CN113964991B - Motor stator structure of surrounding type secondary winding and fault-tolerant operation - Google Patents

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

A wrap-around secondary winding and a fault-tolerant motor stator structure

technical field

The invention relates to the technical field of motors, in particular to a wrap-around secondary winding and a fault-tolerant motor stator structure.

Background technique

Wrap-around windings are mainly used in the field of high-speed motors. High-speed permanent magnet motors have the advantages of small size, low noise, fast dynamic response, high power density, and high transmission system efficiency. They have become the key motor equipment for the distributed energy supply system of micro gas turbines. In some important fields such as aerospace and military industry, it can also be used as an independent power supply or a small power station to make up for the lack of centralized power supply. Due to its important role and its particularity in emergency and backup, shutdown failure is not allowed, so The reliability and fault-tolerant operation capability of the system are required to be higher. In addition, due to the characteristics of high-speed operation, once the motor fails, it is easy to cause serious accidents and cause huge economic losses. The relevant research on fault-tolerant operation of high-speed motors has become an important means to improve the reliability and safety of high-speed motor systems.

Half of the windings of the wrap-around winding are located on the back of the stator, and the magnetic flux leakage of the windings on the back of the stator is difficult to utilize, which will result in low utilization rate of the windings and adverse effects on the magnetic leakage of the windings. Traditional three-phase winding motors do not continue to operate after a fault, and their reliability is limited. Increasing the number of motor phases, such as five-phase, seven-phase or double-three-phase structure, can increase the redundancy of motor control. After the motor fails, such as one-phase open circuit, there is still enough phase freedom to ensure the operation of the motor. Fault handling buys time. Although this method can ensure that the motor continues to run after the fault, the multi-phase winding motor will increase the control difficulty of the motor and complicate the system, and it is difficult for the multi-phase motor to ensure the high-speed operation of the motor.

The above technical solution discloses some fault-tolerant solutions, but the development of the function of the back winding of the stator yoke is relatively lacking, and it cannot adapt to and solve the problem that half of the windings of the wrap-around winding are located on the back of the stator, resulting in low utilization rate of the winding and adverse effects of magnetic leakage of the winding. , and also cannot achieve adaptive fault-tolerant operation.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a wrap-around secondary winding and a fault-tolerant motor stator structure, which utilizes the secondary winding to store the leakage magnetic energy of the motor to perform storage and discharge to realize the self-fault-tolerant operation of the motor.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A wrap-around secondary winding and a fault-tolerant motor stator structure, comprising a motor casing, a stator core and a wrap-around winding, wherein the motor casing is a layered casing, including an inner-layer casing, and the inner-layer casing is a magnetically conductive The casing; the magnetically conductive casing is connected and fixed with the stator core through the distributed magnetically conductive connecting columns; there are magnetically conductive connecting columns on both sides of each surrounding winding, and the stator core, the magnetically conductive connecting column and the magnetically conductive casing form a magnetic field. road;

An energy storage oscillation device is installed between each surrounding winding and the motor casing; the energy storage oscillation device is an energy storage oscillation circuit composed of a secondary coil winding and a capacitor connection; the secondary coil winding in the energy storage oscillation circuit is surrounded by a magnetically conductive On the casing, and the position corresponds to the winding winding of the motor one-to-one; the capacitor is placed next to the corresponding secondary coil winding.

Further, the motor casing is formed by nesting an inner casing and an outer casing, and the outer casing is a non-magnetically conductive casing.

Further, the inner side of the non-magnetically conductive casing is provided with a slot corresponding to the position of the secondary coil winding.

The beneficial effects of the present invention are:

1. The energy storage oscillating circuit of the present invention utilizes the leakage magnetic field of the motor to store energy, so as to solve the adverse effect of the leakage magnetic field on the motor, thereby improving the utilization rate of the magnetic energy of the motor.

Since the stator core is wound with the wrap-around winding coil, the magnetically conductive casing is wound around the secondary coil winding, and the stator core, the magnetically conductive connecting column, and the magnetically conductive casing form a magnetic circuit, and the leakage magnetic flux will flow from the formed magnetic circuit, so that the magnetic energy and exchange of electrical energy. The magnetic leakage of the surrounding winding is stored in the secondary coil winding of the energy storage oscillator circuit through the constructed magnetic circuit. It can exchange and transfer the magnetic energy and electric energy of the oscillating circuit coil, and finally use its special structure to realize the energy storage and supply for the motor to improve the operation reliability of the motor.

2. Each of the energy storage oscillator circuits of the present invention exists independently, and can perform different degrees of induction according to the magnetic field change of its position, so it can adaptively and dynamically store and release magnetic energy, thereby improving the reliability and self-fault-tolerant operation of the motor.

When the motor is running normally, the magnetic leakage in the surrounding winding coil supplies energy to the secondary coil winding, and the induced magnetic energy and electric energy are stored in the energy storage oscillation circuit, thereby realizing the leakage magnetic energy storage.

