CN112165283A - Excitation output control method and device and motor - Google Patents
Excitation output control method and device and motor Download PDFInfo
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- CN112165283A CN112165283A CN202011074962.3A CN202011074962A CN112165283A CN 112165283 A CN112165283 A CN 112165283A CN 202011074962 A CN202011074962 A CN 202011074962A CN 112165283 A CN112165283 A CN 112165283A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/20—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field due to variation of continuously-variable ohmic resistance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2103/00—Controlling arrangements characterised by the type of generator
- H02P2103/20—Controlling arrangements characterised by the type of generator of the synchronous type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to the field of excitation control, in particular to an excitation output control method, an excitation output control device and a motor. Wherein the method comprises the following steps: a photoresistor is arranged in an excitation loop; and controlling a controllable light emitting diode to act on the photosensitive resistor by using the control data matrix so as to linearly control the resistance value of the photosensitive resistor and further linearly control the excitation output. The beneficial effects of the invention include: the invention realizes the accurate control of the excitation output through the controllable light emitting diode and the photoresistor. The exciting current controlled by the method of the invention is continuously changed, the current impact generated in the exciting voltage loop is smaller, and the stronger electromagnetic radiation interference and the damaging impact on the exciting winding in the existing scheme are eliminated. In addition, the use of a switching device is avoided, so that the excitation output controller has longer service life, and is more stable and durable in operation.
Description
Technical Field
The invention relates to the field of excitation control, in particular to an excitation output control method, an excitation output control device and a motor, which are used for reducing the volume of an excitation regulator, prolonging the service life of the excitation regulator and improving the excitation safety.
Background
The automatic excitation regulator (hereinafter referred to as automatic excitation regulator) refers to an electronic device which automatically outputs excitation current to a synchronous generator and a synchronous motor under the control of a microcomputer system so as to control the stable output of the synchronous generator and the synchronous motor.
The automatic excitation regulator manufacturers visible at present are numerous, the software and hardware are different, but the basic design principle is the same: the PWM signal is output by a microcomputer system to control a controllable switch device (such as a field effect transistor, an IGBT and the like; different choices of manufacturers and similar functions) to realize continuous and instantaneous on-off control of an excitation voltage loop, so that the average voltage of the excitation voltage loop is equivalently controlled, and the excitation current output to an excitation winding is finally controlled. The basic principle can be seen in fig. 1.
The main disadvantages of the prior art are the following:
1. the controllable switch element for the automatic exciter is generally expensive and is a component with the largest heat generation amount and radiation interference amount in a system, and the components are determined by the physical principle and material characteristics and are not possible to optimize. Therefore, the controllable switch elements in the automatic actuator are required to be additionally provided with a huge heat dissipation device, and the occupied space of the automatic actuator is further increased.
2. The physical principle of the controllable switch element determines that the successful service life of the switch is not very long, and no matter what material and technology are used for realizing the extension of the use times and time of the controllable switch element, the proportion of the successful on-off circuit of the controllable switch element is a descending curve, and finally the practical significance is lost. The controllable switching element therefore belongs to the consumable part in an automatic excitation regulator.
3. In the prior art, the excitation voltage loop is in a continuous on-off state, continuous surge impact can be generated if the circuit current is continuous, great electromagnetic interference can be generated on the periphery, and more importantly, the service life of the excitation winding can be shortened.
Therefore, a need exists for a more optimal excitation output control scheme.
Disclosure of Invention
To solve the technical problems in the background art, in one aspect of the present invention, there is provided a method of controlling an excitation output, the method including: a photoresistor is arranged in an excitation loop; and controlling a controllable light emitting diode to act on the photosensitive resistor by using the control data matrix so as to linearly control the resistance value of the photosensitive resistor and further linearly control the excitation output.
In one or more embodiments, the controlling the resistance of the photoresistor by acting on the photoresistor by using the controllable light emitting diode includes: generating PWM control signals according to a control array matrix obtained in advance; and controlling the illumination intensity of the light emitting diode according to the conduction frequency and the duty ratio of the PWM control signal so as to control the resistance value of the photosensitive resistor.
