CN201947218U - Single-phase induction motor speed regulation control system - Google Patents
Single-phase induction motor speed regulation control system Download PDFInfo
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- CN201947218U CN201947218U CN2011200944467U CN201120094446U CN201947218U CN 201947218 U CN201947218 U CN 201947218U CN 2011200944467 U CN2011200944467 U CN 2011200944467U CN 201120094446 U CN201120094446 U CN 201120094446U CN 201947218 U CN201947218 U CN 201947218U
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Abstract
The utility model relates to a single-phase induction motor speed regulation control system, which comprises one or a plurality of pulse-width modulation (PWM) rectifying circuits, a plurality of inverter circuits, control circuits, a voltage detection circuit, a current detection circuit, a rotating speed detection circuit and speed regulation switches, wherein the PWM rectifying circuits are used for outputting direct current to a direct current bus, the inverter circuits are connected with the direct current bus, the control circuits, the voltage detection circuit, the current detection circuit, the rotating speed detection circuit and the speed regulation switches are respectively connected with the inverter circuits, the bus uses one or a plurality of PWM rectifying circuits for providing direct current power supply, the input end of the rectifying circuit is connected with a three-phase alternating current power supply, the output end of the rectifying circuit is connected in parallel with the input ends of the inverter circuits through a positive direct current bus and a negative direct current bus, the control circuits correspond to each inverter circuit one by one, and the control circuits are connected with each speed regulation switch in a one-to-one correspondence way. The single-phase induction motor speed regulation control system has a high power factor and little current impact, can effectively utilize the brake energy of a single-phase induction motor and is used for a plurality of single-phase motor driving systems which are frequently started and stopped or need speed regulation control.
Description
Technical field
The utility model relates to a kind of single phase induction motor speed-adjusting and control system, and this single phase induction motor speed-adjusting and control system is used for frequent start-stop or needs a plurality of motor-driven application scenario of speed regulating control, is specially adapted to the driven by power of factory industry sewing machine.
Background technology
Single phase induction motor is used in various industry and civilian occasion widely at present, for example, and industrial sewing machinery, aircondition, ventilation blower, water pump, electric tool.Use mechanical movement to be example with present clothing factory, the quantity of sewing machine is very many in the clothing factory, following problem can occur in the process of using:
To not having the single phase induction motor of starting control, when being in frequent start-stop operating state, there is rush of current in the process of starting.Rush of current can make that immediate current is excessive in the motor, causes caloric value very big, has surpassed the caloric value of operate as normal greatly, makes ageing of insulation easily, causes insulation damages when serious and cause short circuit accident.Simultaneously, starting current impacts to electrical network, and a large amount of motors start simultaneously, cause electric voltage dropping, influence the normal operation of other power consumption equipment of same electrical network.
For not with the single phase induction motor of speed regulating control, when long-time light running, power factor reduces.Bigger reactive power causes the loss of electrical network energy.
At present, such as the sewing machine application scenario, still exist and adopt the mechanical clutch mode to control starting of work machinery and the mode that stops, this mode makes single phase induction motor often be in the no-load running state, causes the power factor of system on the low side.
Summary of the invention
The purpose of this utility model is to overcome the defective of prior art, provides a kind of power factor height, rush of current little, can effectively utilize the single phase induction motor braking energy, is used for frequent start-stop or needs a plurality of single phase induction motor drive systems of speed regulating control.
For achieving the above object, the utility model adopts a kind of single phase induction motor speed-adjusting and control system, and this system comprises one or more PWM rectification circuits, a plurality of inverter circuits, a plurality of control circuits, a plurality of voltage detecting circuits, a plurality of current detection circuits, a plurality of speed detect circuits and speed-regulating switch; The PWM rectification circuit is transported to direct current on the dc bus, inverter circuit is connected in parallel on the dc bus, each inverter circuit all is electrically connected with single phase induction motor, the controlled circuit control of inverter circuit, one end of control circuit links to each other with speed-regulating switch, the other end is electrically connected with voltage detecting circuit, current detection circuit and speed detect circuit respectively, and voltage detecting circuit, current detection circuit and speed detect circuit all detect voltage, electric current and the rotor speed at single phase induction motor two ends.
