CN201323545Y - Starting device for single-phase asynchronous motor - Google Patents
Starting device for single-phase asynchronous motor Download PDFInfo
- Publication number
- CN201323545Y CN201323545Y CNU2008202322813U CN200820232281U CN201323545Y CN 201323545 Y CN201323545 Y CN 201323545Y CN U2008202322813 U CNU2008202322813 U CN U2008202322813U CN 200820232281 U CN200820232281 U CN 200820232281U CN 201323545 Y CN201323545 Y CN 201323545Y
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- operational amplifier
- level comparison
- comparison circuit
- circuit
- switching device
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Abstract
The utility model relates to a starting protection device for a single-phase asynchronous motor. The starting device for the single-phase asynchronous motor takes controllable silicon as a starting switch and eliminates the technical problem that a mechanical contact starting switch is susceptible to electric arc damage. A controllable silicon control circuit comprises a switching device arranged in a controllable silicon control loop; a high level comparison circuit and a low level comparison circuit are connectedly arranged through taking starting capacitance voltage as detection signals; and a positive feedback bias circuit for ensuring that the switching device works in the on-off state is connectedly arranged at the control end of the switching device. The utility model has the advantages of high starting control sensibility and accuracy, reliable work and high stability.
Description
Technical field
The utility model relates to single-phase asynchronous motor and start protective device.
Background technology
As the protective device that single-phase asynchronous motor starts, at present control device that adopted on the basis of mechanical type start-up control switch additional electrical more.Mechanical type starts contact switch and bearing startup electric arc in opening and closing movement, causes switch motion malfunctioning if the contact is damaged, and then damages easily to start electric capacity or burn motor.
Summary of the invention
It is a kind of novel single-phase asynchronous motor starting drive that the starting switch parts design with contactless semiconductor device that goal of the invention of the present utility model is to provide a kind of.The disclosed single-phase asynchronous motor starting drive of the utility model technical scheme, its major technique content is: a kind of single-phase asynchronous motor starting drive, comprise controllable silicon and this SCR control circuit, controllable silicon major loop and the control branch road that starts capacitances in series formation auxiliary winding coil as starting switch; Its SCR control circuit comprises the switching device that is arranged at the SCR control loop, be connected with high level comparison circuit and low level comparison circuit to start capacitance terminal voltage as detection signal, the control end of described switching device is connected with and makes it work in the positive feedback biasing circuit of on off state.
The disclosed single-phase asynchronous motor starting drive of the utility model technical scheme, semiconductor device---controllable silicon is as starting switch in employing, especially be controlling and driving to work in control switch state of switch device in the regenerative circuit effect in its control loop, thereby have start-up control sensitivity and accuracy height, reliable operation and the high characteristics of stability.
Description of drawings
Fig. 1 circuit diagram that to be this single-phase asynchronous motor starting drive be connected with auxiliary winding coil, operation winding coil with electric motor starting electric capacity
Fig. 2 is the circuit theory diagrams of this single-phase asynchronous motor starting drive.
Embodiment
High level comparison circuit and low level comparison circuit are connected with reference voltage circuit.
Single-phase asynchronous motor starting drive of the present utility model comprises controllable silicon and control circuit thereof as starting switch.As shown in Figure 1, controllable silicon major loop tandem promoter capacitor C constitutes auxiliary winding coil L1 control branch road, is parallel to motor operation winding coil L2.The SCR control circuit comprises the switching device that is arranged at the SCR control loop, comprise that also the terminal voltage to start capacitor C connects high level comparison circuit and the low level comparison circuit that is provided with as detecting voltage, described high level starts the terminal voltage value of capacitor C when rising to a set point for the operation of rotor rotating speed, when being higher than this high level set point, the driving switch device disconnects controllable silicon Q, is worked independently by the operation coil; Described low level starts the terminal voltage value of capacitor C when dropping to a set point for the operation of rotor rotating speed, when being lower than this low level, the driving switch device makes controllable silicon Q conducting, then additional motor auxiliary winding coil L1 running work.In the present embodiment structure, that its switching device is selected for use is positive-negative-positive triode T1, and its base stage control end is connected with and makes it work in the positive feedback biasing circuit of on off state.Described level comparison circuit and positive feedback biasing circuit are by operational amplifier A 3, A4 and A1, A2 connects and composes, the power supply stabilization circuit output inserts the electrode input end of operational amplifier A 3 and the negative input of operational amplifier A 4, benchmark voltage is provided, the terminal voltage that starts capacitor C is connected to two operational amplifier A 3 respectively through unilateral diode D3, the negative input of A4, electrode input end, constitute low level comparison circuit and high level comparison circuit respectively, the output of two comparison circuits inserts operational amplifier A 1 respectively, the negative input of A2, the output of operational amplifier A 2 is through divider resistance and connect operational amplifier A 1 output, and the output of operational amplifier A 2 is fed to the negative input of operational amplifier A 1, constitute the base bias circuit of triode T1, make this triode T1 work on off state reliably.In order to realize the isolation of switch triode T1 and controllable silicon Q, in the SCR control loop, be provided with photocoupler.
