TWI686035B - Motor structure capable of effectively changing length of magnetic path - Google Patents

Abstract

A motor structure is provided, which may include a rotation shaft, a rotor and a stator. The rotor may be coupled to the rotation shaft, and may include a plurality of magnets; the included angle between the central axis of each of the magnets and the central axis of the rotation shaft is lower than 90°. The stator may drive the rotor to rotate and stator may include a plurality of stator teeth; the included angle between the axis parallel to the slope surface of the tooth boot of each of the stator teeth and the central axis of the rotation shaft is lower than 90°.

Description

Motor structure capable of effectively changing magnetic circuit length

The invention relates to a motor structure, especially a motor structure which can effectively change the magnetic circuit length.

Generally speaking, if you want to change the output of the motor, you need to install a gearbox in the vehicle (such as cars, locomotives, electric vehicles, ships, helicopters, aircraft and other various vehicles), however, the price of the gearbox is high, And it will take up extra space, so the cost of the vehicle will increase, and the volume will also increase significantly.

Please refer to FIG. 1 for a schematic diagram of the structure of a conventional brushless DC motor. As shown in FIG. 1, the motor 1 may include a stator 11, a rotor 12, a rear end cover 13 and a rotating shaft 14. The stator 11 includes a plurality of stator teeth and a plurality of stator coils 112. The rotor 12 includes a plurality of magnets 121.

However, it is obvious from the above structure that the design of the motor 1 does not have a mechanism to change the output, so if you use the motor 1 carrier (to change its torque, you need to install a gearbox in this carrier, but The price of the gearbox is high, and it will take up extra space, so the cost of the vehicle will increase and the volume will increase significantly.

Therefore, how to propose a motor structure that can effectively improve the situation in which the motor of the conventional technology needs to cooperate with the gearbox to change its output has become an urgent issue.

In view of the above-mentioned problems of the prior art, one of the objects of the present invention is to provide a motor structure to solve the shortcomings of the motor structure of the conventional art, and further improve the output and speed range of the motor structure.

According to one of the objectives of the present invention, a motor structure is proposed, which may include a rotating shaft, a rotor, and a stator. The rotor can be connected to the rotating shaft. The rotor can include a plurality of magnets, and the angle between the central axis of each magnet and the central axis of the rotating shaft is less than 90 degrees. The stator can drive the rotor to rotate. The stator can include a plurality of stator teeth, and the angle between the axis parallel to the slope of the shoe of each stator tooth and the central axis of the rotating shaft is less than 90 degrees.

In a preferred embodiment, the angle between the central axis of each magnet and the central axis of the rotating shaft is the first angle, and the included angle between the axis parallel to the inclined plane of the tooth shoe of each stator tooth and the central axis of the rotating shaft is the second angle , The first angle may be equal to the second angle.

In a preferred embodiment, the rotor may be truncated conical.

In a preferred embodiment, the stator can be controlled by the controller so that the stator can move along the direction of the central axis of the rotating shaft.

In a preferred embodiment, the rotor may be hollow, and the stator may be disposed in the accommodating space inside the rotor.

In a preferred embodiment, the stator may be hollow, and the rotor may be disposed in the accommodating space inside the stator.

In a preferred embodiment, the motor structure may further include a rear end cover, and the stator may be disposed on the rear end cover.

In a preferred embodiment, the rotating shaft may penetrate the center of the rotor, stator and rear end cover.

As mentioned above, the motor structure according to the present invention that can effectively change the length of the magnetic circuit can have one or more of the following advantages:

(1) In one embodiment of the present invention, the stator and the rotor of the motor have a special structure, so when the stator moves along the central axis of the rotating shaft, the length of the magnetic path between the shoe of the stator teeth of the stator and the magnet of the rotor It can be changed to make the motor have a wider adjustment range between efficiency and output. Therefore, the output can be changed without the need for a gearbox, and better performance can be achieved.

