CN203387456U - Rotational speed control system of alternating-current induction motor - Google Patents
Rotational speed control system of alternating-current induction motor Download PDFInfo
- Publication number
- CN203387456U CN203387456U CN201320502331.6U CN201320502331U CN203387456U CN 203387456 U CN203387456 U CN 203387456U CN 201320502331 U CN201320502331 U CN 201320502331U CN 203387456 U CN203387456 U CN 203387456U
- Authority
- CN
- China
- Prior art keywords
- induction motor
- speed
- motor
- electrically connected
- rotational speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses a rotational speed control system of an alternating-current induction motor, and the system comprises a photoelectric rotational speed sensor, a frequency-doubling comparator, a speed regulation terminal, a motor controller, and a drive circuit. The photoelectric rotational speed sensor is disposed on the alternating-current induction motor. The frequency-doubling comparator is electrically connected with the photoelectric rotational speed sensor. The speed regulation terminal is electrically connected with the motor controller and the frequency-doubling comparator. The motor controller is electrically connected with the frequency-doubling comparator. The drive circuit is electrically connected with the alternating-current induction motor. The system provided by the utility model controls the rotational speed of the alternating-current induction motor through a closed loop speed-regulating structure which is composed of the photoelectric rotational speed sensor, the frequency-doubling comparator, the speed regulation terminal, the motor controller, and the drive circuit. The closed loop mode enables the regulation of the rotational speed of the motor to be smoother and more accurate, and guarantees effective regulation of the rotational speeds for various motor loads. Meanwhile, the system can give an alarm timely once motor rotation blockage happens, thereby protecting the motor from being burned down.
Description
Technical field
The utility model relates to the rotating speed control technology field of motor, relates in particular to a kind of AC induction motor revolution speed control system.
Background technology
Along with improving constantly of people's living standard, increasing business-use refrigrating system, comprise picture central air conditioning, refrigerator, freezer, comes into operation.But the cooling fan of conventional refrigeration evaporator can not take full advantage of the difference cooling of ambient temperature and evaporator self temperature, fan is also just selected operation between " full speed running " and " shutdown ", and energy utilization rate is low.People expect electric machine speed regulation thereupon; yet; the evaporator cools fan of the refrigerator used in the market is nearly all AC induction motor (ACIM); and the controlled speed governing of AC induction motor is accurate controlled unlike direct current machine; especially current thyristor speed control commonly used; at low speed segment; be subject to the impact of load to be difficult to realize that speed controls; and often there will be fan to shut down can't driven phenomenon; cause motor temperature to rise and evaporator is not cooled, finally cause the refrigerator fault.
The utility model content
The purpose of this utility model is to solve by a kind of AC induction motor revolution speed control system the problem that above background technology is partly mentioned.
For reaching this purpose, the utility model by the following technical solutions:
A kind of AC induction motor revolution speed control system, it comprises photoelectric sensor, times frequency comparison apparatus, speed governing terminal, electric machine controller and drive circuit;
Described photoelectric sensor is arranged on AC induction motor, for detecting in real time the rotary speed information of AC induction motor, exports to a times frequency comparison apparatus;
Described times of frequency comparison apparatus and photoelectric sensor are electrically connected, and for described rotary speed information and the required rotating speed of AC induction motor are compared, comparative result are exported to the speed governing terminal;
Described speed governing terminal and electric machine controller, times frequency comparison apparatus are electrically connected, and for according to described comparative result, judges whether stall of motor, if stall sends alarm signal, otherwise the output speed-regulating instruction, adjusting induction alternating current (AC) motor rotating speed;
Described electric machine controller is electrically connected with times frequency comparison apparatus, and for the treatment of described speed-regulating instruction, the output control signal is to drive circuit;
Described drive circuit and AC induction motor are electrically connected, for according to described control signal, by the rotational speed regulation of AC induction motor to required rotating speed.
Especially, described photoelectric sensor comprises photoelectric sensor and reflecting element, and wherein, described photoelectric sensor is fixed on the AC induction motor stator, and reflecting element is fixed on the AC induction motor rotor.
Especially, described reflecting element is selected reflective pad pasting.
Especially, described speed governing terminal is selected microcomputer.
