CN116937503B - Motor rotation speed control device - Google Patents
Motor rotation speed control device Download PDFInfo
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- CN116937503B CN116937503B CN202310891334.1A CN202310891334A CN116937503B CN 116937503 B CN116937503 B CN 116937503B CN 202310891334 A CN202310891334 A CN 202310891334A CN 116937503 B CN116937503 B CN 116937503B
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- 238000012544 monitoring process Methods 0.000 claims description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- Control Of Ac Motors In General (AREA)
Abstract
The application relates to a motor rotating speed control device, which belongs to the technical field of motor equipment and comprises a starting control circuit, a starting circuit, a speed stabilizing control circuit and a motor, wherein the starting circuit comprises a pulse width modulation circuit and a power output circuit; the starting circuit is electrically connected with the motor through a three-phase line by the power output circuit, the speed stabilizing control circuit is electrically connected with the three-phase line, and a real-time rotating speed voltage signal of the motor is obtained by the speed stabilizing control circuit; the starting circuit further comprises a control module electrically connected with the pulse width modulation circuit, and the control module is used for: and adjusting the current output power according to the set rotating speed pulse width signal and the real-time rotating speed pulse width signal to enable the real-time rotating speed pulse width signal to be matched with the set rotating speed pulse width signal. The application can ensure the stable running of the motor even under the condition of load change.
Description
Technical Field
The application relates to the field of motor equipment, in particular to a motor rotating speed control device.
Background
An electric machine (English: ELECTRIC MACHINERY, commonly called a "motor") refers to an electromagnetic device that converts or transmits electric energy according to the law of electromagnetic induction. The motor is divided into a motor and a generator. In the running process of the motor, the rotating speed of the motor can be influenced by load or resistance and the like, so that the motor cannot run according to the set rotating speed.
Disclosure of Invention
In order to solve the problems, the application provides a motor rotation speed control device.
The application provides a motor rotating speed control device which adopts the following technical scheme:
The motor rotating speed control device comprises a starting control circuit, a starting circuit, a speed stabilizing control circuit and a motor, wherein the starting circuit comprises a pulse width modulation circuit and a power output circuit, the starting circuit is respectively and electrically connected with the starting control circuit and the speed stabilizing control circuit through the pulse width modulation circuit, and a set rotating speed voltage signal is obtained through the starting control circuit; the starting circuit is electrically connected with the motor through a three-phase line through the power output circuit, the speed stabilizing control circuit is electrically connected with the three-phase line, the real-time rotating speed voltage signal of the motor is obtained through the speed stabilizing control circuit, the real-time rotating speed voltage signal is converted into a real-time rotating speed pulse width signal through the pulse width modulation circuit, and the set rotating speed voltage signal is converted into a set rotating speed pulse width signal; the starting circuit further comprises a control module electrically connected with the pulse width modulation circuit, and the control module is used for: and adjusting the current output power according to the set rotating speed pulse width signal and the real-time rotating speed pulse width signal to enable the real-time rotating speed pulse width signal to be matched with the set rotating speed pulse width signal.
The scheme is that a real-time rotating speed voltage signal of the motor is acquired through a speed stabilizing control circuit, and the real-time rotating speed voltage signal is converted into a real-time rotating speed pulse width signal through a pulse width modulation circuit; the set rotating speed voltage signal is obtained through the starting control circuit, and the set rotating speed voltage signal is converted into a set rotating speed pulse width signal through the pulse width modulation circuit. The control module dynamically adjusts the current output power according to the set rotating speed pulse width signal and the real-time rotating speed pulse width signal, so that the real-time rotating speed pulse width signal is matched with the set rotating speed pulse width signal, and stable speed operation of the motor can be ensured even under the condition of load change.
Preferably, the motor comprises a Hall sensor, the starting circuit comprises a Hall signal processing circuit, the Hall sensor is electrically connected with the Hall signal processing circuit, the Hall signal processing circuit is respectively electrically connected with the starting control circuit and the control module, and the starting control circuit is used for acquiring a polarity signal in a set direction and a rotating speed voltage signal.
