CN201398173Y - Speed measurement control device for asynchronous motor - Google Patents
Speed measurement control device for asynchronous motor Download PDFInfo
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- CN201398173Y CN201398173Y CN2009200378471U CN200920037847U CN201398173Y CN 201398173 Y CN201398173 Y CN 201398173Y CN 2009200378471 U CN2009200378471 U CN 2009200378471U CN 200920037847 U CN200920037847 U CN 200920037847U CN 201398173 Y CN201398173 Y CN 201398173Y
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- asynchronous motor
- speed
- system controller
- signal
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Abstract
The utility model discloses a speed measurement control device for an asynchronous motor, which comprises a wiring cabinet. The wiring cabinet is internally provided with a system controller connectedwith a power converter; the power converter is directly connected with the three phase of the stator winding of the asynchronous motor, outputs three-phase low-frequency symmetrical AC voltage and exerts high-frequency exciting voltage on U-phase voltage; two current mutual inductors are respectively connected in series between the V phase and the W phase of the power converter and the stator winding of the asynchronous motor; the output ends of the two current mutual inductors are respectively connected with a signal subtracter; the output end of the signal subtracter is connected with a signal filter and the system controller in sequence; and by receiving the signal filtered by the signal filter, the system controller conducts real-time control over power converter according to the speed signal given device, thereby realizing the control over the rotary speed of the measured asynchronous motor. The speed measurement control device needs no speed transducer and has simple test method, high system reliability, quick response, good low-speed dynamic response characteristics and high speed control precision, thereby having promising application prospect.
Description
Technical field
The utility model relates to a kind of speed measurement of asynchronous motor control device, is particularly useful for the rotating speed of cage modle and wire wound asynchronous motor is detected and control.
Background technology
In high performance Vector Control for Asynchronous Motor system, the closed-loop control link of speed generally is absolutely necessary; Known speed measurement of asynchronous motor method has two kinds: a kind of is to adopt mechanical speed transducers such as photoelectric code disk, tachogenerator to carry out motor speed to detect, and the feedback tach signal, thereby obtain the speed measuring device based on velocity transducer of motor speed data; But there is installation question in the mechanical speed transducer, and has increased the maintenance workload of system.Second kind is to utilize physical quantitys such as detecting motor stator voltage, electric current to carry out the speed measuring device of velocity estimation with the Speedless sensor of replacement velocity transducer; Though this system has solved the problem that the mechanical speed transducer brings, and has reduced system cost, present velocity estimation method is strong to the dependence of the parameter of electric machine, and calculating and control ratio have the sensing system complexity, low-response, and the low speed dynamic response characteristic is poor.Therefore, be badly in need of reliability and the accuracy that a kind of good speed measurement method and control corresponding device improve the asynchronous machine drive control system.
Summary of the invention
The purpose of this utility model is the weak point that overcomes in the prior art, provides a kind of response speed fast, simple and reliable and speed measurement of asynchronous motor control device that precision is high.
Speed measurement of asynchronous motor control device of the present utility model, comprise the wiring cabinet, be provided with system controller in the wiring cabinet, the power inverter that links to each other with system controller, power inverter is connected with three-phase alternating current input power supply by mains switch, power inverter directly with the U of asynchronous motor stator winding mutually, V links to each other with W mutually, export three phase low frequency symmetrical alternating current voltage, and in the U phase voltage, apply a high frequency exciting voltage; Power inverter is connected with two current transformers respectively mutually and between the W phase with the V of asynchronous motor stator winding, the output of two current transformers is connected with the signal subtraction device respectively, the output of signal subtraction device and traffic filter and system controller are linked in sequence, and also are connected with rate signal setter and motor speed display on the system controller.
The beneficial effects of the utility model: utilize the mechanical structure of asynchronous machine itself and electromagnetic relationship wherein, on the asynchronous motor stator winding, apply a stable high frequency excitation signal, detect the current signal that stator winding V and W go up mutually by current transformer, through the computing of signal subtraction device, handle through traffic filter again, can obtain the tach signal of tested asynchronous motor, the speed feedback signal that system controller acceptance is transmitted from traffic filter, send control signal after itself and given signal compared, the control signal that power inverter sends according to system controller changes its output voltage, can realize accurate control fast to tested asynchronous machine rotating speed, be applicable to that the rotating speed to cage modle and wire wound asynchronous motor detects and control, compared with prior art, omit velocity transducer, strengthened the reliability of system, response is fast, the low speed dynamic response characteristic is good, and the velocity control accuracy height has a good application prospect.
