CN104242521A - Double-mode electric power generator - Google Patents

Abstract

The invention provides a double-mode electric power generator which comprises a rotor iron core (7), a stator iron core (8), coils, a shaft, a shell and the like. The double-mode electric power generator has a body structure as simple and reliable as that of a switch reluctance motor, some of the coils are armature coils, some of the coils can be used as armature coils and can also be used as excitation coils, and due to the novel coil structure, the power generator can run in a mode of being the switch reluctance motor and can run in a mode of being an electric excitation double-salient-pole motor. A controller can automatically select working modes according to different working environments, and advantages of the switch reluctance motor and an electric excitation double-salient-pole power generator can be utilized comprehensively. The double-mode electric power generator is highly suitable for serving as a starting power generator for an automobile and an automobile driving motor, works in a switch reluctance motor mode during electromotion and works in an electric excitation double-salient-pole motor mode during power generation.

Description

A dual-mode motor generator

technical field

The invention relates to a dual-mode motor generator, which belongs to the technical field of motors and electrical appliances.

Background technique

A motor-generator can operate both as a motor and as a generator. Motors such as starter motors and drive motors for automobiles should have these two functions to supply power to electrical equipment after starting, or to recover braking energy after driving the car.

At present, there are some applications of motor generators using permanent magnet synchronous motors at home and abroad. However, permanent magnet motors do not have the ability to quickly demagnetize. When switching loads or encountering major faults, the system will generate large voltage fluctuations, which may cause damage to other components. Therefore, the permanent magnet generator needs to be connected with an additional fault protection circuit, which increases the system cost.

The switched reluctance motor has a large torque at low speed, and is suitable for running as a motor such as a starter. However, when it operates as a generator, it needs to use the armature winding to energize and excite, so its power generation state is a pulse output, which requires a high-cost rectification and filtering circuit.

The electric excitation doubly salient motor has a separate excitation winding, which can easily maintain the stability of the output voltage by adjusting the magnitude of the excitation current. However, in electric operation, its energy conversion efficiency and power density are lower than those of switched reluctance motors.

Therefore, it will be of great value to propose a dual-mode motor-generator that can operate in both switched reluctance machine mode and double-saliency generator mode.

In the current existing technologies, the concept of dual-mode is mostly used in the fields of gasoline-electric hybrid vehicles and communication engineering. For example, the invention patent with the application number of 201310410243.8: planetary dual-mode oil-electric hybrid system provides a hybrid vehicle that can be driven by an internal combustion engine or an electric motor. The dual-mode concept is also used in some motor control technologies, such as the authorized invention patent: dual-mode control method in the initial stage of synchronous motor frequency conversion start-up, patent number: 201110314494.7, which provides an open-loop control method in the initial stage, The double-mode control method of closed-loop control is adopted in the normal operation stage, which is applied to synchronous motors. Authorized utility model patent: brushless DC motor dual-mode operation conversion controller, authorization number ZL201320241906.3, through the use of two control methods, two control modes are realized in the normal state of the motor and the faulty state of the position sensor. At present, the applicant has not found a patent for a new type of motor that realizes the operation of two different types of motor modes by switching windings and control methods.

The technology disclosed in the present invention proposes the concept of a dual-mode motor that can operate in a doubly salient motor operating mode and a switched reluctance motor operating mode, and for this emerging concept, a new winding configuration method is provided to realize Dual mode work. This dual-mode motor is ideal for use as a motor-generator. the

Contents of the invention

The invention proposes a dual-mode motor generator, which works according to the principle of the switched reluctance motor when operating as a switched reluctance motor mode; works according to the principle of an electrically excited double salient pole motor when operating as an electric excitation double salient pole motor of.

