CN201298801Y - Modular fault-tolerant permanent magnetic switch magnetic-linkage linear motor - Google Patents

Abstract

The utility model discloses a modular fault-tolerant permanent magnet switch flux-linkage linear motor, which includes a stator and a mover, the stator is a flat plate or a cylinder composed of a cogged iron core, and the mover is composed of several modules and magnetic resistance sheets arranged at intervals Flat plate or cylinder, each module consists of two inverted "U"-shaped cores, permanent magnets sandwiched between the two "U"-shaped cores, and three-phase armature windings, two "U"s sandwiching the permanent magnets Armature teeth are formed on the side of the iron core, and auxiliary teeth are formed on the sides of the two "U" iron cores sandwiching the magnetic resistance sheet. The three-phase armature winding is wound on the armature teeth, and no winding is wound on the auxiliary teeth. poles and S poles are arranged alternately. In the linear motor of the utility model, the required coils and permanent magnets are all placed in the mover part, and the stator part is only composed of iron core laminations, which is low in cost and is especially suitable for long-distance linear motion drive systems; in addition, the modular design is convenient for assembly and easy Mass production.

Description

A modular fault-tolerant permanent magnet switch flux linkage linear motor

technical field

The utility model relates to a permanent magnet brushless DC motor, in particular to a modular fault-tolerant permanent magnet switch flux chain linear motor, which belongs to the technical field of motor manufacturing.

Background technique

The motor is the main driving component in the transmission system, and choosing a suitable motor can improve the performance of the entire transmission system. In many linear motion situations, traditional rotary motors need to use certain mechanical transmission components, such as screw rods, to convert the rotary motion output by the rotary motor into a linear motion, and then finally use it to drive the linear motion. The problems brought about by this include increased volume and weight of the system, high noise, low control accuracy caused by large mechanical inertia, high maintenance costs, and short service life. A more reasonable solution is to use a suitable linear motor to replace the rotary motor, eliminating the need for mechanical transmission components and using a linear motor to directly drive. Although the efficiency of the rotary motor itself is higher than that of the linear motor, considering the efficiency of the entire transmission system, the linear motor direct drive system is higher.

With the development of power electronics technology, permanent magnet materials and microcomputer control technology, the permanent magnet brushless DC motor has been developed rapidly. The permanent magnet brushless DC motor has the characteristics of high efficiency, high power density and high reliability. The advent of magnetic materials has greatly improved the power density and performance of permanent magnet brushless DC motors. The corresponding form of permanent magnet brushless DC linear motor has also been proposed accordingly, but because the permanent magnet and the winding are placed on the stator and the mover respectively, when the stroke is long, no matter whether the permanent magnet is placed on the stator or the winding is placed On the stator, the number of permanent magnets or windings required is huge, and the cost is very high.

Recently, a new type of permanent magnet switched flux linkage motor has been more and more extensively studied. In this rotating electrical machine, both permanent magnets and windings are placed on the stator side, while the rotor consists of only core laminations. The permanent magnet switch flux linkage motor also exhibits the characteristics of high efficiency, high power density, high reliability, etc., and is easy to dissipate heat and has good overload capacity. The corresponding linear motor form has also been proposed. In the permanent magnet switch flux linkage linear motor, the permanent magnet and winding are placed on the mover side, and the stator is only composed of an iron core. Therefore, in the case of long strokes, few permanent magnets and windings are required, and the cost is very low. However, in the traditional permanent magnet switch flux linkage linear motor, the magnetic flux leakage at the end is serious, the utilization rate of the permanent magnet is low, and the slot fullness rate of two sets of windings placed in one slot is low.

Contents of the invention

The purpose of the utility model is to propose a modular fault-tolerant permanent magnet switch flux-linkage linear motor, which improves the utilization rate of permanent magnets and has considerable fault tolerance, and is suitable for application in traffic traction, industrial transmission and other fields.

The utility model discloses a modular fault-tolerant permanent magnet switch flux-linkage linear motor, which includes a stator and a mover, the stator is a flat plate or a cylinder composed of a cogged iron core, and the mover is composed of several modules and magnetic resistance sheets arranged at intervals Flat plate or cylinder, each module consists of two inverted "U"-shaped cores, permanent magnets sandwiched between the two "U"-shaped cores, and three-phase armature windings, two "U"s sandwiching the permanent magnets Armature teeth are formed on the side of the iron core, and auxiliary teeth are formed on the sides of the two "U" iron cores sandwiching the magnetic resistance sheet. The three-phase armature winding is wound on the armature teeth, and no winding is wound on the auxiliary teeth. poles and S poles are arranged alternately.

The above-mentioned stator core is made of laminated silicon steel sheets. The opening of the said "U" shaped iron core is full opening or half opening; it is formed by stacking silicon steel sheets.

In the utility model, said permanent magnet is parallel magnetized neodymium iron boron, samarium cobalt or ferrite. The three-phase armature windings are concentrated windings, fractional slot windings or distributed windings. Said magnetoresistive sheet is plastic, aluminum or ceramics.

