 spindle nose, the cooling runner in a cavity of stator core 133 is imported and exported and is carried out circulative cooling with external radiator and circulating pump connection.

Wherein the through hole of the journal 144 outer circular concave ring groove cooling flow channel 113 of the hollow shaft 133 of the stator core is tangent to the through hole of the inner circular concave ring groove cooling flow channel 113 of the hollow rotating shaft 111 of the flywheel assembly.

The through hole of the cooling flow channel 113 of the concave ring groove in the excircle of the hollow rotating shaft 111 of the flywheel assembly is tangent to the cooling flow channel 113 of the concave ring groove in the hollow rotating shaft sleeve 112 of the flywheel assembly of the chassis bottom 103 and the chassis cover 104.

Further, the auxiliary bearing 148 is tangential to a cooling channel of a cavity of the hollow shaft 133 of the stator core, and the cooling channel of the cavity of the hollow shaft 133 of the stator core is used for cooling the auxiliary bearing 148.

As an embodiment of the present invention, the self-vacuum apparatus of fig. 1-3 includes an internal pump body 157, a pump rotor 159, a turbine blade 155, a self-vacuum outlet 158, a one-way valve, and a vacuum pressure gauge; the built-in pump body 157 is embedded inside the chassis bottom 103 and the chassis cover 104, the self-vacuumizing exhaust holes are arranged inside the chassis bottom 103 and the chassis cover 104, the exhaust holes are communicated with external vacuum exhaust outlets of the chassis bottom 103 and the chassis cover 104 through a plurality of guide pipes arranged inside the chassis bottom 103 and the chassis cover 104, and the vacuum exhaust outlets are provided with one-way valves and vacuum pressure gauges; the hollow rotating shaft 111 step excircle concave key groove of the flywheel assembly is intersected with the inner circle convex tooth of the pump rotor 159 in a tangent mode and locked by a bolt; the pump rotor 159 and the hollow rotating shaft 111 of the flywheel assembly rotate synchronously; the pump rotor 159 and the turbine blades 155 are made of a carbon fiber resin composite material.

Further, during the operation of the self-vacuum pumping device, the pump rotor 159 is mounted on the outer circumference rotating shaft of the hollow rotating shaft 111 of the flywheel assembly, when the flywheel assembly rotates, the pump rotor 159 rotates along with the rotation of the flywheel assembly, the pump rotor 159 drives the turbine blades 155 to rotate, the gap air between the flywheel assembly 119 and the stator cores of the radial and axial magnetic suspension bearing motors M1, M2 and M3 and the stator cores of the motors/generators flows to the turbine blades 155 through the guiding compressed air circular holes 118 of the upper and lower supporting disks, meanwhile, the gap air between the vacuum casing and the flywheel assembly 119 flows to the turbine blades 155, the air flows to the plurality of exhaust holes arranged on the inner sides of the casing bottom 103 and the casing cover 104 along with the continuous rotation of the turbine blades 155, the plurality of exhaust holes are connected with the self-vacuum pumping air outlet 158 by pipes, and the air is exhausted from.

Furthermore, the upper part of the self-vacuum pumping device is a turbine molecular pump, and the lower part of the self-vacuum pumping device is a double-pump superposed composite molecular pump body which is a traction molecular pump.

Further, the outer evacuating device comprises a hollow shaft for accommodating the flywheel assembly, the stator core, a movable sealing ring, an auxiliary bearing, radial and axial magnetic suspension bearing motors M1, M2, M3 and a vacuum cavity of the motor/generator, wherein three cavities of a hollow shaft body of the stator core are provided with a plurality of vacuum suction ports communicated with the circular holes of the diversion compressed air of the upper and lower supporting discs of the flywheel assembly 119 for sucking and exhausting air in the gap between the flywheel assembly 119 and the stator core winding, three cavities of a hollow shaft head of the stator core are provided with one-way valves communicated with external vacuum pump exhaust ports, and the housing cover is provided with a vacuum pressure gauge.

5-6, the power controller system includes an external power module, a super capacitor module, a DC-DC/AC step-up/step-down converter, an auto-switching module 152, a radial and axial magnetic bearing motor control module, and a motor/generator drive module and a rectifying and voltage stabilizing module; when the external power supply module supplies power, the currents of stator core windings of radial and axial magnetic suspension bearing motors M1, M2 and M3 are controlled through PWM to force a flywheel assembly auxiliary bearing 148 to be suspended in the radial and axial directions, then a motor driving module is started, the stator core winding 125 of the motor is conducted, a rotor of the flywheel assembly 119 rotates at a high speed, and the flywheel assembly is in an energy storage charging mode; when the rotating speed reaches a preset value, the power supply of the radial and axial magnetic suspension bearing motors M1, M2 and M3 is automatically switched to a super capacitor module power supply mode, and the starting enters a flywheel assembly energy maintaining operation mode; when an external load needs energy, the flywheel assembly 119 applies work to the generator, a generator permanent magnet in the flywheel assembly 119 cuts a stator core winding 125 of the generator to generate induced current, the induced current is rectified and stabilized to output electric energy to a direct current bus, the direct current bus supplies power to a load user, and at the moment, the flywheel assembly 119 is in an energy release and discharge mode; when the rotating speed of the flywheel assembly 119 gradually drops to zero, the switch for connecting the power controller with the external load is disconnected, the control switches of the radial magnetic bearing motors M1, M2 and M3 are disconnected, and the flywheel assembly 119 completely enters a shutdown mode; wherein part of the electric energy generated by the generator is subjected to voltage reduction through the DC-DC converter to alternately charge the Sc1 and the Sc2 super capacitor module; the Sc1 and Sc2 super capacitor modules boost the voltage through the DC-DC converter and alternately provide the suspension electric energy of the flywheel assembly 119 to the radial and axial magnetic suspension bearing motors M1, M2 and M3; secondly, the charging and discharging of the Sc1 and Sc2 super capacitor modules are always automatically switched to a state; when the electric quantity of the Sc1 super capacitor module is lower than a preset value, the DC-DC converter is automatically switched to a Sc2 super capacitor module discharging mode, and the Sc1 super capacitor module DC-DC converter is automatically switched to a charging mode.