In one or more embodiments, the control array matrix is obtained based on an illumination characteristic curve of the photoresistor, and the specific process includes: dividing the illumination characteristic curve of the photoresistor into a plurality of intervals; calculating the illumination intensity required by each change of the resistance by 1 ohm corresponding to each interval; generating a control array corresponding to the illumination intensity, and obtaining a control array matrix according to a plurality of control arrays obtained from a plurality of intervals; the control array is used for generating PWM control signals with corresponding conduction frequencies and duty ratios, and further used for controlling the light emitting diodes to generate the illumination intensity required by 1 ohm per change.
In one or more embodiments, the excitation output control method further includes: and performing linear fitting on the obtained intervals.
In one or more embodiments, the turn-on frequency is determined by a frequency characteristic curve of the photoresistor, and specifically includes: and on the basis of the frequency characteristic curve, on the premise of ensuring the response sensitivity, selecting higher response frequency as the conduction frequency for controlling the controllable light-emitting diode.
In one or more embodiments, the excitation output control method further includes: a thermostat is provided to ensure stability of the response frequency of the photoresistor.
In one or more embodiments, the excitation output control method further includes: the response lag time of the photoresistor is compensated by PID control.
In another aspect of the present invention, there is provided a field output control device including: the excitation main control module specifically comprises a control unit and a controllable light emitting diode; the control unit is preset with a control array matrix and is used for generating PWM control signals according to the control array matrix; the controllable light emitting diode is connected with the control unit and used for generating corresponding illumination intensity according to the obtained PWM control signal; the excitation slave control module comprises one or more photoresistors and is used for being arranged in an excitation loop of the motor, and changing the resistance value of the excitation slave control module according to the illumination intensity so as to change the excitation current in the excitation loop.
In one or more embodiments, the control array matrix is obtained based on an illumination characteristic curve of the photoresistor, and the specific process includes: dividing the illumination characteristic curve of the photoresistor into a plurality of intervals; calculating the illumination intensity required by each change of the resistance by 1 ohm corresponding to each interval; generating a control array corresponding to the illumination intensity, and obtaining a control array matrix according to a plurality of control arrays obtained from a plurality of intervals; the control array is used for generating PWM control signals with corresponding conduction frequencies and duty ratios, and further used for controlling the light emitting diodes to generate the illumination intensity required by 1 ohm per change.
In yet another aspect of the present invention, there is also provided a motor including: the excitation output control device as described above.
The beneficial effects of the invention include: the invention realizes the accurate control of the excitation output through the controllable light emitting diode and the photoresistor. The exciting current controlled by the method of the invention is continuously changed, the current impact generated in the exciting voltage loop is smaller, and the stronger electromagnetic radiation interference and the damaging impact on the exciting winding in the existing scheme are eliminated. In addition, because the volumes of the precise light-emitting diode and the precise photoresistor are smaller, and the heat dissipation requirement in the working process is easier to meet, the volume of the constant temperature device is smaller, so that the volume of the excitation output control device (excitation regulator) is smaller, and the application of the excitation output control device in the practical process is more convenient. In addition, the use of a switching device is avoided, so that the excitation output controller has longer service life, and is more stable and durable in work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional automatic excitation output control;
FIG. 2 is a block flow diagram of an excitation output control method of the present invention;
FIG. 3 is a diagram illustrating an illumination characteristic curve of a photo-resistor;
FIG. 4 is a schematic diagram of frequency characteristics of different types of photo resistors;
FIG. 5 is a schematic diagram of the temperature versus response time characteristic of a lead sulfide photoresistor;
FIG. 6 is a diagram showing the response time characteristic of the lead sulfide photoresistor;
fig. 7 is a schematic structural diagram of an embodiment of an excitation output control device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
The existing excitation output control is realized by the control of an excitation regulator. However, the field regulator obtained based on the existing field output control method has a large volume, a short life, and continuously generates electromagnetic interference during operation. In view of the above problems, the present invention provides a method for controlling excitation output, so as to improve the above drawbacks and achieve a better excitation output control effect. The detailed technical scheme of the invention is as follows:
fig. 2 is a flow chart of an excitation output control method of the present invention. In the embodiment shown in fig. 1, the flow of the excitation output control method of the present invention includes: step 100, setting a photoresistor in an excitation loop; and 200, controlling a controllable light emitting diode to act on the photosensitive resistor by using the control data matrix to linearly control the resistance value of the photosensitive resistor so as to linearly control excitation output.