The starting control circuit is electrically connected with the Hall signal processing circuit, and the polarity signal of the set direction collected by the starting control circuit is transmitted to the Hall signal processing circuit, so that the Hall signal processing circuit transmits the direction information of the rotation of the motor to the control module, and the control module controls the current direction.
Preferably, the start control circuit comprises a sample holder, the sample holder is provided with a sample holder switch, the sample holder is electrically connected with the hall signal processing circuit, the polarity signal in the set direction is transmitted to the hall signal processing circuit through the sample holder, the sample holder circuit is electrically connected with the pulse width modulation circuit, and the voltage signal in the set rotating speed is transmitted to the pulse width modulation circuit through the sample holder.
According to the scheme, the sampling retainer is arranged, so that the starting control circuit can control sampling, retaining and sampling release when sampling the polarity signal in the set direction and the voltage signal in the set rotating speed, the polarity signal in the set direction is transmitted to the Hall signal processing circuit through the sampling retainer, and the voltage signal in the set rotating speed is transmitted to the pulse width modulation circuit.
Preferably, the starting control circuit further comprises a slide bar potentiometer and an absolute value converter, wherein the slide bar potentiometer, the absolute value converter and the sampling holder are sequentially and electrically connected, and the set direction polarity signal and the set rotating speed voltage signal are adjusted through the slide bar potentiometer.
The scheme enables a user to adjust the rotating direction (for example, forward rotation or reverse rotation or stopping rotation) and the rotating speed of the motor according to the needs through the sliding rod potentiometer and the absolute value transducer. Specifically, a set direction polarity signal and a set rotation speed voltage signal are obtained based on the operation of a slide bar potentiometer by a user.
Preferably, the speed stabilizing control circuit comprises a pulse frequency sampling circuit and a rotating speed signal conversion circuit, wherein the pulse frequency sampling circuit is electrically connected with the voltage conversion circuit, the voltage conversion circuit is electrically connected with the pulse width modulation circuit, and the pulse frequency sampling circuit is connected with the three-phase line.
According to the scheme, the pulse frequency sampling circuit is used for acquiring the pulse frequency signal, so that the motor rotating speed is sampled. The collected real-time pulse frequency signals are converted into real-time rotating speed voltage signals through the voltage conversion circuit, so that the actual rotating speed condition of the motor is determined based on the real-time rotating speed voltage signals.
Preferably, the starting circuit further comprises a driving circuit, and the driving circuit is electrically connected with the power output circuit and the control module respectively.
The scheme provides corresponding power for motor operation through the motor driving circuit and the power output circuit.
Preferably, the power supply further comprises a current sensor, wherein the current sensor is respectively and electrically connected with the power output circuit and the pulse width modulation circuit, the real-time voltage value of the power output circuit is monitored through the current sensor so as to be transmitted to the pulse width modulation circuit, the real-time voltage value is converted into a real-time voltage pulse width signal through the pulse width modulation circuit, and the control module is further used for: when the real-time voltage pulse width signal meets the shutdown condition, a shutdown instruction is sent to a driving circuit to shut down the motor; and when the real-time voltage pulse width signal reaches the maximum pulse width threshold value, sending instruction information for reducing the output power to the driving circuit.
According to the scheme, the current sensor is arranged, so that safety monitoring of the motor is realized, and the motor is prevented from being damaged in the process of stable speed control. For example, when the real-time voltage pulse width signal satisfies a shutdown condition, shutdown instruction information is transmitted to the drive circuit to shut down the motor. And when the real-time voltage pulse width signal reaches the maximum pulse width threshold value, sending instruction information for reducing the output power to the driving circuit. The motor is prevented from being damaged in the process of steady speed control.
Preferably, the shutdown conditions include at least any one of:
the real-time voltage pulse width signal is greater than a maximum pulse width threshold;
The real-time voltage pulse width signal is in the target pulse width interval, and the real-time rotating speed pulse width signal is equal to or larger than the maximum rotating speed pulse width signal;
the real-time voltage pulse width signal is in the target pulse width interval, and the real-time rotating speed pulse width signal is equal to or smaller than the minimum rotating speed pulse width signal.
