CN113964991B - Motor stator structure of surrounding type secondary winding and fault-tolerant operation - Google Patents
Motor stator structure of surrounding type secondary winding and fault-tolerant operation Download PDFInfo
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- CN113964991B CN113964991B CN202111345508.1A CN202111345508A CN113964991B CN 113964991 B CN113964991 B CN 113964991B CN 202111345508 A CN202111345508 A CN 202111345508A CN 113964991 B CN113964991 B CN 113964991B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/42—Means for preventing or reducing eddy-current losses in the winding heads, e.g. by shielding
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/0094—Structural association with other electrical or electronic devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
Abstract
The invention discloses a motor stator structure with a surrounding type secondary winding and fault-tolerant operation, which comprises a motor shell, a stator core and a surrounding type winding, wherein the motor shell is a layered shell and comprises an inner-layer shell, and the inner-layer shell is a magnetic conduction shell; the magnetic conduction machine shell is connected and fixed with the stator core through distributed magnetic conduction connecting columns; both sides of each surrounding type winding are provided with magnetic conduction connecting columns, and the stator core, the magnetic conduction connecting columns and the magnetic conduction machine shell form a magnetic circuit; energy storage oscillation devices are respectively arranged between each surrounding winding and the motor shell; the energy storage oscillation device is an energy storage oscillation circuit formed by connecting an auxiliary coil winding and a capacitor; the secondary coil windings in the energy storage oscillation circuit are wound on the magnetic conduction shell in a surrounding mode, and the positions of the secondary coil windings are in one-to-one correspondence with the surrounding windings of the motor; the capacitors are placed next to the corresponding secondary winding. The invention utilizes the secondary winding to store the magnetic flux leakage energy of the motor, stores and discharges, and realizes the self-fault-tolerant operation of the motor.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor stator structure with a surrounding type secondary winding and fault-tolerant operation.
Background
The high-speed permanent magnet motor has the advantages of small size, low noise, quick dynamic response, high power density, high transmission system efficiency and the like, becomes key motor equipment of a micro gas turbine distributed energy supply system, is commonly used in important fields of aerospace, military industry and the like, can also be used as an independent power supply or a small power station to make up the deficiency of centralized power supply, and has higher requirements on the reliability and fault-tolerant operation capability of the system because of the important function of the high-speed permanent magnet motor and the particularity in the aspects of emergency and standby without allowing shutdown faults. In addition, due to the characteristic of high-speed operation, once the motor breaks down, serious accidents are easily caused, huge economic losses are caused, and related researches on fault-tolerant operation of the high-speed motor become important means for improving the reliability and safety of a high-speed motor system.
Half winding of surrounding type winding is located the stator back, and the winding magnetic leakage at stator back is difficult to utilize, can cause the winding low-usage and the winding magnetic leakage can produce adverse effect. The conventional three-phase winding motor cannot continuously maintain operation after a fault, and the reliability is limited. The method can ensure that the motor continues to operate after the fault, but the multiphase winding motor can increase the control difficulty of the motor, so that the system is complicated, and the multiphase motor is difficult to ensure the high-speed operation of the motor.
The technical scheme discloses some fault-tolerant schemes, but the development of the back winding function of the stator yoke is relatively deficient, the fault-tolerant operation method cannot adapt to and solve the problems that the utilization rate of the winding is low and the magnetic leakage of the winding can generate adverse effects because half of the winding of the surrounding winding is positioned on the back of the stator, and cannot realize self-adaptive fault-tolerant operation.
Disclosure of Invention
The invention aims to provide a motor stator structure with a surrounding type secondary winding and fault-tolerant operation, which utilizes the secondary winding to store and discharge magnetic leakage energy of a motor and realizes the self-fault-tolerant operation of the motor.