The closed-loop drive structure that the AC induction motor revolution speed control system that the utility model provides forms by photoelectric sensor, times frequency comparison apparatus, speed governing terminal, electric machine controller and drive circuit, control the rotating speed of AC induction motor, this closed-loop fashion makes the motor speed adjustment more steadily and is accurate, assurance all can provide effective rotating speed to control to different motor loads, simultaneously, once motor rotation blockage can reach alarm, thereby avoid burn-down of electric motor.
The accompanying drawing explanation
The AC induction motor revolution speed control system structure chart that Fig. 1 provides for the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the utility model, but not to restriction of the present utility model.It also should be noted that, for convenience of description, only show the part relevant to the utility model in accompanying drawing but not full content.
Please refer to shown in Fig. 1 the AC induction motor revolution speed control system structure chart that Fig. 1 provides for the utility model embodiment.
In the present embodiment, the AC induction motor revolution speed control system comprises photoelectric sensor 101, times frequency comparison apparatus 102, speed governing terminal 103, electric machine controller 104 and drive circuit 105.
Described photoelectric sensor 101 is arranged on AC induction motor 106, for detecting in real time the rotary speed information of AC induction motor 106, exports to times frequency comparison apparatus 102.
In the present embodiment, described photoelectric sensor 101 comprises photoelectric sensor and reflecting element, and wherein, described photoelectric sensor is fixed on AC induction motor 106 stators, and described reflecting element is selected reflecting plate, is fixed on AC induction motor 106 rotors.Photoelectric sensor comprises photophore, light receiving device and attached treatment circuit.Utilize the photoelectric emission principle, the light that photophore sends is reflected by reflective pad pasting, is received by light receiving device, then processes through accessory circuit the rotary speed information that obtains AC induction motor 106.
Described times of frequency comparison apparatus 102 is electrically connected with photoelectric sensor 101, for described rotary speed information and the required rotating speed of AC induction motor 106 are compared, comparative result exported to speed governing terminal 103.
Described speed governing terminal 103 is electrically connected with electric machine controller 104, times frequency comparison apparatus 102, for according to described comparative result, judge whether stall of motor, if stall sends alarm signal, otherwise the output speed-regulating instruction, adjusting induction alternating current (AC) motor rotating speed.
In the present embodiment, described speed governing terminal 103 is selected microcomputer.Microcomputer is a kind ofly to using microprocessor as the computer of its central processing unit, only occupies the little space on entity, as notebook computer, panel computer etc. all belongs to microcomputer.
Described electric machine controller 104 is electrically connected with times frequency comparison apparatus 102, and for the treatment of described speed-regulating instruction, the output control signal is to drive circuit 105.
Described drive circuit 105 is electrically connected with AC induction motor 106, for according to described control signal, by the rotational speed regulation of AC induction motor 106 to required rotating speed.The kind of drive circuit 105 is a lot, selects motor-drive circuit commonly used 105 in the present embodiment, does not repeat them here.
The AC induction motor revolution speed control system that the utility model provides is applied in refrigerating system, can make the cooling of evaporator realize tracking with the temperature (and then pressure of corresponding cold-producing medium) of refrigerating system inner refrigerant, thereby improve the efficiency of refrigerating system, for the computer control that realizes modern refrigerating system lays the foundation.
The closed-loop drive structure that the technical solution of the utility model forms by photoelectric sensor, times frequency comparison apparatus, speed governing terminal, electric machine controller and drive circuit, control the rotating speed of AC induction motor, this closed-loop fashion makes the motor speed adjustment more steadily and is accurate, assurance all can provide effective rotating speed to control to different motor loads, simultaneously, once motor rotation blockage can reach alarm, thereby avoid burn-down of electric motor.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Skilled person in the art will appreciate that the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not break away from protection range of the present utility model.Therefore, although by above embodiment, the utility model is described in further detail, but the utility model is not limited only to above embodiment, in the situation that do not break away from the utility model design, can also comprise more other equivalent embodiment, and scope of the present utility model is determined by appended claim scope.