According to the scheme, the shutdown condition is set, the abnormality of the motor is monitored while the motor is controlled at a stable speed, and the motor is prevented from being damaged.
Preferably, the motor further comprises a power supply which is electrically connected with the motor, the starting circuit, the starting control circuit and the speed stabilizing control circuit respectively.
In the working process of the motor rotating speed control device, the scheme supplies power for each circuit module through a power supply.
Preferably, the power supply comprises an external power supply and an internal power supply, wherein the internal power supply is respectively and electrically connected with the motor, the starting circuit, the starting control circuit and the speed stabilizing control circuit, and the external power supply is electrically connected with the internal power supply through a power switch.
The scheme integrates an internal power supply into the circuit by arranging the internal power supply so as to supply power for each circuit module through the internal power supply.
In summary, the application has the following beneficial effects:
1. Acquiring a real-time rotating speed voltage signal of the motor through a speed stabilizing control circuit, and converting the real-time rotating speed voltage signal into a real-time rotating speed pulse width signal through a pulse width modulation circuit; the set rotating speed voltage signal is obtained through the starting control circuit, and the set rotating speed voltage signal is converted into a set rotating speed pulse width signal through the pulse width modulation circuit. The control module dynamically adjusts the current output power according to the set rotating speed pulse width signal and the real-time rotating speed pulse width signal, so that the real-time rotating speed pulse width signal is matched with the set rotating speed pulse width signal, and stable speed operation of the motor can be ensured even under the condition of load change.
2. Through setting up the current sensor, realize the safety monitoring to the motor to avoid the motor to be damaged at the in-process of steady speed control. For example, when the real-time voltage pulse width signal satisfies a shutdown condition, shutdown instruction information is transmitted to the drive circuit to shut down the motor. And when the real-time voltage pulse width signal reaches the maximum pulse width threshold value, sending instruction information for reducing the output power to the driving circuit. The motor is prevented from being damaged in the process of steady speed control.
Drawings
Fig. 1 is a schematic circuit diagram of a motor rotation speed control device according to an embodiment of the present application;
Reference numerals illustrate: 11. a pulse width modulation circuit; 12. a power output circuit; 13. a control module; 14. a driving circuit; 15. a hall signal processing circuit; 21. a motor; 22. a hall sensor; 31. a sample holder; 32. a sample-and-hold switch; 33. a slide bar potentiometer; 34. an absolute value converter; 41. a pulse frequency sampling circuit; 42. a voltage conversion circuit; 51. a current sensor; 61. an internal power supply; 62. an external power source; 63. and a power switch.
Detailed Description
The present application will be described in further detail with reference to fig. 1.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiment of the application discloses a motor rotating speed control device which is mainly used for adjusting the rotating speed of a motor, so that the motor can run at a stable speed under the condition of load change. For this purpose, the application mainly adopts the following ideas:
referring to fig. 1, a motor 21 rotation speed control device comprises a start control circuit, a start circuit, a speed stabilizing control circuit and a motor 21, wherein the start circuit comprises a pulse width modulation circuit 11 and a power output circuit 12, the start circuit is respectively and electrically connected with the start control circuit and the speed stabilizing control circuit through the pulse width modulation circuit 11, and a set rotation speed voltage signal is obtained through the start control circuit; the starting circuit is electrically connected with the motor 21 through a three-phase line by the power output circuit 12, the speed stabilizing control circuit is electrically connected with the three-phase line, the real-time rotating speed voltage signal of the motor 21 is obtained through the speed stabilizing control circuit, the real-time rotating speed voltage signal is converted into a real-time rotating speed pulse width signal through the pulse width modulation circuit 11, and the set rotating speed voltage signal is converted into a set rotating speed pulse width signal; the start-up circuit further comprises a control module 13 electrically connected to the pulse width modulation circuit 11, the control module 13 being configured to: and adjusting the current output power according to the set rotating speed pulse width signal and the real-time rotating speed pulse width signal to enable the real-time rotating speed pulse width signal to be matched with the set rotating speed pulse width signal. Here, it is understood by those skilled in the art that the voltage signal may be converted into a pulse width signal by the pulse width modulation circuit 11 so that the control module 