In order to solve the technical problems, the invention adopts the following technical scheme:
a motor stator structure with a surrounding type secondary winding and fault-tolerant operation comprises a motor shell, a stator core and a surrounding type winding, wherein the motor shell is a layered shell and comprises an inner-layer shell, and the inner-layer shell is a magnetic conduction shell; the magnetic conduction machine shell is connected and fixed with the stator core through distributed magnetic conduction connecting columns; both sides of each surrounding type winding are provided with magnetic conduction connecting columns, and the stator iron core, the magnetic conduction connecting columns and the magnetic conduction machine shell form a magnetic circuit;
energy storage oscillation devices are respectively arranged between each surrounding type winding and the motor shell; the energy storage oscillation device is an energy storage oscillation circuit formed by connecting a secondary coil winding and a capacitor; the secondary coil windings in the energy storage oscillation circuit are wound on the magnetic conduction shell in a surrounding mode, and the positions of the secondary coil windings are in one-to-one correspondence with the surrounding windings of the motor; the capacitors are placed beside the corresponding secondary winding.
Furthermore, the motor shell is formed by nesting an inner shell and an outer shell, and the outer shell is a non-magnetic shell.
Furthermore, the inner side of the non-magnetic conductive casing and the position corresponding to the secondary coil winding are provided with slots.
The invention has the beneficial effects that:
1. the energy storage oscillation circuit stores energy by utilizing the leakage flux of the motor, solves the adverse effect of the leakage flux on the motor, and improves the utilization rate of the magnetic energy of the motor.
The stator core is wound with the surrounding winding coil, the magnetic conduction casing is wound with the secondary coil winding, the stator core, the magnetic conduction connecting column and the magnetic conduction casing form a magnetic circuit, and leakage flux can circulate from the formed magnetic circuit, so that magnetic energy and electric energy are exchanged. The magnetic leakage of the surrounding winding is stored in the secondary winding of the energy storage oscillating circuit through the constructed magnetic circuit, and the electric energy generated by induction is stored in the capacitor of the energy storage oscillating circuit, so that the exchange and transmission of the magnetic energy and the electric energy of the surrounding winding coil and the energy storage oscillating circuit coil are realized, and finally, the special structure is utilized to realize the improvement of the running reliability of the motor for energy storage and energy supply of the motor.
2, each energy storage oscillation circuit of the invention exists independently, and can carry out induction of different degrees according to the magnetic field change of the position, thereby being capable of storing and releasing magnetic energy in a self-adaptive dynamic way, and further improving the running reliability and self-fault-tolerant running of the motor.
When the motor normally operates, the magnetic flux leakage in the surrounding winding coil supplies energy to the secondary coil winding, and magnetic energy and electric energy generated by induction are stored in the energy storage oscillating circuit, so that magnetic flux leakage and energy storage are realized.
When the power supply of the motor fails, the magnetic field in the motor is weakened or disappears, the capacitor in the energy storage oscillation circuit discharges, a magnetic field is induced in the secondary coil winding, the magnetic field is injected into the stator core through the magnetic circuit, the main magnetic circuit of the motor is supplemented with the magnetic field, the magnetic field loss in the motor is relieved, the motor operation is guaranteed, and therefore the energy storage oscillation circuit is powered.
When the turn-to-turn short circuit fault occurs in the motor winding, the magnetic field inside the motor changes, the magnetic energy of the stator core is excessive, and the auxiliary coil winding can absorb the excessive magnetic energy to relieve the saturation of the stator core.
Because the running states of the motor are different, the change of the internal magnetic field is also different, and the secondary coil winding can dynamically induce the magnetic field in real time, the self-adaptive running dynamic regulation of the internal fault magnetic field of the motor can be carried out according to the change of the magnetic field of the motor.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is an enlarged schematic view of a portion of the energy storage oscillation device of the present invention;
FIG. 4 is a schematic diagram of the connection of the tank oscillator circuit of the present invention;
FIG. 5 is a schematic view of a stator core of the present invention;
FIG. 6 is a schematic view of a motor housing according to the present invention;
FIG. 7 is a normal operating diagram of the present invention;
FIG. 8 is a circuit break fault operating diagram of the present invention;
FIG. 9 is a schematic diagram of the open circuit operation of one phase of the present invention;
fig. 10 is a short circuit operation diagram of the present invention.
Detailed Description
The following detailed description is made with reference to the accompanying drawings of the present embodiment, and the arrows in fig. 7, 8, 9 and 10 are magnetic field direction diagrams.