Due to the salient pole effect formed by the stator teeth, with the change of the position of the mover, the excitation flux chain of the permanent magnet hinged by the armature winding changes in bipolarity, which induces a counter electromotive force. If an appropriate current is applied to the armature winding It can drive the mover to move in a straight line. By controlling the magnitude and frequency of the voltage applied to the armature winding, the speed of the motor can be adjusted to meet the needs of different occasions.

The beneficial effects of the utility model:

1. Modular fault-tolerant permanent magnet switch flux linkage linear motor has the advantages of permanent magnet switch flux linkage rotary motor and linear motor.

2. Both the permanent magnet and the three-phase armature winding are placed on the side of the mover with a short length, and the stator is only composed of iron core laminations, which is low in cost, especially for long strokes, which has a great cost advantage.

3. The modular design is convenient for assembly and low-cost mass production.

4. The three-phase armature windings are arranged at intervals, and the mutual inductance between the windings is very small, which realizes the electromagnetic isolation between the windings and has high fault tolerance performance.

5. The auxiliary teeth play a role in physical isolation of the three-phase armature winding, further improving the fault tolerance performance of the motor.

6. The control method of the traditional permanent magnet brushless DC motor can be adopted, and the control is flexible and diverse.

Description of drawings

Fig. 1 is a structural schematic diagram of a modular fault-tolerant permanent magnet switch flux-linkage linear motor of the present invention.

Detailed ways

Referring to Figure 1, the modular fault-tolerant permanent magnet switch flux-linkage linear motor includes a stator 1 and a mover 2. In the illustrated example, the stator is a flat plate composed of a cogged iron core, and the mover is a number of modules 3 and reluctance plates 4 The flat plates are arranged at intervals, and each module includes two inverted "U"-shaped iron cores 3.1, a permanent magnet 3.2 sandwiched between the two "U"-shaped iron cores, and a three-phase armature winding 3.3, and the permanent magnet 3.2 is sandwiched The two "U" iron core sides form the armature teeth, and the two "U" iron core sides sandwiching the magnetic resistance sheet 4 form the auxiliary teeth. The three-phase armature winding 3.3 is wound on the armature teeth, and no winding is wound on the auxiliary teeth. The N poles and S poles of the permanent magnets of adjacent modules are arranged alternately.

In the legend, the mover 2 is composed of 6 modules 3 and 5 reluctance plates 4, and the three-phase armature winding 3.3 is two pairs of pole concentrated windings; within the effective length of the mover, there are 6 permanent magnets in total, and the number of stator teeth is 14 .

When working, the three-phase armature winding is connected to the control circuit, and the control circuit is connected to the DC power supply. Use the position sensor to detect the position of the mover, so as to determine the conduction state of the three-phase armature winding, because the DC power supplies the three-phase winding with a frequency f of three-phase voltage through the control circuit, then the frequency flowing in the three-phase winding is the same as For the three-phase current of f, the mover speed v _s =2·τ _s ·f (τ _s is the stator tooth pitch). Changing the voltage and frequency can adjust the mover speed.

Claims (7)

1. A modular fault-tolerant permanent magnet switch flux-linkage linear motor is characterized in that it comprises a stator (1) and a mover (2), the stator is a flat plate or a cylinder made of a cogged core, and the mover is several Modules (3) and magnetoresistive sheets (4) are arranged at intervals to form flat plates or cylinders, each module includes two inverted "U"-shaped iron cores (3.1), and a permanent magnet sandwiched between the two "U"-shaped iron cores The magnet (3.2) and the three-phase armature winding (3.3), the two "U" core sides of the permanent magnet (3.2) are sandwiched to form the armature teeth, and the two "U" core sides of the magnetic resistance sheet (4) are sandwiched Auxiliary teeth are formed, three-phase armature windings (3.3) are wound on the armature teeth, no winding is wound on the auxiliary teeth, and N poles and S poles of permanent magnets of adjacent modules are arranged alternately. 2. The modularized fault-tolerant permanent magnet switch flux-linkage linear motor according to claim 1, characterized in that said stator (1) is formed by laminating silicon steel sheets. 3. The modular fault-tolerant permanent magnet switch flux-linkage linear motor according to claim 1, characterized in that the opening of the "U"-shaped iron core (3.1) is full opening or half opening. 4. The modular fault-tolerant permanent magnet switch flux linkage linear motor according to claim 1, characterized in that the "U"-shaped iron core (3.1) is made of silicon steel sheets. 5. The modular fault-tolerant permanent magnet switch flux linkage linear motor according to claim 1, characterized in that said permanent magnet (3.2) is NdFeB, SmCo or ferrite magnetized in parallel. 6. The modular fault-tolerant permanent magnet switch flux linkage linear motor according to claim 1, characterized in that said three-phase armature winding (3.3) is concentrated winding, fractional slot winding or distributed winding. 7. The modularized fault-tolerant permanent magnet switch flux linkage linear motor according to claim 1, characterized in that said reluctance sheet (4) is made of plastic, aluminum or ceramics.

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