Treadmill motor

Abstract

The utility model discloses a treadmill motor, which comprises a casing, a stator assembly, a rotor assembly and a commutator, the rotor assembly is positioned on the inner side of the stator assembly, the rotor assembly comprises a rotor iron core, the outer diameter of the rotor iron core is 46-50mm, the rotor iron core comprises a rotor punching sheet body, and the commutator is arranged on the rotor punching sheet body. 12 rotor slots are uniformly formed in the rotor punching sheet body along the circumferential direction, and the outer end of each rotor slot is of an opening structure; the commutator is fixedly arranged on the rotating shaft, the outer diameter of the commutator is 28-29 mm, and 24 hooks are evenly arranged on the commutator in the circumferential direction. The rotor enameled wire wound between the rotor iron core and the commutator is a thick wire with an outer diameter of 0.6-1.0 mm. Under the conditions that the motor power is not reduced and the temperature rise of the motor is not changed, the outer diameter of the electronic rotor iron core can be reduced, so that the size of an outer cover of the whole treadmill can be reduced, the logistics cost can be reduced, and the material cost of the rotor iron core and the cost of the whole treadmill can also be reduced.

Description

Technical Field

[0001] The utility model belongs to the field of fitness equipment production, and particularly relates to a treadmill motor. Background Art

[0002] Treadmills are essential equipment for families and gyms, and are the simplest type of home fitness equipment today, making them the best choice for home fitness machines. The treadmill motor (hereinafter referred to as the motor) is the power source of the treadmill, and usually includes a motor housing, end covers provided at both ends of the motor housing, a stator, a rotor, and a commutator provided inside the motor housing. In existing treadmill motors with an inner rotor and an outer stator, due to power requirements, the minimum outer diameter of the rotor core cannot be too small, so the minimum outer diameter of the outermost motor housing can only be made to 82 mm. When the outer diameter of the outermost motor housing is the minimum of 82 mm, usually its rotor core 7' and the commutator 4' cooperating with it are as shown in the appendix Figure 1 As shown, 16 rotor slots 8' are provided on the rotor core 7', 32 hooks 9' are provided on the commutator 4', the outer diameter φ of the rotor core 7' is usually at least about 53.2 mm, the outer diameter φ of the commutator 4' is about 32 mm, and the rotor enameled wire wound between the rotor core 7' and the commutator 4' can only be a thin wire with an outer diameter φ between 0.41 - 0.55 mm. Because if the rotor core is made too small, it will lead to insufficient winding of the rotor enameled wire, resulting in insufficient current-carrying capacity of the motor and inability to meet the power requirements of the motor. If the outer diameter of the rotor core is large, it will inevitably lead to a large outer cover of the entire treadmill, and also increase the cost of loading the entire machine into a container for export, thus increasing the logistics cost. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a treadmill motor that can achieve a smaller outer diameter of the rotor core of the motor without reducing the power and motor temperature rise.

[0004] The utility model is realized through the following technical solutions:

[0005] A treadmill motor includes a housing, a front end cover and a rear end cover provided at both ends of the housing, a stator assembly, a rotor assembly, and a commutator provided inside the housing. The stator assembly includes magnetic tiles fixedly connected to the housing. The rotor assembly is located inside the stator assembly. The rotor assembly includes a rotating shaft mounted between the two end covers through bearings and a rotor core fixedly provided on the rotating shaft. The outer diameter of the rotor core is 46 - 50 mm. The rotor core includes a rotor punching body. Along the circumferential direction, 12 rotor slots are evenly opened on the rotor punching body. The outer ends of each rotor slot are of an open structure. The commutator is fixedly provided on the rotating shaft. The outer diameter of the commutator is 28 - 29 mm. Along the circumferential direction, 24 hooks are evenly provided on the commutator. The rotor enameled wire wound between the rotor core and the commutator is a thick wire with an outer diameter of 0.6 - 1.0 mm.

[0006] The reason for coming up with this solution is that the inventor found that in the treadmill motors in the prior art, when the outer diameter of the housing is 82 mm, the number of rotor slots is 16, and the number of hooks on the commutator is 32. In this case, the single slot area of the rotor slots of the rotor core is small, and the distance between the hooks of the commutator is narrow. When directly using a thick wire for the rotor enameled wire and spot welding the wire end of the rotor enameled wire to the hook of the commutator, it is easy for the hooks to touch each other, resulting in rotor short - circuit. Therefore, the enameled wire on the rotor core with an 82 - mm outer diameter housing can only use a thin wire and cannot use a thick wire. So, when trying to keep the power unchanged, the outer diameter of the rotor core cannot be further reduced by changing the rotor enameled wire to a thick wire, otherwise, the current - carrying capacity of the motor will not be enough. By using a larger single slot area of the rotor slot and a wider distance between the hooks of the commutator, it becomes possible to use a thick - wire rotor enameled wire. Since the thick - wire rotor enameled wire has a lower resistance compared to the thin wire, to obtain the same power, it only needs the overall thickness of the rotor enameled wire wound on the rotor core to be thinner. Thus, the outer diameter of the rotor core can be relatively reduced. Therefore, it is possible to reduce the outer diameter of the rotor core under the condition of unchanged power and unchanged motor temperature rise.

