CN103683584B - A kind of opposite pole formula inductor machine of implicit salient pole - Google Patents

Abstract

The invention proposes a heteropolar induction motor with implicit salient poles. The stator core of the motor adopts a lamination structure, which is formed by lamination of silicon steel sheets, and a plurality of large grooves and a plurality of small grooves are arranged on the silicon steel sheets. The stator side includes a DC field winding and a three-phase armature winding. The field winding is embedded in the large slot of the stator core, and the armature winding is embedded in the small slot of the stator core. The motor rotor is also made of laminated silicon steel sheets, and the silicon steel sheets have a "mountain"-shaped magnetic isolation groove. The surface of the rotor is smooth, and the internal "mountain"-shaped magnetic isolation groove limits the main flux path in the motor, thus forming a "salient pole" effect on the rotor, and establishing a two-way alternating air gap in the air gap magnetic field. The induction submotor proposed by the present invention adopts a hidden salient pole structure, which reduces the cogging torque of the motor, reduces the torque ripple during the operation of the motor, improves the air path structure of the motor, and reduces the Wind friction loss improves the operating efficiency of the motor.

Description

A Different Pole Inductor Motor with Implied Salient Pole

technical field

The invention belongs to the technical field of motors, and in particular relates to an opposite-polarity induction motor with hidden salient poles.

Background technique

The rotor of the induction motor has a solid structure, which is simple and reliable, and there are no excitation windings or permanent magnets on the rotor. It has high strength and can withstand large centrifugal forces. Therefore, the induction motor is more used as a high-speed motor. In many fields Has a wide range of applications.

In order to establish an alternating air-gap magnetic field, the rotor of the induction motor needs to adopt a salient pole structure, that is, grooves are evenly arranged on the surface of the rotor. The adoption of the salient pole structure makes the induction sub-motor have problems such as large cogging torque, severe torque ripple, and increased wind friction loss. The problem.

Contents of the invention

Purpose of the invention: Aiming at the above-mentioned prior art, a heteropolar pole induction motor with implicit salient poles is proposed, so that the motor has the characteristics of small torque ripple, excellent starting and running performance, and low wind friction loss.

Technical solution: a heteropolar pole induction motor with implicit salient poles, including a stator and a rotor arranged inside the stator;

The surface of the rotor is smooth, including a rotor core made of laminated silicon steel sheets. Inside the silicon steel sheets are several "mountain"-shaped magnetic isolation grooves that are symmetrical to the axis of the rotating shaft; the "mountain" character The opening of the magnetic isolation groove faces the stator side; the "mountain" magnetic isolation groove on the silicon steel sheet is correspondingly arranged to form a magnetic barrier;

The stator includes a stator core made of laminated silicon steel sheets, an armature winding and an excitation winding; several large slots are evenly arranged on the stator core along the circumference of the stator, and the excitation winding is embedded in the large slots. Several small slots are evenly arranged between the two large slots, and single-phase or three-phase armature windings are embedded in the small slots.

As a preferred solution of the present invention, the "mountain"-shaped magnetic isolation groove is filled with air, or non-magnetically conductive material is used. The mechanical opening angle formed by the two sides of each "mountain"-shaped magnetic isolation groove is an adjustable mechanical opening angle. The silicon steel sheet of the rotor core is provided with an axial positioning hole for fixing the rotor silicon steel sheet.

Beneficial effects: In the heteropolar pole induction motor with implied salient poles of the present invention, the input of the excitation winding and the armature winding are both connected to the stator side of the motor, and the excitation power supply is a DC power supply, which together with the armature winding constitutes the " Other incentives" relationship. The surface of the rotor is smooth, and the internal "mountain"-shaped magnetic isolation slots are filled with air or non-magnetic materials. The magnetic isolation slots limit the main flux path in the motor, and each "mountain"-shaped magnetic isolation slot constitutes a magnetic barrier. , the magnetic barrier plays the role of a conventional induction motor rotor slot. The area between two adjacent "mountain"-shaped magnetic isolation slots can be regarded as the rotor salient pole of the traditional induction motor, which provides a path for the main magnetic flux, thus forming a "salient pole" effect on the rotor. A two-way alternating air gap magnetic field is established in the air gap. After direct current is passed into the field winding, an air-gap magnetic field with alternating polarity is formed in the air gap. With the rotation of the motor rotor, an induced electromotive force is generated in the armature winding. The input of the field winding and the output of the armature winding are both in the stator of the motor. side. Compared with the prior art, it has the following advantages:

1. The motor rotor adopts a hidden salient pole structure, the rotor surface is smooth, the wind friction loss is low, and the operation efficiency is high.

2. The motor rotor adopts a hidden salient pole structure, the cogging torque is small, the torque ripple is low, and the starting and running performance of the motor are improved.

3. The implied salient pole width on the motor rotor is fixed, and the magnetic flux path is clear, which is beneficial to the electromagnetic design and performance calculation of the motor;

4. Due to the advantages of small cogging torque and low torque ripple, the application field of the induction motor has been further expanded.

Description of drawings

Figure 1 is a schematic diagram of a radial cross-section of an opposite-polarity induction sub-motor with implied salient poles;

Figure 2 is a schematic diagram of the stator punching of the opposite-polarity induction motor with implicit salient poles;

Figure 3 is a schematic diagram of the rotor punching of the heteropolar induction sub-motor with implicit salient poles;

In the figure: stator core 1, rotor core 2, stator large slot 3, stator small slot 4, "mountain"-shaped magnetic isolation slot 5, positioning hole 6, armature winding 7, field winding 8.

detailed description

The present invention will be further explained below in conjunction with the accompanying drawings.

As shown in Figure 1, a heteropolar pole induction motor with implicit salient poles includes a stator and a rotor arranged inside the stator. The stator and rotor are coaxially installed, and the rotor has a smooth surface and an implicit salient pole structure inside.

As shown in Figure 2, the motor rotor 3 is cylindrical, including the rotor core 2 and the rotating shaft, and there is neither permanent magnet nor excitation winding on the rotor. The rotor core 2 is made of laminated silicon steel sheets, and each silicon steel sheet is provided with several "mountain"-shaped magnetic isolation grooves 5 that are symmetrical to the axis of the rotating shaft. In this embodiment, the "mountain"-shaped magnetic isolation grooves 5 is 6, so each "mountain"-shaped magnetic isolation slot occupies a mechanical angle of 60°. The opening of each "mountain"-shaped magnetic isolation slot faces the stator side, and there is a gap between two adjacent "mountain"-shaped magnetic isolation slots 5 . The "mountain"-shaped magnetic isolation grooves on all the laminated silicon steel sheets are set correspondingly, forming 6 magnetic barriers. Each silicon steel sheet of the rotor core 2 is provided with six axial positioning holes 6 for positioning and fixing the rotor silicon steel sheet. The rotor core formed by stacking rotor silicon steel sheets is a hollow cylinder inside, and multiple rotor punches are fixed together by axial fastening bolts. The cavity formed by the "mountain"-shaped magnetic isolation groove inside the rotor core is filled with air or non-magnetic material.

As shown in FIG. 3 , the stator is composed of a stator core 1 , an armature winding 7 and an excitation winding 8 . Wherein, the stator core 1 is formed by laminating silicon steel sheets with slots. There are two types of slots, the large slot 3 and the small slot 4, on the stator core silicon steel sheet. Several large slots 3 are evenly arranged on the stator core 1 along the circumference of the stator. In this embodiment, there are four large slots, and the field windings are embedded in the large slots 3 . Several small slots 4 are evenly arranged between two adjacent large slots, and single-phase or three-phase armature windings are embedded in the small slots 4 . In this embodiment, 6 small slots are evenly distributed between two adjacent large slots, and the armature winding 7 can be connected in series or in parallel to form a single-phase or three-phase winding. The input of the field winding 8 and the armature winding 7 are both connected to the stator side of the motor, and the field power supply is a DC power supply, which constitutes a "separate excitation" relationship in the DC motor with the armature winding.

