CN116094219A

CN116094219A - Variable speed torque-changing motor

Info

Publication number: CN116094219A
Application number: CN202111351051.5A
Authority: CN
Inventors: 贾建伟; 贾朝翔; 于占君
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-07
Filing date: 2021-11-07
Publication date: 2023-05-09

Abstract

The invention discloses a variable speed and torque conversion motor, wherein a stator core is fixed on a stator shaft, a first bearing and a second bearing are respectively assembled on bearing positions at two ends of the stator shaft, a stator winding is wound in a wire slot of the stator core, and an outer rotor winding is wound in a wire slot of the outer rotor core. The beneficial effects of the invention are as follows: the motor control mode is changed from the original power frequency power supply direct driving mode, the frequency converter active driving mode or the power frequency voltage regulation active driving mode into a control mode of combining variable frequency voltage regulation active control and induction winding current limiting control, so that the motor with small volume and stepless speed change and torque conversion is realized.

Description

Variable speed torque-changing motor

Technical Field

The invention relates to the field of motors, in particular to a variable speed and torque conversion motor.

Background

The existing driving motors comprise induction asynchronous motors, permanent magnet synchronous motors and the like. The specific cases are as follows:

when the induction motor is directly driven by using an industrial frequency power supply, the rated rotation speed and torque are output and determined by the pole number of a motor stator, but the induction motor has large current impact during starting, which is unfavorable to a power grid, but the starting torque is larger; the induction motor is driven by a frequency converter, the output torque and the rotation speed are determined by the frequency converter, the impact current is smaller during starting, but the relative current is larger during low speed; when the induction motor is driven by the voltage regulating driver, the starting torque is smaller, and the induction motor is not suitable for heavy-load starting driving.

When the permanent magnet synchronous motor is driven by the frequency converter, the impact current is not large, the rated output rotating speed torque of the motor is determined by the frequency input by the frequency converter and the pole number of the motor stator, and in order to ensure the safety of the frequency converter and the motor, the constant torque output is generally adopted in control. When the motor is designed to run at a low speed, the volume of the product is relatively large, and the amount of the consumed permanent magnet is also large. Permanent magnet synchronous motors can also be driven using brush control. The motor controlled by the motor has good speed regulation performance, relatively large torque at low speed, and the disadvantage is that the brush is easy to wear; the permanent magnet synchronous motor can also be driven by a brushless control mode, so that the defects of the brush motor are avoided, and the performance of the permanent magnet synchronous motor is equivalent to that of the brush motor.

Disclosure of Invention

The invention aims to solve the problems and provides a variable speed torque-converting motor.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the utility model provides a variable speed torque motor, includes outer rotor cover, outer rotor winding, outer rotor core, first bearing, stator shaft, second bearing, stator core, stator winding, outer rotor end cover, stator core fixes on the stator shaft, first bearing with the second bearing is assembled respectively on the both ends bearing position of stator shaft, stator winding winds in stator core's wire casing, outer rotor winding winds in outer rotor core's wire casing, its characterized in that, outer rotor core is fixed in outer rotor cover, outer rotor cover regards first bearing as the locate position with the stator shaft is assembled together, outer rotor end cover regards second bearing as the locate position with outer rotor cover is assembled together, the current limiting controller with outer rotor winding switch on and fix in outer rotor cover left side.

Preferably, the number of poles of the stator winding is a multiple of 3 with the number of poles of the outer rotor winding.

Preferably, at least one of the number of poles of the stator winding and the number of poles of the outer rotor winding is an even number.

The beneficial effects of the invention are as follows:

the motor control mode is changed from the original power frequency power supply direct driving mode, the frequency converter active driving mode or the power frequency voltage regulation active driving mode into a control mode of combining variable frequency voltage regulation active control and induction winding current limiting control, so that the motor with small volume and stepless speed change and torque conversion is realized.

Drawings

FIG. 1 is a schematic view of the whole of the present invention.

Fig. 2 is an exploded view of the present invention.

In the figure: the stator comprises an outer rotor sleeve 1, an outer rotor winding 2, an outer rotor iron core 3, a first bearing 4, a stator shaft 5, a second bearing 6, a stator iron core 7, a stator winding 8, an outer rotor end cover 9 and a current limiting control machine 10.

