CN112104273A

CN112104273A - Silicon controlled speed regulation harmonic current control method for motor

Info

Publication number: CN112104273A
Application number: CN201910524073.3A
Authority: CN
Inventors: 韦启峰
Original assignee: Suzhou Chunju Electric Co Ltd
Current assignee: Suzhou Chunju Electric Co Ltd
Priority date: 2019-06-17
Filing date: 2019-06-17
Publication date: 2020-12-18

Abstract

The invention provides a silicon controlled speed regulation harmonic current control method of a motor, which comprises the following steps: 1) detecting a zero crossing position; 2) detecting the control position of the controlled silicon; 3) and after the control bit position is detected, controlling the corresponding opening mode of the controllable silicon within the set control bit angle. Compared with the prior art, the invention can effectively control the motor emc to test the harmonic current exceeding the standard so as to lead the harmonic current to reach the standard range.

Description

Silicon controlled speed regulation harmonic current control method for motor

Technical Field

The invention relates to a motor current control method, in particular to a silicon controlled speed regulation harmonic current control method of a motor, and further in particular to a silicon controlled speed regulation harmonic current control method of a 1400-2000W motor.

Background

The thyristor is a high-power semiconductor device with a four-layer structure of three PN junctions, and is also called a thyristor. The semiconductor device has the characteristics of small volume, relatively simple structure, strong function and the like, and is one of the commonly used semiconductor devices. The device is widely used in various electronic apparatuses and electronic products, such as motors.

During the speed regulation of the motor by the controlled silicon, the triode is controlled by the potentiometer, the control electrode of the controlled silicon is controlled by the triode, and the conduction angle of the controlled silicon is controlled to control the rotating speed of the motor. In the prior motor silicon controlled speed regulation, the emc test harmonic current often generates an overproof phenomenon, and the current can not be automatically regulated to reach a standard range.

Disclosure of Invention

In view of this, the invention provides a method for controlling the speed-regulating harmonic current of the thyristor of the motor, which can effectively control the emc testing harmonic current to exceed the standard, so that the harmonic current can reach the standard range.

The invention provides a silicon controlled speed regulation harmonic current control method of a motor, which comprises the following steps:

1) detecting a zero crossing position;

2) detecting the control position of the controlled silicon;

3) and after the control bit position is detected, controlling the corresponding opening mode of the controllable silicon within the set control bit angle.

Further, in the step 1), the system determines whether a zero-crossing signal is detected, if not, the detection is continued, and if a zero-crossing signal is detected, the step 2) is performed.

Further, the step 2) includes the following substeps:

21) initializing assignment and starting to detect the completion of soft start;

22) completing soft start detection;

23) the detection of the thyristor control position is started.

Further, in the step 22), the system determines whether the soft start detection is completed, and returns to the step 21 if the soft start detection is not completed), and continues to the step 23) if the soft start detection is completed.

Further, in the step 3), when the control bit is at 0 degree, the thyristor is turned on at 0 degree.

Further, in the step 3), when the control bit is 0-80 degrees, the controllable silicon is randomly turned on at 0-80 degrees according to the power proportion.

Further, in the step 3), when the control bit is at 90 degrees, the thyristor is randomly turned on at 100 degrees and 180 degrees according to the power ratio.

Further, in the step 3), when the control bit is at 180 degrees of 100-.

The invention provides a method for controlling the speed regulation harmonic current of a thyristor of a motor, which can effectively control the motor emc to test the harmonic current exceeding standard by mainly controlling the corresponding opening mode of the thyristor in a set control bit angle, so that the harmonic current can reach the standard range.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a flowchart of an implementation of a thyristor controlled harmonic current control method for a motor according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Referring to fig. 1, a method for controlling a thyristor controlled speed harmonic current of an electric motor according to an embodiment of the present invention is shown, which includes the following steps:

s1: detecting the zero crossing position: the system judges whether the zero-crossing signal is detected, if not, the detection is continued, and if the zero-crossing signal is detected, the step 2) is carried out;

s2: and (3) detecting the control position of the controllable silicon:

22) soft start detection is completed: the system judges whether the soft start detection is finished, if not, the step 21) is returned, and if the soft start detection is finished, the step 23) is continued;

23) starting the detection of the control position of the controlled silicon;

s3: after the control bit position is detected, controlling the corresponding opening mode of the controllable silicon within the set control bit angle:

when the control position is 0 degree, the controllable silicon is started at 0 degree;

when the control position is 0-80 degrees, the controllable silicon is randomly opened at 0-80 degrees according to the power proportion;

when the control bit is at 90 degrees, the controllable silicon is randomly opened at 100-180 degrees according to the power proportion;

when the control bit is at 100-180 degrees, the controllable silicon is randomly turned on at 100-180 degrees according to the power proportion.

In specific implementation, the control algorithm of the thyristor speed regulation harmonic current control method of the motor according to the embodiment is as follows:

therefore, according to the embodiment, the method for controlling the speed-regulating harmonic current of the thyristor of the motor provided by the invention can effectively control the motor emc to test the harmonic current exceeding the standard by mainly controlling the corresponding opening mode of the thyristor within the set control bit angle, so that the harmonic current can reach the standard range.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A silicon controlled speed regulation harmonic current control method of a motor is characterized by comprising the following steps:

1) detecting a zero crossing position;

2) detecting the control position of the controlled silicon;

2. The silicon controlled speed regulation harmonic current control method of the motor according to claim 1, wherein in the step 1), the system judges whether a zero-crossing signal is detected, if not, the detection is continued, and if the zero-crossing signal is detected, the step 2) is performed.

3. A thyristor controlled speed harmonic current control method of an electric motor according to claim 1 or 2, characterized in that said step 2) comprises the following sub-steps:

22) completing soft start detection;

23) the detection of the thyristor control position is started.

4. The method as claimed in claim 3, wherein in step 22), the system determines whether the soft start detection is completed, if not, the system returns to step 21), and if so, the system continues to step 23).

5. The method as claimed in claim 1, wherein in step 3), when the control bit is 0 degree, the thyristor is turned on at 0 degree.

6. The method as claimed in claim 1, wherein in step 3), when the control bit is 0-80 degrees, the thyristor is turned on at 0-80 degrees at random according to the power ratio.

7. The method as claimed in claim 1, wherein in step 3), when the control bit is at 90 degrees, the thyristors are turned on randomly at 100 and 180 degrees according to the power ratio.

8. The method as claimed in claim 1, wherein in step 3), when the control bit is at 100-.