(2) In one embodiment of the present invention, the stator and rotor of the motor have a special structure, so the motor has a wider adjustment range between efficiency and output, so it can complete the function of replacing the gearbox and make the motor installed. The volume of the carrier can be reduced.

(3) The motor structure of the present invention is simple in design, so the desired effect can be achieved without significantly increasing the volume and cost.

(4) The motor structure of the present invention can be applied to DC brushless motors, servo motors, and various other types of motors, so it is more widely used

The following will describe an embodiment of a motor structure that can effectively change the length of the magnetic circuit according to the present invention with reference to the related drawings. For clarity and convenience of the description of the drawings, the parts and components in the drawings may be exaggerated in size and proportion In order to facilitate understanding, the same elements in the following embodiments are denoted by the same symbols.

Please refer to FIG. 2 and FIG. 3, which are the first schematic diagram and the second schematic diagram of the first embodiment of the motor structure of the present invention that can effectively change the magnetic circuit length. As shown in FIG. 2, the motor 2 may include a stator 21 (armature), a rotor 22, a rear end cover 23, and a rotating shaft 24.

The stator 21 includes a plurality of stator teeth and a plurality of stator coils 212, and the stator coils 212 can be wound around the stator teeth, respectively.

The rotor 22 may include a plurality of magnets 221, the magnets 221 may be disposed on the inner surface of the rotor 22, the rotor 22 may be hollow, and may be truncated conical, and the stator 21 may be disposed inside the rotor 22 Home space.

The stator 21 may be provided on the rear end cover 23.

The rotating shaft 24 can simultaneously penetrate the rotor 22, the stator 21 and the rear end cover 23.

Among them, the angle between the central axis MC of each magnet 221 of the rotor 22 and the central axis RC of the rotating shaft 24 is the first angle θ1, and the first angle θ1 may be less than 90 degrees; The angle between the axis BC parallel to the inclined plane and the central axis RC of the rotating shaft 24 may be the second angle θ2, and the second angle θ2 may be equal to the first angle θ1.

As shown in FIG. 3, the stator 21 can be controlled by the controller (not shown in the figure) to move the stator 21 along the direction of the rotating shaft 24. Due to the angle between the central axis MC of each magnet 221 and the central axis RC of the rotating shaft 24 The angle between the axis BC which is an acute angle and parallel to the inclined surface of the tooth shoes 211 of each stator tooth and the central axis RC of the rotating shaft 24 is also an acute angle, so when the stator 21 moves along the direction of the rotating shaft 24, the teeth of the stator teeth The distance between the shoe 211 and the magnets 221 changes. When the distance between 211 and 221 is short, the motor efficiency is large. At this time, power saving and high efficiency can be achieved, and the output is large when the distance is long. Therefore, the change of the magnetic circuit length allows the motor 2 to obtain a wider range between efficiency and output. Of course, the above is only an example, and the structure of the motor can be changed according to actual needs, and the invention is not limited thereto.

The magnetic field strength can be expressed by the following formula:

H=NI/l.................................................................. (1)

B=μH..............................................................................(2)

Where H is the magnetic field strength; N is the number of turns; I is the current; l is the magnetic circuit length; B is the magnetic flux density; μ is the magnetic permeability coefficient.

As can be seen from equations (1) and (2), generally speaking, since the number of turns N and the magnetic path length l are both fixed, the output and speed of the motor can only be controlled by changing the magnitude of the current I; The saturation magnetic flux density of the armature silicon steel sheet material is limited, and the current I cannot be increased without limit.

