Novel hybrid linear stepping motor

Abstract

The utility model discloses a novel hybrid linear stepping motor, which comprises a lead screw assembly, a front end cover, a front bearing, a stator assembly, a rotor assembly, a rear bearing and a rear end cover, the front end cover is fixed with the front bearing, the rear bearing is matched with the rear end cover, the rotor assembly is matched with the stator assembly, and two ends of the rotor assembly are respectively connected with the front bearing and the rear bearing. The screw rod assembly is connected with the rotor assembly, a plurality of first teeth are arranged on the inner circumferential surface of the stator assembly, a first tooth groove is formed between every two adjacent first teeth, a plurality of second teeth are arranged on the outer circumferential surface of the rotor assembly, a second tooth groove is formed between every two adjacent second teeth, and a part of each second tooth corresponds to the corresponding first tooth. The magnetic strip is installed in the first tooth groove, and the other part of the second tooth corresponds to the magnetic strip. According to the utility model, the phenomenon of serious flux leakage of the traditional hybrid linear stepping motor is reduced, and the motor efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a novel hybrid linear stepping motor capable of converting rotary motion into linear motion. Background Art

[0002] As the basic unit of linear motion control, linear motion mechanism is widely used in various fields of industrial production. With the development of industry and the advancement of technology, the application environment has become diversified.

[0003] In a conventional hybrid linear stepper motor, the rotor assembly 6 and the stator assembly 4 are matched as follows: Figure 1 and Figure 2 As shown in the conventional hybrid linear stepper motor stator and rotor magnetic circuit diagram, the magnetic flux reaches the tooth top of the stator component 4 with S-pole magnetism from the tooth top of the rotor component 6 with N-pole magnetism. Since the inner circumference of the stator component 4 has a plurality of first teeth 4a, a first tooth slot 4b is formed between two adjacent first teeth 4a, and the outer circumference of the rotor component 6 has a plurality of second teeth 6a, a second tooth slot 6b is formed between two adjacent second teeth 6a. However, during assembly, the second teeth 6a do not completely correspond to the first teeth 4a, that is, only a part of the second teeth 6a corresponds to the first teeth 4a, and the other part of the second teeth 6a corresponds to the first tooth slot 4b. Therefore, the above structure causes the magnetic flux not to be completely concentrated through the stator tooth top, that is, a part of the magnetic flux will be scattered outside the tooth top of the stator component 4, thereby causing magnetic leakage. The magnetic leakage part will hardly generate effective torque, resulting in low motor efficiency and failure to meet the requirements of high efficiency and small volume. This will require designers to make trade-offs between motor performance and motor volume. Utility Model Content

[0004] The utility model provides a novel hybrid linear stepping motor. The utility model reduces the serious magnetic leakage phenomenon of the traditional hybrid linear stepping motor and improves the motor efficiency.

[0005] The technical solutions to the above technical problems are as follows:

[0006] A novel hybrid linear stepper motor comprises a screw assembly, a front end cover, a front bearing, a stator assembly, a rotor assembly, a rear bearing and a rear end cover. The front end cover is fixed to the front bearing, the rear bearing cooperates with the rear end cover, the rotor assembly cooperates with the stator assembly, the two ends of the rotor assembly are respectively connected to the front bearing and the rear bearing, the screw assembly is connected to the rotor assembly, a plurality of first teeth are provided on the inner circumference of the stator assembly, a first tooth groove is formed between two adjacent first teeth, a plurality of second teeth are provided on the outer circumference of the rotor assembly, a second tooth groove is formed between two adjacent second teeth, a part of the second teeth corresponds to the first teeth, and a magnetic strip is also included. The magnetic strip is installed in the first tooth groove, and the other part of the second teeth corresponds to the magnetic strip.

[0007] Furthermore, the magnetic pole polarity of the second tooth at one end opposite to the first tooth is opposite, and the magnetic pole polarity of the magnetic strip at one end corresponding to the second tooth is the same.

[0008] Furthermore, the magnetic strip is fixed in the first tooth groove by bonding with an adhesive.

[0009] Further, the thickness of the magnetic strip is smaller than the depth of the first tooth groove.

[0010] In the utility model, the magnetic strip is installed in the first tooth slot, and the other part of the second tooth corresponds to the magnetic strip. Since the polarity of the corresponding end of the second tooth and the magnetic strip is the same, according to the principle that like poles repel each other and opposite poles attract each other, the utility model overcomes the problem in the traditional design that the magnetic flux scattered outside the first tooth is re-gathered on the first tooth to become an effective magnetic flux that generates torque, thereby increasing the additional torque. This additional torque is achieved under the same input power. It can be seen that the utility model reduces the leakage of magnetic flux in the traditional hybrid linear stepper motor and improves the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the cooperation between the existing stator assembly and the rotor assembly.

[0012] Figure 2 for Figure 1 Enlarged view of part I in .

[0013] Figure 3 This is an exploded view of the novel hybrid linear stepper motor of the utility model.

[0014] Figure 4 It is a schematic diagram of the coordination between the stator assembly and the rotor assembly in the present invention.

[0015] Figure 5 for Figure 4 Enlarged view of part P in .