Further, the working mode of the Sc super capacitor module is as follows: at the same time, the Sc1 super capacitor module is charged, the Sc2 super capacitor module is in a discharging mode, and conversely, the Sc1 super capacitor module is discharged, and the Sc2 super capacitor module is in a charging mode.

Furthermore, the power controller also comprises a high-voltage insulation monitoring module, a detection, acquisition and diagnosis module and a cooler device, wherein the high-voltage insulation monitoring module is used for monitoring leakage current faults in real time and disconnecting all power supplies in a circuit; the detection and diagnosis module is used for protecting the safe operation of the driving motor and the generator from voltage, current, rotating speed, temperature, overvoltage and overcurrent; the cooler device is composed of a plurality of layers of oil cooling, air cooling, liquid cooling, cooling pipes and heat absorbing sheets and used for power control heat dissipation.

The power controller frequency converter circuit is shown in fig. 5-6 and comprises an external power supply module, a DC-DC/AC boost converter, a Sc super capacitor module DC/DC buck converter, radial and axial magnetic suspension bearing motors M1, M2 and M3 control and motor DC/AC converters, a generator output rectifying and voltage stabilizing module and an automatic switching module.

External power supply module DC/DC boost converter fig. 5: the boost direct-current chopper circuit consists of an external power supply module ECU, a reactor L1, an insulated gate bipolar transistor VT20, a diode D19 and a capacitor C2; when the voltage is boosted, the external power supply module ECU switches on and off the control electrode of the insulated gate bipolar transistor VT20, wherein the insulated gate bipolar transistor VT20 plays a role of a switch, so that the induced electromotive force on the reactor L1 and the voltage of the external power supply module DC220V are superposed to provide a high-voltage power supply to supply power to the bus.

The DC-AC converters of the radial and axial magnetic suspension bearing motors M1, M2 and M3 are shown in FIGS. 5-6, convert DC500V of a direct current bus into AC500V to supply power to the radial and axial magnetic suspension bearing motors M1, M2 and M3, and voltage type three-phase bridge inverter circuits are formed by insulated gate bipolar transistors VT1-VT6, freewheeling diodes D1-D6, insulated gate bipolar transistors VT7-VT12, freewheeling diodes D7-D12, insulated gate bipolar transistors VT13-VT18, freewheeling diodes D13-D18 and a capacitor C2.

Further, if the frequency and time of trigger signals of VT1-VT6, VT7-VT12 and VT13-VT18 are changed, the phase and amplitude of the stator core winding current space phasor corresponding to the inverter input radial and axial magnetic suspension bearing motors M1, M2 and M3 can be changed to adapt to the magnetic suspension control of the radial and axial magnetic suspension bearing motors M1, M2 and M3.

The DC-AC converter of the motor is shown in figure 5, DC500V of a direct current bus is converted into AC500V to supply power to the motor, an automatic switching module 153 VT31 and a VT32 are conducted, and a voltage type three-phase bridge inverter circuit is formed by insulated gate bipolar transistors VT40-VT45, freewheeling diodes D40-D45 and a capacitor C2.

Furthermore, an ECU (electronic control Unit) powered by an external power supply triggers an insulated gate bipolar transistor control electrode to rapidly switch on and off VT1-VT6, VT7-VT12, VT13-VT18 and VT40-VT45, and forcibly converts DC500V direct current into three-phase AC500V alternating current.

The rectifying and voltage-stabilizing module is shown in fig. 6, alternating current output by the generator is converted into direct current, sinusoidal alternating current voltage with positive and negative alternating change of alternating current output is rectified and converted into unidirectional pulsating direct current voltage by utilizing unidirectional conductivity of diodes D46-D51, the direct current with larger pulsation after rectification is converted into smooth direct current, and electric energy is output to a load user and a Sc super capacitor module DC/DC buck converter.

Sc super capacitor module DC/DC buck converter figure 6, Sc1 super capacitor module DC/DC buck converter and Sc2 super capacitor module DC/DC buck converter.

The Sc1 super capacitor module DC/DC buck converter is shown in figure 6, and a buck direct current chopper circuit consists of a generator rectifier, an insulated gate bipolar transistor V23, a diode D24, a reactor L3 and a capacitor C5; when the voltage is reduced, the Sc1 super capacitor module ECU is conducted by using the insulated gate bipolar transistor VT23, reduces the DC800V to the DC voltage of the average value DC220V, and charges the Sc1 super capacitor module.

The Sc2 super capacitor module DC/DC buck converter is shown in FIG. 6, and the buck direct current chopper circuit is composed of a generator rectifier, an insulated gate bipolar transistor V27, a diode D28, a reactor L5 and a capacitor C7; when the voltage is reduced, the Sc2 super capacitor module ECU utilizes the insulated gate bipolar transistor V27 to be conducted, the DC800V is reduced to the direct current voltage of the average value DC220V, and the Sc2 super capacitor module is charged.

Further, the ac output from the generator is converted to dc, which is conducted to the load output voltage through the switches VT33 and VT 34.

FIG. 6 shows a Sc supercapacitor module DC/DC boost converter, which is composed of a Sc1 supercapacitor module DC/DC boost converter and a Sc2 supercapacitor module DC/DC boost converter.

The Sc1 super capacitor module DC/DC boost converter is shown in figure 6, and the boost direct-current chopper circuit is composed of a Sc1 super capacitor module ECU, a reactor L2, an insulated gate bipolar transistor VT22, a diode D21 and a capacitor C2; when boosting, the Sc1 super capacitor module ECU switches on and off the control electrode of the insulated gate bipolar transistor VT22, wherein the insulated gate bipolar transistor VT22 plays a role of a switch, and induced electromotive force on the reactor L2 and Sc1 super capacitor module DC220V voltage are superposed to provide a high-voltage power supply to supply power to the bus.

The Sc2 super capacitor module DC/DC boost converter is shown in figure 6, and the boost direct-current chopper circuit is composed of a Sc2 super capacitor module ECU, a reactor L4, an insulated gate bipolar transistor VT26, a diode D25 and a capacitor C2; when boosting, the Sc2 super capacitor module ECU switches on and off the control electrode of the insulated gate bipolar transistor VT26, wherein the insulated gate bipolar transistor VT26 plays a role of a switch, and induced electromotive force on the reactor L4 and Sc2 super capacitor module DC220V voltage are superposed to provide a high-voltage power supply to supply power to the bus.

