CN219433994U

CN219433994U - Resolver and motor system

Info

Publication number: CN219433994U
Application number: CN202223475417.2U
Authority: CN
Inventors: 高宏伟; 高翔; 包华宇
Original assignee: Suzhou Yuze Intelligent Technology Co ltd
Current assignee: Suzhou Yuze Intelligent Technology Co ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-07-28
Anticipated expiration: 2032-12-26

Abstract

The present utility model provides a rotary transformer, comprising: exciting winding; a sinusoidal detection module including a first sinusoidal output, a second sinusoidal output, and a sinusoidal winding that generates a sinusoidal detection signal according to rotation of the rotor, wherein the sinusoidal detection module further includes a first capacitor and a second capacitor to reduce a phase of the sinusoidal detection signal from being affected by the sinusoidal winding, and the first capacitor is electrically connected between a first end of the sinusoidal winding and the load, and the second capacitor is electrically connected between a second end of the sinusoidal winding and the load; and the cosine detection module comprises a first cosine output end, a second cosine output end and a cosine winding, wherein the cosine winding generates a cosine detection signal according to the rotation of the rotor, and the sine detection signal and the cosine detection signal are mutually orthogonal. Compared with the prior art, the rotary transformer structure is easy to realize and has excellent performance.

Description

Resolver and motor system

Technical Field

The utility model belongs to the technical field of detection, and relates to a rotary transformer and a motor system

Background

Rotating electrical machines are widely used in various industries such as new energy and automatic control, and when they are used, sensors for the rotation angle of the electrical machine are required. The rotary transformer is a sensor capable of realizing rotation angle detection, and the existing reluctance rotary transformer comprises a winding structure, so that a certain hysteresis is generated on the signal phase of a load resistor, and the response speed of a system is further reduced.

Disclosure of Invention

The utility model aims to provide a rotary transformer which is easy to realize and has obvious effect and a corresponding motor system for improving the response speed of the system.

In one aspect, the present utility model provides a rotary transformer comprising: a sinusoidal detection module including a first sinusoidal output, a second sinusoidal output, and a sinusoidal winding that generates a sinusoidal detection signal according to rotation of a rotor, wherein the sinusoidal detection module further includes a first capacitor and a second capacitor to reduce a phase of the sinusoidal detection signal from being affected by the sinusoidal winding, and the first capacitor is electrically connected between a first end of the sinusoidal winding and a load, and the second capacitor is electrically connected between a second end of the sinusoidal winding and the load; the cosine detection module comprises a first cosine output end, a second cosine output end and a cosine winding, wherein the cosine winding generates a cosine detection signal according to the rotation of the rotor, and the sine winding and the cosine winding are mutually orthogonal.

In one embodiment, the capacitance value of the first capacitor and the capacitance value of the second capacitor match the inductance value of the sinusoidal winding.

In one embodiment, the capacitance value of the first capacitor is equal to the capacitance value of the second capacitor.

In one embodiment, the cosine detection module further includes a third capacitor and a fourth capacitor to reduce the phase of the cosine detection signal from being affected by the cosine winding, and the third capacitor is electrically connected between a first end of the cosine winding and a load, and the second capacitor is electrically connected between a second end of the cosine winding and the load.

In one embodiment, the capacitance value of the third capacitor and the capacitance value of the fourth capacitor match the inductance value of the cosine winding.

In one embodiment, the cosine detection module further includes a fifth capacitor to reduce the phase of the cosine detection signal from being affected by the cosine winding, wherein the fifth capacitor is electrically connected between the cosine winding and a load, and a value of the fifth capacitor matches an inductance value of the cosine winding.

In one embodiment, the capacitance value of the third capacitor is equal to the capacitance value of the fourth capacitor.

Another aspect of the present utility model provides a motor system, comprising a motor, and further comprising a rotary transformer as described above, electrically linked to the motor, for detecting an operating state of the motor, and generating a state indication signal; a power supply electrically connected to the rotary transformer for providing a power signal to the rotary transformer; and a state processing device electrically connected to the rotary transformer to receive the state indication signal and further determine the working state of the motor.