13 adjusts the output power according to the pulse width signal. In some embodiments, the matching of the real-time rotational speed pulse width signal to the set rotational speed pulse width signal includes, but is not limited to: the real-time rotating speed pulse width signal is consistent with the set rotating speed pulse width signal, or the difference value between the real-time rotating speed pulse width signal and the set rotating speed pulse width signal is equal to or smaller than a target difference value. In some embodiments, the three phase lines include, but are not limited to, three phase bridge lines, for example, the motor 21 includes a dc brushless motor 21, and the power output circuit 12 is electrically connected to the motor 21 through the three phase bridge lines. In some embodiments, the setting information set by the user (for example, the setting rotation speed voltage signal) is acquired by the start control circuit, so that the user can control the rotation speed of the motor 21. In some embodiments, the setting information further includes a setting direction polarity signal so that the user can also control the direction in which the motor 21 rotates (e.g., forward, reverse, or stall). In some embodiments, real-time information (e.g., real-time speed voltage signals) of the motor 21 is obtained by a steady-speed control circuit to monitor real-time speed conditions of the motor 21. For example, when the load of the motor 21 changes (for example, when the motor 21 runs under water, as the equipment where the motor 21 runs forward, the resistance of water encountered by the motor 21 may change), the actual rotation speed of the motor 21 may not be consistent with the set rotation speed, so the real-time rotation speed voltage signal of the motor 21 is obtained by the speed stabilizing control circuit, and the starting circuit adjusts the current output power according to the set rotation speed voltage signal and the real-time rotation speed voltage signal. In some embodiments, the motor 21 rotational speed control determines the output power of the motor 21 via a starting circuit to start the motor 21. In some embodiments, the startup circuit is electrically connected to the startup control circuit and the steady speed control circuit, respectively, so as to obtain a set rotational speed voltage signal and a real-time rotational speed voltage signal, and adjust the current output power according to the set rotational speed voltage signal and the real-time rotational speed voltage signal.
In some embodiments, the motor 21 includes a hall sensor 22, the starting circuit includes a hall signal processing circuit 15, the hall sensor 22 is electrically connected with the hall signal processing circuit 15, the hall signal processing circuit 15 is respectively electrically connected with the starting control circuit and the control module 13, and the starting control circuit obtains a set direction polarity signal and a set rotating speed voltage signal. In some embodiments, the motor 21 comprises a dc brushless motor 21, said motor 21 comprising a hall sensor 22, the hall signal being acquired by the hall sensor 22. The starting circuit comprises a Hall signal processing circuit 15, and a Hall sensor 22 of the motor 21 is electrically connected with a Hall signal processing module of the starting circuit, so that the Hall sensor 22 transmits collected Hall signals to the Hall signal processing module. The hall signal processing circuit 15 is also electrically connected with the start control circuit and the control module 13 respectively. In some embodiments, the set direction polarity signal and the set rotation speed voltage signal set by the user are acquired through a start control circuit.
In some embodiments, the start-up control circuit comprises a sample holder 31, the sample holder 31 is provided with a sample-and-hold switch 32, the sample holder 31 is electrically connected to the hall signal processing circuit 15, the polarity signal in the set direction is transmitted to the hall signal processing circuit 15 through the sample holder 31, the sample-and-hold circuit is electrically connected to the pulse width modulation circuit 11, and the voltage signal in the set rotational speed is transmitted to the pulse width modulation circuit 11 through the sample holder 31. Here, it will be appreciated by those skilled in the art that the sample holder 31 may perform sample holding and sample releasing of the electrical signal. For example, in the sample release state, based on the adjustment by the user, the sample holder 31 acquires the current set direction polarity signal and the set rotation speed voltage signal in real time; in the sample-and-hold state, even if the user adjusts the set direction polarity signal and the set rotation speed voltage signal, the set direction polarity signal and the set rotation speed voltage signal acquired in the sample holder 31 do not change. In some embodiments, the switching of sample hold, sample release of sample holder 31 is controlled by sample hold switch 32. In some embodiments, the sample-and-hold device 31 is electrically connected to the hall signal processing circuit 15 and the pulse width modulation circuit 11, respectively, so that the sample-and-hold device 31 transmits a polarity signal of a set direction to the hall signal processing circuit 15 and a voltage signal of a set rotational speed to the pulse width modulation circuit 11.
