Rotor assembly of stepping motor with high material utilization rate and stepping motor thereof

Abstract

The utility model relates to a material high utilization rate type stepping motor rotor assembly and a stepping motor thereof, the stepping motor rotor assembly comprises a rotating shaft, three rotor iron cores are fixed on the rotating shaft in sequence, and the magnetic pole of the rotor iron core in the middle is opposite to the magnetic poles of the rotor iron cores on the two sides. According to the scheme, a rotor structure is changed from a conventional two-section four-iron-core structure with a magnetic isolation sheet in the middle into a two-section three-iron-core structure without a magnetic isolation sheet in the middle, so that the axial size of the motor is reduced, the height of the stator iron core is reduced, and the height of a motor body is reduced. Under the condition that used materials are reduced, the same output torque performance is achieved, the product material cost is reduced, and the use and installation space of customers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of stepper motor manufacturing, in particular to a rotor assembly of a stepper motor with high material utilization rate and the stepper motor. Background Art

[0002] Conventional stepper motors feature four rotor cores mounted on a single shaft. The magnetic poles of adjacent rotor cores are opposite, and magnetic shielding plates are installed on the two center rotor cores. However, the presence of four rotor cores and the installation of magnetic shielding plates in current stepper motor rotors results in a longer axial dimension, higher rotor material consumption, and lower motor manufacturing efficiency. Utility Model Content

[0003] The purpose of the present utility model is to provide a rotor assembly of a stepper motor with high material utilization and a stepper motor thereof, so as to solve the problems encountered in the above-mentioned background technology.

[0004] To achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A rotor assembly of a stepping motor with high material utilization rate comprises a rotating shaft. Three rotor cores are fixed on the rotating shaft in sequence, and the magnetic pole of the rotor core in the middle is opposite to the magnetic poles of the rotor cores on both sides.

[0006] In the above scheme, the three rotor cores are respectively the first N-pole core, the first S-pole core, and the second N-pole core, and the first N-pole core, the first S-pole core, and the second N-pole core are fixed on the rotating shaft in sequence; wherein the first S-pole core located in the middle has magnetic poles opposite to those of the first N-pole core and the second N-pole core.

[0007] Furthermore, a first magnetic steel is provided between the first N-pole core and the first S-pole core, and a second magnetic steel is provided between the first S-pole core and the second N-pole core.

[0008] As a preferred solution, the thickness of the first S-pole core is not less than the thickness of the first N-pole core.

[0009] A stepping motor, wherein the rotor assembly of the stepping motor adopts the rotor assembly of the stepping motor with high material utilization rate.

[0010] Compared with existing technologies, the present invention offers the following advantages: by changing the rotor structure from the conventional two-section, four-piece iron core with a magnetic separator in the middle to a two-section, three-piece iron core without a magnetic separator in the middle, the motor's axial dimensions are reduced, while the stator core height is also reduced, resulting in a shorter motor body. This reduces material usage while achieving the same output torque performance, lowering product material costs and reducing installation space required by customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0012] Figure 1 It is a schematic diagram of the structure of a rotor assembly in the prior art;

[0013] Figure 2 This is a schematic diagram of the rotor assembly structure in the present utility model.

[0014] Numbers in the figure: 1-rotating shaft; 2-first N-pole iron core; 3-first S-pole iron core; 4-second N-pole iron core; 5-second S-pole iron core; 6-first magnetic steel; 7-magnetic isolation plate; 8-second magnetic steel. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention will now be further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the relevant components of the present invention.

[0016] According to the technical solution of the present invention, without changing the essential spirit of the present invention, those skilled in the art may propose a variety of interchangeable structural methods and implementation methods. Therefore, the following specific embodiments and drawings are merely illustrative of the technical solution of the present invention and should not be regarded as the entire present invention or as a limitation or restriction of the technical solution of the present invention.

[0017] The technical solution of the present utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 The figure shows an example of a rotor assembly in the prior art. Simply put, a rotor shaft 1 is provided with four cores, namely, a first N-pole core 2, a first S-pole core 3, a second N-pole core 4, and a second S-pole core 5. A magnetic barrier 7 is provided between the first S-pole core 3 and the second N-pole core 4, located in the middle. A first magnetic steel 6 is provided between the first N-pole core 2 and the first S-pole core 3. A second magnetic steel 8 is provided between the second N-pole core 4 and the second S-pole core 5.

