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CN-224218181-U - Plastic shell motor structure

CN224218181UCN 224218181 UCN224218181 UCN 224218181UCN-224218181-U

Abstract

The utility model belongs to the technical field of brushless motors, in particular to a plastic shell motor structure, which comprises a rotor and a stator, wherein the plastic shell comprises an integrally injection molded plastic shell, the radial section of the plastic shell is in a W shape, the plastic shell comprises a shell part and a separation part, the shell part and the separation part are completely separated, openings for assembling the rotor and the stator are formed in one side opposite to the shell part, when the stator and the rotor are fixed by the plastic shell, the stator and the rotor are separated, due to the rigid design of the plastic shell, the accurate positioning of the stator and the rotor can be ensured, the uniform air gap between the stator and the rotor is ensured, the vibration, the noise and the efficiency reduction caused by eccentricity are avoided, the plastic shell can enhance the insulation grade, can meet the double insulation design, can achieve larger power under the same condition, and meets the safety requirements of an electric gap even when the power of a motor is increased around more enamelled wires, so that the stator can safely operate under higher power.

Inventors

  • XU ALAN

Assignees

  • 易助电机（苏州）有限公司

Dates

Publication Date
20260508
Application Date
20250415

Claims (5)

  1. 1. The utility model provides a plastic shell motor structure, includes rotor (4) and stator (6), its characterized in that includes integrative injection moulding's plastic shell (1), the radial cross-section of plastic shell (1) is "W" shape, plastic shell (1) are including shell portion (101) and isolation portion (102) with rotor (4) and stator (6) complete isolation, the opposite side of shell portion (101) and isolation portion (102) is equipped with the opening that is used for rotor (4) and stator (6) assembly, isolation portion (102) inboard is formed with support rib (7) to stator (6) outside support, have the air current clearance between stator (6) inboard and isolation portion (102).
  2. 2. A plastic shell motor structure according to claim 1, wherein the opening on one side of the isolation part (102) is provided with a first end cover (2), a rotary output shaft (3) is arranged between the isolation part (102) and the first end cover (2), and the rotor (4) is arranged outside the output shaft (3) and is wrapped by the isolation part (102) and the first end cover (2).
  3. 3. The plastic shell motor structure according to claim 1, wherein a second end cover (5) is arranged at one side opening of the shell part (101), a groove axially jogged with the end part of the isolation part (102) is formed at the center of the second end cover (5), and the shell part (101), the isolation part (102) and the second end cover (5) form a package on the stator (6).
  4. 4. The plastic shell motor structure according to claim 2, wherein a first bearing (8) and an inner ring of a second bearing (9) are fixed outside the output shaft (3), the outer end of the first bearing (8) is fixed with the first end cover (2), and the outer ring of the second bearing (9) is fixed with the inner bottom of the isolation part (102).
  5. 5. A plastic shell motor structure according to claim 1, wherein the rotor (4) and the stator (6) are coaxial and in the same plane.

Description

Plastic shell motor structure Technical Field The utility model belongs to the technical field of brushless motors, and particularly relates to a plastic shell motor structure. Background Brushless motor is a high-efficiency motor based on electronic commutation technology, and its development background can be traced back to the technical bottleneck of the traditional brush motor in the middle of 20 th century. The traditional brush motor realizes current direction switching through a mechanical brush and a commutator, but has the problems of brush abrasion, large electromagnetic interference, limited efficiency and the like. With breakthrough of power electronic technology, permanent magnet materials and microprocessor control, the brushless motor adopts a Hall sensor or a sensor less algorithm, and the phase of winding current is regulated in real time through a controller, so that the crossing from mechanical commutation to electronic commutation is realized, and the reliability and the energy conversion efficiency are remarkably improved; As shown in fig. 1, a conventional brushless motor adopts a double-ended support structure in which a metal case and two end caps directly fix a rotor, and as the bearings 500 are fixed in two front and rear end caps 400, the rotor is rotatably installed in the end caps 400 through the two bearings 500, and a stator 200 is assembled in the metal case 100, the structure has the following drawbacks: 1. The machining error is easy to cause air gap unevenness of more than 0.1mm, and electromagnetic vibration (the fundamental frequency is the product of the pole pair number and the rotating speed) is induced; 2. the accumulated tolerance of the assembly of multiple components influences the effect of the rotor after dynamic balance (the dynamic balance grade is G6.3 grade). In order to solve the above problems, the present application provides a plastic shell motor structure. Disclosure of utility model In order to solve the problems in the prior art, the utility model provides a plastic shell motor structure which has the characteristics of light weight, noise reduction, durability and cost reduction. In order to achieve the aim, the technical scheme is that the plastic shell motor structure comprises a rotor and a stator, and comprises a plastic shell which is integrally injection molded, wherein the radial section of the plastic shell is in a W shape, the plastic shell comprises a shell part and a separation part which completely separate the rotor from the stator, an opening for assembling the rotor and the stator is formed in one side opposite to the shell part and the separation part, supporting ribs for supporting the outer side of the stator are formed in the inner side of the separation part, and an airflow gap is formed between the inner side of the stator and the separation part. As a preferable technical scheme of the utility model, the first end cover is arranged at the opening at one side of the isolating part, a rotary output shaft is arranged between the isolating part and the first end cover, and the rotor is arranged outside the output shaft and is wrapped by the isolating part and the first end cover. As a preferable technical scheme of the utility model, a second end cover is arranged at one side opening of the shell part, a groove axially jogged with the end part of the isolation part is formed at the center of the second end cover, and the shell part, the isolation part and the second end cover form a package for the stator. As a preferable technical scheme of the utility model, a first bearing and an inner ring of a second bearing are fixed outside the output shaft, the outer end of the first bearing is fixed with a first end cover, and the outer ring of the second bearing is fixed with the bottom of the inner side of the isolation part. As a preferable technical scheme of the utility model, the rotor and the stator are coaxial and are in the same plane. Compared with the prior art, the utility model has the beneficial effects that: 1. When the stator and the rotor are fixed by the plastic shell, the stator and the rotor are separated, and due to the rigid design of the plastic shell, the accurate positioning of the stator and the rotor can be ensured, the uniform air gap between the stator and the rotor is ensured, and vibration, noise and efficiency reduction caused by eccentricity are avoided; 2. The stator meets the safety requirement of an electric gap even when the power of the motor is increased around more enameled wires, so that the motor can safely and safely run under higher power; 3. The elastic characteristic of the plastic can absorb vibration caused by electromagnetic force or mechanical unbalance, and compared with the traditional metal shell, the high-frequency noise can be reduced; 4. The plastic shell can prevent dust, liquid or chemical substances from invading the stator and rotor gap, can also improve corrosion resistance, and t