A stepping motor rotor and a motor having the same

Abstract

The application relates to a stepping motor rotor and a motor with the same, wherein the stepping motor rotor comprises a third rotor core, a fourth rotor core, a large-hole outer magnetic steel and a small-hole inner magnetic steel; the small-hole inner magnetic steel is embedded in the large-hole outer magnetic steel and is located between the third rotor core and the fourth rotor core; the large-hole outer magnetic steel and the small-hole inner magnetic steel are made of different magnetic materials or different grades of rare earth materials. Compared with the prior art, the application has the advantages of ensuring the performance of the motor and reducing the manufacturing cost of the motor.

Description

Technical Field

[0001] This invention relates to a stepper motor, and more particularly to a stepper motor rotor and a motor having the rotor. Background Technology

[0002] Stepper motors are characterized by low noise, high output, and good dynamic performance, making them widely used in the control field. Traditional stepper motors include claw-pole stepper motors and hybrid stepper motors.

[0003] like Figure 1-4 As shown, the existing hybrid stepper motor rotor assembly 1 includes a first rotor core 2 and a second rotor core 3, and a magnet 4 located between the two rotor cores. The first rotor core 2 and the second rotor core 3 are deflected at a certain angle in the radial direction. The magnet 4 is made of neodymium iron boron (NdFeB). However, since NdFeB is a rare earth magnet, it has problems such as high cost and low reserves. Therefore, how to replace NdFeB with a low-cost and abundant material through structural improvement while ensuring motor performance has become a technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a stepper motor rotor and a motor having the rotor.

[0005] The objective of this invention can be achieved through the following technical solutions: According to one aspect of the present invention, a stepper motor rotor is provided, comprising a third rotor core, a fourth rotor core, a large inner bore outer magnet, and a small inner bore inner magnet, wherein the small inner bore inner magnet is embedded in the large inner bore outer magnet and is located between the third rotor core and the fourth rotor core; the large inner bore outer magnet and the small inner bore inner magnet are magnets made of different magnetic materials or different grades of rare earth materials.

[0006] As a preferred technical solution, the magnetic material includes ferrite, samarium cobalt, neodymium nickel cobalt, and neodymium iron boron.

[0007] As a preferred technical solution, the rare earth materials include samarium cobalt, neodymium nickel cobalt, and neodymium iron boron, wherein the neodymium iron boron includes N35SH and N40M.

[0008] As a preferred technical solution, the inner magnet with the small inner hole and the outer magnet with the large inner hole have the same thickness.

[0009] As a preferred technical solution, the thickness of the inner magnet in the small inner hole is greater than that of the outer magnet in the large inner hole.

[0010] As a preferred technical solution, both the third rotor core and the fourth rotor core include a large inner hole rotor core and a small inner hole rotor core, wherein the small inner hole rotor core is assembled on the outside of the large inner hole rotor core.

[0011] As a preferred technical solution, the large inner hole rotor iron chip is assembled with the small inner hole inner magnet.

[0012] As a preferred technical solution, the magnet inside the small inner hole is a magnet made of ferrite.

[0013] As a preferred technical solution, the large inner hole external magnet is a magnet made of neodymium iron boron (NdFeB).

[0014] According to another aspect of the present invention, an electric motor having a stepper motor rotor is provided, comprising a stator and a rotor, the rotor being the stepper motor rotor described above.

[0015] Compared with the prior art, the present invention has the following advantages: by adjusting the design of the rotor core assembly, some of the high-cost and low-supply neodymium iron boron is replaced with low-cost and abundant magnetic materials such as ferrite, which not only ensures that the performance of the motor remains unchanged and reduces the consumption of neodymium iron boron, but also reduces the manufacturing cost of the motor. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of an existing hybrid stepper motor rotor assembly; Figure 2 This is a schematic diagram of the front view structure of an existing hybrid stepper motor rotor assembly; Figure 3 for Figure 2 AA section view; Figure 4 This is an exploded structural diagram of an existing hybrid stepper motor rotor assembly. Figure 5 This is a three-dimensional structural diagram of Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the main structure of Embodiment 1 of the present invention; Figure 7 for Figure 6 BB cross-sectional view; Figure 8 This is a schematic diagram of the exploded structure of Embodiment 1 of the present invention; Figure 9 This is a three-dimensional structural schematic diagram of Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of the main structure of Embodiment 2 of the present invention; Figure 11 for Figure 10 CC section view; Figure 12 This is a schematic diagram of the exploded structure of Embodiment 2 of the present invention; 1 is the existing hybrid stepper motor rotor assembly, 2 is the first rotor core, 3 is the second rotor core, and 4 is the magnet; 5 and 10 are stepper motor rotors, 6 is the third rotor core, 7 is the fourth rotor core, 8 and 15 are large inner hole outer magnets, 9 and 16 are small inner hole inner magnets, 12 and 13 are large inner hole rotor cores, and 11 and 14 are small inner hole rotor cores. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0018] Example 1 like Figure 5-8 As shown, a stepper motor rotor includes a third rotor core 6, a fourth rotor core 7, a large inner bore outer magnet 8, and a small inner bore inner magnet 9. The small inner bore inner magnet 9 is embedded in the large inner bore outer magnet 8 and is located between the third rotor core 6 and the fourth rotor core 7. The large inner bore outer magnet 8 and the small inner bore inner magnet 9 are made of different magnetic materials or different grades of rare earth materials.