[0007] Preferably, the outer diameter of the commutator is 28.15 mm.

[0008] Preferably, the distance between adjacent hooks of the commutator is 2.4 mm.

[0009] Preferably, the outer diameter of the rotor core is 48 mm.

[0010] Preferably, the rotor enameled wire wound between the rotor core and the commutator is a thick wire with an outer diameter of 0.8 mm.

[0011] Preferably, the outer diameter of the housing is 73 mm.

[0012] Preferably, both ends of the rotating shaft pass through the front end cover and the rear end cover and extend outwards. A set of external wind blades are fixedly arranged on the rotating shaft outside the rear end cover. When the rotating shaft rotates, the direction of the wind driven by the external wind blades blows towards the rotor core, so as to reduce the temperature rise of the motor and ensure that the motor can be continuously used for a long time.

[0013] The beneficial effects of the present utility model are as follows:

[0014] The treadmill motor of the present utility model has a clever structure. By changing the number of rotor slots on the rotor core from 16 in the rotor core with an outer diameter of 82 mm of the original housing to 12, and changing the number of hooks on the commutator of the original motor with a rotor core having an outer diameter of 82 mm of the housing from 32 to 24, thick rotor enameled wires can be used on the new motor. Because under the conditions of the single-slot area of the rotor slot and the width between the hooks of the commutator, even when thick rotor enameled wires are used, it is not easy to cause the situation that the hooks of the commutator touch each other during spot welding and cause rotor short circuit. And because the thick wire wound into the same thickness has a lower resistance than the thin wire, if the same power is to be obtained, the overall thickness of the thick rotor enameled wire wound on the rotor core can be thinner to achieve the goal. Therefore, the outer diameter of the rotor core can be relatively reduced. As a result, without reducing the motor power and keeping the motor temperature rise unchanged, the outer diameter of the electronic rotor core can be made smaller, and then the minimum outer diameter of the housing can reach 73 mm. This can not only reduce the size of the whole treadmill housing, reduce the container cost when exporting the whole machine, reduce the logistics cost, but also save the material cost of manufacturing the rotor core and reduce the manufacturing cost of the whole machine. It has strong practicability and is worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present utility model will be described by way of examples with reference to the accompanying drawings, where:

[0016] Figure 1 It is a schematic structural diagram of the rotor core and the commutator when the outer diameter of the housing of the treadmill motor described in the background art is the smallest, which is 82 mm;

[0017] Figure 2 It is a schematic overall structural diagram of the treadmill motor according to an embodiment of the present utility model;

[0018] Figure 3 It is a schematic cross-sectional structural diagram of the treadmill motor according to an embodiment of the present utility model;

[0019] Figure 4 It is a schematic structural diagram of the rotor core in an embodiment of the present utility model;

[0020] Figure 5 It is a schematic front view structural diagram of the commutator in an embodiment of the present utility model;

[0021] Figure 6 This is a schematic side view structure diagram of the commutator in the embodiment of the present invention. Detailed implementation manners

[0022] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0023] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0024] As Figure 2-6 shown, a treadmill motor includes a housing 1, a front end cover 2 and a rear end cover 3 provided at both ends of the housing 1, a stator assembly, a rotor assembly, and a commutator 4 provided inside the housing 1. The stator assembly includes a magnetic tile 5 fixedly connected to the housing 1. The rotor assembly is located inside the stator assembly. The rotor assembly includes a rotating shaft 6 mounted between the two end covers through bearings and a rotor core 7 fixedly provided on the rotating shaft 6. The outer diameter of the rotor core 7 is 46 - 50 mm. The rotor core 7 includes a rotor punching body. Along the circumferential direction, 12 rotor slots 8 are evenly opened on the rotor punching body. The outer ends of the rotor slots 8 are all open structures. The commutator 4 is fixedly provided on the rotating shaft 6. The outer diameter of the commutator 4 is 28 - 29 mm. 24 hooks 9 are evenly provided on the commutator 4 along the circumferential direction. The rotor enameled wire wound between the rotor core 7 and the commutator 4 is a thick wire with an outer diameter of 0.6 - 1.0 mm.