Detailed Description

The following examples will enable those skilled in the art to more fully understand the present invention and are not intended to limit the same in any way.

The terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible in this specification are defined with respect to the configurations shown in the drawings, and the terms "inner" and "outer" refer to the relative concepts of the terms toward or away from the geometric center of a particular component, respectively, and thus may be changed accordingly depending on the location and use state of the component. These and other directional terms should not be construed as limiting terms.

The technical scheme and effects of the present invention are further described below by means of specific embodiments. The following embodiments are merely illustrative of the present invention, and the present invention is not limited to the following embodiments or examples. Simple modifications of the invention using the inventive concept are within the scope of the invention as claimed.

Example 1:

as shown in fig. 1-2, the variable speed torque-converting motor comprises an outer rotor sleeve 1, an outer rotor winding 2, an outer rotor iron core 3, a first bearing 4, a stator shaft 5, a second bearing 6, a stator iron core 7, a stator winding 8 and an outer rotor end cover 9, wherein the stator iron core 7 is fixed on the stator shaft 5, the first bearing 4 and the second bearing 6 are respectively assembled on bearing positions at two ends of the stator shaft 5, the stator winding 8 is wound in a wire groove of the stator iron core 7, and the outer rotor winding 2 is wound in a wire groove of the outer rotor iron core 3.

In this embodiment, the number of poles of the stator winding 8 is 24 and the number of poles of the outer rotor winding 2 is 21.

Example 2:

In this embodiment, the number of poles of the stator winding 8 is 36, and the number of poles of the outer rotor winding 2 is 27.

Example 3:

In this embodiment, the number of poles of the stator winding 8 is 36, and the number of poles of the outer rotor winding 2 is 24.

The working principle of the invention is as follows:

when the motor is used, a frequency converter with adjustable output voltage is used as the driving of the motor, the output of the frequency converter is connected to the stator winding 8, when a driver power supply is output to the stator winding 8 at a certain frequency, a rotating electromagnetic field is formed in the stator winding 8, induced current is generated in the outer rotor winding 2, an induced magnetic field is formed on the outer rotor assembly, when the driver gradually increases the input voltage, the induced magnetic field on the outer rotor assembly is also gradually increased, the load moment on the outer rotor assembly is overcome, and the motor starts to rotate. When the load moment is reduced, the speed of the outer rotor is increased, the rotation speed difference between the rotor and the stator is reduced, and when the load moment is increased, the speed of the outer rotor is reduced. Because the current limiting control is carried out in the outer rotor winding, the current in the outer rotor winding is not allowed to be larger than a certain value, when the load moment born by the outer rotor assembly is continuously increased, the outer rotor assembly can only continuously reduce the speed to increase the moment so as to adapt to the load moment, if the rotating speed and the torque of the outer rotor are required to be continuously increased, the input voltage can be increased, and thus, the motor with self-adaptive output of the rotating speed and the torque is realized.

The current-limiting controller 10 is a voltage-regulating circuit, is embedded into an induction circuit, is a circuit designed according to actual use, continuously monitors current in the circuit in operation, and then modulates voltage in a closed loop to realize the controllable current.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides a variable speed torque motor, includes outer rotor cover (1), outer rotor winding (2), outer rotor core (3), first bearing (4), stator shaft (5), second bearing (6), stator core (7), stator winding (8), outer rotor end cover (9), stator core (7) are fixed on stator shaft (5), first bearing (4) and second bearing (6) are assembled respectively on the both ends bearing position of stator shaft 5, stator winding (8) are wound in the wire casing of stator core (7), outer rotor winding (2) are wound in the wire casing of outer rotor core (3), characterized in that, outer rotor core (3) are fixed in outer rotor cover (1), outer rotor cover (1) regard first bearing (4) as the locate position with stator shaft (5) are assembled together, outer rotor end cover (9) regard second bearing (6) as the locate position with outer rotor cover (1) is assembled together, current-limiting controller (10) are in outer rotor winding (2) and are fixed in outer rotor winding (1) side switch on.

2. A variable speed and torque motor according to claim 1, characterized in that the number of poles of the stator winding (8) is 12 and the number of poles of the outer rotor winding (2) is a multiple of 3.

3. A variable speed and torque motor according to claim 2, characterized in that at least one of the number of poles of the stator winding (8) and the number of poles of the outer rotor winding (2) is even.