In the automatic switching module 152 shown in fig. 5, the switching on or off of the insulated gate bipolar transistors VT29 and VT30 controls the Sc supercapacitor module DC/DC boost converter to boost and discharge to the DC bus, wherein the power supply of the external power supply module HV ECU is turned off, that is, the automatic switching module 152 is turned on, the Sc supercapacitor module boosts and discharges to the DC bus, and conversely, the automatic switching module 152 is turned off, that is, the external power supply module HV ECU is turned on, and the external power supply module HV ECU boosts and discharges to the DC bus through the boost converter.

5-6, the automatic switching module 153 is turned on by the insulated gate bipolar transistors VT31 and VT32 to control the dc bus to supply power to the motor driving circuit, wherein the external power supply module HV ECU supplies power, i.e., the automatic switching module 153 is turned on, the dc bus voltage boost circuit supplies power to the motor driving circuit, the external power supply module HV ECU supplies power is turned off, and the automatic switching module 153 is turned off to control, i.e., the flywheel assembly is switched to the standby and energy release discharge modes.

The ECU adopts a 64-bit computer to receive the information of voltage, current, pressure, temperature, rotating speed and corner sensors from the motor/generator, the radial magnetic suspension bearing motor, the axial magnetic suspension bearing motor, the external power module HV and Sc super capacitor module, the cooling and heat dissipation system, the self-vacuumizing device and the external vacuumizing device; based on this information, the results of the calculations are converted into control signals and the results of the comparisons and calculations are used to control the levitation forces of the radial and axial magnetic bearing motors, as well as the torque, power, pressure and temperature required by the motor/generators.

The control core component of the motor/generator is an external power supply HV ECU or a Sc super capacitor module ECU, in the external power supply HV ECU or the Sc super capacitor module ECU, a frequency converter is used for driving a control circuit of an insulated gate bipolar transistor module for converting the output current of the motor, and the frequency converter controls a microprocessor of an inverter circuit; the speed controller outputs a direct current instruction signal, the direct current instruction signal is multiplied by a rotor magnetic pole position signal of the motor angle-resolving sensor to obtain a current instruction signal required by the motor work, the current instruction signal refers to and tracks the actual work current signal of the motor, and the current instruction signal is converted into a switching signal to be output after being calculated by a PWM (pulse width modulation) comparator or pulse width modulation; after passing through the isolation circuit, the signal directly drives inverter circuit modules VT40-VT45 of the frequency converter to control extremely fast on and off, so that the purposes of inversion, phase change and orientation of the output current of the frequency converter are realized.

The radial and axial magnetic suspension bearing motors M1, M2 and M3 are used for controlling the magnetic suspension system in the control charts 5-6.

The control core component of the magnetic suspension bearing system of the radial and axial magnetic suspension bearing motors M1, M2 and M3 is an external power supply HV ECU or a Sc super capacitor module ECU, in the external power supply HV ECU or the Sc super capacitor module ECU, a frequency converter is used for driving a drive control circuit of an insulated gate bipolar transistor module for converting output currents of the radial and axial magnetic suspension bearing motors M1, M2 and M3, and the frequency converter controls a microprocessor of an inverter circuit; the speed commands of radial and axial magnetic suspension bearing motors M1, M2 and M3 stored in a microcomputer are compared with speed feedback signals of angle resolution sensors of the radial and axial magnetic suspension bearing motors M1, M2 and M3, a speed controller outputs a direct current command signal, the direct current command signal is multiplied by rotor magnetic pole position signals of the angle resolution sensors of the radial and axial magnetic suspension bearing motors M1, M2 and M3 to obtain current command signals required by the work of the radial and axial magnetic suspension bearing motors M1, M2 and M3, actual working current signals of the radial and axial magnetic suspension bearing motors M1, M2 and M3 are referred to and tracked, and are converted into switching signals to be output after being calculated through a PWM (pulse width modulation) comparator or pulse width modulation; after passing through the isolation circuit, the signal directly drives the inverter circuit modules VT1-VT6, VT7-VT12 and VT13-VT18 to control extremely fast on and off, so that the radial and axial suspension support purposes of the flywheel assembly 119 are realized.

The invention relates to a new energy electric vehicle, an electric power generator and a unit.

Compared with the prior art, the invention has the beneficial effects that.

(1) Under the condition of not depending on an external power supply, the flywheel assembly stores energy in a standby mode and a power generation mode, the self-running power supply mode of the magnetic suspension bearing motor is realized, the rotating shaft of the flywheel assembly is self-suspended, and the independent running and transportation transfer of the energy storage of the flywheel assembly are facilitated.

(2) The integrated one-time heat dissipation is realized, the vacuum casing cooling flow channel, the flywheel assembly cooling flow channel, the stator core cooling flow channel, the hollow shaft cooling flow channel of the stator core and the auxiliary bearing cooling flow channel are integrally constructed, and the power density of energy storage and energy release of the flywheel is improved.

(3) The self-vacuumizing device and the turbine pump rotor enable the flywheel energy storage system to further save energy.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Reference numerals: a vacuum enclosure 101; a case body 102; a chassis base 103; a chassis cover 104; a flywheel body 105; a flywheel upper support plate 106; a flywheel lower support plate 107; a helical cooling flow channel 108; a vortex-shaped cooling flow passage 109; a hollow shaft 111 of the flywheel assembly; a hollow rotating shaft sleeve 112 of the flywheel assembly; a concave ring groove cooling flow passage 113; a radial magnetic bearing motor M1; a radial magnetic bearing motor M2; an axial magnetic suspension bearing motor M3; a flow directing compressed gas bore 118; a flywheel assembly 119; permanent magnet outer rotor 120 of radial magnetic suspension bearing motors M1 and M2; a permanent magnet outer rotor 121 of the axial magnetic suspension bearing motor M3; the permanent magnet outer rotor 122 of the motor/generator; stator core windings 123 of radial magnetic bearing motors M1 and M2; stator core windings 124 of the axial magnetic bearing motor; stator core windings 125 of the motor/generator; stator core helical cooling channels 129; a hollow shaft 133 of the stator core; a hollow shaft sleeve 134 of the stator core; a cavity cooling runner passage 135; a two-cavity cable conduit channel 136; a three-cavity suction evacuation channel 137; a cooling flow channel interface 138; a vacuum suction through hole 139; a cable exit hole 140; stator core holder 141; a spline shaft 142; a head 116; a journal 144; a collar 145; a spline shaft sleeve 147; an auxiliary bearing 148; an auxiliary bearing insert groove 149; a dynamic seal ring 150; a movable sealing ring caulking groove 151; a magnetic levitation flywheel energy storage motor generator assembly 115; turbine blades 155; a pump rotor 159; a built-in pump body 157; a self-evacuation vent 158; the motor/generator 156; an automatic switching module 152; an automatic switching module 153; charging a Sc1 super capacitor module; sc2 super capacitor module.