By adopting such scheme to realize a kind of a plurality of single phase induction motor speed-adjusting and control systems that link to each other with dc bus, this system can pass through rectification circuit, control circuit and inverter circuit, and testing circuit is realized the speed regulating control of single phase induction motor.
The utility model is further improved, and described PWM rectification circuit input end is connected with three-phase alternating-current supply, and output is in parallel with the input of described inverter circuit by positive direct-current bus and negative dc bus; The PWM rectification circuit provides DC power supply for dc bus, and is the inverter circuit power supply.
By adopting such scheme, described inverter circuit links to each other with the winding of single phase induction motor, and the control of controlled circuit, and control circuit links to each other with each speed-regulating switch, corresponding one by one each inverter circuit of control.
The utility model is further improved, described speed-regulating switch be each other independently, non-interfering, realize controlled function respectively.
By adopting such scheme, each is provided by the PWM rectification circuit in the described single phase induction motor speed-adjusting and control system four inverter circuits on the galvanic bus, four control circuits, four voltage detecting circuits, four current detection circuits and four speed-regulating switchs; Dc bus four inverter circuits in parallel, each inverter circuit all is electrically connected with single phase induction motor, the controlled circuit control of inverter circuit, one end of control circuit links to each other with speed-regulating switch, the other end is electrically connected with voltage detecting circuit, current detection circuit and speed detect circuit respectively, and voltage detecting circuit, current detection circuit and speed detect circuit all detect voltage, electric current and the rotor speed at single phase induction motor two ends.
The utility model is compared with the single phase induction motor speed-adjusting and control system that adopts at present, has the following advantages:
The first, power factor height: adopt the PWM rectification circuit can overcome the big shortcoming of Harmonics of Input that occurs in traditional thyristor commutating phase circuit and the diode rectifier circuit.The PWM rectification circuit can make input current near sinusoidal wave, with the input voltage same-phase, reaches unity power factor;
The second, rush of current is little: by the soft start of inverter circuit control single phase induction motor, reduced the single phase induction motor cranking current pulse.Moreover, adopt dc bus that single phase induction motor is powered, the impulse current of the random start of single phase induction motor when stopping can carrying out the energy complement buffering in the dc bus side, and be little to the rush of current of AC network.Overcome when single phase induction motor is independently controlled current impact to AC network.
The 3rd, saves energy: (1) is by the soft start of inverter circuit control single phase induction motor, and according to the motor load situation, the situation of control single phase induction motor is regulated rotating speed of motor, can improve the electric energy utilization rate.Overcome the shortcoming of the energy loss that adopts mechanical clutch Control work machinery; (2) mechanical energy during the single phase induction motor stopping brake is fed back to DC side by separately inverter circuit, is utilized by other inverter circuit of same dc bus; When most of inverter circuit of same dc bus during all to the DC side feedback electric energy, this energy feedback makes DC bus-bar voltage raise, and the PWM rectification circuit feeds back to AC network with the DC side energy.Thisly carry out the energy exchange utilization, and, overcome the energy consumption that traditional employing brake resistance method causes the characteristics of braking energy feedback AC network in DC side.
The 4th, reduce the governing system cost: the rectification circuit of high-performance single-phase induction alignment circuit adopts the power factor correction link usually, drive the application scenario at single phase induction motor, the speed-regulating control circuit of all induction machines all carries out power factor correction separately, increases the cost of control system.The utility model adopts the PWM rectification circuit incoming transport electrical network of concentrating, and to the single phase induction motor power supply, has both improved the power factor of system, also reduces system cost.
Description of drawings
Fig. 1 is a kind of example structure schematic diagram of the utility model.
Embodiment
As Fig. 1 is a kind of embodiment of this utility model, and for convenience of explanation, present embodiment has provided 5, four voltage detecting circuits of 6, four control circuits of 1, four inverter circuit of a PWM rectification circuit 4, four current detection circuits 9 and four speed-regulating switchs 3.