In some embodiments, the start control circuit further includes a slide bar potentiometer 33 and an absolute value transformer 34, and the slide bar potentiometer 33, the absolute value transformer 34, and the sample holder 31 are electrically connected in sequence, and the set direction polarity signal and the set rotation speed voltage signal are adjusted by the slide bar potentiometer 33. In some embodiments, the user may adjust the set direction polarity signal and the set rotational speed voltage signal via the slide bar potentiometer 33. For example, as shown in fig. 1, when the slide bar moves in the positive direction of the voltage, the motor 21 rotates forward, when the slide bar moves in the negative direction, the motor 21 rotates backward, and when the slide bar is positioned between the positive and negative electrodes, the motor 21 stops rotating. Of course, it will be understood by those skilled in the art that the above-mentioned effects of the movement of the slide rod in the positive and negative directions on the forward and reverse rotation of the motor 21 are merely examples, and other existing or future possible situations can be applied to the present embodiment, and the present application is also within the scope of the present application and is incorporated herein by reference. For example, when the slide bar moves toward the negative voltage pole, the motor 21 rotates forward. In some embodiments, the magnitude of the set rotation speed voltage signal can also be controlled by moving the slide bar potentiometer 33, so as to control the speed of the motor 21. In some embodiments, the set direction polarity signal, the set rotational speed voltage signal, is changed by the slide bar potentiometer 33. The absolute value converter 34 acquires the set direction polarity signal and the set rotation speed voltage signal, transmits the set direction polarity signal and the set rotation speed voltage signal to the sample holder 31, and the sample holder 31 performs sample holding or sample releasing of the set direction polarity signal and the set rotation speed voltage signal.
In some embodiments, the speed stabilizing control circuit includes a pulse frequency sampling circuit 41 and a voltage conversion circuit 42, the pulse frequency sampling circuit 41 is electrically connected with the voltage conversion circuit 42, the voltage conversion circuit 42 is electrically connected with the pulse width modulation circuit 11, and the pulse frequency sampling circuit 41 is connected with the three phase line. In some embodiments, the pulse frequency sampling circuit 41 collects and acquires a real-time pulse frequency signal, and transmits the real-time pulse frequency signal to the voltage conversion circuit 42, and the voltage conversion circuit 42 converts the real-time pulse frequency signal to a corresponding real-time rotational speed voltage signal, so that the voltage conversion circuit 42 transmits the real-time rotational speed voltage signal to the pulse width modulation circuit 11, so that the pulse width modulation circuit 11 converts the real-time rotational speed voltage signal to a corresponding real-time rotational speed pulse width signal. In this embodiment, during the operation of the motor 21, the real-time pulse frequency signal is collected, the real-time pulse frequency signal is converted into the real-time rotational speed voltage signal, the real-time rotational speed voltage signal is converted into the real-time rotational speed pulse width signal, and the real-time rotational speed pulse width signal is used to reflect the current real-time rotational speed of the motor 21, so that the current rotational speed of the motor 21 is detected to be smaller than the set rotational speed or larger than the set rotational speed by comparing the real-time rotational speed pulse width signal with the set rotational speed pulse width signal set by the user, so that when the current rotational speed of the motor 21 is smaller than the set rotational speed, the rotational speed of the motor 21 is increased by increasing the output power, and when the current rotational speed of the motor 21 is larger than the set rotational speed, the rotational speed of the motor 21 is reduced by reducing the output power, thereby achieving the steady technical effect.
