WO2004091071A1 - Permanent magnetic bias magnetic type reluctance motor - Google Patents

Abstract

This invention belongs to electric machine field, particularly relates to the advances of reluctance motor or reaction motor, that is a permanent magnetic bias magnetic type reluctance motor. It includes housing, stator, rotor and permanent magnet, and the stator core is at least composed of a pair of soft magnetic material which has wire groove, magnetic yoke and furcate finger, the furcate fingers of conjugated stator cores are arranged interlaced with a permanet magnet between them. A wire groove is arranged on adjacent furcate fingers of the stator core, and there are also has wire grooves on the furcate fingers. This invention is bias magnetic by using permanent magnet, because it has advantage which are saving copper wire more than half of them and locating wire space, predigest external wires, reducing motor size, reducing copper loss and iron loss, increasing efficiency. In addition, the connection of drive circuit can be agiler.

Description

 Permanent magnet bias magnet reluctance motor

Technical field

 The invention belongs to the field of electromechanical, and particularly relates to an improvement of a reluctance motor or a reactive motor, and a permanent magnet bias reluctance motor. . Background technique

 Reluctance motors (also known as reactive motors) are generally considered to be large in pulse vibration, low in efficiency, and complex in driving. Therefore, they are not as widely used as DC motors, asynchronous motors, and synchronous motors. They are commonly used as stepper motors and switched reluctance motors. . The reluctance motor is driven by a DC ripple current. Taking a three-phase reluctance motor as an example, in the case of the current chopper drive circuit, at low speed, the motor current is equivalent to a rectangular wave. Analyze rectangular waves, including: DC + fundamental + third harmonic + fifth harmonic + ... and other components. The DC component ensures that the total flux is always a one-way flux, which is necessary for the normal operation of the reluctance motor, and the fundamental component is equivalent to the part of the AC motor that generates the rotating magnetic field, and the function is three, five times, etc. The subharmonic component is a harmful component that causes motor vibration and heat generation. Summary of the invention

 The purpose of the invention is to replace the unidirectional magnetic flux generated by the DC component in the driving winding by using the unidirectional magnetic flux of the permanent magnet, and design a permanent magnet bias magnetic reluctance motor to retain the DC component and the fundamental component, and eliminate the harmonic Wave components to overcome the shortcomings of reluctance motors. The "bias magnetic" is named after the bias magnetic head of the recorder, which is similar to the "bias current" principle in the transistor circuit. In order to achieve the above object, the technical solution of the present invention is realized as follows: A permanent magnet bias magnetic reluctance motor comprising a casing, a stator, a rotor and a permanent magnet, the stator core having at least a pair of belts The wire slot, the yoke and the fork are made of independent soft magnetic material, and the fingers of the pair of stator cores are alternately arranged with a permanent magnet therebetween.

 The permanent magnet bias magnet reluctance motor is provided with a line groove at an adjacent interdigitated stagger of the stator core.

 The permanent magnet bias magnetic reluctance motor has a wire groove on the fingers of the stator core.

The utility model adopts an interdigitated iron core structure, and the alternating magnetic flux and the direct current magnetic flux each have a magnetic circuit, and the special magnetic circuit structure is adopted to eliminate the mutual influence between the two and interfere with each other. With permanent magnet bias, it can save more than half of copper wire, reduce downline space, simplify external wiring, reduce motor size, reduce copper loss and iron loss, and improve The efficiency of the motor. In addition, the external wiring is further simplified, and the connection of the drive circuit is more flexible. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be further described below in conjunction with specific legends:

 Figure 1 (a) Schematic diagram of the stator structure in the six slots, (b) A-A section view, (c) reference diagram of the drive winding connection; Figure 2 Schematic diagram of the twelve-slot outer stator structure;

 Figure 3 Schematic diagram of the multi-slot magnetic pole stator structure. Detailed ways

 The invention relates to a permanent magnet bias magnet reluctance motor, which is composed of a casing, a stator, a rotor and a permanent magnet, and the stator core is made of at least one pair of independent soft magnetic materials with a wire groove, a yoke and an interdigital finger. The fingers of the pair of stator cores are alternately arranged with permanent magnets therebetween. The unidirectional constant magnetic flux generated by the permanent magnets is superimposed on the alternating magnetic flux generated by the driving windings in the wire grooves to drive the rotor to rotate. The invention has reasonable structural design, and the magnetic flux generated by the permanent magnet replaces the unidirectional bias magnetic flux generated by the DC portion of the driving winding, which can save half of the copper wire during manufacture, reduce the space of the lower wire, reduce the size of the motor, and save the core consumption. The amount, which in turn reduces the copper loss and iron loss of the operation, and improves the cost performance of the motor. In addition, the external wiring is further simplified, and the connection of the drive circuit is more flexible. - Permanent magnet bias reluctance motor, similar to the drive performance of synchronous motor, can use the same drive circuit, the same drive mode, has a wider range of uses, and the performance price ratio is significantly higher than that of the same motor. 'Example 1:

 Referring to Fig. 1, a permanent magnet bias magnet reluctance motor composed of a casing, a stator, a rotor and a permanent magnet, wherein the stator core 1 is at least a pair of a wire groove 2, a yoke 3, a pole tooth 4 and a fork The fingers are made of an independent soft magnetic material, and the fingers 5 of the pair of stator cores are alternately arranged with permanent magnets 6 therebetween.

 Figure l(a)(b) shows the structure. According to the typical structure of the six-pole multi-tooth internal stator in the figure, the magnetic poles of the adjacent magnetic poles have different polarities. A line groove 2 is provided at the intersection of the adjacent fingers 5 of the stator core 1.

Figure 1(a) shows a relatively large magnetic pole with a uniform small tooth, that is, a pole tooth 4. If the number of teeth is 1, it becomes a typical yoke reluctance motor structure. It is equipped with the three-phase two-pole and double-layer short-pole-stack windings shown in Figure 1(c). The star-connected method with the midpoint floating at the outer wiring can fully utilize the characteristics of less harmonic components, further reducing the inductance and saving. Copper wire, improving magnetic field distribution. The structure shown in Fig. 1(a)(b) is manufactured by only two kinds of punches, which are assembled into a part with a finger 5 by a fastening process, and a permanent magnet 6 made of a permanent magnet material is placed between the two parts. After the assembly is dipped, the mating surface is properly machined, and then magnetized to complete the assembly of the stator core 1. Embodiment 2 - Referring to Fig. 2, the structure shown is based on the structure of Fig. 1(a), and is turned inside out. The illustration shows a 12-slot outer stator structure. It can be arranged to be wound into a two-phase six-pole, three-phase four-pole motor or a six-phase two-pole motor; or it can adopt various forms such as concentrated winding, whole pole pitch and short pole pitch; The stator teeth have different combinations of teeth and so on, so they are widely used. Moreover, the number of poles can be changed as needed. Similarly, the teeth on each pole can also be single teeth.

 The stator core 1 shown in Fig. 1 and Fig. 2 cannot be too large in axial dimension due to structural problems. If necessary, several identical stator cores 1 can be used, and several stators of the same polarity face each other in the axial direction, stacked back to back, forming a combined single stator core structure, loaded into the same casing, with a contract Long rotors, recalculating the winding parameters, can produce larger sizes of motors. This type of motor is suitable for applications where the output torque is large. Figure 1 and Figure 2 show the number of slots, the number of teeth, and the size of the core. The structure of Figure 1 is the inner stator. The structure of Figure 2 is the outer stator, which forms a double air gap structure. The cup rotor is matched in the middle, which can greatly increase the unit. Volume output torque. Example 3: '

 In some special occasions, such as: Micro-motors often use multi-pole structure and concentrated winding, and the motor size is too small, making the interdigitated part difficult to make; the larger motor requires further improvement of the drive characteristics, or as a generator, to obtain Better output waveforms require fractional pole-distance distributed windings.

 3 is a schematic view of a multi-groove pole stator structure, which is considered for the above-mentioned use, in which the stator core 1 is provided with a line groove 2 except for the X-finger 5 interlaced at the adjacent stator core 1. A wire groove 21 is provided on the interdigital finger 5 of the stator core. The figure shows a four-pole 16-slot internal fixed structure, which can be changed to other magnetic poles and slot numbers as needed. It can also be turned into Figure 2 (a) and Figure 3 (for the outer stator structure).

Claims

 A permanent magnetic bias magnet reluctance motor comprising a housing, a stator, a rotor and a permanent magnet, wherein the stator core is composed of at least one pair of independent soft magnetic materials with a wire groove, a yoke and an interdigital finger. The fingers of the pair of stator cores are alternately arranged with permanent magnets therebetween. .  2. The permanent weight magnetic bias reluctance motor according to claim 1, wherein a wire groove is provided at an adjacent interdigitated stagger of the stator core.  The permanent magnet bias reluctance motor according to claim 1 or 2, wherein a wire groove is provided on the interdigital finger of the stator core. Book