Compared with the prior art, the rotary transformer has the advantages of greatly improving the output response speed and applicability, along with simple structure and lower cost.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present utility model, the following drawings are provided for cooperation:

FIG. 1 is a schematic diagram of a resolver according to an embodiment of the present utility model;

FIG. 2 is an equivalent circuit diagram of a resolver output circuit;

FIG. 3 is a schematic diagram of a resolver according to another embodiment of the present utility model;

FIG. 4 is a schematic diagram of a resolver according to another embodiment of the present utility model;

fig. 5 is a schematic diagram of an electric motor system according to an embodiment of the utility model.

It should be noted that the above-mentioned figures illustrate only some embodiments of the utility model and that those skilled in the art will be able to obtain figures of other embodiments from these figures without inventive faculty.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings and examples. It should be understood that: the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Spatially relative terms, such as "under," "below," "lower," "over," "upper" and the like, may be used for convenience of description to describe one element or feature as illustrated in the figures relative to another element or feature as desired. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features.

Unless otherwise defined, terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present utility model pertains, and should be understood to have a meaning consistent with the meaning of the related art, except insofar as the present utility model is explicitly defined.

The utility model provides a rotary transformer, wherein an input end and an output end of the rotary transformer are not electrically connected, and the rotation angle is measured by induction voltage.

Fig. 1 is a schematic diagram of a resolver according to an embodiment of the present utility model.

As shown in fig. 1, a resolver (hereinafter referred to as "resolver") 10 includes power interfaces 11 and 12, a rotor Z, a stator core (not shown), a first detection unit 101, and a second detection unit 102.

Specifically, the power interfaces 11 and 12 are electrically connected to the power source 20 for acquiring a power source signal and supplying power to the rotor Z through the exciting winding LP. The sinusoidal detection module 101 comprises sinusoidal output ports 1011 and 1012 for outputting a sinusoidal detection signal generated by a sinusoidal signal winding LS, wherein capacitors 1013, 1014 are electrically connected to the sinusoidal detection module 101 for reducing the phase of the sinusoidal detection signal being affected by the sinusoidal winding LS. Similarly, cosine detection module 102 includes output interfaces 1021 and 1022 for outputting a cosine detection signal generated by cosine signal winding LC, wherein capacitors 1023, 1024 are electrically connected to cosine detection module 102 for reducing the phase of the cosine detection signal from being affected by cosine winding LC. It will be appreciated that the capacitor 1013/1023 may be included within the spiral 10 or may be located outside the spiral 10 as a separate component. In other words, the housing (not shown) of the spiral 10 may contain the capacitor 1013/1023 within the spiral 10 or may be located outside the spiral 10 as a separate component. The sine winding LS and the cosine winding LC are orthogonal to each other, and wherein the excitation winding LP, the sine winding LS, and the cosine winding LC are wound on the stator core.

With the above configuration, the sine detection module 101 and the cosine detection module 102 of the resolver 10 can respectively provide signal outputs of corresponding periods.

For ease of understanding, the description will be given first without a capacitor.

In terms of interface characteristics, the output circuit of the rotary transformer can be equivalently a series circuit of a voltage source, a resistor and an inductor, and as shown in fig. 2, this current can be expressed as:

the voltage across the load resistor R2 can be expressed as:

thus, the phase of the voltage across the load lags the power supply signal U to be detected, resulting in a slower system response.

When the capacitors C1 and C2 are provided, the voltage across the load resistor R2 can be expressed as

As can be seen from the above equation, when equation (4) is established:

at this time, w ² L= (c1+c2/1×c2, u2=i×r2/(r1+r2). Therefore, the voltage is not retarded, and the response speed is improved.

Referring to fig. 1 again, when the capacitor 1013/1023 is combined with the condition of formula (4), the voltage signal on the load is not phase-shifted from the sine detection signal and the cosine detection signal, thereby improving the response speed of the system.

For the rotation variation in fig. 1, since both the sine detection module and the cosine detection module have a capacitor that is compliant, the voltage signal obtained at the output is free of phase lag.

It will be appreciated by those skilled in the art that the capacitance of the capacitor may be other values for specific needs, such that the voltage signal at the output is provided with a specified phase lag.

Fig. 3 is a schematic diagram of a resolver according to another embodiment of the present utility model.

In contrast to the spiral in fig. 1, only the sinusoidal detection module in the spiral 10 in fig. 3 comprises capacitors 1013 and 1014. Thus, in the present embodiment, the phase delay of the voltage signal at the sine output of the resolver 10 is eliminated or reduced, while the voltage signal at the cosine output is not adjusted.