[0016] Markings in the accompanying drawings:

[0017] Screw assembly 1, front end cover 2, corrugated gasket 3, front bearing 5, stator assembly 4, first tooth 4a, first tooth groove 4b, rotor assembly 6, second tooth 6a, second tooth groove 6b, rear bearing 7, rear end cover 8, magnetic strip 9. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] like Figures 3 to 5As shown, a novel hybrid linear stepper motor of the utility model includes a screw assembly 1, a front cover 2, a corrugated gasket 3, a front bearing 5, a stator assembly 4, a rotor assembly 6, a rear bearing 7, a rear cover 8, and a magnetic strip 9. A bearing chamber is provided on the front cover 2, the corrugated gasket 3 is located in the bearing chamber on the front cover 2, the front bearing 5 is located in the bearing chamber on the front cover 2, and the front cover 2 is fixed to the front bearing 5. A bearing chamber is also provided on the rear cover 8, the rear bearing 7 cooperates with the rear cover 8, the rear bearing 7 is located in the bearing chamber on the rear cover 8, and the rear bearing 7 is fixed to the rear cover 8.

[0020] The rotor assembly 6 passes through the stator assembly 4 , the rotor assembly 6 cooperates with the stator assembly 4 , the rotor assembly 6 and the stator assembly 4 have a clearance fit, the two ends of the rotor assembly 6 are respectively connected to the front bearing 5 and the rear bearing 7 , and the screw assembly 1 is connected to the rotor assembly 6 .

[0021] The stator component 4 has a plurality of first teeth 4a on its inner circumference, and a first tooth groove 4b is formed between two adjacent first teeth 4a. The rotor component 6 has a plurality of second teeth 6a on its outer circumference, and a gap is provided between the first teeth 4a and the second teeth 6a. A second tooth groove 6b is formed between two adjacent second teeth 6a, and a portion of the second teeth 6a corresponds to the first teeth 4a. The magnetic strip 9 is installed in the first tooth groove 4b, and another portion of the second teeth 6a corresponds to the magnetic strip 9.

[0022] The magnetic pole polarity of the second tooth 6a and the end corresponding to the first tooth 4a is opposite, and the magnetic pole polarity of the magnetic strip 9 and the end corresponding to the second tooth 6a is the same. For example, the magnetic pole polarity of one end of the first tooth 4a is S pole, the magnetic pole polarity of one end of the second tooth 6a is N pole, and the magnetic pole polarity of one end of the magnetic strip 9 is N pole.

[0023] The magnetic strip 9 is fixed in the first tooth slot 4b by bonding with an adhesive, for example, the magnetic strip 9 is fixed in the first tooth slot 4b by bonding with a glue agent. The thickness of the magnetic strip 9 is less than the depth of the first tooth slot 4b. This structure ensures the gap between the stator assembly 4 and the rotor assembly 6. Preferably, the thickness of the magnetic strip 9 is four fifths of the depth of the first tooth slot 4b.

[0024] In the utility model, a parallel magnetized permanent magnet strip 9 is inserted into the first tooth slot 4b, and the magnetic pole polarity of the magnetic strip 9 and the end corresponding to the second tooth 6a are the same. According to the principle that like poles repel each other and opposite poles attract each other, almost all the magnetic flux reaches the tooth top of the stator component 4 with S pole magnetism from the tooth top of the rotor component 6 with N pole magnetism, forming an effective magnetic flux, increasing the attraction between the stator and the rotor, improving the additional torque, and increasing the motor performance.

Claims

1. A novel hybrid linear stepper motor, comprising a screw assembly (1), a front end cover (2), a front bearing (5), a stator assembly (4), a rotor assembly (6), a rear bearing (7), and a rear end cover (8), wherein the front end cover (2) is fixed to the front bearing (5), the rear bearing (7) is matched with the rear end cover (8), the rotor assembly (6) is matched with the stator assembly (4), the two ends of the rotor assembly (6) are respectively connected to the front bearing (5) and the rear bearing (7), the screw assembly (1) is connected to the rotor assembly (6), the stator assembly (4) has a plurality of first teeth (4a) on its inner circumference, and a first tooth groove (4b) is formed between two adjacent first teeth (4a), the rotor assembly (6) has a plurality of second teeth (6a) on its outer circumference, and a second tooth groove (6b) is formed between two adjacent second teeth (6a), and a part of the second tooth (6a) corresponds to the first tooth (4a), characterized in that: It also includes a magnetic strip (9), which is installed in the first tooth groove (4b), and another part of the second tooth (6a) corresponds to the magnetic strip (9).

2. A novel hybrid linear stepper motor according to claim 1, characterized in that: The magnetic pole polarity of the second tooth (6a) and the end corresponding to the first tooth (4a) is opposite, and the magnetic pole polarity of the magnetic strip (9) and the end corresponding to the second tooth (6a) is the same.

3. A novel hybrid linear stepper motor according to claim 1, characterized in that: The magnetic strip (9) is fixed in the first tooth groove (4b) by adhesive.

4. A novel hybrid linear stepper motor according to claim 1, characterized in that: The thickness of the magnetic strip (9) is smaller than the depth of the first tooth groove (4b).

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