Description of drawings
Fig. 1 is the control device structure chart that tests the speed of the present utility model
Fig. 2 is a speed measurement of asynchronous motor control device fundamental diagram of the present utility model.
Among the figure: 1, three-phase alternating current input power supply; 2, mains switch; 3, rate signal setter; 4, three-phase power converters; 5, system controller; 6, current transformer; 7, current transformer; 8, signal subtraction device; 9, traffic filter; 10, motor speed display; 11, stator winding; 12, asynchronous motor stator; 13, asynchronous motor rotor conductor; 14, asynchronous motor rotor; Wiring cabinet, A.
Embodiment
The utility model will be further described below in conjunction with the embodiment in the accompanying drawing:
Speed measurement of asynchronous motor control device of the present utility model, comprise wiring cabinet A, be provided with system controller 5 in the wiring cabinet A, the power inverter 4 that links to each other with system controller 5, power inverter 4 is connected with three-phase alternating current input power supply 1 by mains switch 2, power inverter 4 directly with the U of asynchronous motor stator winding 11 mutually, V links to each other with W mutually, by controller 5 power controlling converters 4 output three phase low frequency symmetrical alternating current voltages, power inverter 4 is in output three symmetrical low-frequency ac voltages, high frequency voltage of stack in the u phase voltage, power inverter 4 is connected with current transformer 6 respectively mutually and between the W phase with the V of asynchronous motor stator winding 11,7, by being connected the current transformer 6 on the three- phase power converters 4,7 detect the current signal that stator winding V and W go up mutually, two current transformers 6,7 output is connected with signal subtraction device 8 respectively, the output of signal subtraction device 8 and traffic filter 9 and system controller 5 are linked in sequence, system controller 5 adopts dsp controller, which is provided with motor speed display 10.System controller 5 detected two current signals are handled through traffic filter 9 through 8 computings of signal subtraction device again, can obtain the tach signal of tested asynchronous motor; This signal is delivered to system controller 5, system controller 5 is connected to signal subtraction device 8 by traffic filter 9, the speed feedback signal of system controller 5 by accepting to transmit from traffic filter 9 sends control signal after itself and signal from rate signal setter 3 compared; Power inverter 4 changes its output voltage according to the control signal that system controller 5 is sent, and can realize the accurate control to tested asynchronous machine rotating speed fast.
Claims (1)
1, a kind of speed measurement of asynchronous motor control device, it is characterized in that: it comprises wiring cabinet (A), be provided with system controller (5) in the wiring cabinet (A), the power inverter (4) that links to each other with system controller (5), power inverter (4) is connected with three-phase alternating current input power supply (1) by mains switch (2), power inverter (4) directly with the U of asynchronous motor stator winding (11) mutually, the V phase links to each other with W, output three phase low frequency symmetrical alternating current voltage, and in the U phase voltage, apply a high frequency exciting voltage; Power inverter (4) is connected with two current transformers (6,7) respectively mutually and between the W phase with the V of asynchronous motor stator winding (11), the output of two current transformers (6,7) is connected with signal subtraction device (8) respectively, the output of signal subtraction device (8) and traffic filter (9) and system controller (5) are linked in sequence, and also are connected with rate signal setter (3) and motor speed display (10) on the system controller (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200378471U CN201398173Y (en) | 2009-01-23 | 2009-01-23 | Speed measurement control device for asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200378471U CN201398173Y (en) | 2009-01-23 | 2009-01-23 | Speed measurement control device for asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201398173Y true CN201398173Y (en) | 2010-02-03 |
Family
ID=41620704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200378471U Expired - Fee Related CN201398173Y (en) | 2009-01-23 | 2009-01-23 | Speed measurement control device for asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201398173Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789747B (en) * | 2009-01-23 | 2011-12-07 | 中国矿业大学 | Control method for speed measurement of asynchronous motor and device therefor |
-
2009
- 2009-01-23 CN CN2009200378471U patent/CN201398173Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789747B (en) * | 2009-01-23 | 2011-12-07 | 中国矿业大学 | Control method for speed measurement of asynchronous motor and device therefor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100203 Termination date: 20120123 |