Claims (4)
1. an AC induction motor revolution speed control system, is characterized in that, comprises photoelectric sensor, times frequency comparison apparatus, speed governing terminal, electric machine controller and drive circuit;
Described photoelectric sensor is arranged on AC induction motor, for detecting in real time the rotary speed information of AC induction motor, exports to a times frequency comparison apparatus;
Described times of frequency comparison apparatus and photoelectric sensor are electrically connected, and for described rotary speed information and the required rotating speed of AC induction motor are compared, comparative result are exported to the speed governing terminal;
Described speed governing terminal and electric machine controller, times frequency comparison apparatus are electrically connected, and for according to described comparative result, judges whether stall of motor, if stall sends alarm signal, otherwise the output speed-regulating instruction, adjusting induction alternating current (AC) motor rotating speed;
Described electric machine controller is electrically connected with times frequency comparison apparatus, and for the treatment of described speed-regulating instruction, the output control signal is to drive circuit;
Described drive circuit and AC induction motor are electrically connected, for according to described control signal, by the rotational speed regulation of AC induction motor to required rotating speed.
2. AC induction motor revolution speed control system according to claim 1, it is characterized in that, described photoelectric sensor comprises photoelectric sensor and reflecting element, wherein, described photoelectric sensor is fixed on the AC induction motor stator, and described reflecting element is fixed on the AC induction motor rotor.
3. AC induction motor revolution speed control system according to claim 2, is characterized in that, described reflecting element is selected reflective pad pasting.
4. according to the described AC induction motor revolution speed control system of one of claims 1 to 3, it is characterized in that, described speed governing terminal is selected microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320502331.6U CN203387456U (en) | 2013-08-16 | 2013-08-16 | Rotational speed control system of alternating-current induction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320502331.6U CN203387456U (en) | 2013-08-16 | 2013-08-16 | Rotational speed control system of alternating-current induction motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203387456U true CN203387456U (en) | 2014-01-08 |
Family
ID=49875904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320502331.6U Expired - Fee Related CN203387456U (en) | 2013-08-16 | 2013-08-16 | Rotational speed control system of alternating-current induction motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203387456U (en) |
-
2013
- 2013-08-16 CN CN201320502331.6U patent/CN203387456U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20110083450A1 (en) | Refrigerant System With Stator Heater | |
| CN107588508B (en) | Variable frequency air conditioner without outdoor electric controller and control method | |
| US20160365817A1 (en) | Hvac components having a variable speed drive with optimized power factor correction | |
| CN103326664B (en) | Control device of electric motor and utilize its motor drive, compressor, refrigerating plant, air regulator and method of motor control | |
| CN101726135B (en) | Air-conditioning system with two working modes and control method thereof | |
| CN103326665A (en) | Motor driving device, air-conditioner possessing the motor driving device and motor driving method | |
| CN106575930A (en) | Method for braking a compressor and compressor of a refrigeration device, of an air conditioning device, or of a heat pump, and refrigeration device, air conditioning device, or heat pump having said compressor | |
| KR20140051827A (en) | Method for starting a single-phase induction motor, starting device for a single-phase motor and starting system therefor | |
| CN106705364B (en) | The control method and air conditioner of outdoor fan under air conditioner cryogenic refrigeration operating condition | |
| CN203387456U (en) | Rotational speed control system of alternating-current induction motor | |
| CN201420682Y (en) | Rare-earth permanent magnet brushless motor water pump system | |
| JPWO2016103678A1 (en) | Simple inverter control type refrigerator, inverter control unit for refrigerator, and inverter compressor using the same | |
| EP3160039B1 (en) | Systems and methods for controlling an electric motor | |
| CN218001674U (en) | Internal temperature control system of air conditioner external unit electrical box and air conditioner | |
| CN105317521B (en) | A kind of electric engine cooling fan multilevel control system | |
| CN102022861B (en) | Hybrid type variable frequency air conditioning system with two working modes and control method thereof | |
| CA2951319C (en) | Automatic speed regulating ecm motor and freezer using same | |
| JP2014234718A (en) | Control device for compressor and refrigerator | |
| JP2014057497A (en) | Inverter drive device and air conditioner using the same | |
| JP2012070530A (en) | Motor drive apparatus | |
| CN104393817A (en) | Motor driving method and device, air-conditioner and electric appliance | |
| JP2015040523A (en) | Motor compressor | |
| KR100848157B1 (en) | Controlling method of bldc motor and air conditioner useing the same of | |
| JP5618899B2 (en) | Motor control device and air conditioner | |
| CN202019334U (en) | Multi-mode motor drive circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140108 Termination date: 20150816 |
|
| EXPY | Termination of patent right or utility model |