Drawings

Fig. 1 is a schematic diagram of a cutting structure of a generator assembly of a magnetic suspension flywheel energy storage motor according to an embodiment of the invention.

Fig. 2 is a schematic cutting structure diagram of a vacuum casing and a turbine pump rotor of a magnetic suspension flywheel energy storage motor generator according to an embodiment of the invention.

Fig. 3 is a schematic diagram of a cutting structure of a magnetic suspension flywheel energy storage flywheel assembly according to an embodiment of the invention.

Fig. 4 is a schematic diagram of a magnetic suspension bearing motor of the magnetic suspension flywheel energy storage motor generator and a hollow shaft cutting structure of the motor/generator and the stator core according to the embodiment of the invention.

FIG. 5 is a schematic diagram of a charging mode circuit of a flywheel assembly of a generator of a magnetic levitation flywheel energy storage motor according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a circuit of a retention and discharge mode of a flywheel assembly of a generator of a magnetic levitation flywheel energy storage motor according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are not only a part of the embodiments of the present invention, but also not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1: please refer to fig. 1-4.

Step 1, specifically, the assembly step, the magnetic levitation flywheel energy storage motor generator assembly 115 is assembled as a whole.

Step 2. stator core windings 125 of the motor/generator are assembled with the hollow shaft 133 of the stator core: the inner convex key slots of the stator core windings 125 of the motor/generator are press-fit into and locked with the outer concave key slots of the hollow shaft 133 of the stator core.

Step 3, assembling 2 stator core windings 123 of the radial magnetic suspension bearing motor and a hollow shaft 133 of a stator core: the inner circle convex key slots of 2 stator core windings 123 of the radial magnetic suspension bearing motor are aligned with the outer circle concave key slots of the hollow shaft 133 of the stator core, pressed and locked, and arranged on the stator core windings 125 of the motor/generator for two symmetrical tests.

Step 4, assembling the stator core winding 124 of the axial magnetic suspension bearing motor and the hollow shaft 133 of the stator core: the inner circle convex key slot of the stator core winding 124 of the axial magnetic suspension bearing motor is aligned with the outer circle concave key slot of the hollow shaft 133 of the stator core, and pressed and locked.

And 5, leading cable wires of the stator core winding 125 of the motor/generator, the stator core winding 123 of the radial magnetic suspension bearing motor and the stator core winding 124 of the axial magnetic suspension bearing motor out to a two-cavity cable channel 136 through a cable leading-out hole 140 of a hollow shaft 133 of the stator core to be connected into the power controller.

And 6, connecting spiral cooling channels of the stator core winding 125 of the motor/generator, the stator core winding 123 of the radial magnetic suspension bearing motor and the stator core winding 124 of the axial magnetic suspension bearing motor with a port 138 of a cooling channel of a hollow shaft 133 of the stator core by using a copper pipe, wherein a cavity cooling channel 135 is connected with an external radiator port.

And 7, embedding permanent magnet outer rotors 120 of radial magnetic suspension bearing motors M1 and M2 in the inner wall of the flywheel assembly 119, and filling epoxy resin into corresponding positions of the permanent magnet outer rotor 122 of the motor/generator respectively.

And 8, encapsulating the permanent magnet outer rotor 121 of the axial magnetic suspension bearing motor M3 and the inner side of the support disc 106 on the flywheel by using epoxy resin.

Step 9, the hollow rotating shaft 111 of the flywheel assembly assists the bearing caulking groove 149 and the movable sealing ring caulking groove 151; the auxiliary bearing 148 and the dynamic seal ring 150 are pressed in respectively.

Step 10, inserting a hollow shaft 133 of a stator core into the axle center of the flywheel lower support plate 107, and assembling the hollow shaft 133 of the stator core with a motor/generator stator core winding 125, a radial magnetic suspension bearing motor stator core winding 123 and an axial magnetic suspension bearing motor stator core winding 124, wherein a shaft collar 145 of the hollow shaft 133 of the stator core is tangent to an auxiliary bearing 148, the other shaft head of the hollow shaft 133 of the stator core is sleeved into the auxiliary bearing 148 of the flywheel upper support plate 106, and the flywheel upper support plate 106 and the flywheel body 105 are screwed by sealing glue and screws.

And step 11, the stepped excircle concave-key slot of the hollow rotating shaft 111 of the flywheel assembly is tangent and intersected with the inner circle convex tooth of the turbopump rotor 159 and locked by a bolt.

Step 12. the assembly of flywheel assembly 119 with motor/generator, radial magnetic bearing motor, axial magnetic bearing motor and turbopump rotor 159 is formed as described above.

And step 13, the machine shell body 102 and the machine shell bottom 103 of the vacuum machine shell 101 are integrally constructed, a spline shaft sleeve 147 of the shaft center of the machine shell bottom 103 is tangent and intersected with a spline shaft 142 of the hollow shaft 133 of the stator core with the assembly body, a spline shaft sleeve 147 of the shaft center of the machine shell cover 104 is tangent and intersected with a spline shaft sleeve 147 of the other end of the hollow shaft 133 of the stator core, and the machine shell body 102 and the machine shell cover 104 are tangent and screwed by sealing glue and screws to form the magnetic suspension flywheel energy storage motor generator assembly body.

Example 2: please refer to fig. 5-6.

The four working modes of the power controller system of the magnetic suspension flywheel energy storage motor generator assembly are respectively an energy storage charging mode, an energy keeping running mode, an energy releasing discharging mode and a stopping mode.

