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CN-224218183-U - Polar plate structure of stepping motor shell

CN224218183UCN 224218183 UCN224218183 UCN 224218183UCN-224218183-U

Abstract

The utility model discloses a stepping motor shell polar plate structure, which comprises a pair of polar plates and a pair of shells, wherein the two shells form a motor shell, the two polar plates are arranged in the two shells, bases of the two polar plates are overlapped and fixed together and are arranged at the center of the motor shell, a circle of shell teeth extending vertically towards the center of the motor shell are fixed on the two shells, polar plate teeth matched with the shell teeth are fixed on the two polar plates, the tooth shapes of the polar plate teeth and the shell 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 arc lines with the middle parts protruding outwards, and straight line sections connected to the two ends of the circular arc lines, the circular arc lines are tangent to the straight line sections, the top of each tooth surface is connected with the tooth tops through tooth surface chamfer angles, and the bottom of each tooth surface is connected with tooth roots through tooth surface draft angles. According to the utility model, through smooth transition of the multi-section line tooth shape and synchronous design of the polar plate tooth and the shell tooth, the static cogging torque and running vibration are obviously reduced, and the mute scene requirement is met.

Inventors

  • HU LIXIANG

Assignees

  • 方德微特电机(丽水)有限公司

Dates

Publication Date
20260508
Application Date
20250605

Claims (6)

  1. 1. The utility model provides a step motor casing polar plate structure, its characterized in that includes a pair of polar plate (1) and a pair of casing (2), two casing (2) form motor casing, two polar plate (1) set up two casing (2) in, two the base of polar plate (1) is overlapped and is fixed together and set up in motor casing's center, two casing (2) all be fixed with perpendicular to motor casing center one circle casing tooth (21) that stretches out, two polar plate (1) on fixed with casing tooth (21) assorted polar plate tooth (11), polar plate tooth (11) are the multisection line profile of tooth with casing tooth (21), the multisection line profile of tooth include tooth root (31), tooth face (32) and tooth top (33), the shape of tooth face (32) comprises the circular arc line that the middle part outwards protrudes to and the straightway that connects at the circular arc line both ends, circular arc line and straightway tangent, the top of tooth face (32) pass through tooth face and tooth face (33) and tooth face (31) and tooth bottom are continuous with the fillet die corner (33).
  2. 2. The pole plate structure of a stepper motor housing according to claim 1, wherein the tooth bottom width of the multi-section tooth form is 1.12-1.18 times of the single-stage air gap field width.
  3. 3. The plate structure of claim 1, wherein the tooth face draft angle is at an angle of 。
  4. 4. The plate structure of claim 1, wherein the tooth height of the multi-segment tooth form is 0.4-0.42 times the diameter of the air gap.
  5. 5. A stepper motor housing plate structure according to claim 1, characterized in that the arc line of the tooth surface (32) is the maximum outer diameter arc tangent to the straight line segment of the tooth surface (32) and connecting the tooth tip (33).
  6. 6. A stepper motor housing plate structure as defined in claim 1, wherein the top of the multi-segment line profile is tangent to the tooth surface (32) with a minimum manufacturable fillet.

Description

Polar plate structure of stepping motor shell Technical Field The utility model relates to a polar plate structure of a shell of a stepping motor. Background The casing and the polar plate of the traditional stepping motor are generally in an equal-division design, and the tooth shape is triangular or trapezoidal, so that the following problems exist in the design: 1. The static cogging torque is large, namely, the cogging torque is remarkable when the motor is static due to sharp tooth shapes or uneven magnetic field distribution and influences the positioning accuracy; 2. the traditional tooth form is easy to cause periodic vibration during operation, and especially can resonate with other parts in a mute scene, so that the reliability of the system is reduced. In the prior art, although individual schemes improve torque by optimizing tooth shapes, the torque is limited to local modification (such as chamfering and sharpening), and fundamental improvement cannot be realized by reconstructing the whole tooth shape. Disclosure of utility model In order to solve the problems, the utility model provides a polar plate structure of a shell of a stepping motor, which effectively solves the problems pointed out in the background art. The technical scheme adopted by the utility model is as follows: The utility model provides a step motor casing polar plate structure, includes a pair of polar plate and a pair of casing, two the casing form motor casing, two the polar plate set up two in the casing, two the base of polar plate is overlapped and is fixed together and set up in motor casing's center, two the casing all be fixed with the round casing tooth that stretches out perpendicularly to motor casing center, two the polar plate on fixed with casing tooth assorted polar plate tooth, the tooth profile of polar plate tooth and casing tooth is the multisection line profile of tooth, the multisection line profile of tooth include tooth root, tooth face and tooth top, the shape of tooth face comprises the outside bellied circular arc line in middle part to and connect the straightway at the circular arc line both ends and constitute, circular arc line and straightway are tangent, the top of tooth face links to each other with the tooth top through the tooth face chamfer, the bottom passes through tooth face draft angle and links to each other with the tooth root. Preferably, the width of the tooth bottom of the multi-section line tooth shape is 1.12-1.18 times of the single-stage air gap magnetic field width, the single-stage air gap magnetic field width=the circumference of the air gap/the number of poles, and the circumference of the air gap refers to the circumference length at the tooth root. Preferably, the tooth surface draft angle is。 Preferably, the tooth height of the multi-section line tooth shape is 0.4-0.42 times of the air gap diameter. Preferably, the arc line of the tooth surface is a maximum outer diameter arc tangent to a straight line segment of the tooth surface and connecting the tooth tip. Preferably, the top of the multi-line tooth form is tangent to the tooth surface with the smallest manufacturable fillet, i.e., the tooth surface is rounded to the smallest manufacturable fillet. According to the utility model, through smooth transition of the multi-section line tooth shape and synchronous design of the polar plate tooth and the shell tooth, the static cogging torque and running vibration are obviously reduced, and the mute scene requirement is met. The innovation point of the utility model is that: 1. Tooth shape design of the multi-section line: The tooth shape of the traditional stepping motor is mostly triangular or trapezoidal, the magnetic field distribution is uneven, cogging torque and vibration noise are easy to cause, the technical scheme adopts a multi-section line tooth shape, and the tooth root, the tooth surface and the tooth top are connected through a smooth transition curve, so that the magnetic field distribution is optimized; The middle part of the tooth surface is outwards protruded, and the tooth top is tangentially connected with the tooth surface through a tooth surface chamfer, so that the natural transition of the magnetic field is ensured, and the concentration of the local magnetic field is reduced; the tooth height is designed to be 0.4-0.42 times of the air gap diameter, the tooth width is 1.12-1.18 times of the single-stage air gap magnetic field width, and the magnetic field uniformity is further improved through optimization of geometric parameters; 2. The synchronous design of the polar plate teeth and the shell teeth: The pole plate teeth synchronously rotate for a step angle relative to the casing teeth, so that the stator teeth and the rotor teeth always keep magnetic circuit symmetry in the moving process, and step torque change is avoided. The utility model has the beneficial effects that: 1. significantly reducing static cogging torque: The multi-section lin