As shown in FIGS. 2 and 3, the special structure of the motor 2 of this embodiment can effectively change the magnetic path length from changing the magnetic path length l, which is the armature silicon steel sheet magnetic path length l2 plus the air gap The length l1, the length l2 of the magnetic circuit of the armature silicon steel sheet is fixed, and the stator 21 of this embodiment can be controlled by the controller to move the stator 21 along the direction of the rotating shaft 24, because the central axis MC of each magnet 221 and the center of the rotating shaft 24 The included angle of the shaft RC is an acute angle and the included angle between the axis BC parallel to the inclined surface of the stator shoe 211 of each stator tooth and the central axis RC of the rotating shaft 24 is also an acute angle, so when the stator 21 moves along the direction of the rotating shaft 24, these The distance between the stator shoe 211 of the stator teeth and the magnets 221, that is, the air gap length l1 can be changed, that is, the magnetic circuit length l can be changed, and when the magnetic circuit length l is changed, the magnetic permeability coefficient μ will decrease, so it will not The silicon steel sheet achieves magnetic saturation, so the current can be increased to obtain a greater magnetic field strength H. The greater the magnetic field strength H, the greater the motor output. Therefore, the motor 2 can achieve a wider range between efficiency and output.

As can be seen from the above, both the stator and the rotor of the motor 2 have a special structural design. When the magnetic circuit length l increases, the motor efficiency is large. At this time, power saving and high efficiency can be achieved, and when the magnetic circuit length l decreases, the motor 2 High output can be achieved, so this structural design allows the motor 2 to obtain a wider range between efficiency and output, so it can indeed complete the effect and function of replacing the gearbox, and can indeed improve the shortcomings of the conventional technology, so it can be applied to DC Brushless motors, servo motors and various other types of motors are widely used.

It is worth mentioning that the motor structure of the conventional technology requires a gearbox to change its output due to structural limitations, and the air gap distance of the motor structure of the conventional technology is fixed, which is required for different application loads. The compromise design between output and efficiency has a small range of output and speed. On the contrary, in one embodiment of the present invention, the stator and the rotor of the motor have a special structure, so when the stator moves along the central axis of the rotating shaft, the magnetic path length between the stator shoe of the stator teeth and the magnet of the rotor It can be changed to make the motor have a wider adjustment range between efficiency and output, so it can change its output without the need for a gearbox, and can achieve better performance.

In addition, in one embodiment of the present invention, the stator and rotor of the motor have a special structure, so that the motor has a wider adjustment range between efficiency and output, so it can complete the function of replacing the gearbox, so that the load of the motor is installed. The volume of vehicles (such as automobiles, locomotives, electric vehicles, ships, helicopters, airplanes and other various vehicles) can be reduced.

In addition, the motor structure of the present invention is simple in design, so the desired effect can be achieved without significantly increasing the volume and cost.

Furthermore, the motor structure of the present invention can be applied to DC brushless motors, servo motors, and various other types of motors, so it is more widely used. As can be seen from the above, the present invention has progressive patent requirements.

In summary, in one embodiment of the present invention, the stator and the rotor of the motor have a special structure, so when the stator moves along the central axis of the rotating shaft, the magnetic between the shoe of the stator teeth of the stator and the magnet of the rotor The length of the road can be changed, so that the motor has a wider adjustment range between efficiency and output, so it can change its output without the need for a gearbox, and can achieve better performance.

In addition, in one embodiment of the present invention, the stator and rotor of the motor have a special structure, so that the motor has a wider adjustment range between efficiency and output, so it can complete the function of replacing the gearbox, so that the load The volume of the tool can be reduced.

In addition, the motor structure of the present invention is simple in design, so the desired effect can be achieved without significantly increasing the volume and cost.

Furthermore, the motor structure of the present invention can be applied to DC brushless motors, servo motors, and various other types of motors, so it is more widely used.

It can be seen that the present invention has achieved the desired enhancement effect by breaking through the previous technology, and it is not easy to think about by those who are familiar with the art. Its progress and practicality have obviously met the patent application requirements. I filed a patent application in accordance with the law, and urge your office to approve this application for a patent for invention, in order to encourage creativity and to feel virtuous.

The above is only exemplary, and not restrictive. Any other equivalent modifications or changes made without departing from the spirit and scope of the present invention should be included in the scope of the attached patent application.