[0019] The present invention is based on the rotor assembly in the prior art and reconfigures the rotor core, as shown in the following embodiments:

[0020] Example 1, as Figure 2As shown, a rotor assembly of a high-material utilization stepper motor includes a rotating shaft 1, on which three rotor cores are fixed in sequence, and the magnetic poles of the rotor core in the middle are opposite to the magnetic poles of the rotor cores on both sides.

[0021] Specifically, the three rotor cores are a first N-pole core 2, a first S-pole core 3, and a second N-pole core 4. These are fixed sequentially to the rotating shaft 1. In practice, a keyway is typically provided in the central fixing hole of each core, and a pin keyway is provided in the rotating shaft 1, with the two being secured together using a pin key.

[0022] The first S-pole core 3, located in the middle, has opposite magnetic poles to the first N-pole core 2 and the second N-pole core 4. The polarity of the first S-pole core 3 is S, while the polarities of the first N-pole core 2 and the second N-pole core 4 are both N. According to the magnetic principle that like poles repel and opposite poles attract, the first S-pole core 3 is attracted to the first N-pole core 2 and the second N-pole core 4.

[0023] In order to isolate the iron cores with different magnetic properties on the rotating shaft 1 , a first magnetic steel 6 is provided between the first N-pole iron core 2 and the first S-pole iron core 3 , and a second magnetic steel 8 is provided between the first S-pole iron core 3 and the second N-pole iron core 4 .

[0024] As a preferred solution, the thickness of the first S-pole core 3 is not less than the thickness of the first N-pole core 2. When the thickness of the first S-pole core 3 is equal to the thickness of the first N-pole core 2, the height of the motor can be minimized. When the thickness of the first S-pole core 3 is equal to the thickness of two first N-pole cores 2, the height of the motor can be achieved as it would with two S-pole cores.

[0025] Example 2, a stepper motor, wherein the rotor assembly of the stepper motor adopts the rotor assembly of the stepper motor with high material utilization rate.

[0026] When this improved rotor assembly is used in a stepper motor, the rotor structure is changed from the conventional two-segment, four-piece iron core with a magnetic separator in the middle to a two-segment, three-piece iron core without a magnetic separator in the middle. This reduces the motor's axial dimensions and the stator core height, resulting in a shorter motor body. This reduces material usage while achieving the same output torque performance, lowering product material costs and reducing customer installation space.

[0027] Therefore, the present invention improves the rotor structure from a four-piece rotor core to a two-section rotor core by improving the rotor manufacturing efficiency; the rotor structure is changed from a magnetic isolation plate to a non-magnetic isolation plate, reducing the axial length of the rotor, and at the same time the manufacturing efficiency of the rotor without a magnetic isolation plate is also improved; the magnetic leakage of the rotor with a magnetic isolation plate between the two sections of the core will be greater than the magnetic leakage of the rotor without a magnetic isolation plate between the two sections, and under the same rotor core thickness, the performance of the rotor without a magnetic isolation plate is better; in addition, by removing the magnetic isolation plate from the rotor, the rotor core utilization rate is higher, and the motor torque of the same height can be made greater.

[0028] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. These undisclosed elements are all prior art known to those skilled in the art.

[0029] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A rotor assembly of a stepping motor with high material utilization rate, comprising a rotating shaft (1), characterized in that: Three rotor cores are fixed in sequence on the rotating shaft (1), and the magnetic poles of the rotor core in the middle are opposite to the magnetic poles of the rotor cores on both sides.

2. The rotor assembly of a stepping motor with high material utilization rate according to claim 1, characterized in that: The three rotor cores are respectively a first N-pole core (2), a first S-pole core (3), and a second N-pole core (4); the first N-pole core (2), the first S-pole core (3), and the second N-pole core (4) are fixed on the rotating shaft (1) in sequence; wherein the first S-pole core (3) located in the middle has magnetic poles opposite to those of the first N-pole core (2) and the second N-pole core (4).

3. The rotor assembly of a stepping motor with high material utilization rate according to claim 2, characterized in that: A first magnetic steel (6) is provided between the first N-pole iron core (2) and the first S-pole iron core (3), and a second magnetic steel (8) is provided between the first S-pole iron core (3) and the second N-pole iron core (4).

4. The rotor assembly of a stepping motor with high material utilization rate according to claim 2, characterized in that: The thickness of the first S-pole iron core (3) is not less than the thickness of the first N-pole iron core (2).

5. A stepping motor, characterized in that: The rotor assembly in the stepper motor adopts a rotor assembly of a stepper motor with high material utilization as described in any one of claims 1 to 4.

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