[0019] The magnetic materials include ferrite, samarium cobalt, neodymium nickel cobalt, and neodymium iron boron. The rare earth materials include samarium cobalt, neodymium nickel cobalt, and neodymium iron boron, wherein the neodymium iron boron includes N35SH and N40M.

[0020] The inner magnet 9 with the small inner hole and the outer magnet 8 with the large inner hole have the same thickness.

[0021] In the above embodiment, the magnet is also located between the third rotor core 6 and the fourth rotor core 7. Unlike the existing solution, the magnet is composed of a large inner hole outer magnet 8 and a small inner hole inner magnet 9. The large inner hole outer magnet 8 and the small inner hole inner magnet 9 can be different magnetic materials such as ferrite, samarium cobalt, neodymium nickel cobalt and neodymium iron boron, etc., and can also be different grades of rare earth materials such as neodymium iron boron N35SH and N40M.

[0022] Example 2 like Figure 9-12As shown, a stepper motor rotor includes a third rotor core, a fourth rotor core, a large inner bore outer magnet 15, and a small inner bore inner magnet 16. The small inner bore inner magnet 16 is embedded in the large inner bore outer magnet 15 and is located between the third rotor core and the fourth rotor core. The large inner bore outer magnet 15 and the small inner bore inner magnet 16 are magnets made of different magnetic materials or different grades of rare earth materials.

[0023] The thickness of the inner magnet 16 with the small inner hole is greater than that of the outer magnet 15 with the large inner hole.

[0024] The third and fourth rotor cores both include large inner hole rotor cores 12 and 13 and small inner hole rotor cores 11 and 14, wherein the small inner hole rotor cores 11 and 14 are assembled on the outside of the large inner hole rotor cores 12 and 13.

[0025] The large inner hole rotor iron chips 12 and 13 are assembled with the small inner hole inner magnet 16.

[0026] In embodiment 2, since the inner magnet 16 with a small inner hole is thicker than the outer magnet 15 with a large inner hole, the rotor design adds large inner hole rotor iron chips 12 and 13 that cooperate with the inner magnet 16 with a small inner hole. The outer side of the large inner hole rotor iron chips 12 and 13 is a regular small inner hole rotor iron chip 11 and 14.

[0027] In this rotor structure, the inner magnet 16 with a small inner hole is preferably made of ferrite, and the outer magnet 15 with a large inner hole is preferably made of neodymium iron boron (NdFeB).

[0028] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A stepper motor rotor, characterized in that, The rotor core includes a third rotor core (6), a fourth rotor core (7), large inner bore outer magnets (8, 15), and small inner bore inner magnets (9, 16). The small inner bore inner magnets (9, 16) are embedded in the large inner bore outer magnets (8, 15) and are located between the third rotor core (6) and the fourth rotor core (7). The large inner bore outer magnets (8, 15) and the small inner bore inner magnets (9, 16) are made of different magnetic materials or different grades of rare earth materials. The thickness of the small inner bore inner magnet (16) is greater than that of the large inner bore outer magnet (15). The small inner bore inner magnet (16) is made of ferrite. The large inner bore outer magnet (15) is made of neodymium iron boron (NdFeB). The third rotor core (6) and the fourth rotor core (7) both include large inner hole rotor iron chips (12, 13) and small inner hole rotor iron chips (11, 14). The small inner hole rotor iron chips (11, 14) are assembled on the outside of the large inner hole rotor iron chips (12, 13). The small inner hole rotor iron chips (11, 14) are coaxially fixedly assembled on one axial side of the large inner hole rotor iron chips (12, 13) and directly attached. The large inner hole rotor iron chips (12, 13) are assembled with the small inner hole inner magnet (16). The inner diameter of the large inner hole rotor iron chips (12, 13) is larger than the inner diameter of the small inner hole rotor iron chips (11, 14), and the two are axially aligned to form a stepped inner hole structure.

2. A stepper motor rotor according to claim 1, characterized in that, The magnetic materials include ferrite, samarium cobalt, neodymium nickel cobalt, and neodymium iron boron.

3. A stepper motor rotor according to claim 1 or 2, characterized in that, The rare earth materials include samarium cobalt, neodymium nickel cobalt, and neodymium iron boron, wherein neodymium iron boron includes N35SH and N40M.

4. A motor having a stepper motor rotor, characterized in that, It includes a stator and a rotor, wherein the rotor is a stepper motor rotor (5, 10) as described in any one of claims 1-3.

Images