For step 100, optionally, the arrangement manner of the light dependent resistor in the excitation circuit is to connect in series in the excitation circuit; alternatively, it is arranged in the excitation circuit in parallel with other electrical components. Wherein the other electrical components include: resistance, inductance, and/or capacitance. In practical applications, the types of the photoresistors include: cadmium sulfide (CdS), indium antimonide (InSb), lead sulfide (PbS), and the like. The light characteristic curve, the frequency characteristic curve, the temperature characteristic curve and the response time characteristic curve of each type of photoresistor are different. For this reason, before step 100, the excitation output control method of the present invention further includes: the photo-resistors are selected according to the characteristics of the various photo-resistors. In an alternative embodiment, a photoresistor is selected for implementing the method of the invention; in another alternative embodiment, multiple photoresistors are selected to cooperate to implement the method of the present invention according to the characteristics of different types of photoresistors.
For step 200, specifically, the controlling the resistance value of the photo resistor by using the controllable light emitting diode to act on the photo resistor includes: generating PWM control signals according to a control array matrix obtained in advance; and controlling the illumination intensity of the light emitting diode according to the conduction frequency and the duty ratio of the PWM control signal so as to control the resistance value of the photosensitive resistor. The illumination intensity of the controllable light emitting diode is in direct proportion to the amount of current flowing in unit time, so that the illumination intensity of the controllable light emitting diode can be adjusted through the control of the conduction frequency and the duty ratio of a PWM control signal through the PWM control signal output by the excitation microcomputer. Since the operating current of the controllable light emitting diode is very small (in the milliamp range), the current surge caused by the duty cycle variation of the PWM signal is completely negligible.
More specifically, the controllable light emitting diode and the light dependent resistor are designed within a special sealed housing, the light dependent resistor being completely controlled by the light emission of the controllable light emitting diode. When the excitation microcomputer adjusts the illumination intensity of the controllable light emitting diode through the PWM control signal, the resistance value of the acted photosensitive resistor changes. Since the light sensitive resistor is arranged in the excitation loop, the change of the resistance value of the light sensitive resistor causes the change of the excitation current, thereby realizing the control of the output of the excitation winding. The excitation current controlled by the mode is continuously changed, so that current impact cannot be generated in an excitation loop, stronger electromagnetic radiation interference in the existing scheme is eliminated, and the damaging impact on an excitation winding is reduced.
Further, the control array matrix is obtained based on the illumination characteristic curve of the photoresistor, and the specific process includes: dividing the illumination characteristic curve of the photoresistor into a plurality of intervals; calculating the illumination intensity required by each change of the resistance by 1 ohm corresponding to each interval; generating a control array corresponding to the illumination intensity, and obtaining a control array matrix according to a plurality of control arrays obtained from a plurality of intervals; the control array is used for generating PWM control signals with corresponding conduction frequencies and duty ratios, and further used for controlling the light emitting diodes to generate the illumination intensity required by 1 ohm per change. The light characteristic curve of the photoresistor is shown in fig. 3.
Fig. 3 is a diagram illustrating an illumination characteristic curve of the photo resistor. In the embodiment shown in fig. 3, the invention selects a lead sulfide type photo resistor as an application object of the method of the invention. As shown in fig. 3, the light characteristic curve of the photo-resistor reflects the resistance of the photo-resistor as a function of the intensity of light to which the photo-resistor is exposed. As shown in fig. 3, most photoresistors do not have a linear correspondence to illumination intensity. Therefore, in order to realize linear control, the excitation output control method of the present invention further includes: after the illumination characteristic curve of the photoresistor is divided into a plurality of intervals, the obtained intervals are subjected to linear fitting.