The ECU adopts a 64-bit computer to receive the information of voltage, current, pressure, temperature, rotating speed and corner sensors from a motor/generator, a radial magnetic suspension bearing motor, an axial magnetic suspension bearing motor, an external power module HV, a Sc super capacitor module, a cooling and heat dissipation system and a self-vacuumizing device; based on this information, the results of the calculations are converted into control signals and the results of the comparisons and calculations are used to control the magnetic levitation forces of the magnetic bearing motor and the axial magnetic bearing motor, as well as the torque, power, pressure and temperature required by the motor/generator.

When the external power supply module supplies power, the currents of stator core windings of radial and axial magnetic suspension bearing motors M1, M2 and M3 are controlled through PWM to force a flywheel assembly auxiliary bearing 148 to be suspended in the radial and axial directions, then a motor driving module is started, the stator core winding 125 of the motor is conducted, the rotor of the flywheel assembly 119 rotates at a high speed, and the flywheel stores energy and is charged; when the rotating speed reaches a preset value, the power supply of the radial and axial magnetic suspension bearing motors M1, M2 and M3 is automatically switched to a super capacitor module power supply mode, and the starting enters a flywheel energy maintaining operation mode; when an external load needs energy, the flywheel assembly 119 applies work to the generator, a generator permanent magnet in the flywheel assembly 119 cuts a stator core winding 125 of the generator to generate induced current, the induced current is rectified and stabilized to output electric energy to a direct current bus, the direct current bus supplies power to a load user, and at the moment, the flywheel assembly 119 is in an energy release and discharge mode; when the rotating speed of the flywheel assembly 119 gradually drops to zero, the switch for connecting the power controller with the external load is disconnected, the control switches of the radial magnetic bearing motors M1, M2 and M3 are disconnected, and the flywheel assembly 119 completely enters a shutdown mode; wherein part of the electric energy generated by the generator is subjected to voltage reduction through the DC-DC converter to alternately charge the Sc1 and the Sc2 super capacitor module; the Sc1 and Sc2 super capacitor modules boost the voltage through the DC-DC converter and alternately provide the suspension electric energy of the flywheel assembly 119 to the radial and axial magnetic suspension bearing motors M1, M2 and M3; secondly, the charging and discharging of the Sc1 and Sc2 super capacitor modules are always automatically switched to a state; when the electric quantity of the Sc1 super capacitor module is lower than a preset value, the DC-DC converter is automatically switched to a Sc2 super capacitor module discharging mode, and the Sc1 super capacitor module DC-DC converter is automatically switched to a charging mode.

The fifth working mode: when the Sc1 and the Sc2 super capacitor modules supply power alternately, currents of stator core windings of the magnetic suspension bearing motors M1, M2 and M3 are controlled through PWM, so that the auxiliary bearing 148 of the flywheel assembly is forced to suspend in the radial direction and the axial direction, the rotor of the flywheel assembly 119 rotates at a high speed, and the flywheel stores energy and charges in a charging mode; when an external load needs energy, the flywheel assembly 119 applies work to the generator, the permanent magnet of the generator in the flywheel assembly 119 cuts a stator core winding 125 of the generator to generate induction current, the induction current is rectified and stabilized to output electric energy to a direct current bus, the direct current bus alternately charges the Sc1 and the Sc2 super capacitor module and outputs the electric energy to a load user, and the flywheel assembly 119 is in an energy release discharge mode; at the moment, the flywheel assembly is in a mode of simultaneously storing energy and releasing energy, the power of the generator is greater than the sum of the powers of the magnetic bearing motors M1, M2 and M3 and is 5: 1.

in another embodiment 3: flywheel energy storage and super capacitor energy storage hybrid bus.

The charging pile mainly comprises a bus hub driving motor module, a super-capacitor energy storage module and a flywheel energy storage module, wherein the hub driving motor is 100 kW, two groups of super-capacitor energy storage modules are 16 kWh, and magnetic suspension flywheel energy storage motor generator sets store energy at 96kWh, wherein each magnetic suspension flywheel energy storage motor generator is 180mm long at 2kWh, 230 mm in diameter, 23kg in mass, 200000 r/min in rotating speed, 1052 kg in total weight of 48 magnetic suspension flywheel energy storage motor generators, and 96kWh in total energy storage of the flywheel groups are placed at the chassis of a bus, so that a 16-ton flywheel energy storage and super-capacitor energy storage hybrid power type bus can run at 250 km/h, each bus station is not required to be provided, and the charging pile is more beneficial to the maneuverability and popularization and application of the flywheel energy storage and super-capacitor energy storage hybrid power type bus.

A flywheel energy storage and super capacitor energy storage hybrid bus is characterized in that a charging pile charges two groups of super capacitor energy storage modules for 16 kWh for 30 seconds and only needs 15 minutes for quickly charging the flywheel groups with total energy storage of 96 kWh; energy of the magnetic suspension flywheel energy storage motor generator is recovered during downhill and braking, the magnetic suspension flywheel energy storage motor generator charges the super capacitor energy storage module when a bus station and a traffic light stop temporarily, and the magnetic suspension flywheel energy storage motor generator and the super capacitor energy storage module jointly supply power to a driving motor 100 kW of a bus hub during uphill and acceleration.

Flywheel energy storage and super capacitor energy storage hybrid bus start mode: the Sc1 super capacitor module is conducted, the Sc1 super capacitor module boosting module supplies power to the direct current bus, the IGBT hub driving motor is rapidly conducted and turned off for 100 kW, or the magnetic suspension flywheel energy storage motor generator set is converted into an energy release discharge mode to supply power to the direct current bus, and the flywheel energy storage and super capacitor energy storage hybrid power type bus is driven to run.

In yet another embodiment 4, a magnetic levitation flywheel energy storage motor generator unit array grid peak load shaving application.

The system consists of a high-voltage alternating-current power supply network, an alternating-current voltage detection module, a direct-current side bus, a direct-current voltage detection module, a step-down transformer, a diode rectifier, a logic control unit, a magnetic suspension flywheel energy storage motor generator unit array system, an inverter, a grid-connected switch, a step-up transformer or a low-voltage alternating-current power supply network.

The high-voltage alternating-current power supply network is connected with the direct-current side bus through a transformer and a diode rectifier to provide energy for the direct-current bus.