Described PWM rectification circuit 1 input is connected with three-phase alternating-current supply, output is in parallel with the input of described inverter circuit 6 by positive direct-current bus 2 and negative dc bus 2, PWM rectification circuit 1 provides DC power supply for dc bus 2, is inverter circuit 6 power supplies simultaneously.
Described inverter circuit 6 links to each other with the winding of single phase induction motor 8, and the control of controlled circuit 5, and its control circuit 5 all links to each other with each speed-regulating switch 3, corresponding one by one each inverter circuit 6 of control.
Described speed-regulating switch 3 be each other independently, non-interfering, realize controlled function respectively.
Each is provided by PWM rectification circuit 1 in the described single phase induction motor speed-adjusting and control system 4, four current detection circuits 9 of 5, four voltage detecting circuits of 6, four control circuits of four inverter circuits and four speed-regulating switchs 3 on the galvanic bus 2; Dc bus 2 four inverter circuits 6 in parallel, each inverter circuit 6 all is connected with single phase induction motor electricity 8, inverter circuit 6 controlled circuit 5 controls, one end of control circuit 5 links to each other with speed-regulating switch 3, the other end is electrically connected with voltage detecting circuit 4, current detection circuit 9 and speed detect circuit 7 respectively, and voltage detecting circuit 4, current detection circuit 9 and speed detect circuit 7 all detect voltage, electric current and the rotor speed at single phase induction motor 8 two ends.Except PWM rectifying part 1, the quantity of miscellaneous part can be decided according to the actual requirements.
The course of work of the present utility model is: PWM rectification circuit 1 is transformed into direct current with three-phase alternating current, output on positive direct-current bus 2 and the negative dc bus 2 (abbreviation dc bus), the voltage of dc bus 2 is stablized control by PWM rectification circuit 1, powers to inverter circuit 6 by dc bus 2; When speed-regulating switch 3 provides the voltage signal corresponding with rotating speed as speed command signal, control circuit 5 is according to the size of speed command signal, compare with detected single phase induction motor 8 rotor speed signals, send control signal to inverter circuit 6, make suitable voltage and the frequency of inverter circuit 6 outputs, the rotating speed that the rotor speed of single phase induction motor 8 reaches and stable operation is set in command signal.Simultaneously, control circuit 5 detects the winding voltage and the current signal of single phase induction motor 8, when overvoltage that occur to surpass amplitude setting threshold and duration setting threshold or overcurrent situations, control circuit 5 will stop the work of inverter circuit 6, and single phase induction motor 8 is out of service and send alarm.
The instruction that provides at speed-regulating switch 3 is for running slowly or from moving to when stopping, control circuit 6 and inverter circuit make single phase induction motor 8 be in brake running state, and the mechanical energy of single phase induction motor 8 converts electric energy to and feeds back to dc bus 2 sides; Under the situation that inverter circuit 6 moves simultaneously, feed back to the electric energy of DC side by the single phase induction motor 8 of one or several on-position, can be in by other and quicken or the single phase induction motor 8 of motor-operated running state utilize.If the most of or whole single phase induction motors 8 of a certain moment by dc bus 2 power supplies all are in on-position, the electric energy that feeds back to DC side can cause the trend of DC voltage rising, PWM rectification circuit 1 will be operated in the active inversion state, and braking energy feedback is arrived AC network.
Claims (7)
1. single phase induction motor speed-adjusting and control system, it is characterized in that: described single phase induction motor speed-adjusting and control system comprises one or more PWM rectification circuits, a plurality of inverter circuits, a plurality of control circuits, a plurality of voltage detecting circuits, a plurality of current detection circuits, a plurality of speed detect circuits and speed-regulating switch; The PWM rectification circuit is transported to direct current on the dc bus, dc bus a plurality of inverter circuits in parallel, each inverter circuit all is electrically connected with single phase induction motor, the controlled circuit control of inverter circuit, one end of control circuit links to each other with speed-regulating switch, the other end is electrically connected with voltage detecting circuit, current detection circuit and speed detect circuit respectively, and voltage detecting circuit, current detection circuit and speed detect circuit all detect voltage, electric current and the rotor speed at single phase induction motor two ends.