When the power supply of the motor fails, the internal magnetic field of the motor is weakened or the magnetic field disappears. At this time, the capacitor in the energy storage oscillation circuit is discharged, and a magnetic field is induced in the secondary coil winding. The absence of the internal magnetic field ensures the operation of the motor, thereby realizing the energy supply of the energy storage oscillator circuit.

When an inter-turn short-circuit fault occurs in the motor winding, the internal magnetic field of the motor changes, and the magnetic energy of the stator core is excessive. At this time, the secondary coil winding can absorb the excess magnetic energy to relieve the saturation of the stator core.

Due to the different operating states of the motors, the internal magnetic field changes are also different, and the secondary coil windings can dynamically induce the magnetic field in real time, so the present invention can perform adaptive operation and dynamically adjust the internal fault magnetic field of the motor according to the magnetic field changes of the motor.

Description of drawings

Fig. 1 is the three-dimensional schematic diagram of the present invention;

Fig. 2 is the front view of the present invention;

Fig. 3 is the enlarged schematic diagram of the position of the energy storage oscillation device in the present invention;

Fig. 4 is the connection schematic diagram of the energy storage oscillator circuit in the present invention;

Fig. 5 is the schematic diagram of the stator core in the present invention;

Fig. 6 is the schematic diagram of the motor casing in the present invention;

Fig. 7 is the normal operation diagram of the present invention;

Fig. 8 is the open circuit fault operation diagram of the present invention;

Fig. 9 is a certain phase open circuit operation diagram of the present invention;

FIG. 10 is a short-circuit operation diagram of the present invention.

Detailed ways

The specific implementation of this embodiment will be described in detail below with reference to the accompanying drawings. The arrows in FIG. 7 , FIG. 8 , FIG. 9 and FIG. 10 are schematic diagrams of the direction of the magnetic field.

As shown in FIGS. 1 to 6 , the present embodiment discloses a surrounding secondary winding and a fault-tolerant motor stator structure, including a motor casing, a stator core 2 and a surrounding winding 1 .

The motor casing is a layered casing, which consists of an inner casing and an outer casing. The non-magnetically conductive casing 5 made of material; the magnetically conductive casing 4 is connected and fixed with the stator core 2 through the distributed magnetically conductive connecting columns 3 .

There are magnetically conductive connecting columns 3 on both sides of each wrap-around winding 1 , and the stator core 2 , the magnetically conductive connecting columns 3 and the magnetically conductive casing 4 form a magnetic circuit.

An energy storage oscillating device is installed between each surrounding winding 1 and the motor casing, respectively; The secondary coil winding 7 in the energy storage oscillator circuit is wound on the magnetically permeable casing 4, and its position is in one-to-one correspondence with the surrounding winding 1 of the motor; the capacitor 8 is placed beside the corresponding secondary coil winding 7.

Slots 6 are provided on the inner side of the non-magnetically conductive casing 5 at positions corresponding to the secondary coil windings 7 .

The working principle of the present invention is as follows:

In the wraparound winding, half of the windings are in the stator back slot, and the back winding will also generate a strong magnetic leakage magnetic field. Each stator back slot is placed with a corresponding oscillating energy storage circuit, and the secondary coil winding 7 is wound around the magnetically conductive On the casing 4, the magnetically conductive casing 4 is connected with the motor stator core 2 by the magnetically conductive connecting column 3, so that the magnetically conductive casing 4, the magnetically conductive connecting column 3 and the stator core 2 form a magnetic circuit, and the magnetic leakage is induced by the flow of the magnetic circuit. The secondary coil winding 7 generates electrical energy, which is stored in the capacitor 8 . The structure enables magnetic energy exchange between the wrap-around winding and the secondary coil winding, and the induced electric energy is stored in the oscillating energy storage circuit energy.

The energy storage oscillation circuit includes the secondary coil winding and the capacitor. Since the secondary coil winding can be equivalent to an inductive element, the circuit composition is also equivalent to the connection of the inductive and capacitive elements. The discharge oscillation frequency formula is:

Among them, L is the inductance and C is the capacitance. The discharge oscillation frequency is only related to L and C in the circuit, and a specific value is given to it, so that the discharge oscillation frequency and the motor operating frequency will be consistent.

As shown in Figure 7, in the case of the motor, the motor is running normally, and the wrap-around winding coil is normally connected to the power supply, and its back will generate magnetic flux leakage. The wires are stored in the capacitor 8. At this time, the same frequency voltage and current will be generated in the oscillating energy storage circuit and stored in the circuit.

As shown in Figure 8, when a power failure occurs suddenly during the operation of the motor, all the surrounding windings are disconnected, and the energy storage oscillator circuit begins to supply energy, providing a voltage with the same frequency and the same phase as the winding. At this time, the current direction and the original winding current In the same direction, the magnetic field in the same direction is generated and injected into the main magnetic circuit of the motor, which can prolong the running time of the motor, alleviate the stall caused by the sudden power failure of the motor, realize emergency energy supply, and carry out fault-tolerant operation of the motor.