The above process is a process for a general photo resistor. In another embodiment of the present invention, a precision photo-resistor is selected as the object of the application of the method of the present invention. The precise photosensitive resistor has a more linear relationship between the resistance value and the illumination intensity. Correspondingly, the controllable light emitting diode can also be selected as a precise controllable light emitting diode to realize the precise control of the generated illumination intensity.
Further, since the photoresistor has a photoelectric relaxation phenomenon, it takes a certain time to reach a stable resistance value from the time of exposure to light. And vice versa. Therefore, the photoresistors of different materials have the most suitable frequency response range. It determines the frequency of the controlled conduction of the controllable light emitting diode, i.e. the conduction frequency; and, the illumination intensity control can be more accurately achieved due to the higher on frequency. Thus, the method of the invention further comprises: and on the basis of the frequency characteristic curve, on the premise of ensuring the response sensitivity, selecting higher response frequency as the conduction frequency for controlling the controllable light-emitting diode. Wherein the frequency characteristic curves of the photoresistors of different materials are shown in figure 4.
Fig. 4 is a diagram illustrating frequency characteristics of different types of photo resistors. Wherein the horizontal axis is the response frequency and the vertical axis is the relative sensitivity. Wherein curve 1 corresponds to a cesium photoresistor, curve 2 corresponds to a cobalt photoresistor, curve 3 corresponds to a thallium sulfide photoresistor, and curve 4 corresponds to a lead sulfide photoresistor. As can be seen from fig. 4, the lead sulfide photoresistor has a wide frequency response range in a high response sensitivity range. Thus, it is in one embodiment of the present invention that lead sulfide photoresistors are selected as the subject of the method of the present invention; and, a response frequency of 100HZ or its vicinity is selected as a frequency for controlling the on-state of the light emitting diode. The higher conduction frequency is more beneficial to accurately controlling the illumination intensity of the controllable light emitting diode.
In addition to having a photo-relaxation phenomenon, the photoresistor has a response time that is temperature dependent. Specifically, the dark resistance and response time of the photoresistor as a function of temperature are shown in FIG. 5.
Fig. 5 is a diagram showing the temperature versus response time characteristic of a lead sulfide photoresistor. As shown in fig. 5, the abscissa is temperature and the ordinate is relative value. As can be seen from the trend of the graph shown in fig. 5, the dark resistance or the response time (rise time) of the lead sulfide photoresistor decreases with the temperature. Therefore, in order to ensure that the photoresistor operates in a stable response frequency range, the operating temperature of the photoresistor needs to be controlled.
Further, the method of the present invention further comprises: a thermostat is provided to ensure stability of the response frequency of the photoresistor. In one embodiment, the precision light emitting diode and the precision light dependent resistor are designed within a special sealed housing, the light dependent resistor being completely controlled by the light emission of the light emitting diode.
Although the control accuracy of the method of the present invention is improved by selecting the type of the photo resistor, selecting a higher response frequency as the on-frequency of the PWM control signal, and maintaining the temperature, the response delay of the photo resistor is unavoidable. Therefore, in order to further improve the implementability and control accuracy of the method of the present invention, the method of the present invention further proposes to perform adjustment by PID control to compensate the response lag time of the photoresistor, which is specifically described as follows:
fig. 6 is a response time characteristic curve diagram of the lead sulfide photoresistor. Wherein the abscissa is the response time and the ordinate is the photocurrent. As shown in fig. 6, when light of a certain intensity is applied to the lead sulfide photo-resistor at 3 milliseconds, the photocurrent begins to rise until the photocurrent stops rising at 5 milliseconds and remains unchanged until the light is stopped at about 13ms and the photocurrent begins to drop until it falls to 0 at 15 milliseconds. That is, in the embodiment shown in fig. 6, the response lag time of the lead sulfide photo resistor is about 2 msec, and thus, the response lag time can be compensated for by advancing the illumination time by about 2 msec using the PID control.
