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CN-224233449-U - Miniature silence step motor

CN224233449UCN 224233449 UCN224233449 UCN 224233449UCN-224233449-U

Abstract

The utility model discloses a miniature mute stepping motor, which comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises a shell, a wire frame and a polar plate, the rotor assembly comprises a central shaft and a magnetic ring structure fixed on the central shaft, and the magnetic ring structure comprises a magnetic ring frame fixed on the central shaft and magnetic rings respectively fixed at two ends of the magnetic ring frame. The utility model solves the problems of large noise and unstable low speed of the traditional stepping motor through innovative double-head magnetic ring structure, integrated polar plate wire frame design, novel tooth shape design and high-performance material application, has the characteristics of silence, high efficiency and compactness, and is suitable for high-precision automatic equipment.

Inventors

  • HU LIXIANG

Assignees

  • 方德微特电机(丽水)有限公司

Dates

Publication Date
20260512
Application Date
20250605

Claims (7)

  1. 1. The miniature mute stepping motor is characterized by comprising a stator assembly and a rotor assembly, wherein the stator assembly comprises a machine shell (1), a wire frame (2) and a pole plate (3), the rotor assembly comprises a central shaft (4) and a magnetic ring structure (5) fixed on the central shaft (4), and the magnetic ring structure (5) comprises a magnetic ring frame (51) fixed on the central shaft (4) and magnetic rings (52) respectively fixed at two ends of the magnetic ring frame (51).
  2. 2. The miniature mute stepper motor as claimed in claim 1, wherein two pole plates (3) are respectively located at the outer sides of the two magnetic rings (52), bases of the two pole plates (3) are overlapped and fixed together, pole plate teeth (31) are respectively located at the outer ends of the corresponding magnetic rings (52), each pole frame (2) comprises two pole frame monomers (21) respectively arranged at the outer sides of the pole plate teeth (31), the two pole frame monomers (21) are fixedly connected together, bases of the two pole plates (3) are located between the two pole frame monomers (21), a coil winding area (22) is arranged on each pole frame monomer (21), coils (23) are wound in the coil winding area (22), two pole plates (3) are respectively located at the outer sides of the two pole plates, and casing teeth (11) matched with the pole plate teeth (31) at the inner sides are respectively arranged in the two pole plates (1).
  3. 3. The miniature mute stepping motor according to claim 2, wherein the wire frame (2) is made of plastic, the pole plate (3) is made of metal, and the wire frame (2) and the pole plate (3) are integrally formed.
  4. 4. A miniature mute stepper motor as claimed in claim 3, wherein the magnetic ring (52) is made of a high-performance neodymium-iron-boron permanent magnet material.
  5. 5. The miniature mute stepper motor of claim 4, wherein the residual magnetism of the high-performance neodymium iron boron permanent magnet material is 0.6-0.8T, the coercive force is 300-500 kA/m, and the maximum energy product is 60-90 kJ/m3.
  6. 6. The miniature mute stepper motor as claimed in claim 5, wherein the pole pair number of the magnetic ring (52) is 5-7 pairs, the outer diameter is 5.5-7.5 mm, and the thickness is 0.8-1.8 mm.
  7. 7. The miniature mute stepper motor as claimed in claim 2, wherein the tooth shapes of the pole plate teeth (31) and the casing teeth (11) are multi-section line tooth shapes, the multi-section line tooth shapes comprise tooth roots (a), tooth surfaces (b) and tooth tops (c), the tooth surfaces (b) are formed by circular arcs with middle parts protruding outwards and straight line sections connected to two ends of the circular arcs, the circular arcs are tangent to the straight line, the tops of the tooth surfaces (b) are connected with tooth tops (c) through tooth surface chamfer angles, and the bottoms of the tooth surfaces (b) are connected with tooth roots (a) through tooth surface draft angles.