The present invention adopts following technical scheme:

A dual-mode motor generator, comprising a rotor core (7), a stator core (8), a coil, a shaft and a housing, etc., characterized in that the number of poles of the rotor core (7) is 4N, and the number of poles of the stator core (8) is 6N , N is a natural number; each stator pole is wound with a concentrated coil with the same winding direction, and the coil on the xth pole in the circumferential order is named as the xth coil in turn, and x is a natural number;

When the dual-mode motor generator is in the switched reluctance motor working mode, the connection mode of each coil is the same as that of the traditional switched reluctance motor, that is, the coil with a remainder of 1 in x/6 and the coil with a remainder of 4 in x/6 A-phase windings are formed in series or in parallel, coils with a remainder of 2 in x/6 and coils with a remainder of 5 in x/6 are connected in series or in parallel to form phase B windings, coils with a remainder of 3 in x/6 and coils with a remainder of 6 in x/6 The C-phase windings are formed in series or in parallel, and each phase winding is connected to an asymmetrical half-bridge to operate in the working mode of the switched reluctance motor;

When the dual-mode motor-generator is in the double salient motor working mode, the excitation winding is composed of a coil with a remainder of 2 in x/6, a coil with a remainder of 4 in x/6, and a coil with a remainder of 6 in x/6 in series or in parallel , the coils with a remainder of x/6 of 1 form the phase A winding, the coils of x/6 with a remainder of 3 form the phase C winding, and the coils with a remainder of x/6 of 5 form the phase B winding, phase A, and phase C One end of phase B winding and phase B winding are respectively connected to the neutral point of the three bridge arms of the three-phase rectifier bridge, and the other ends of phase A winding, phase C winding and phase B winding are connected together as the neutral point, and the double salient pole motor works mode operation;

The dual-mode motor-generator, when working in the switched reluctance motor mode, can operate as both a motor and a generator; machine running. the

A dual-mode motor generator as described above is characterized in that each coil is composed of several sub-coils connected in series or in parallel, and when the coil is used as an excitation winding, each sub-coil is connected in series to obtain a higher excitation The number of winding turns; when the coil is used as an armature winding, each sub-coil is connected in parallel to reduce the internal resistance of the armature winding.

A dual-mode motor-generator as described above is characterized in that: the dual-mode motor-generator is used as a starter generator for automobiles, and works in the switched reluctance motor mode when starting; works in the electrically excited double salient pole motor mode when generating power. In the working mode, the excitation winding is energized and the air gap magnetic field can be controlled by controlling the magnitude of the excitation current to maintain the stability of the output voltage.

A dual-mode motor-generator as described above is characterized in that: the dual-mode motor-generator is used as a driving motor for automobiles, works in the switched reluctance motor mode when driving the automobile, and works in the electric excitation dual motor mode when recovering braking energy. Salient pole motor working mode.

The beneficial effects of the present invention are as follows:

(1) The present invention proposes a dual-mode motor generator, which can operate as a switched reluctance motor and as an electrically excited double-salient motor. The working mode can be independently selected according to different working environments, and the switch can be used comprehensively. Advantages of reluctance motors and electrically excited doubly salient motors;

(2) A dual-mode motor generator of the present invention is very suitable as a starter generator for automobiles. It works in the switched reluctance motor mode when starting; it works in the electric excitation double salient pole motor mode when generating electricity, and energizes the excitation winding and controls the The magnitude of the excitation current can control the air gap magnetic field to keep the output voltage stable;

(3) A dual-mode motor-generator of the present invention is also very suitable as a drive motor for automobiles. It works in the switched reluctance motor mode when driving the car, and works in the electric excitation double salient motor mode when braking energy is recovered;

(4) A dual-mode motor generator of the present invention is also suitable for use as a fault-tolerant motor. When one working mode cannot work normally but the second mode can work, it will switch to the second mode to work.

Description of drawings

Fig. 1 is a cross-sectional view of an embodiment of a dual-mode motor generator of the present invention, the number of poles of the stator and the rotor is 6 poles and 4 poles respectively. Among them: 1. The first coil; 2. The second coil; 3. The third coil; 4. The fourth coil; 5. The fifth coil; 6. The sixth coil; 7. The rotor core; 8. The stator core.

Fig. 2 is the first embodiment of the switched reluctance mode coil connection of the dual-mode motor-generator of the present invention.

Fig. 3 is a second embodiment of the coil connection of the switched reluctance mode of the dual-mode motor-generator of the present invention.