Regarding how the compensation amount is controlled by the PID in practical application, in an alternative embodiment, a plurality of response lag data are obtained by actual multiple measurements, and the compensation amount at the PID control end is obtained by calculating an average value. In another alternative embodiment, the compensation amount (i.e., the response lag time corresponding to the vertex) of the PID control is determined according to the positive distribution map by counting the normal distribution of the plurality of lag data.
By the method and the embodiment, the invention realizes the accurate control of the excitation output through the controllable light emitting diode and the photoresistor. The exciting current controlled by the method of the invention is continuously changed, the current impact generated in the exciting voltage loop is smaller, and the stronger electromagnetic radiation interference and the damaging impact on the exciting winding in the existing scheme are eliminated.
On the basis of the excitation output control method, the invention also provides an excitation output control device, which comprises the following specific structures: the excitation main control module specifically comprises a control unit and a controllable light emitting diode; the control unit is preset with a control array matrix and is used for generating PWM control signals according to the control array matrix; the controllable light emitting diode is connected with the control unit and used for generating corresponding illumination intensity according to the obtained PWM control signal; the excitation slave control module comprises one or more photoresistors and is used for being arranged in an excitation loop of the motor, and changing the resistance value of the excitation slave control module according to the illumination intensity so as to change the excitation current in the excitation loop. The control array matrix is obtained based on the illumination characteristic curve of the photoresistor, and the specific process comprises the following steps: dividing the illumination characteristic curve of the photoresistor into a plurality of intervals; calculating the illumination intensity required by each change of the resistance by 1 ohm corresponding to each interval; generating a control array corresponding to the illumination intensity, and obtaining a control array matrix according to a plurality of control arrays obtained from a plurality of intervals; the control array is used for generating PWM control signals with corresponding conduction frequencies and duty ratios, and further used for controlling the light emitting diodes to generate the illumination intensity required by 1 ohm per change. The concrete structure thereof is selectable as follows
Fig. 7 is a schematic structural diagram of an embodiment of an excitation output control device according to the present invention. In the embodiment shown in fig. 7, the excitation output control device of the present invention includes: the device comprises a control unit, a precise light emitting diode, a precise photoresistor, an excitation winding and an excitation power supply. The precise light-sensitive resistor is connected in series in the excitation circuit and used for receiving illumination from the precise light-emitting diode; the precise light-emitting diode receives the PWM control signal from the control unit and generates light with corresponding light intensity according to the conduction frequency and the duty ratio of the PWM control signal; the control unit is internally preset with a control array matrix for generating PWM control signals with corresponding conduction frequency and duty ratio, wherein the precise light-emitting diode and the precise photoresistor are sealed in an enclosure for avoiding the interference of other light sources and playing a role in protection.
In a further embodiment, a thermostat device is also provided outside or inside the enclosure. The device is used for ensuring the working stability of the precise light-emitting diode and the precise photoresistor.
Because the volumes of the precise light-emitting diode and the precise photoresistor are smaller, and the heat dissipation requirement in the working process is easier to meet, the volume of the constant temperature device is smaller, so that the volume of the excitation output control device (excitation regulator) is smaller, and the excitation output control device is more convenient in the practical application process. In addition, the use of a switching device is avoided, so that the excitation output controller has longer service life, and is more stable and durable in operation.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (10)
1. A method of controlling an excitation output, the method comprising:
a photoresistor is arranged in an excitation loop;
and controlling a controllable light emitting diode to act on the photosensitive resistor by using the control data matrix so as to linearly control the resistance value of the photosensitive resistor and further linearly control the excitation output.
2. The excitation output control method according to claim 1, wherein said controlling the controllable light emitting diode to act on the photo-resistor by using the control data matrix to linearly control the resistance value of the photo-resistor comprises:
generating PWM control signals according to a control array matrix obtained in advance;
and controlling the illumination intensity of the light emitting diode according to the conduction frequency and the duty ratio of the PWM control signal, so as to linearly control the resistance value of the photosensitive resistor.
