CN111077450B

CN111077450B - Variable load device for motor test

Info

Publication number: CN111077450B
Application number: CN202010056592.4A
Authority: CN
Inventors: 张宇; 赵磊; 杨立; 何加林
Original assignee: Guizhou Kaiminbo Electromechanical Technology Co ltd
Current assignee: Guizhou Kaiminbo Electromechanical Technology Co ltd
Priority date: 2020-01-18
Filing date: 2020-01-18
Publication date: 2024-06-07
Anticipated expiration: 2040-01-18
Also published as: CN111077450A

Abstract

The invention discloses a variable load device for motor test, belonging to a motor test device. Comprising a stator and a rotor in a housing; the shell is formed by involution and fixation of a left shell (12) and a right shell (8), and circular boss (14) with reluctance grooves (9) uniformly distributed on the surfaces are arranged in the left shell (12) and the right shell (8); the stator is composed of a magnetic conduction ring (5) positioned in the shell, a plurality of magnetic steels (1) uniformly distributed on the peripheral surface of the magnetic conduction ring and electromagnetic windings positioned at two sides of the magnetic conduction ring (5), wherein the electromagnetic windings are composed of an iron core frame (2) fixed on a circular boss (14) and a plurality of coils (4) which are wound on each spoke and are sequentially connected in series; the rotor is composed of a rotating shaft (10) supported in the shell, a heat dissipation ring (11) fixed on the rotating shaft, and vortex rings (6) respectively fixed on two sides of the heat dissipation ring. The device is simple in structure and convenient to adjust load, and is used for testing the load of the high-precision motor.

Description

Variable load device for motor test

Technical Field

The present disclosure relates to motor testing devices, and particularly to a motor testing variable load device.

Background

As required, the motor is typically tested for its load capacity before shipping. It is common today to install a torque sensor between the motor output shaft and the work machine drive shaft to measure the load torque of the motor. The method is simple, but the load is a non-constant value due to the non-uniformity of cogging torque and magnetic resistance, so that the rotation speed of the motor to be tested fluctuates due to the fluctuation of the load, and the test precision is affected. Therefore, the existing motor load device cannot meet the motor test requirements of high rotation speed and high torque precision, and the research and development of a load device with constant resistance and adjustable is imperative.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a motor test variable load device which has a simple structure and can uniformly and steplessly change the load.

In order to achieve the above purpose, the present invention adopts the following technical scheme: it includes a stator and a rotor in a housing; the shell is formed by involution and fixation of a left shell and a right shell, the inner walls of the left shell and the right shell are respectively provided with a circular boss which is coaxially arranged, and the end surfaces of the circular bosses are provided with a plurality of reluctance grooves which are uniformly distributed along the radial direction; the stator is composed of a magnetic conduction ring positioned in the shell, a plurality of magnetic steels uniformly distributed and adsorbed on the outer circumferential surface of the magnetic conduction ring, and electromagnetic windings respectively positioned at two sides of the magnetic conduction ring, wherein each electromagnetic winding is composed of an iron core frame which is fixed on the outer circumferential surface of a corresponding circular boss and has a spoke-shaped structure, and a plurality of coils which are wound on each spoke and are sequentially connected in series; the rotor consists of a rotating shaft supported in the shell, a heat dissipation ring which is positioned in the magnetic conduction ring and fixed on the rotating shaft, and vortex rings which are respectively fixed on two sides of the heat dissipation ring.

The two magnetic pole surfaces of the magnetic steel are obliquely arranged relative to the rotating shaft; the corresponding magnetic pole directions of the two electromagnetic windings are the same; a plurality of radiating holes are formed in the radiating ring and the shell at positions corresponding to the radiating ring; the outer peripheral surface of the magnetic conduction ring is of a regular polygon structure.

Compared with the prior art, the invention has the following advantages due to the adoption of the technical scheme:

1) The magnetic steel is arranged on the magnetic conductive ring with larger diameter, so that the volume of the magnet can be effectively increased, the braking magnetic load is increased, and the braking power is improved.