[0025] In this embodiment, the outer diameter of the commutator 4 is 28.15 mm.

[0026] In this embodiment, the distance between adjacent hooks 9 of the commutator 4 is 2.4 mm.

[0027] In this embodiment, the outer diameter of the rotor core 7 is 48 mm.

[0028] In this embodiment, the rotor enameled wire 12 wound between the rotor core 7 and the commutator 4 is a thick wire with an outer diameter of 0.8 mm.

[0029] In this embodiment, the outer diameter of the housing 1 is 73 mm.

[0030] In this embodiment, both ends of the rotating shaft 6 pass through the front end cover 2 and the rear end cover 3 and extend outwards. A set of external wind blades 11 are fixedly arranged on the rotating shaft 6 outside the rear end cover 3. When the rotating shaft 6 rotates, the direction of the wind driven by the external wind blades 11 blows towards the rotor core 7, so as to reduce the temperature rise of the motor and ensure that the motor can be continuously used for a long time.

[0031] In this embodiment, both ends of the rotating shaft pass through the front end cover and the rear end cover and extend outwards. A set of rear wind blades are fixedly arranged on the rotating shaft outside the rear end cover. When the rotating shaft rotates, the direction of the wind driven by the rear wind blades blows towards the rotor core, so as to reduce the temperature rise of the motor and ensure that the motor can be continuously used for a long time.

[0032] In the present utility model, by setting the number of rotor slots on the rotor core from 16 on the rotor core under the casing with an original outer diameter of 82 mm to 12, and setting the number of hooks on the commutator of the original motor with the rotor core under the casing having an outer diameter of 82 mm from 32 to 24, it enables the use of thick rotor enameled wire on the new motor. Because under the conditions of the single-slot area of the rotor slot and the width between the hooks of the commutator, even when using thick rotor enameled wire, it is not easy to cause the situation that the hooks of the commutator touch each other during spot welding and cause rotor short circuit. And because the thick wire wound into the same thickness has a lower resistance compared to the thin wire, if the same power is to be obtained, the overall thickness of the thick rotor enameled wire wound on the rotor core can be thinner to achieve it. Therefore, the outer diameter of the rotor core can be relatively reduced, and thus it can be made that without reducing the motor power and with the motor temperature rise unchanged, the outer diameter of the electronic rotor core can be made smaller, and further the minimum outer diameter of the casing can reach 72 mm.

[0033] The treadmill motor of the present utility model has a clever structure. Without reducing the motor power and with the motor temperature rise unchanged, it can make the outer diameter of the electronic rotor core smaller. It can not only reduce the size of the whole treadmill outer cover, reduce the container cost when exporting the whole machine, reduce the logistics cost, but also save the material cost of manufacturing the rotor core and reduce the manufacturing cost of the whole machine. It has strong practicability and is worthy of promotion.

[0034] The present utility model is not limited to the foregoing specific embodiments. The present utility model extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A treadmill motor, comprising a housing, a front cover and a rear cover arranged at both ends of the housing, a stator assembly arranged in the housing, a rotor assembly, and a commutator, wherein the stator assembly comprises a magnetic tile fixedly connected to the housing, the rotor assembly is located inside the stator assembly, and the rotor assembly comprises a rotating shaft mounted between two end covers through a bearing and a rotor core fixedly arranged on the rotating shaft, characterized in that: The outer diameter of the rotor core is 46-50mm, and the rotor core includes a rotor punching body, on which 12 rotor slots are evenly arranged along the circumferential direction, and the outer ends of each rotor slot are open structures; the commutator is fixedly arranged on the rotating shaft, and the outer diameter of the commutator is 28-29mm, and 24 hooks are evenly arranged on the commutator along the circumferential direction; the rotor enameled wire wound between the rotor core and the commutator is a thick wire with an outer diameter of 0.6-1.0mm.

2. The treadmill motor according to claim 1, characterized in that: The outer diameter of the commutator is 28.15 mm.

3. The treadmill motor according to claim 1, characterized in that: The spacing between adjacent hooks of the commutator is 2.4 mm.

4. The treadmill motor according to claim 1, characterized in that: The outer diameter of the rotor core is 48 mm.

5. The treadmill motor according to claim 1, characterized in that: The rotor enameled wire wound between the rotor core and the commutator is a thick wire with an outer diameter of 0.8 mm.

6. The treadmill motor according to claim 1, characterized in that: The outer diameter of the housing is 73 mm.

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