Fig. 4 is a schematic diagram of a resolver according to another embodiment of the present utility model.

In contrast to the spiral in fig. 1, the sine detection module in the spiral 10 in fig. 4 includes capacitors 1013 and 1014, and the cosine detection module includes capacitor 1023. By setting the values of the capacitors 1013, 1014, and 1023, the phase delay of the voltage signals at the sine and cosine outputs of the variation 10 can be removed or reduced.

In this embodiment, the value of capacitor 1023 matches the inductance value of the cosine winding. In other words, when the value of the capacitor 1023 satisfies the condition of formula (6), that is:

the phase of the voltage signal at the cosine output of the resolver 10 is likewise substantially eliminated or reduced.

It will be appreciated that the above division of sine and cosine detection modules is for illustrative purposes only, and that one skilled in the art could vary the sine and cosine detection modules in a product according to the teachings of the present utility model, e.g., include two capacitors in the cosine detection module and one capacitor in the sine detection module.

Fig. 5 is a schematic diagram of a motor system according to an embodiment of the utility model.

The motor system includes a rotary transformer 10, a power source 20, a signal processing device 30, and a motor 40, wherein the power source 20 is electrically connected to the rotary transformer 10 to acquire a power source signal from the power source 20, and a state indicating signal corresponding to an operation state of the motor 40 is generated by electrically connecting the motor 40. After the state processing device 30 obtains the state indicating signal, the current working state of the motor 40, such as the position, angle, speed and other parameters of the motor, can be determined.

The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present utility model. It will be apparent to those skilled in the art that various modifications can be made to these embodiments and that the general principles described herein may be applied to other embodiments without the need for inventive faculty. Therefore, the present utility model is not limited to the embodiments described herein, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.

Claims

1. A rotary transformer, further comprising:

an excitation winding electrically connected to a power supply via a power supply interface for acquiring a power supply signal;

a sinusoidal detection module including a first sinusoidal output, a second sinusoidal output, and a sinusoidal winding disposed to generate a sinusoidal detection signal according to rotation of a rotor, wherein the sinusoidal detection module further includes a first capacitor and a second capacitor to reduce a phase of the sinusoidal detection signal from being affected by the sinusoidal winding, and the first capacitor is electrically connected between a first end of the sinusoidal winding and a load, and the second capacitor is electrically connected between a second end of the sinusoidal winding and the load; and

the cosine detection module comprises a first cosine output end, a second cosine output end and a cosine winding, wherein the cosine winding generates a cosine detection signal according to the rotation of the rotor, and the sine detection signal and the cosine detection signal are mutually orthogonal.

2. The rotary transformer of claim 1, wherein the capacitance value of the first capacitor and the capacitance value of the second capacitor match the inductance value of the sinusoidal winding.

3. The rotary transformer of claim 2, wherein the capacitance value of the first capacitor is equal to the capacitance value of the second capacitor.

4. The rotary transformer of claim 1, wherein the cosine detection module further comprises a third capacitor and a fourth capacitor to reduce the phase of the cosine detection signal from being affected by the cosine winding, and wherein the third capacitor is electrically connected between a first end of the cosine winding and a load, and wherein the second capacitor is electrically connected between a second end of the cosine winding and a load.

5. The rotary transformer of claim 4, wherein the capacitance value of the third capacitor and the capacitance value of the fourth capacitor match the inductance value of the cosine winding.

6. The rotary transformer of claim 5, wherein the capacitance value of the third capacitor is equal to the capacitance value of the fourth capacitor.

7. The rotary transformer of claim 1, wherein the cosine detection module further comprises a fifth capacitor to reduce the phase of the cosine detection signal from being affected by the cosine winding, wherein the fifth capacitor is electrically connected between the cosine winding and a load, and a capacitance value of the fifth capacitor matches an inductance value of the cosine winding.

8. The rotary transformer of claim 1, further comprising: a stator core, and the excitation winding, the sine winding, and the cosine winding are wound on the stator core.

9. An electric motor system comprising an electric motor, further comprising:

a rotary transformer according to any one of claims 1 to 8, electrically linked to the motor, for detecting an operating condition of the motor and generating a condition indicating signal;

a power supply electrically connected to the rotary transformer for providing a power signal to the rotary transformer; and

and the state processing device is electrically connected to the rotary transformer so as to receive the state indication signal and further determine the working state of the motor.