Fig. 4 is a third embodiment of the coil connection of the switched reluctance mode of the dual-mode motor-generator of the present invention.

Fig. 5 is the first embodiment of the doubly salient mode coil connection of the dual mode motor generator of the present invention.

Fig. 6 is a second embodiment of the doubly salient mode coil connection of the dual mode motor generator of the present invention.

Detailed ways

The invention will be described in further detail below in conjunction with the accompanying drawings.

A kind of dual-mode motor generator of the present invention shown in Fig. 1 comprises rotor iron core (7), stator iron core (8), coil, shaft and shell etc., rotor iron core (7) pole number is 4N, stator iron core (8) The number of poles is 6N, and N=1 in this embodiment. Concentrated coils with the same winding direction are wound on each stator pole, and the circumferential order is respectively the first coil, the second coil, the third coil, the fourth coil, the fifth coil and the sixth coil.

Fig. 2 is the first embodiment of the switched reluctance mode coil connection of the dual-mode motor-generator of the present invention. The first coil and the fourth coil are connected in series to form the A-phase winding, the second coil and the fifth coil are connected in series to form the B-phase winding, the third coil and the sixth coil are connected in series to form the C-phase winding, and each phase winding can be connected to an asymmetrical half bridge. Operates in switched reluctance motor operating mode.

Fig. 3 is a second embodiment of the coil connection of the switched reluctance mode of the dual-mode motor-generator of the present invention. The first coil and the fourth coil are connected in parallel to form the A-phase winding, the second coil and the fifth coil are connected in parallel to form the B-phase winding, the third coil and the sixth coil are connected in parallel to form the C-phase winding, and each phase winding can be connected to an asymmetrical half bridge. Operates in switched reluctance motor operating mode.

Fig. 4 is a third embodiment of the coil connection of the switched reluctance mode of the dual-mode motor-generator of the present invention. Each coil is tapped from the middle to form two sub-coils, and the two sub-coils are connected in parallel and then connected in parallel or in series with the coil of the same phase to form a phase winding. This connection method effectively reduces the total number of series turns of each phase coil.

Fig. 5 is the first embodiment of the doubly salient mode coil connection of the dual mode motor generator of the present invention. The excitation winding is composed of the second coil, the fourth coil and the sixth coil in series, the A-phase winding is composed of the first coil, the B-phase winding is composed of the third coil, and the C-phase winding is composed of the fifth coil. One end of the winding and the C-phase winding are respectively connected to the neutral point of the three bridge arms of the three-phase rectifier bridge, and the other ends of the A-phase winding, B-phase winding and C-phase winding are connected together as the neutral point, and the motor can be double-convex Pole motor work mode operation.

Fig. 6 is a second embodiment of the doubly salient mode coil connection of the dual mode motor generator of the present invention. The excitation winding is composed of the second coil, the fourth coil and the sixth coil in series. The middle tap of the first coil forms two sub-coils which are then connected in parallel to form an A-phase winding. The middle tap of the third coil forms two sub-coils which are then connected in parallel to form a B-phase winding. Three-five coils are tapped in the middle to form two sub-coils and then connected in parallel to form a C-phase winding. One end of the A-phase winding, B-phase winding and C-phase winding are respectively connected to the neutral point of the three bridge arms of the three-phase rectifier bridge. The A-phase winding, C-phase winding The other end of the phase winding and the B-phase winding are connected together as a neutral point, and the motor can operate in a doubly salient motor working mode.

In this embodiment, the coils serving as the excitation winding are connected in series, so that a higher number of turns of the excitation winding can be obtained. Each sub-coil used as the armature winding is connected in parallel to reduce the internal resistance of the armature winding.

The motor-generator of the present invention, when working in the mode of switched reluctance motor, can run as both a motor and a generator; when working in the mode of an electrically excited double salient pole motor, it can also run as a motor and as a generator run.

The working principle of the dual-mode motor generator of the present invention is the same as that of the switched reluctance motor when it works in the switched reluctance mode, and the same as that of the electrically excited double salient pole motor when it works in the electrically excited double salient pole mode. The technology of the invention can comprehensively utilize the advantages of the switched reluctance motor and the electric excitation double salient pole generator.