2) The magnetic pole face of the magnetic steel is designed to be an inclined plane (namely, a certain included angle is formed between the magnetic pole face and the axis of the rotating shaft), the magnetic conduction ring and the magnetic steel are reliably fixed together by utilizing the self-alignment performance and the suction force of the magnetic steel and are embedded in the shell, so that the fixation can be realized without any mechanical accessory or adhesion, and the disassembly, the assembly and the maintenance are convenient.

3) The electromagnetic windings are added on the two sides of the magnetic conduction ring, so that an additional magnetic field can be formed, and the size of the rotor cutting magnetic flux can be adjusted by changing the direction or strength of the additional magnetic field, so that the rotor can be subjected to different magnetic resistance, and the sensitivity of the test is improved.

4) Circular boss with end surfaces uniformly distributed with reluctance grooves are arranged in the left shell and the right shell to form a plurality of pairs of pole shoes in a ring gear shape; therefore, the fixed magnetic field of the magnetic steel and the electromagnetic field formed by the electromagnetic winding can be converted into a non-uniform magnetic field, so that strong eddy currents can be formed in the eddy current ring, and the magnetic induction resistance can be increased.

5) The left shell, the right shell and the radiating ring are provided with radiating holes, so that heat generated by the electric vortex can be rapidly and outwards diffused, and a good cooling effect can be achieved.

6) The intervals between the pole shoes and the heat dissipation ring which are uniformly distributed in a circumferential shape are consistent, so that the magnetic resistance between the pole shoes and the heat dissipation ring is uniform, and the generated resistance moment is constant under the condition that the rotating speed of the rotor is unchanged.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is a schematic perspective view of the left or right housing of the present invention;

FIG. 5 is a schematic illustration of the electromagnetic winding structure of the present invention;

fig. 6 is a C-C cross-sectional view of fig. 5.

In the figure: the magnetic steel 1, the iron core frame 2, the outgoing line 3, the coil 4, the magnetic conduction ring 5, the vortex ring 6, the heat dissipation hole 7, the right shell 8, the magnetic resistance groove 9, the rotating shaft 10, the heat dissipation ring 11, the left shell 12, the screw 13 and the circular boss 14.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific examples:

as shown in fig. 1 to 6, a stator and a rotor are provided in the housing.

The shell is formed by fixedly connecting a left shell 12 and a right shell 8 in a involution manner through a screw 13; the inner walls of the left shell 12 and the right shell 8 are respectively provided with a circular boss 14 which is coaxially arranged, and the end surfaces of the circular bosses are provided with a plurality of reluctance grooves 9 which are uniformly distributed along the radial direction.

The stator is composed of a magnetic conducting ring 5 positioned in a right shell 8, a plurality of (twelve in the embodiment) magnetic steels 1 uniformly distributed and adsorbed on the peripheral surface of the magnetic conducting ring, an electromagnetic winding positioned on the right side of the magnetic conducting ring 5 and fixed in the right shell 8, and another electromagnetic winding positioned on the left side of the magnetic conducting ring 5 and fixed in a left shell 12; the two electromagnetic windings are composed of an iron core frame 2 which is fixed on the outer circumferential surface of a corresponding circular boss 14 and has a spoke-shaped structure, and coils 4 which are respectively wound on each spoke (twenty-four spokes in the embodiment) in the same direction and are sequentially connected in series, and leads 3 of the first coil 4 and the second coil 4 respectively extend outwards from corresponding shells (the 'shells' refer to a left shell 12 or a right shell 8). The magnetic conduction ring 5 can conduct magnetism and also can play a role in supporting the magnetic steel 1; in order to facilitate fixing of the magnetic steel 1, the outer peripheral surface of the magnetic conductive ring 5 adopts a regular polygon structure (in this embodiment, a dodecagon shape, see fig. 3).