As shown in Figure 9, when the winding of the motor coil is disconnected at a certain position and the motor is running without phase, it will cause three-phase asymmetric operation, which will cause the motor to fail and cannot run. At this time, due to the winding at a certain position If it is missing, the secondary winding coil of the energy storage oscillation circuit at the corresponding position starts to supply energy, provides a voltage of the same frequency and the same phase as the winding, generates a magnetic field in the same direction, and injects it into the main magnetic circuit of the motor, which can prolong the running time of the motor and alleviate the phase failure of the motor. The resulting asymmetric operation enables emergency power supply and fault-tolerant operation of the motor.

As shown in Figure 10, when there is a short-circuit between turns of the windings in a certain position of the motor, a large short-circuit current will be generated, resulting in a magnetic field, causing serious local saturation and heating of the motor, which seriously affects the safe operation of the motor. At this time, due to the magnetic permeability The existence of the connecting column and the magnetic circuit of the magnetic conductive casing can transfer a large amount of magnetic energy to the secondary coil winding at its corresponding position, induce the electric energy to be stored in the circuit, relieve the local magnetic field of the motor, enable the motor to continue to run, and provide protection measures. time, greatly reducing damage.

To sum up, the energy storage oscillation circuit of the present invention utilizes the leakage magnetic field of the motor to store energy, solves the adverse effect of the leakage magnetic field on the motor, and improves the utilization rate of the magnetic energy of the motor.

Each of the energy storage oscillator circuits of the present invention exists independently, and can perform different degrees of induction according to the change of the magnetic field at its position, so it can adaptively and dynamically store and release magnetic energy, thereby improving the reliability and fault tolerance of the motor.

The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without departing from the Any modification or partial replacement of the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

If words such as "first" and "second" are used herein to define components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the present invention and simplifying the description , unless otherwise stated, the above terms have no special meaning.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. are based on those shown in the accompanying drawings The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated for a specific orientation, and therefore should not be construed as protecting the content of the present invention limits.

Claims (3)

1. the motor stator structure of a wrap-around secondary winding and fault-tolerant operation, comprising a motor casing, a stator core and a wrap-around winding, it is characterized in that: the motor casing is a layered casing, comprising an inner casing, an inner casing. The layer casing is a magnetic conductive casing; the magnetic conductive casing is connected and fixed with the stator core through the distributed magnetic conductive connecting columns; there are magnetic conductive connecting columns on both sides of each wrap-around winding, and the stator core and the magnetic conductive connecting column are connected to the stator core and the magnetic conductive connecting column. The magnetic conductive casing constitutes a magnetic circuit; An energy storage oscillation device is installed between each surrounding winding and the motor casing; the energy storage oscillation device is an energy storage oscillation circuit composed of a secondary coil winding and a capacitor connection; the secondary coil winding in the energy storage oscillation circuit is surrounded by a magnetically conductive On the casing, and the position corresponds to the winding winding of the motor one-to-one; the capacitor is placed next to the corresponding secondary coil winding; When the motor is running normally and the wrap-around winding coil is normally connected to the power supply, magnetic flux leakage will occur on its back, and the changing magnetic flux leakage will pass through the magnetic circuit to induce electric energy in the secondary coil winding, which will be stored in the capacitor through the coil wire. The same frequency voltage and current will be generated in the energy circuit and stored in the circuit; When a power failure occurs suddenly during the operation of the motor, all the surrounding windings are disconnected, and the energy storage oscillator circuit starts to supply energy, providing a voltage of the same frequency and the same phase as the windings. The directional magnetic field is injected into the main magnetic circuit of the motor; When the winding of the motor coil is disconnected and faulty at a certain position, the motor runs in phase loss at this time. At this time, due to the missing winding at a certain position, the secondary winding coil of the energy storage oscillator circuit at the corresponding position starts to supply energy, providing the same frequency and with the same frequency. The voltage of the same phase of the winding generates the magnetic field in the same direction, which is injected into the main magnetic circuit of the motor; When there is a short-circuit between turns of the windings in a slot of the motor, a short-circuit current will be generated, thereby generating a magnetic field. At this time, due to the existence of the magnetically conductive connecting column and the magnetic circuit of the magnetically conductive casing, the magnetic energy can be transferred to the secondary coil winding at its corresponding position. , the induced energy is stored in the circuit. 2. The motor stator structure of the surrounding secondary winding and fault-tolerant operation according to claim 1, wherein the motor casing is formed by nesting an inner casing and an outer casing, and the outer casing is Non-magnetic case. 3 . The wrap-around secondary winding and the motor stator structure for fault-tolerant operation according to claim 2 , wherein the inner side of the non-magnetically conductive casing and the corresponding positions of the secondary coil windings are provided with slots. 4 .

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