Further, when the power grid enters a valley power time period, the voltage of the high-voltage alternating-current side power grid is supplied to the direct-current side bus through the step-down transformer and the diode rectifier, and the generator unit array system of the magnetic suspension flywheel energy storage motor is connected with the direct-current side bus in parallel respectively to form the generator unit array charging power supply system of the magnetic suspension flywheel energy storage motor.

The array system of the generator unit of the magnetic suspension flywheel energy storage motor, a direct current side bus, an inverter, a step-up transformer or a low-voltage alternating current power supply network form the array system of the generator unit of the magnetic suspension flywheel energy storage motor to form a power grid for supplying energy.

The inverter is connected to a direct-current side bus, and one path of output of the inverter is transmitted to a low-voltage alternating-current power supply network or is transmitted to a high-voltage alternating-current power supply network through a grid-connected switch and a step-up transformer.

Further, when the power grid enters a peak power time period, and when the power grid enters the peak power time period, under the control of the total power controller of the magnetic suspension flywheel energy storage motor generator array, each unit of the magnetic suspension flywheel energy storage motor generator discharges to a direct current side bus, and the direct current side bus supplies power to a low-voltage alternating current side power grid through an inverter or supplies power to a high-voltage alternating current side power grid through a step-up transformer.

A direct-current voltage detection module is arranged between the direct-current side bus and the ECU control, the direct-current voltage detection module detects the voltage value of the direct-current side bus, and the acquired analog voltage signals are converted into corresponding digital signals U1 to be transmitted to the ECU control.

An alternating voltage detection module is arranged between the high-voltage alternating-current side power grid and the ECU control, acquires a power supply voltage value of the high-voltage alternating-current side power grid, obtains a no-load voltage value of a direct-current side bus according to a rectification proportionality coefficient of the uncontrollable diode rectification circuit, and then converts an analog voltage signal acquired by the detection module into a corresponding digital signal U2 to be transmitted to the ECU control.

The magnetic suspension flywheel energy storage motor generator unit is connected with a direct current side bus through a unit power controller of the magnetic suspension flywheel energy storage motor generator unit, the driving unit power controller receives a deviation direct current voltage U controlled and transmitted by an ECU, and U = U1-U2; and the driving unit power controller makes a decision according to the U value and the SOC value state of the driving unit power controller, and sends different control instructions to the flywheel energy storage unit array system and the inverter.

Furthermore, the acquisition direct-current voltage detection module detects a direct-current side bus voltage value, converts an analog voltage signal of the direct-current side bus voltage value into a corresponding digital signal, acquires a high-voltage alternating-current power supply grid voltage value, converts the high-voltage alternating-current power supply grid voltage value into an average direct-current voltage value according to a proportionality coefficient, and converts an analog voltage signal of the high-voltage alternating-current power supply grid voltage value into a corresponding digital signal; and subtracting the average direct current voltage from the direct current side bus voltage to obtain a difference value, and defining the difference value as a deviation direct current voltage U.

The generator unit array system of the magnetic suspension flywheel energy storage motor can provide or absorb electric energy according to the peak load regulation and valley fill time period of a power grid, and has three working modes: a charging mode of a generator unit array system of the magnetic suspension flywheel energy storage motor; the generator unit array system of the magnetic suspension flywheel energy storage motor keeps an operation mode; and (3) a discharging mode of a generator unit array system of the magnetic suspension flywheel energy storage motor.

The charging mode of the generator unit array system of the magnetic suspension flywheel energy storage motor is as follows: when the power grid enters a valley power time period, the voltage of the high-voltage alternating-current side power grid is supplied to a direct-current side bus through a step-down transformer and a diode rectifier, the collected direct-current voltage data is located in a preset value interval, and if the SOC of a flywheel energy storage unit is less than 0.5-1, a generator unit array of the magnetic suspension flywheel energy storage motor is in a charging operation mode.

The generator unit array system of the magnetic suspension flywheel energy storage motor keeps an operation mode: when the collected direct-current voltage data are located in a preset value interval, if the flywheel energy storage unit SOC =1, the flywheel energy storage unit of the generator of the magnetic suspension flywheel energy storage motor enters a running keeping mode, and the inversion feedback device does not work.

The discharging mode of the generator unit array system of the magnetic suspension flywheel energy storage motor is as follows: when the power grid enters a peak power time period, acquiring direct current voltage data within a preset value interval, and if the SOC of the flywheel energy storage unit is =1 or is more than 0.5-1, enabling the generator unit array of the magnetic suspension flywheel energy storage motor to be in a charging operation mode; under the control of a total power controller of the flywheel energy storage array, each unit of the magnetic suspension flywheel energy storage motor generator discharges to a direct current side bus, and the direct current side bus supplies power to a low-voltage alternating current side power grid through an inverter or supplies power to a high-voltage alternating current side power grid through a step-up transformer.

Working principle diagrams of the magnetic suspension flywheel energy storage motor generator are shown in figures 1-6.

The magnetic suspension flywheel energy storage motor generator is divided into three working states of energy storage charging, energy keeping operation and energy release discharging. The energy storage of the generator of the magnetic suspension flywheel energy storage motor is realized by the inertia of the flywheel, and if the flywheel runs in an ideal state, no resistance loss exists, and the energy is completely stored and released. The energy storage capacity of the magnetic suspension flywheel energy storage motor generator depends on the rotational inertia and the rotating speed of the flywheel, and the energy storage capacity of the magnetic suspension flywheel energy storage motor generator can be greatly improved by increasing the rotating speed.

The principle of the magnetic suspension flywheel energy storage motor generator is that the working process of the magnetic suspension flywheel energy storage motor generator is as follows: under the action of the controller, an integrated motor in a magnetic suspension flywheel energy storage motor generator is driven by an external power supply to run in a motor mode, the motor drives the flywheel to rotate at a high speed, the flywheel finishes the process of storing kinetic energy, namely, electricity is used for charging a flywheel battery, then the flywheel is in an energy holding state with low loss, until when the automobile load needs energy, the flywheel drives the integrated motor to rotate, the integrated motor rotates in a generator mode, the kinetic energy is converted into electric energy, the electric energy is output outwards, the conversion from mechanical energy or the kinetic energy to the electric energy is finished, and the electric energy is converted into voltage required by various loads of the automobile through the power controller system to drive the loads to work. When the power controller system generates power, the rotating speed of the flywheel is gradually reduced, the flywheel of the power controller system runs in a vacuum environment and has extremely high rotating speed, wherein the rotating speed can reach 20 ten thousand r/min, and the used bearing is a non-contact magnetic suspension bearing.