Description

Miniature silence step motor Technical Field The utility model relates to a miniature mute stepping motor. Background The stepping motor is widely applied to various automatic control systems, and the traditional stepping motor is generally composed of a motor coil, a motor shell, polar plates, a circular multi-pole magnetic ring and the like. After the motor coil is electrified, a magnetic field is generated, and different magnetic poles are generated between the shell and the polar plate to interact with the circular multipolar magnetic ring for power transmission. The magnetic ring of the traditional stepping motor is usually of an integral structure, the magnetic field of the integral magnetic ring is uniformly distributed, so that the magnetic resistance is suddenly changed when tooth grooves of a stator and a rotor are aligned, obvious tooth groove torque is generated, low-speed stability is influenced, and large vibration, high noise and use experience are often caused under the same electromagnetic torque. Disclosure of utility model Aiming at the problems, the utility model provides a miniature mute stepping motor, which ensures that a stator magnetic field and a rotor magnetic field are cut smoothly through the design of double-head magnetic rings and special casing pole plate tooth shapes, so that cogging torque is obviously weakened, and the problems pointed out in the background technology are effectively solved. The technical scheme adopted by the utility model is as follows: the miniature mute stepping motor comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises a machine shell, a wire frame and polar plates, the rotor assembly comprises a central shaft and a magnetic ring structure fixed on the central shaft, and the magnetic ring structure comprises a magnetic ring frame fixed on the central shaft and magnetic rings respectively fixed at two ends of the magnetic ring frame. Preferably, the two pole plates are respectively positioned at the outer sides of the two magnetic rings, the bases of the two pole plates are overlapped and fixed together, pole plate teeth are respectively oriented to the outer ends of the corresponding magnetic rings, the wire frame comprises two wire frame monomers which are respectively arranged at the outer sides of the pole plate teeth, the two wire frame monomers are fixedly connected together, the bases of the two pole plates are positioned between the two wire frame monomers, a coil winding area is arranged on the wire frame monomers, coils are wound in the coil winding area, two machine shells are respectively positioned at the outer sides of the two pole plates, and machine shell teeth matched with the inner pole plate teeth are respectively arranged in the machine shells. Preferably, the wire frame is made of plastic, the polar plate is made of metal, and the wire frame and the polar plate are integrally formed. Preferably, the magnetic ring is made of high-performance neodymium iron boron permanent magnet material. Preferably, the residual magnetism of the high-performance neodymium iron boron permanent magnet material is 0.6-0.8T, the coercive force is 300-500 kA/m, and the maximum energy product is 60-90 kJ/m3. Preferably, the pole pair number of the magnetic ring is 5-7 pairs, the outer diameter is 5.5-7.5 mm, and the thickness is 0.8-1.8 mm. Preferably, the tooth shapes of the polar plate teeth and the casing teeth are multi-section line tooth shapes, the multi-section line tooth shapes comprise tooth roots, tooth surfaces and tooth tops, the tooth surfaces are formed by circular arcs with outwards protruding middle parts and straight line sections connected to two ends of the circular arcs, the circular arcs are tangent to the straight lines, the tops of the tooth surfaces are connected with the tooth tops through tooth surface chamfer angles, and the bottoms of the tooth surfaces are connected with the tooth roots through tooth surface draft angles. The innovation points of the utility model are as follows: 1. Double-end magnetic ring design: The traditional stepping motor adopts an integral magnetic ring, the magnetic field is distributed uniformly, so that cogging torque is suddenly changed, the low-speed stability is affected, the utility model adopts a double-head magnetic ring structure fixed at two ends of a magnetic ring frame, the distribution of the magnetic field is changed in a stepwise manner, so that cogging torque is obviously weakened, running stability is improved, the layout of the double magnetic rings optimizes magnetic field interaction, and abrupt change of magnetic resistance is reduced, so that vibration and noise are reduced; 2. pole plate and wire frame integrated design: The pole plate bases are overlapped and fixed, pole plate teeth face the outer ends of the corresponding magnetic rings respectively, the wire frame monomers are arranged on the outer sides of the pole plate teeth and are fixe