The rotor is formed by a shaft 10 supported in a housing by bearings (not shown), a heat-dissipating ring 11 located in the magnetic ring 5 and fixed to the shaft, and swirl rings 6 fixed to the left and right sides of the heat-dissipating ring, respectively.

In order to ensure reliable installation of the magnetic conducting ring 5, the two pole faces ("N-pole" and "S-pole") of the magnetic steel 1 are arranged obliquely with respect to the rotary shaft 10 (see fig. 1).

In order to ensure that the electromagnetic fields generated by the two electromagnetic windings are consistent in direction and magnetic field intensity, the two electromagnetic windings are preferably connected in series.

For rapid heat dissipation, heat dissipation holes 7 are formed in the heat dissipation ring 11, and in the left housing 12 and the right housing 8 at positions corresponding to the heat dissipation ring.

When the torque sensor is used, the tested motor connected with the torque sensor is connected with the rotating shaft 10 through the coupler, and the torque (load) of the tested motor can be measured through the torque sensor by starting the tested motor to drive the rotor to rotate.

Working principle: the magnetic force lines emitted from the pole of the magnetic steel 1N sequentially pass through the left shell 12 (or/and the right shell 8) and the pole shoe to form a non-uniform magnetic field, then sequentially pass through the vortex ring 6, the heat dissipation ring 11 and the magnetic conduction ring 5 to return to the S pole of the magnetic steel 1 to form a closed loop, and the magnetic conduction ring 5 rotates (supposedly clockwise) under the drive of a tested motor and cuts the magnetic force lines. According to the right hand rule, downward eddy currents are induced in the left magnetic conductive ring 5, and upward eddy currents are induced in the left magnetic conductive ring 5; it is also known from the left hand rule that a resistive torque opposite to the direction of rotation (counterclockwise) is created on the outer circumferential surfaces of the two magnetically permeable rings 5. When the magnetic field intensity of the magnetic steel 1 needs to be changed, only the current intensity and the direction of the electromagnetic winding need to be changed; according to the right-hand spiral rule, an electromagnetic field with the same or opposite direction to the fixed magnetic field of the magnetic steel 1 can be formed at two ends of each coil 4, so that the fixed magnetic field of the magnetic steel 1 can be enhanced or weakened, and the load of the motor to be tested can be changed.

Claims

1. A motor test variable load device comprises a stator and a rotor in a housing; the method is characterized in that:

The shell is formed by involution and fixation of a left shell (12) and a right shell (8), the inner walls of the left shell (12) and the right shell (8) are respectively provided with a circular boss (14) which is coaxially arranged, and the end surfaces of the circular bosses are provided with a plurality of reluctance grooves (9) which are uniformly distributed along the radial direction;

The stator is composed of a magnetic conduction ring (5) positioned in the shell, a plurality of magnetic steels (1) uniformly distributed and adsorbed on the outer circumferential surface of the magnetic conduction ring, and electromagnetic windings respectively positioned at two sides of the magnetic conduction ring (5), wherein each electromagnetic winding is composed of an iron core frame (2) which is fixed on the outer circumferential surface of a corresponding circular boss (14) and has a spoke-shaped structure, and a plurality of coils (4) which are wound on each spoke and are sequentially connected in series;

The rotor consists of a rotating shaft (10) supported in the shell, a heat dissipation ring (11) positioned in the magnetic conduction ring (5) and fixed on the rotating shaft, and vortex rings (6) respectively fixed on two sides of the heat dissipation ring;

two magnetic pole surfaces of the magnetic steel (1) are obliquely arranged relative to the rotating shaft (10), the magnetic pole directions corresponding to the two electromagnetic windings are the same, and a plurality of heat dissipation holes (7) are formed in the heat dissipation ring (11) and the position corresponding to the heat dissipation ring on the shell.

2. The motor test variable load device of claim 1, wherein: the peripheral surface of the magnetic conduction ring (5) is of a regular polygon structure.