The basic principle of the dual-mode starter-generator technology of the present invention is based on that both the doubly salient pole motor and the switched reluctance motor have a doubly salient pole stator-rotor structure, but the difference lies in the difference in the excitation mode; and the doubly salient pole motor and the switched reluctance motor Both electric machines can be operated as both generators and motors.

The technology of the present invention has a high application prospect, which is mainly manifested in the following aspects.

A dual-mode motor generator of the present invention can be used as a starter generator for automobiles, and works in the switched reluctance motor mode when starting; works in the electric excitation double salient pole motor working mode when generating electricity, energizes the excitation winding and controls the excitation The magnitude of the current can control the air gap magnetic field to keep the output voltage stable.

The dual-mode motor generator of the present invention is used as a driving motor for automobiles, works in the switched reluctance motor mode when driving the automobile, and works in the electric excitation double salient motor mode when recovering braking energy.

The dual-mode motor generator of the present invention can be used as a fault-tolerant motor for automobiles. When one working mode cannot work normally but the second mode can work, it will switch to the second mode to work. But this way needs to configure the controller of two kinds of motors.

It should be pointed out that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of All changes and replacements should fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (4)

1. a bimodulus motor generator, comprise rotor core (7), stator core (8), coil, axle and shell etc., it is characterized in that rotor core (7) number of poles is 4N, stator core (8) number of poles is 6N, N is natural number; Each stator poles is wound with the centralized coil in identical coiling direction, successively by the coil called after xth coil that circumferential order xth extremely goes up, x is natural number;

When described bimodulus motor generator is in switched reluctance machines mode of operation, each coil connected mode identical with traditional switched reluctance machines, namely x/6 remainder be 1 coil and x/6 remainder be the coils connected in series of 4 or compose in parallel A phase winding, x/6 remainder be 2 coil and x/6 remainder be the coils connected in series of 5 or compose in parallel B phase winding, x/6 remainder be 3 coil and x/6 remainder be the coils connected in series of 6 or compose in parallel C phase winding, each phase winding is connected on asymmetrical half-bridge and runs with switched reluctance machines mode of operation;

When described bimodulus motor generator is in double salient-pole electric machine mode of operation, be the coil of 2 by x/6 remainder, x/6 remainder be 4 coil and x/6 remainder be the coils connected in series of 6 or compose in parallel excitation winding, the coil being 1 by x/6 remainder forms A phase winding, the coil being 3 by x/6 remainder forms C phase winding, the coil being 5 by x/6 remainder forms B phase winding, A phase winding, one end of C phase winding and B phase winding connects the neutral point of three brachium pontis of three-phase commutation bridge respectively, A phase winding, the other end of C phase winding and B phase winding is connected together as neutral point, run with double salient-pole electric machine mode of operation,

Described bimodulus motor generator, when being operated in switched reluctance machines pattern, not only can as motor running but also can as generator operation; When being operated in electric excitation biconvex electrode electric machine pattern, also not only can as motor running but also can as generator operation.

2. bimodulus motor generator as claimed in claim 1, is characterized in that: each coil is made up of several subcoil serial or parallel connections respectively, and when coil is used as excitation winding, each subcoil is connected, to obtain the higher excitation winding number of turn; When coil is used as armature winding, each subcoil is in parallel, to reduce the internal resistance of armature winding.

3. bimodulus motor generator as claimed in claim 1, is characterized in that: described bimodulus motor generator, as automobile starter-generator, is operated in switched reluctance machines pattern during starting; Be operated in electric excitation biconvex electrode electric machine mode of operation during generating, being energized to excitation winding and passing through to control the size of exciting current can control air-gap field, to keep the stable of output voltage.

4. bimodulus motor generator as claimed in claim 1, it is characterized in that: described bimodulus motor generator is as vapour automobile drive motor, drive during automobile and be operated in switched reluctance machines pattern, when reclaiming braking energy, be operated in electric excitation biconvex electrode electric machine mode of operation.