Other advantages and modifications will readily occur to those skilled in the art, based upon the above description. Therefore, the present invention is not limited to the above specific examples, and a detailed and exemplary description of one aspect of the present invention will be given by way of example only. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. A magnetic suspension flywheel energy storage motor generator is characterized by comprising a vacuum casing, a flywheel assembly, radial and axial magnetic suspension bearing motor systems, a motor/generator, a hollow shaft of a stator core, a movable sealing ring, an auxiliary bearing, a cooling system and a self-vacuumizing device, wherein a vacuum cavity is formed by the hollow shaft of a stator core; the flywheel assembly integrates a plurality of magnetic suspension bearing motors and a permanent magnet outer rotor of a motor/generator; stator core windings of the plurality of magnetic suspension bearing motors are electrified to generate radial and axial suspension supports of the flywheel assembly, the stator core windings of the motor are electrified to drive the flywheel assembly to rotate, and the flywheel assembly is in an energy storage mode; when the rotating speed of the flywheel assembly reaches a preset value, the motor is converted into the generator mode, the flywheel assembly is in the energy release discharge mode, the flywheel assembly is used for applying work to the generator by utilizing the inertia potential energy of the flywheel assembly, the generator permanent magnet outer rotor of the flywheel assembly cuts a generator stator core winding to generate induction current, and the induction current is rectified and stabilized to supply power to a load user; electrical energy storage, conversion and recombination are performed by a power controller system.

2. A magnetic suspension flywheel energy storage motor generator as claimed in claim 1, wherein the vacuum casing is a round can structure, comprising a casing body, a casing bottom and a casing cover, the casing body and the casing bottom are integrated; the axes of the machine shell bottom and the machine shell cover are provided with a hollow shaft sleeve of the stator core, a spline shaft sleeve, a movable sealing ring caulking groove, a built-in pump body and a hollow rotating shaft sleeve of the flywheel assembly, and a concave ring groove cooling flow channel is arranged in the inner circle of the hollow rotating shaft sleeve; the spiral cooling flow channel and the vortex cooling flow channel are arranged in the machine shell body, the machine shell bottom and the machine shell cover and are communicated with each other, the vortex cooling flow channels of the machine shell bottom and the machine shell cover are communicated with the inner circle concave ring groove cooling flow channel opening of the hollow rotating shaft sleeve of the flywheel assembly, and cooling liquid flows from one end of the inner circle concave ring groove cooling flow channel of the hollow rotating shaft sleeve of the flywheel assembly to the inner circle concave ring groove cooling flow channel of the hollow rotating shaft sleeve of the flywheel assembly at the other end and flows out; the vacuum machine shell is characterized in that the machine shell body is fixedly connected with the machine shell cover through screws and sealing glue, and the outer layer of the material of the vacuum machine shell, namely the aluminum-titanium alloy, is wrapped with a carbon fiber resin composite material.

3. A magnetic suspension flywheel energy storage motor generator as claimed in claim 1, wherein the flywheel assembly is cylindrical and has umbrella-shaped supporting upper and lower discs, including the outer permanent magnet rotor, the flywheel body and the upper and lower flywheel supporting discs of the magnetic suspension bearing motor and the motor/generator; the upper and lower supporting disks are provided with a hollow rotating shaft, an auxiliary bearing embedded groove, a movable sealing ring embedded groove and a flow guide compressed air round hole of the flywheel assembly; the flywheel body and the upper and lower supporting disks are internally provided with a spiral cooling flow channel and a vortex-shaped cooling flow channel which are communicated with each other, the vortex-shaped cooling flow channel is communicated with a through hole of a cooling flow channel of the excircle and the inner circle concave ring groove of the hollow rotating shaft of the flywheel assembly, and cooling liquid flows into the outer circle concave ring groove of the hollow rotating shaft at one end of the outer circle concave ring groove of the hollow rotating shaft and flows out of the outer circle concave ring groove of the hollow; the flywheel assembly is made of a permanent magnet and a multi-layer carbon fiber resin wrapping composite material.

4. A magnetic suspension flywheel energy storage motor generator according to claim 1, characterized in that the stator core built-in spiral cooling flow channel of the motor/generator is communicated with the cooling flow channel of the hollow shaft-cavity of the stator core, and the cooling liquid flows from one end of the hollow shaft-cavity cooling flow channel of the stator core to the other end; the motor/generator is a switched reluctance motor, a stepping reluctance motor, an iron core permanent magnet motor and a coreless permanent magnet motor, and the rotor of the motor/generator is of an inner rotor structure and an outer rotor structure.

5. A magnetic levitation flywheel energy storage motor generator as claimed in claim 1, wherein the radial and axial magnetic levitation bearing motor system comprises a radial and axial magnetic levitation bearing motor, a flywheel assembly, a hollow rotating shaft of the flywheel assembly and an auxiliary bearing; the stator core winding of the radial magnetic suspension bearing motor is electrified to force the auxiliary bearing of the hollow rotating shaft of the flywheel assembly to radially suspend, the stator core winding of the axial magnetic suspension bearing motor is electrified to force the auxiliary bearing of the hollow rotating shaft of the flywheel assembly to axially suspend, and the flywheel assembly is in a radial and axial rotating suspension supporting state; the radial magnetic suspension bearing motor is arranged on the symmetrical second side of the motor/generator, the axial magnetic suspension bearing motor is arranged on the inner side of the flywheel upper supporting disc, a rotor support on the inner side of the flywheel upper supporting disc is provided with a permanent magnet of the axial magnetic suspension bearing motor, a stator of the axial magnetic suspension bearing motor is of an iron core-free structure, and a rotor structure is of a double-side structure of a middle stator or a rotor and a double-air-gap structure formed by clamping one rotor disc between two stator discs; the auxiliary bearing is a ceramic bearing.

