CN201478982U - Hybrid Excitation Double Salient Structure Linear Motor - Google Patents

Abstract

A hybrid excitation double-salient pole structure linear motor relates to the fields of electrician, motor and rail transit, in particular a novel hybrid excitation linear motor suitable for urban rail transit, the motor includes primary (1), Secondary (2); primary (1) includes permanent magnet (3), armature winding (4), field winding (5), primary iron core (6), secondary (2) includes secondary iron core (7) ; The permanent magnet (3) is arranged in the primary iron core (6) on the primary (1), the armature winding (4) is a concentrated winding, and is wound on the teeth of the primary iron core (6), and the field winding (5) is wound on the teeth of the primary iron core (6); the primary (1) is arranged on the train; the secondary (2) is a magnetically permeable steel rail, and is arranged on the train track. The utility model has the ability to adjust the magnetic field, can reduce the cost of rail transit, and improve the efficiency of the motor, and has high theoretical and practical value.

Description

Hybrid Excitation Double Salient Structure Linear Motor

technical field

The utility model relates to the fields of electrician, motor and rail transit, in particular to a novel hybrid excitation linear motor suitable for urban rail transit.

Background technique

With the acceleration of urbanization and the density of urban buildings, urban rapid rail transportation tools such as subways and light rails play an important role in the sustainable development of cities with their advantages of low energy consumption, less pollution, and punctuality. As the requirements for the safety, speed and comfort of rail vehicles are getting higher and higher, the performance of traction motors driving rail transit trains is also required to be higher, and the research in this field has also been related. Scholars are increasingly paying attention.

In terms of technology, electrified urban rail traction motors can mainly adopt two technical approaches: rotary motors and linear motors. Urban rail trams using linear motors directly convert electrical energy into mechanical energy for linear motion without any transmission device for intermediate conversion mechanisms, which can avoid various problems caused by sliding and idling; in addition, compared with rotary motors, linear motors, The height of the vehicle body is reduced, which can reduce the amount of subway construction, thereby reducing the construction cost. Therefore, research on linear motors used in urban rail transit has great theoretical significance and far-reaching economic and social value.

At present, the research on linear motors for urban rail transit in the field of electrotechnical technology mainly includes linear asynchronous (induction) motors and linear synchronous motors, and the latter can be divided into electric excitation linear synchronous motors and permanent magnet linear synchronous motors. Among them, the linear induction motor has been studied earlier and has a wider range of applications, but it has deficiencies in power factor, power density, and efficiency. In addition, combined with my country's monopoly position in rare earth permanent magnet materials, research on permanent magnet linear motors for rail transit with high power density has more obvious advantages. Compared with the induction linear motor, the permanent magnet structure has high efficiency, high power density, high force index, small size and light weight. There are two types of commonly used structures at present, (1) the permanent magnet is installed on the primary (mover), that is, the carriage, and the armature winding that interacts with it to generate driving force is laid on the secondary, that is, the track; 2) The armature windings are placed on the primary carriage, while the permanent magnets are laid on the track. It can be seen that no matter it is any of the above-mentioned structures, winding wires or permanent magnets need to be laid on the side of the rail, which greatly increases the project cost and also brings difficulties to the maintenance and management along the track.

Therefore, applying the rotary stator permanent magnet motor based on the doubly salient pole structure, which was proposed and developed and applied in the mid-1990s, to the linear primary permanent magnet motor can overcome the above shortcomings and present a good Research and practical prospects. For example, its permanent magnets and armature windings are placed on the primary (moving carriage), while the secondary (track) only needs to be laid by soft magnetic materials with magnetic permeability. This is transformative, both in terms of cost and track maintenance. Then, there is an important problem in the three main primary permanent magnet linear motor structures that appear at present, that is, the unipolar flux pulsation type, the bipolar flux switching type, and the bipolar flux reversal type, that is, the magnetic field It is produced by a single magnetic source of a permanent magnet, and cannot be adjusted in time and quickly according to the requirements of train operation performance. for this shortcoming.

Contents of the invention

Technical problem: The purpose of this utility model is to overcome the disadvantage that its magnetic field cannot be adjusted on the basis of maintaining the excellent characteristics of the pure primary permanent magnet double salient pole linear motor, and propose a hybrid excitation double salient pole linear motor. It is especially suitable for applications in urban rail transit and other fields.

Technical solution: The utility model is based on the primary permanent magnet double salient pole linear motor, by rationally arranging the primary space, adding a set of electric excitation windings for adjusting the magnetic field, and combining the excitation windings, armature windings and permanent magnets They are all placed on the primary side of the linear motor (that is, on the moving carriage), and the secondary side of the linear motor is laid on the rail of the train using common magnetically conductive materials. Therefore, while improving the performance adjustability and flexibility of the pure permanent magnet linear motor, the present invention does not increase the volume of the motor and change the simplicity and firmness of the secondary structure.

The motor includes a primary and a secondary with a salient pole structure; the primary includes a permanent magnet, an armature winding, an excitation winding, and a primary iron core, and the secondary includes a secondary iron core; the permanent magnet is arranged in the primary iron core on the primary, The armature winding is a concentrated winding, which is wound on the teeth of the primary iron core, and the excitation winding is wound on the teeth of the primary iron core; the primary is placed on the train; the secondary is a magnetic steel rail, which is placed on the train track.