In some embodiments, the starting circuit further includes a driving circuit 14, and the driving circuit 14 is electrically connected to the power output circuit 12 and the control module 13, respectively. Here, it is understood by those skilled in the art that the driving circuit 14 is required to realize control of the motor 21 based on the operation direction and the operation speed instruction information output from the control module 13 during the operation of the driving motor 21. A current corresponding to the current direction is output to the motor 21 through the power output circuit 12.
In some embodiments, the system further comprises a current sensor 51, the current sensor 51 is electrically connected to the power output circuit 12 and the pulse width modulation circuit 11, the real-time voltage value of the power output circuit 12 is monitored by the current sensor 51 so as to be transmitted to the pulse width modulation circuit 11, the real-time voltage value is converted into a real-time voltage pulse width signal by the pulse width modulation circuit 11, and the control module 13 is further configured to: when the real-time voltage pulse width signal meets the shutdown condition, sending a shutdown instruction to the driving circuit 14 to shut down the motor 21; when the real-time voltage pulse width signal reaches the maximum pulse width threshold, instruction information for reducing the output power is sent to the drive circuit 14. In some embodiments, the motor 21 rotational speed control device needs to monitor the safety of the motor 21 while controlling the motor 21 to run at a steady speed. For example, when the motor 21 is operated underwater, it may be entangled by sundries such as water plants and cannot be operated at a set rotational speed, and at this time, the real-time rotational speed voltage signal collected by the steady speed control circuit may be smaller than the set rotational speed voltage signal, and if the control module 13 increases the output power to attempt to achieve matching of the real-time rotational speed pulse width signal and the set rotational speed pulse width signal, the motor 21 may be damaged. The present embodiment realizes monitoring of the safety state of the motor 21 by providing the current sensor 51. The current sensor 51 is electrically connected to the power output circuit 12 and the pulse width modulation circuit 11, respectively, and the current sensor 51 transmits the acquired real-time voltage value of the power output circuit 12 to the pulse width modulation circuit 11, converts the real-time voltage value into a real-time voltage pulse width signal through the pulse width modulation circuit 11, and transmits the real-time voltage pulse width signal to the control module 13. The control module 13 performs a safety intervention on the operation of the motor 21 based on the real-time voltage pulse width signal. For example, when the real-time voltage pulse width signal acquired by the current sensor 51 satisfies the shutdown condition, a shutdown instruction is sent to the drive circuit 14 to shut down the motor 21. In other embodiments, when the real-time voltage pulse width signal reaches the maximum pulse width threshold, a command to reduce the output power is sent to the drive circuit 14 to avoid damaging the motor 21 due to excessive power.
In some embodiments, the shutdown condition includes at least any one of:
(1) The real-time voltage pulse width signal is greater than the maximum pulse width threshold. For example, when the real-time voltage pulse width signal is equal to the maximum pulse width threshold value, instruction information to decrease the output power is sent to the drive circuit 14 to decrease the rotation speed of the motor 21. When the real-time voltage pulse width signal is greater than the maximum pulse width threshold, at this point, indicating that the motor 21 has failed, the motor 21 should be turned off to protect the motor 21.
(2) The real-time voltage pulse width signal is in the target pulse width interval, and the real-time rotating speed pulse width signal is equal to or larger than the maximum rotating speed pulse width signal. For example, the control module 13 presets a target pulse width interval in which the current of the power output circuit 12 does not damage the motor 21. However, in the case of normal output power, accidents may still occur. For example, at normal output power, the motor 21 may idle. At this time, the real-time voltage pulse width signal is within the target pulse width interval, but the real-time rotational speed pulse width signal is equal to or greater than the maximum rotational speed pulse width signal, and in order to avoid damaging the motor 21, it is necessary to shut down the motor 21 at this time.