If the number of "mountain"-shaped magnetic isolation slots on the motor rotor core punch is n, the number of small slots on the stator core punch should be 6n theoretically, but the influence of the existence of the field winding on the number of small slots needs to be considered , the actual number of small slots is less than 6n.

When there are 4 large slots on the motor stator and the armature winding is three-phase, in order to ensure that the armature winding has a 60° phase belt, the number of slots Z ₁ of the armature winding should be equal to 6 times the number of magnetic isolation slots Z ₂ of the rotor, The 4 small slots on the motor stator are divided into 6Z ₂ equal parts. Since the field winding is embedded in the stator core in addition to the armature winding, the actual number of slots of the armature winding Z ₁ '=2/3*6Z ₂ , that is, 2/3 of the stator core is used to embed the armature winding, Use 1/3 of the stator core to embed the field winding.

In addition, the mechanical opening angle formed by the two sides of each "mountain"-shaped magnetic isolation slot is an adjustable mechanical opening angle. The angle between the sides of each "mountain"-shaped magnetic isolation slot and the center symmetry line of the magnetic isolation slot is (180/n) ± 10°, where n is the number of "mountain"-shaped magnetic isolation slots.

The surface of the rotor of the motor is smooth, and the internal "mountain"-shaped magnetic isolation groove limits the main flux path in the motor, thus forming a "salient pole" effect on the rotor. After direct current is passed into the field winding, an air-gap magnetic field with alternating polarity is formed in the air gap. With the rotation of the motor rotor, an induced electromotive force is generated in the armature winding. The input of the field winding and the output of the armature winding are both in the stator of the motor. side. The magnetic barrier formed by the "mountain"-shaped magnetic isolation slot in the rotor core plays the role of the rotor slot of the traditional induction motor. The area between two adjacent "mountain"-shaped magnetic isolation slots can be regarded as the salient pole of the rotor of the traditional induction motor, providing a path for the main magnetic flux.

The heteropolar pole induction motor with implied salient poles proposed by the present invention abandons the rotor salient pole structure of the traditional induction motor, eliminates the obvious cogging salient pole effect, reduces the cogging torque of the motor, and improves the starting of the motor and operating performance, while reducing the wind friction loss during operation and improving the operating efficiency of the motor.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (4)

1. an opposite pole formula inductor machine for implicit salient pole, is characterized in that: comprise stator and be arranged on the rotor inside described stator;

Described rotor surface is smooth, comprises by the rotor core of silicon steel plate stacking (2), and described silicon steel sheet inside is provided with several " mountain " font magnet isolation tanks (5) symmetrical centered by rotating shaft core; The opening of described " mountain " font magnet isolation tank is towards stator side; " mountain " font magnet isolation tank on described silicon steel sheet arranges and forms magnetic barrier;

Described stator comprises by the stator core of silicon steel plate stacking (1), armature winding (7) and excitation winding (8); Described stator core (1) evenly arranges several vats (3) along stator circumference, described vat embeds excitation winding in (3), between two adjacent vats, several sulculuses (4) are evenly set, in described sulculus (4), embed single-phase or threephase armature winding.

2. the opposite pole formula inductor machine of a kind of implicit salient pole according to claim 1, is characterized in that: fill air in described " mountain " font magnet isolation tank (5), or fills non-magnet material.

3. the opposite pole formula inductor machine of a kind of implicit salient pole according to claim 1, is characterized in that: the mechanical subtended angle that the dual-side of described each " mountain " font magnet isolation tank is formed is adjustable mechanical subtended angle.

4. the opposite pole formula inductor machine of a kind of implicit salient pole according to claim 1, is characterized in that: the silicon steel sheet of described rotor core (2) is provided with the axial location hole (6) in order to fixed rotor silicon steel sheet.