The field winding is located on the teeth of the primary iron core in the primary and regulates the air-gap magnetic field generated by the permanent magnets. The permanent magnets are arranged on the primary and distributed on the yoke, between the teeth or on the surface of the teeth of the primary iron core.

Beneficial effects: The magnetic field controllable primary permanent magnet linear motor based on the doubly salient pole structure has the advantages of simple structure, high power density, adjustable magnetic field, high efficiency, large output, and low cost, and can be used in urban rail transit and other fields.

1. The secondary adopts a simple salient pole structure, no winding, no brush, no permanent magnet, suitable for rail transit and other occasions, no need to lay permanent magnets or wire windings on the track, which can reduce the manufacturing cost of the motor and is easy to construct;

2. The armature winding on the primary is a centralized winding, which is convenient for making embedded wires, with small resistance and low copper loss;

3. The excitation winding on the primary can be magnetized or demagnetized according to the needs of train operation performance. In case of emergency, it can be completely demagnetized, so as to ensure the safety of the train and improve the reliability;

4. The permanent magnet is placed in the primary, which is beneficial to heat dissipation and suppress temperature rise while inheriting the advantages of high power density of the permanent magnet motor;

5. The permanent magnet can be magnetized or demagnetized online by using the armature winding or field winding on the same primary;

6. The urban rail train adopting this kind of linear motor structure reduces the construction cost;

7. The permanent magnet can be placed in the primary yoke, between the teeth and the tooth surface. According to the actual needs, the permanent magnet flux linkage of the motor can be flexibly designed as unipolar or bipolar, and the potential waveform of the motor can be controlled as sine wave or trapezoidal wave.

Description of drawings

Fig. 1 is a structural schematic diagram of a hybrid excitation double salient structure linear motor with permanent magnets placed on the primary yoke;

Fig. 2 is a structural schematic diagram of a hybrid excitation double salient structure linear motor with permanent magnets placed between the primary teeth;

Fig. 3 is a structural schematic diagram of a hybrid excitation double salient structure linear motor with permanent magnets placed on the primary tooth surface;

In the above figure, there are: primary 1, secondary 2, permanent magnet 3, armature winding 4, field winding 5, primary iron core 6 and secondary iron core 7.

Detailed ways

The hybrid excitation type double salient structure linear motor proposed by the utility model has a salient pole structure in both its primary and secondary stages. Figure 1-3 shows three kinds of magnetic field controllable primary permanent magnet linear motors with double salient pole structure , the permanent magnets are respectively placed in the yoke of the primary core, between the teeth and the tooth surface, and are named as the magnetic field controllable flux pulsating primary permanent magnet linear motor and the magnetic field controllable flux switching primary according to their magnetic field characteristics. Permanent magnet linear motors and field-controllable flux-inverting primary permanent magnet linear motors. The common feature of this type of motor is that the primary is composed of iron core, armature winding, field winding and permanent magnet, which are installed on the rail train; the secondary has neither winding nor permanent magnet, and is made of magnetically conductive material in a salient pole shape , placed on the side of the rail.

Taking a magnetic field controllable flux switching primary permanent magnet linear motor with permanent magnets placed between the primary teeth as an example, its cross-sectional view is shown in Figure 2. The linear permanent magnet motor of the present invention is composed of a primary 1 , a secondary 2 , a permanent magnet 3 fixed on the primary 1 , an armature winding 4 , an excitation winding 5 , a primary iron core 6 and a secondary iron core 7 . Wherein, the primary 1 is provided with salient poles, and the permanent magnets 3 are symmetrically distributed between the teeth of the salient poles of the primary 1 . The primary 1 is composed of a "U"-shaped primary iron core 5 and a permanent magnet 3 . The armature winding 4 on the primary 1 is a concentrated winding, each coil winding straddles two teeth, and a permanent magnet 3 is embedded in the middle. The excitation winding 5 on the primary 1 is a concentrated winding, and each coil winding straddles the slot vacated by the permanent magnet 3 . Secondary 2 has a number of teeth forming secondary salient poles, the number of which is determined by the length of the track. The primary iron core 5 is formed by laminating iron core punching sheets of soft magnetically permeable material. The secondary iron core 7 adopts magnetically permeable material as a steel rail, and is placed on the side of the train track.

The other two types of hybrid excitation double-salient structure linear motors can adopt similar implementations.

Claims (3)

1. composite excitation type biconvex electrode structure linear electric motors is characterized in that this motor comprises elementary (1), secondary (2) of all adopting salient-pole structure; Elementary (1) comprises permanent magnet (3), armature winding (4), excitation winding (5), elementary iron core (6), and secondary (2) comprise secondary iron core (7); Permanent magnet (3) is arranged in the elementary iron core (6) on elementary (1), and armature winding (4) is around on the tooth of elementary iron core (6) for concentrating winding, and excitation winding (5) is around on the tooth of elementary iron core (6); Elementary (1) is placed on the train; Secondary (2) are the magnetic conductivity rail, are placed on the train rail.

2. according to the described composite excitation type biconvex of claim 1 electrode structure linear electric motors, it is characterized in that excitation winding (5) is arranged on the tooth of elementary iron core (6) of elementary (1), regulates the air-gap field that permanent magnet (3) produces.

3. according to the described composite excitation type biconvex of claim 1 electrode structure linear electric motors, it is characterized in that permanent magnet (3) is arranged on elementary iron core (6) was gone up and be distributed in elementary (1) yoke portion, between cog or tooth surface.

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