As shown in fig. 1 to 6, the present embodiment discloses a wound secondary winding and fault-tolerant operation motor stator structure, which includes a motor casing, a stator core 2 and a wound winding 1.
The motor shell is a layered shell and is formed by nesting an inner-layer shell and an outer-layer shell, the inner-layer shell is a magnetic conduction shell 4 made of a magnetic conduction material, and the outer-layer shell is a non-magnetic conduction shell 5 made of a common non-magnetic conduction material; the magnetic conduction machine shell 4 is connected and fixed with the stator iron core 2 through the distributed magnetic conduction connecting columns 3.
Both sides of each surrounding type winding 1 are provided with magnetic conduction connecting posts 3, and the stator iron core 2, the magnetic conduction connecting posts 3 and the magnetic conduction machine shell 4 form a magnetic circuit.
Energy storage oscillation devices are respectively arranged between each surrounding type winding 1 and the motor shell; the energy storage oscillation device is an energy storage oscillation circuit formed by connecting a secondary coil winding 7 and a capacitor 8. The secondary coil winding 7 in the energy storage oscillation circuit is wound on the magnetic conduction shell 4, and the positions of the secondary coil winding are in one-to-one correspondence with the surrounding windings 1 of the motor; the capacitors 8 are placed next to the corresponding secondary winding 7.
The inner side of the non-magnetic conductive casing 5 is provided with a slot 6 corresponding to the secondary coil winding 7.
The working principle of the invention is as follows:
in the surrounding type winding, half of the winding is arranged in a stator back groove, the back winding can also generate a strong magnetic leakage magnetic field, a corresponding oscillation energy storage circuit is placed in each stator back groove, the secondary coil winding 7 is wound on the magnetic conduction machine shell 4, the magnetic conduction machine shell 4 is connected with the magnetic conduction connecting column 3 and the motor stator iron core 2, the magnetic conduction machine shell 4, the magnetic conduction connecting column 3 and the stator iron core 2 form a magnetic circuit, and the magnetic leakage inducts the secondary coil winding 7 to generate electric energy through the magnetic circuit circulation and stores the electric energy in the capacitor 8. The structure enables magnetic energy of the surrounding winding and the secondary winding to be exchanged, and electric energy generated by induction is stored in the oscillation energy storage circuit.
The energy storage oscillation circuit comprises a secondary coil winding and a capacitor, and as the secondary coil winding can be equivalent to an inductance element, the circuit composition is also equivalent to the connection of the inductance element and the capacitor element, and the discharge oscillation frequency formula is as follows:
wherein L is inductance, C is capacitance, and the discharge oscillation frequency is only related to L, C in the circuit, and is given a specific value, so that the discharge oscillation frequency of the discharge oscillation frequency is consistent with the running frequency of the motor.
As shown in fig. 7, under the condition of the motor, the motor operates normally, the winding type winding coil is normally connected to the power supply, leakage flux is generated at the back of the winding type winding coil, the changed leakage flux passes through the magnetic circuit, electric energy is induced and generated in the secondary winding coil 7, the electric energy is stored in the capacitor 8 through the coil conducting wire, and at the moment, same-frequency voltage and current can be generated in the oscillation energy storage circuit and stored in the circuit.
As shown in fig. 8, when the motor suddenly breaks down, all the surrounding windings are open, the energy storage oscillating circuit starts to supply energy, and provides voltage with the same frequency and the same phase as the windings, and at this time, the current direction is the same as the current direction of the primary winding, so as to generate a magnetic field with the same direction, and the magnetic field is injected into the main magnetic circuit of the motor, so that the running time of the motor can be prolonged, the stalling of the motor caused by the sudden break down fault is relieved, the emergency energy supply is realized, and the fault-tolerant operation of the motor is performed.
As shown in fig. 9, when a winding in a slot at a certain position in a winding of a coil of a motor fails to break, the motor operates in a phase-lacking manner, and three-phase asymmetric operation is caused, so that the motor fails to operate.
As shown in fig. 10, when the inter-turn short circuit occurs in the winding in the slot at a certain position of the motor, a large short-circuit current is generated, so that a magnetic field is generated, which causes severe local saturation, the motor generates heat, and the safe operation of the motor is seriously affected.