2. single phase induction motor speed-adjusting and control system according to claim 1, it is characterized in that: described PWM rectification circuit input end is connected with three-phase alternating-current supply, output is in parallel with the input of described inverter circuit by positive direct-current bus and negative dc bus, the PWM rectification circuit provides DC power supply for dc bus, is the inverter circuit power supply simultaneously.
3. single phase induction motor speed-adjusting and control system according to claim 1 and 2, it is characterized in that: described inverter circuit links to each other with the winding of single phase induction motor, and the control of controlled circuit, control circuit links to each other with each speed-regulating switch, corresponding one by one each inverter circuit of control.
4. single phase induction motor speed-adjusting and control system according to claim 1 and 2 is characterized in that: described each speed-regulating switch be each other independently, non-interfering, realize controlled function respectively.
5. single phase induction motor speed-adjusting and control system according to claim 3 is characterized in that: described each speed-regulating switch be each other independently, non-interfering, realize controlled function respectively.
6. single phase induction motor speed-adjusting and control system according to claim 1 and 2, it is characterized in that: each provides four inverter circuits in parallel on the galvanic bus by the PWM rectification circuit in the described single phase induction motor speed-adjusting and control system, four inverter circuits are to there being four control circuits, four voltage detecting circuits, four current detection circuits and four speed-regulating switchs; Dc bus four inverter circuits in parallel, each inverter circuit all is electrically connected with single phase induction motor, the controlled circuit control of inverter circuit, one end of control circuit links to each other with speed-regulating switch, the other end is electrically connected with voltage detecting circuit, current detection circuit and speed detect circuit respectively, and voltage detecting circuit, current detection circuit and speed detect circuit all detect voltage, electric current and the rotor speed at single phase induction motor two ends.
7. single phase induction motor speed-adjusting and control system according to claim 3, it is characterized in that: each provides four inverter circuits in parallel on the galvanic bus by the PWM rectification circuit in the described single phase induction motor speed-adjusting and control system, four inverter circuits are to there being four control circuits, four voltage detecting circuits, four current detection circuits and four speed-regulating switchs; Dc bus four inverter circuits in parallel, each inverter circuit all is electrically connected with single phase induction motor, the controlled circuit control of inverter circuit, one end of control circuit links to each other with speed-regulating switch, the other end is electrically connected with voltage detecting circuit, current detection circuit and speed detect circuit respectively, and voltage detecting circuit, current detection circuit and speed detect circuit all detect voltage, electric current and the rotor speed at single phase induction motor two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200944467U CN201947218U (en) | 2011-03-26 | 2011-03-26 | Single-phase induction motor speed regulation control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200944467U CN201947218U (en) | 2011-03-26 | 2011-03-26 | Single-phase induction motor speed regulation control system |
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| CN201947218U true CN201947218U (en) | 2011-08-24 |
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| CN2011200944467U Expired - Fee Related CN201947218U (en) | 2011-03-26 | 2011-03-26 | Single-phase induction motor speed regulation control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185557A (en) * | 2011-03-26 | 2011-09-14 | 温州职业技术学院 | Speed regulation control system of single-phase induction motor |
| CN103259466A (en) * | 2013-04-25 | 2013-08-21 | 北京山潜天恒科技有限公司 | Driving device for downhole belt conveyor |
-
2011
- 2011-03-26 CN CN2011200944467U patent/CN201947218U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185557A (en) * | 2011-03-26 | 2011-09-14 | 温州职业技术学院 | Speed regulation control system of single-phase induction motor |
| CN103259466A (en) * | 2013-04-25 | 2013-08-21 | 北京山潜天恒科技有限公司 | Driving device for downhole belt conveyor |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20140326 |