(3) The real-time voltage pulse width signal is in the target pulse width interval, and the real-time rotating speed pulse width signal is equal to or smaller than the minimum rotating speed pulse width signal. For example, the control module 13 presets a target pulse width interval in which the current of the power output circuit 12 does not damage the motor 21. However, in the case of normal output power, accidents may still occur. For example, in an underwater environment, if the motor 21 is entangled by debris such as weeds, the motor 21 may be stopped, and at this time, the real-time voltage pulse width signal is within the target pulse width interval, but the real-time rotational speed pulse width signal may be equal to or smaller than the minimum rotational speed pulse width signal. At this time, it is necessary to control the motor 21 to be stopped, so as to avoid the motor 21 from being damaged.
Of course, those skilled in the art will appreciate that the above-described shutdown conditions are merely examples, and that other shutdown conditions that may occur in the present or future are applicable to the present application and are within the scope of the present application and are incorporated herein by reference.
In some embodiments, a power source is further included and is electrically connected to the motor 21, the start circuit, the start control circuit, and the steady speed control circuit, respectively. In some embodiments, the motor 21, the start-up circuit, the start-up control circuit, the steady-speed control circuit are powered by a power supply. The power supply includes positive and negative voltage power supplies to realize regulation and control of forward rotation and reverse rotation of the motor 21.
In some embodiments, the power source includes an external power source 62 and an internal power source 61, where the internal power source 61 is electrically connected to the motor 21, the start circuit, the start control circuit, and the steady speed control circuit, respectively, and the external power source 62 is electrically connected to the internal power source 61 through a power switch 63. In some embodiments, as shown in FIG. 1, the internal power source 61 and the external power source 62 are electrically connected by a power switch 63. The motor 21, the start circuit, the start control circuit, and the steady speed control circuit are supplied with power by the internal power supply 61. The internal power supply 61 includes positive and negative voltage power supplies to realize regulation and control of the forward rotation and reverse rotation of the motor 21.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (8)
1. The motor rotating speed control device is characterized by comprising a starting control circuit, a starting circuit, a speed stabilizing control circuit and a motor, wherein the starting circuit comprises a pulse width modulation circuit and a power output circuit, the starting circuit is respectively and electrically connected with the starting control circuit and the speed stabilizing control circuit through the pulse width modulation circuit, and a set rotating speed voltage signal is obtained through the starting control circuit;
The starting circuit is electrically connected with the motor through three phase lines, the speed stabilizing control circuit is electrically connected with the three phase lines, the real-time rotating speed voltage signal of the motor is obtained through the speed stabilizing control circuit, the real-time rotating speed voltage signal is converted into a real-time rotating speed pulse width signal through the pulse width modulation circuit, and the set rotating speed voltage signal is converted into a set rotating speed pulse width signal;
the starting circuit further comprises a control module electrically connected with the pulse width modulation circuit, wherein the control module is used for: the current output power is adjusted according to the set rotating speed pulse width signal and the real-time rotating speed pulse width signal, so that the real-time rotating speed pulse width signal is matched with the set rotating speed pulse width signal;
the starting circuit further comprises a driving circuit which is electrically connected with the power output circuit and the control module respectively; the motor rotating speed control device further comprises a current sensor, wherein the current sensor is respectively and electrically connected with the power output circuit and the pulse width modulation circuit, the current sensor is used for monitoring the real-time voltage value of the power output circuit so as to transmit the real-time voltage value to the pulse width modulation circuit, and the pulse width modulation circuit is used for converting the real-time voltage value into a real-time voltage pulse width signal;
the control module is further configured to: when the real-time voltage pulse width signal meets a shutdown condition, sending a shutdown instruction to the driving circuit to shut down the motor; and when the real-time voltage pulse width signal reaches a maximum pulse width threshold value, sending instruction information for reducing output power to the driving circuit.
2. The motor rotation speed control device according to claim 1, wherein the motor comprises a hall sensor, the starting circuit comprises a hall signal processing circuit, the hall sensor is electrically connected with the hall signal processing circuit, the hall signal processing circuit is electrically connected with the starting control circuit and the control module respectively, and the starting control circuit is used for acquiring a set direction polarity signal and a set rotation speed voltage signal.