In conclusion, the energy storage oscillation circuit stores energy by utilizing the leakage flux of the motor, solves the adverse effect of the leakage flux on the motor, and improves the utilization rate of the magnetic energy of the motor.
The energy storage oscillation circuits of the invention are independent and can carry out induction in different degrees according to the magnetic field change of the position of the energy storage oscillation circuits, thereby being capable of storing and releasing magnetic energy in a self-adaptive dynamic manner, and further improving the running reliability and self-fault-tolerant performance of the motor.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the use of "first" and "second" is merely for convenience in describing the invention and to simplify the description, and unless otherwise stated the above words are not intended to have a special meaning.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
Claims (3)
1. The utility model provides a motor stator structure of wound form secondary winding and fault-tolerant operation, includes motor housing, stator core and wound form winding, its characterized in that: the motor shell is a layered shell and comprises an inner-layer shell, and the inner-layer shell is a magnetic conduction shell; the magnetic conduction machine shell is connected and fixed with the stator core through distributed magnetic conduction connecting columns; both sides of each surrounding type winding are provided with magnetic conduction connecting columns, and the stator core, the magnetic conduction connecting columns and the magnetic conduction machine shell form a magnetic circuit;
energy storage oscillation devices are respectively arranged between each surrounding type winding and the motor shell; the energy storage oscillation device is an energy storage oscillation circuit formed by connecting an auxiliary coil winding and a capacitor; the secondary coil windings in the energy storage oscillation circuit are wound on the magnetic conduction shell in a surrounding mode, and the positions of the secondary coil windings are in one-to-one correspondence with the surrounding windings of the motor; the capacitors are arranged beside the corresponding secondary coil windings;
when the motor normally runs, the surrounding winding coil is normally connected with a power supply, magnetic leakage can be generated at the back of the surrounding winding coil, electric energy is induced in the secondary winding coil through the magnetic circuit due to the changed magnetic leakage, the electric energy is stored in the capacitor through the coil wire, and at the moment, the same-frequency voltage and current can be generated in the oscillation energy storage circuit and stored in the circuit;
when the motor suddenly breaks down when running, all the surrounding windings are broken, the energy storage oscillation circuit starts to supply energy and provides voltage with the same frequency and the same phase as the windings, and the current direction is the same as the current direction of the primary winding at the moment, so that magnetic fields in the same direction are generated and injected into a main magnetic circuit of the motor;
when a winding in a certain position of a coil winding of the motor is disconnected and fails, the motor runs in a phase-lacking mode, and at the moment, because the winding in the certain position is lacked, a secondary winding coil of the energy storage oscillating circuit at a corresponding position starts to supply energy, voltage with the same frequency and the same phase as the winding is provided, a magnetic field in the same direction is generated, and the magnetic field is injected into a main magnetic circuit of the motor;
when the turn-to-turn short circuit of the winding in the slot at a certain position of the motor occurs, short-circuit current is generated, so that a magnetic field is generated, magnetic energy can be transmitted to the auxiliary coil winding at the corresponding position due to the existence of the magnetic conductive connecting column and the magnetic circuit of the magnetic conductive shell, and induced electric energy is stored in the circuit.
2. The wound secondary and fault tolerant operation motor stator structure of claim 1, wherein: the motor shell is formed by nesting an inner shell and an outer shell, and the outer shell is a non-magnetic shell.
3. The wound secondary and fault tolerant operation motor stator structure of claim 2, wherein: and the inner side of the non-magnetic conductive casing and the position corresponding to the secondary coil winding are provided with slots.
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| CN202111345508.1A CN113964991B (en) | 2021-11-15 | 2021-11-15 | Motor stator structure of surrounding type secondary winding and fault-tolerant operation |
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| CN202111345508.1A CN113964991B (en) | 2021-11-15 | 2021-11-15 | Motor stator structure of surrounding type secondary winding and fault-tolerant operation |
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| CN113964991A CN113964991A (en) | 2022-01-21 |
| CN113964991B true CN113964991B (en) | 2022-09-13 |
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