3. The excitation output control method according to claim 2, wherein the control array matrix is obtained based on an illumination characteristic curve of the photo resistor, and includes:
dividing the illumination characteristic curve of the photoresistor into a plurality of intervals;
calculating the illumination intensity required by each change of the resistance by 1 ohm corresponding to each interval;
generating a control array corresponding to the illumination intensity, and obtaining a control array matrix according to a plurality of control arrays obtained from a plurality of intervals;
the control array is used for generating PWM control signals with corresponding conduction frequencies and duty ratios, and further used for controlling the light emitting diodes to generate the illumination intensity required by 1 ohm per change.
4. The excitation output control method according to claim 3, further comprising: and performing linear fitting on the obtained intervals.
5. The excitation output control method according to claim 3, wherein the on-frequency is determined by a frequency characteristic curve of the photo resistor, and specifically includes:
and on the basis of the frequency characteristic curve, on the premise of ensuring the response sensitivity, selecting higher response frequency as the conduction frequency for controlling the controllable light-emitting diode.
6. The excitation output control method according to any one of claims 1 to 5, further comprising: a thermostat is provided to ensure stability of the response frequency of the photoresistor.
7. The excitation output control method according to any one of claims 1 to 5, further comprising: the response lag time of the photoresistor is compensated by PID control.
8. A field output control device, characterized by comprising:
the excitation main control module specifically comprises a control unit and a controllable light emitting diode; the control unit is preset with a control array matrix and is used for generating PWM control signals according to the control array matrix; the controllable light emitting diode is connected with the control unit and used for generating corresponding illumination intensity according to the obtained PWM control signal;
the excitation slave control module comprises one or more photoresistors and is used for being arranged in an excitation loop of the motor, and changing the resistance value of the excitation slave control module according to the illumination intensity so as to change the excitation current in the excitation loop.
9. The excitation output control apparatus according to claim 8, wherein the control array matrix is obtained based on an illumination characteristic curve of the photo resistor, and includes: dividing the illumination characteristic curve of the photoresistor into a plurality of intervals; calculating the illumination intensity required by each change of the resistance by 1 ohm corresponding to each interval; generating a control array corresponding to the illumination intensity, and obtaining a control array matrix according to a plurality of control arrays obtained from a plurality of intervals; the control array is used for generating PWM control signals with corresponding conduction frequencies and duty ratios, and further used for controlling the light emitting diodes to generate the illumination intensity required by 1 ohm per change.
10. An electric machine, characterized in that the electric machine comprises: the excitation output control apparatus according to claim 8 or 9.
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| CN202011074962.3A CN112165283B (en) | 2020-10-09 | 2020-10-09 | Excitation output control method and device and motor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102034889A (en) * | 2010-10-15 | 2011-04-27 | 深圳和而泰智能控制股份有限公司 | Photosensitive potentiometer and regulating method thereof |
| CN202550957U (en) * | 2012-03-27 | 2012-11-21 | 株洲南方燃气轮机成套制造安装有限公司 | Excitation device |
| CN105425159A (en) * | 2015-11-16 | 2016-03-23 | 国家电网公司 | Device and method for detecting remaining power of battery |
| CN109037384A (en) * | 2018-09-05 | 2018-12-18 | 宁波科尔维特照明有限公司 | Adjustable photo resistance |
| CN208352469U (en) * | 2017-12-18 | 2019-01-08 | 上海航天工业（集团）有限公司 | A kind of battery management system |
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2020
- 2020-10-09 CN CN202011074962.3A patent/CN112165283B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034889A (en) * | 2010-10-15 | 2011-04-27 | 深圳和而泰智能控制股份有限公司 | Photosensitive potentiometer and regulating method thereof |
| CN202550957U (en) * | 2012-03-27 | 2012-11-21 | 株洲南方燃气轮机成套制造安装有限公司 | Excitation device |
| CN105425159A (en) * | 2015-11-16 | 2016-03-23 | 国家电网公司 | Device and method for detecting remaining power of battery |
| CN208352469U (en) * | 2017-12-18 | 2019-01-08 | 上海航天工业（集团）有限公司 | A kind of battery management system |
| CN109037384A (en) * | 2018-09-05 | 2018-12-18 | 宁波科尔维特照明有限公司 | Adjustable photo resistance |
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