The action implementation process of foregoing circuit is: place in circuit moment, switch triode T1 conducting, make the controllable silicon conducting by photocoupler, auxiliary winding coil L1 and operation winding coil L2 turn round jointly, when the motor working voltage raises when reaching its rotor speed and rising to 70-85%, when promptly starting capacitor C voltage V0 and reaching the 5V voltage of setting, the electrode input end voltage of operational amplifier A 4 is higher than its negative pole reference voltage, then to operational amplifier A 2 negative pole ends output high level, make operational amplifier A 2 output low levels, be fed to operational amplifier A 1 negative input simultaneously, impel switch triode T1 to disconnect, also impel controllable silicon Q to disconnect, by motor operation winding coil L2 isolated operation.Thereafter motor is in service, when if rotor speed is lower than 50% set point, when the terminal voltage V0 value of the startup capacitor C corresponding with it is lower than low level comparison circuit operational amplifier A 3 anodal reference voltages, operational amplifier A 3 is to operational amplifier A 1 negative input output high level, 1 couple of switch triode T1 of operational amplifier A base stage output low level, operational amplifier A 4 this moment output low level too, impel its diode D2 to end, make switch triode T1 upset conducting, make motor return to normal running status.
Claims (2)
1, a kind of single-phase asynchronous motor starting drive comprises controllable silicon (Q) and this SCR control circuit as starting switch, and the controllable silicon master goes the same way and starts the control branch road that capacitances in series constitutes the auxiliary winding coil; It is characterized in that the SCR control circuit comprises the switching device that is arranged at the SCR control loop, be connected with high level comparison circuit and low level comparison circuit to start electric capacity (C) terminal voltage as detection signal, the control end of described switching device is connected with and makes it work in the positive feedback biasing circuit of on off state.
2, single-phase asynchronous motor starting drive according to claim 1, it is characterized in that switching device is that switch triode (T1) level comparison circuit and positive feedback biasing circuit are by operational amplifier (A3, A4) and (A1, A2) connect and compose, the electrode input end of the operational amplifier (A3) of formation level comparison circuit and the negative input of operational amplifier (A4) insert benchmark voltage, the terminal voltage that starts electric capacity (C) is connected to two operational amplifier (A3 respectively through unilateral diode (D3), A4) negative input, electrode input end constitutes low level comparison circuit and high level comparison circuit respectively; The output of two level comparison circuit inserts the negative input of operational amplifier (A1, A2) respectively, the output of operational amplifier (A2) is through divider resistance and connect operational amplifier (A1) output, and the output of operational amplifier (A2) is fed to the negative input of operational amplifier (A1), constitutes the base bias circuit of triode (T1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202322813U CN201323545Y (en) | 2008-12-24 | 2008-12-24 | Starting device for single-phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202322813U CN201323545Y (en) | 2008-12-24 | 2008-12-24 | Starting device for single-phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201323545Y true CN201323545Y (en) | 2009-10-07 |
Family
ID=41160917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202322813U Expired - Fee Related CN201323545Y (en) | 2008-12-24 | 2008-12-24 | Starting device for single-phase asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201323545Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868821A (en) * | 2014-08-29 | 2015-08-26 | 广东美的环境电器制造有限公司 | Single-phase induction motor speed regulation device and speed regulation method |
| CN105048882A (en) * | 2015-08-20 | 2015-11-11 | 佛山市威灵洗涤电机制造有限公司 | Motor starting circuit, motor, and motor starting method |
-
2008
- 2008-12-24 CN CNU2008202322813U patent/CN201323545Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868821A (en) * | 2014-08-29 | 2015-08-26 | 广东美的环境电器制造有限公司 | Single-phase induction motor speed regulation device and speed regulation method |
| WO2016029764A1 (en) * | 2014-08-29 | 2016-03-03 | 广东美的环境电器制造有限公司 | Speed adjustment device and speed adjustment method for single-phase induction motor |
| CN104868821B (en) * | 2014-08-29 | 2018-04-03 | 广东美的环境电器制造有限公司 | The arrangements for speed regulation and speed regulating method of single phase induction motor |
| CN105048882A (en) * | 2015-08-20 | 2015-11-11 | 佛山市威灵洗涤电机制造有限公司 | Motor starting circuit, motor, and motor starting method |
| CN105048882B (en) * | 2015-08-20 | 2018-01-30 | 佛山市威灵洗涤电机制造有限公司 | The startup method of the start-up circuit of motor, motor and motor |
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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: 20091007 Termination date: 20141224 |
|
| EXPY | Termination of patent right or utility model |