1‧‧‧Motor 11 of the conventional technique 11‧‧‧ Stator 111‧‧‧Tooth shoe 112‧‧‧ Stator coil 12‧‧‧Rotor 121‧‧‧Magnet 13‧‧‧Rear cover 14‧‧‧Rotating shaft 2‧ ‧‧Motor 21‧‧‧ Stator 211‧‧‧Tooth boots 212‧‧‧ Stator coil 22‧‧‧Rotor 221‧‧‧Magnet 23‧‧‧Rear cover 24‧‧‧Rotating axis MC‧‧‧ Central axis of magnet RC‧‧‧The central axis of the rotating shaft BC‧‧‧The axis parallel to the inclined surface of the stator shoe of the tooth θ1‧‧‧First angle θ2‧‧‧Second angle l1‧‧‧Air gap length

Figure 1 is a schematic diagram of the structure of a conventional brushless DC motor.

FIG. 2 is a first schematic diagram of the first embodiment of the motor structure of the present invention that can effectively change the magnetic circuit length.

FIG. 3 is a second schematic diagram of the first embodiment of the motor structure of the present invention that can effectively change the magnetic circuit length.

2‧‧‧Motor

21‧‧‧ Stator

211‧‧‧tooth boots

212‧‧‧ Stator coil

22‧‧‧Rotor

221‧‧‧Magnet

23‧‧‧ Rear cover

24‧‧‧spindle

MC‧‧‧Central axis of magnet

RC‧‧‧Central axis of the rotating shaft

BC‧‧‧Axis parallel to the slope of the stator shoe

θ1‧‧‧First angle

θ2‧‧‧Second Angle

l 1‧‧‧ Air gap length

Claims (8)

A motor structure capable of effectively changing the magnetic circuit length includes: a rotating shaft; a rotor connected with the rotating shaft, the rotor includes a plurality of magnets, and the angle between the central axis of each magnet and the central axis of the rotating shaft is less than 90 degrees ; And stator, which drives the rotor to rotate, the stator contains a plurality of stator teeth, and the angle between an axis parallel to a slope of a tooth shoe of each of the stator teeth and the central axis of the rotating shaft is less than 90 degrees; wherein, When the stator moves along the direction of the rotating shaft, the length of an air gap between the teeth shoes of the stator teeth and the magnets is changed, and the length of a magnetic circuit is changed, and the length of the magnetic circuit is the length of the stator The length of the magnetic circuit of an armature silicon steel sheet plus the length of the air gap thereby changes the permeability of the magnet to change the output of the motor structure. The motor structure capable of effectively changing the magnetic circuit length as described in item 1 of the scope of the patent application, wherein the angle between the central axis of each magnet and the central axis of the rotating shaft is a first angle, and the tooth with each of the stator teeth The angle between the axis parallel to the slope of the shoe and the central axis of the rotating shaft is a second angle, and the first angle is equal to the second angle. The motor structure that can effectively change the length of the magnetic circuit as described in item 1 of the patent application scope, wherein the rotor is truncated conical. The motor structure capable of effectively changing the magnetic circuit length as described in item 1 of the patent application scope, wherein the stator is controlled by a controller to move the stator along the direction of the central axis of the rotating shaft. As described in item 1 of the patent application scope, a motor structure capable of effectively changing the length of a magnetic circuit, wherein the rotor is hollow, and the stator is provided in a receiving space inside the rotor. The motor structure capable of effectively changing the magnetic circuit length as described in item 1 of the patent application scope, wherein the stator is hollow, and the rotor is provided in the accommodating space inside the stator. The motor structure that can effectively change the magnetic circuit length as described in item 1 of the scope of the patent application further includes a rear end cover, and the stator is disposed on the rear end cover. The motor structure capable of effectively changing the length of the magnetic circuit as described in item 1 of the scope of the patent application, wherein the rotating shaft passes through the center of the rotor, the stator and the rear end cover.

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