6. A magnetic levitation flywheel energy storage motor generator as claimed in claim 1, the excircle of the hollow shaft of the stator core is of a step-shaped Y-shaped three-cavity structure with the inner circle thereof, the excircle of the hollow shaft of the stator core comprises a shaft head, a shaft neck, a shaft collar, a shaft body and a stator core support, the shaft head is tubular, the end part of the shaft neck is a spline shaft, the shaft neck is provided with an excircle concave ring groove cooling flow channel shunting through hole and an auxiliary bearing, the inner ring of the auxiliary bearing is tangent with the shaft collar, the shaft body is provided with a plurality of cooling flow passage interfaces which are communicated with a plurality of stator core spiral cooling flow passages, the hollow shaft support of the stator core is provided with a concave key groove, the key groove is intersected and tangent with convex teeth of a plurality of inner circles of the stator core, and the spline shaft is intersected and tangent with the spline shaft sleeve of the machine shell bottom and the machine shell cover; the inner circle of the hollow shaft of the stator core comprises a cavity cooling runner channel, a cavity cable channel and a three-cavity vacuum suction channel, and the cavity cooling runner pipe is provided with a journal excircle concave ring groove cooling runner through hole which is tangent to an interactive interface of the hollow rotating shaft inner circle concave ring groove cooling runner through hole of the flywheel assembly; the two-cavity cable channel is characterized in that a through hole is formed in the two-cavity shaft body, and a stator core winding cable lead penetrates through the through hole and is connected with a power controller; the three-cavity vacuum suction channel is characterized in that a plurality of vacuum suction through holes are formed in the three-cavity shaft body and communicated with an external vacuum extractor, and the hollow shaft of the stator core is made of a non-magnetic metal and carbon fiber resin composite material.

7. A magnetic suspension flywheel energy storage motor generator according to claim 1, 2, 3, 4, 5 or 6, characterized in that the cooling system comprises an integrated structure of a vacuum casing cooling flow channel, a flywheel assembly cooling flow channel, a stator core cooling flow channel, a hollow shaft cooling flow channel of a stator core and an auxiliary bearing cooling flow channel; the cooling flow channel flows in from one end of a first cavity of a hollow shaft head of the stator core, is distributed to an inner circle concave ring groove cooling flow channel through hole of a shaft neck outer circle concave ring groove cooling flow channel of the hollow shaft of the stator core, is distributed to an inner concave ring groove cooling flow channel of a hollow rotating shaft sleeve of the flywheel assembly of the chassis bottom and the chassis cover, and is converged to a cooling flow channel outlet at the other end of the first cavity of the hollow shaft head of the stator core, and a cooling flow channel inlet and a cooling flow channel outlet of the first cavity of the hollow shaft of the stator core are connected with an external radiator and a circulating pump for circulating cooling; wherein the axle journal excircle spill annular cooling runner through-hole of stator core's hollow shaft with the circle spill annular cooling runner through-hole is tangent in the hollow rotating shaft of flywheel assembly, the excircle spill annular cooling runner through-hole of the hollow rotating shaft of flywheel assembly with at the bottom of the casing and the flywheel assembly's of casing cover spill annular cooling runner is tangent.

8. A magnetic suspension flywheel energy storage motor generator as claimed in claim 1, 2 or 3, wherein the self-vacuum pumping device comprises an internal pump body, a pump rotor, a turbine blade, a self-vacuum pumping air outlet, a one-way valve and a vacuum pressure gauge; the built-in pump body is embedded at the inner sides of the machine shell bottom and the machine shell cover, a plurality of self-vacuumizing exhaust holes are arranged at the inner sides of the machine shell bottom and the machine shell cover, the exhaust holes are communicated with external vacuum exhaust outlets of the machine shell bottom and the machine shell cover through a plurality of guide pipes arranged in the machine shell bottom and the machine shell cover, and the vacuum exhaust outlets are provided with one-way valves and vacuum pressure gauges; the hollow rotating shaft step excircle concave-key groove of the flywheel assembly is tangentially intersected with the inner circle convex tooth of the pump rotor and locked by a bolt; the pump rotor and the hollow rotating shaft of the flywheel assembly rotate synchronously; the pump rotor and the turbine blade are made of carbon fiber resin composite materials.

9. A magnetic levitation flywheel energy storage motor generator as claimed in claim 1, 4 or 5, wherein the power controller system comprises an external power supply module, a super capacitor module, a DC-DC/AC step-up and step-down converter, an automatic switching module, a radial and axial magnetic levitation bearing motor control module and a motor/generator drive module and a rectifying and voltage stabilizing module; when an external power supply module supplies power, the current of stator core windings of a motor of the radial and axial magnetic suspension bearing is controlled through PWM to force a flywheel assembly auxiliary bearing to be in radial and axial suspension, then a motor driving module is started, the stator core windings of the motor are conducted, a rotor of the flywheel assembly rotates at a high speed, and at the moment, the flywheel assembly is in an energy storage charging mode; when the rotating speed reaches a preset value, the power supply of the radial and axial magnetic suspension bearing motors is automatically switched to a super capacitor module power supply mode, and the starting enters a flywheel assembly energy maintenance operation mode; when an external load needs energy, the flywheel assembly does work on the generator, a permanent magnet of the generator in the flywheel assembly cuts a stator core winding of the generator to generate induced current, the induced current is rectified and stabilized to output electric energy to a direct current bus, the direct current bus supplies power to a load user, and at the moment, the flywheel assembly is in an energy release and discharge mode; when the rotating speed of the flywheel assembly is gradually reduced to zero, a switch connected with the power controller and an external load is disconnected, the radial and axial magnetic suspension bearing motor control switches are disconnected, and the flywheel assembly completely enters a shutdown mode; wherein part of the electric energy generated by the generator is subjected to voltage reduction through the DC-DC converter to alternately charge the Sc1 and the Sc2 super capacitor module; the Sc1 and Sc2 super capacitor module alternately provides the radial and axial magnetic suspension bearing motors with the flywheel assembly suspension electric energy through the boosting of the DC-DC converter; secondly, the charging and discharging of the Sc1 and Sc2 super capacitor modules are always automatically switched to a state; when the electric quantity of the Sc1 super capacitor module is lower than a preset value, the DC-DC converter is automatically switched to a Sc2 super capacitor module discharging mode, and the Sc1 super capacitor module DC-DC converter is automatically switched to a charging mode.

10. A magnetic levitation flywheel energy storage motor generator as claimed in claim 1, 2, 3, 4, 5 or 6, wherein the vehicles and electrical power generators and assemblies involved in new energy electric drive.