3. The motor rotation speed control device according to claim 2, wherein the start control circuit includes a sample holder provided with a sample-and-hold switch, the sample holder being electrically connected to the hall signal processing circuit, the set-direction polarity signal being transmitted to the hall signal processing circuit through the sample holder, the sample holder being electrically connected to the pulse width modulation circuit, the set-rotation speed voltage signal being transmitted to the pulse width modulation circuit through the sample holder.
4. The motor speed control device according to claim 3, wherein the start control circuit further comprises a slide bar potentiometer, an absolute value converter, and the slide bar potentiometer, the absolute value converter, and the sample holder are electrically connected in this order, and the set direction polarity signal and the set speed voltage signal are adjusted by the slide bar potentiometer.
5. The motor speed control device according to claim 1, wherein the steady speed control circuit includes a pulse frequency sampling circuit electrically connected to the voltage conversion circuit, a voltage conversion circuit electrically connected to the pulse width modulation circuit, and the pulse frequency sampling circuit connected to the three-phase line.
6. The motor speed control device according to claim 1, wherein the stop condition includes at least any one of:
The real-time voltage pulse width signal is greater than the maximum pulse width threshold;
the real-time voltage pulse width signal is in a target pulse width interval, and the real-time rotating speed pulse width signal is equal to or larger than the maximum rotating speed pulse width signal;
The real-time voltage pulse width signal is in the target pulse width interval, and the real-time rotating speed pulse width signal is equal to or smaller than the minimum rotating speed pulse width signal.
7. The motor speed control device of claim 1 further comprising a power source electrically connected to the motor, the start circuit, the start control circuit, and the steady speed control circuit, respectively.
8. The motor speed control device of claim 7 wherein the power source comprises an external power source and an internal power source, the internal power source is electrically connected to the motor, the starting circuit, the starting control circuit, and the speed stabilizing control circuit, respectively, and the external power source is electrically connected to the internal power source through a power switch.
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| CN202310891334.1A CN116937503B (en) | 2023-07-20 | 2023-07-20 | Motor rotation speed control device |
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| CN202310891334.1A CN116937503B (en) | 2023-07-20 | 2023-07-20 | Motor rotation speed control device |
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| CN116937503B true CN116937503B (en) | 2024-05-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674041A (en) * | 2009-10-26 | 2010-03-17 | 东莞市南星电子有限公司 | Controller of brushless direct-current motor |
| CN105846732A (en) * | 2016-05-27 | 2016-08-10 | 上海路虹电子科技有限公司 | Control circuit |
| CN109861591A (en) * | 2019-02-25 | 2019-06-07 | 东北大学 | The low-loss high-power pure square wave control device for brushless direct current machine of one kind and method |
| CN210518150U (en) * | 2019-11-15 | 2020-05-12 | 浙江理工大学 | Speed regulating system of direct current motor |
| CN211266819U (en) * | 2019-12-31 | 2020-08-14 | 南京安跑自动化设备有限公司 | Motor rotation speed controller |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220385223A1 (en) * | 2021-05-25 | 2022-12-01 | Global Mixed-Mode Technology Inc. | Motor controller |
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- 2023-07-20 CN CN202310891334.1A patent/CN116937503B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674041A (en) * | 2009-10-26 | 2010-03-17 | 东莞市南星电子有限公司 | Controller of brushless direct-current motor |
| CN105846732A (en) * | 2016-05-27 | 2016-08-10 | 上海路虹电子科技有限公司 | Control circuit |
| CN109861591A (en) * | 2019-02-25 | 2019-06-07 | 东北大学 | The low-loss high-power pure square wave control device for brushless direct current machine of one kind and method |
| CN210518150U (en) * | 2019-11-15 | 2020-05-12 | 浙江理工大学 | Speed regulating system of direct current motor |
| CN211266819U (en) * | 2019-12-31 | 2020-08-14 | 南京安跑自动化设备有限公司 | Motor rotation speed controller |
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| Publication number | Publication date |
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| CN116937503A (en) | 2023-10-24 |
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