CN101345463A - Single phase AC motor - Google Patents
Single phase AC motor Download PDFInfo
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- CN101345463A CN101345463A CNA2008101179649A CN200810117964A CN101345463A CN 101345463 A CN101345463 A CN 101345463A CN A2008101179649 A CNA2008101179649 A CN A2008101179649A CN 200810117964 A CN200810117964 A CN 200810117964A CN 101345463 A CN101345463 A CN 101345463A
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Abstract
The invention relates to a single-phase alternating current motor comprising a casing, a main winding and a subordinate winding arranged in the casing and a triad capacitance. The triad capacitance includes a control circuit, a running capacitance and a starting capacitance connected with the control circuit. The parallelly connected running capacitance and the starting capacitance are connected with the subordinate winding, the control circuit is used to control whether the starting capacitance accesses the circuit. The starting capacitance is accessed when the motor starts up by controlling the on and off of the running capacitance and the subordinate winding loop, thereby the motor quickly starts up and the characteristic of the motor is improved. Thus the mechanical centrifugal switch is saved, the length of the motor is shortened, raw materials are greatly saved, at the same time the amount of labor during the motor production assembly is reduced. The size and weight of the motor of the same power can be made less and more environment friendly in the whole power system containing the motor, which enables the whole power system more portable.
Description
Technical field
The present invention relates to electric motors, particularly relate to a kind of single-phase AC motor.
Background technology
Series of advantages such as single-phase AC motor is simple in structure because of having, and is with low cost, reliable, easy to maintenance have been widely used in the small-power driving of household electrical appliance and all trades and professions.During motor starting, stator must be set up a rotating magnetic field, so that rotor rotation, generally need on auxilliary winding, to insert an electric capacity and carry out phase shift, the electrical phase angle that makes the main and auxiliary winding after the energising is 90 degree, thereby can produce bigger starting torque, and rotor starting is turned round.The selection of condenser capacity is extremely important, if this capacitance is bigger than normal, electric motor starting moment is big, but behavior in service descends; If this electric capacity is less than normal, though the motor operation performance is good, but starting performance decline produces drawbacks such as temperature rising, noise increase, power consumption increase and rotating speed reduction in the time of can making motor work simultaneously.Therefore when motor starting, two electric capacity all insert auxilliary winding, obtain bigger starting torque, and after the starting, with the starting capacitance excision, motor obtains runnability preferably.As shown in Figure 1, traditional single phase capacitor motor be the centrifugal switch 1 control starting capacitance by a mechanical contact-type access whether because mechanical contact-type centrifugal switch volume is bigger, must strengthen the length of motor, increase raw-material consumption, it is complicated that structure also becomes.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can overcome above-mentioned defective, and can Fast starting, obtain bigger output torque, the better single-phase AC motor of motor characteristic.
For achieving the above object, technical scheme of the present invention provides a kind of single-phase AC motor, comprise casing, and be installed in main winding and auxilliary winding in the casing, it is characterized in that described single-phase AC motor also comprises: three-in-one electric capacity comprises control circuit and the running electric capacity and the starting capacitance that are connected with described control circuit, be connected with described auxilliary winding after described running electric capacity and the starting capacitance parallel connection, whether described control circuit is used to control described starting capacitance place in circuit.
Wherein, described three-in-one electric capacity is drawn A, B, three leads of C, lead A is drawn by the electromotive force reference point on the described control circuit, end with described main winding and auxilliary winding is connected respectively, lead B is drawn by an end of described running electric capacity, be connected with the other end of described auxilliary winding, lead C is drawn by the other end of described running electric capacity and an end of described starting capacitance, is connected with the other end of described main winding.
Wherein, described control circuit comprises control chip, bidirectional triode thyristor and inductance, described bidirectional triode thyristor and inductance are connected between described starting capacitance and the described lead B, and whether described control chip controls described starting capacitance place in circuit by the break-make of controlling described bidirectional triode thyristor.
Wherein, described control chip comprises: first control chip, second control chip, described second control chip generates control signal according to the variation of described auxilliary winding both end voltage, and described control signal sent to described first control chip, described first control chip is controlled the break-make of described bidirectional triode thyristor according to described control signal.
Wherein, described first control chip is a photoelectrical coupler, and second control chip is a voltage comparator.
Wherein, described control circuit also comprises: discharge resistance is connected in parallel on described starting capacitance two ends.
Wherein, described three-in-one electric capacity is installed in described casing outside.Technique scheme only is an optimal technical scheme of the present invention, has following advantage: the break-make in the loop by control starting capacitance and auxilliary winding composition, thereby when motor needs, insert starting capacitance, make the motor Fast starting, obtain bigger output torque, improve the characteristic of motor.After the starting, with the starting capacitance excision, motor obtains runnability preferably.And three-in-one electric capacity can be installed in the casing outside, is not subjected to the influence of the volume of motor own, and is very convenient.Save mechanical type and leave the pass, shortened the length of motor, saved raw material, the amount of labour when having reduced motor production assembling simultaneously.In the whole dynamical system that comprises motor, littler, energy-conserving and environment-protective more that the motor volume of equal-wattage, weight can be done make that whole dynamical system is lighter.
Description of drawings
Fig. 1 is the structural representation of the single-phase AC motor of prior art;
Fig. 2 is the connection diagram of a kind of single-phase AC motor of the embodiment of the invention
Fig. 3 is the electrical schematic diagram of control circuit of a kind of single-phase AC motor of the embodiment of the invention;
Fig. 4 is the structural representation of a kind of three and an electric capacity of the embodiment of the invention;
Fig. 5 is the internal structure schematic diagram of a kind of single-phase AC motor of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
During motor (hereinafter to be referred as motor) starting, stator must be set up a rotating magnetic field, so that rotor rotation, generally need on auxilliary winding, to insert an electric capacity and carry out phase shift, the electrical phase angle that makes the main and auxiliary winding after the energising is 90 degree, thereby can produce bigger starting torque, and rotor starting is turned round.In order to allow motor the time can both obtain preferable performance in starting and running, then can adopt after two electric capacity (having played electric capacity and the electric capacity that turns round) parallel connection again the mode of connection with auxilliary windings in series, this motor is called single-phase capacitance and starts and run motor.
As shown in Figure 2, the frame of broken lines that contains main winding W1 and auxilliary winding W2 is represented the winding part of motor, and the another one frame of broken lines is represented three-in-one capacitive part, and A, B, C represent three leads.On the basis of original single-phase AC motor, increase a three-in-one electric capacity (structure of three-in-one electric capacity as shown in Figure 4), this three-in-one electric capacity inside comprises a running capacitor C BB, a starting capacitance CD and a control circuit, running capacitor C BB is connected with described control circuit with starting capacitance CD, wherein, lead A is drawn by the electromotive force reference point on the control circuit, end with main winding W1 and auxilliary winding W2 is connected respectively, lead B is drawn by the end of running capacitor C BB, be connected with the other end of auxilliary winding W2, lead C is by the other end of running capacitor C BB, and the end of starting capacitance CD draws, and is connected with the other end of main winding W1.The electromotive force reference point typically refers to the low level on the control circuit, and promptly voltage is 0.Because three leads have definite annexation, for avoiding occurring connection error, A, B, three leads of C can adopt different colors to distinguish.Control circuit is used to control motor in when starting, starting capacitance CD with connect with auxilliary winding W2 after running capacitor C BB is in parallel, behind motor starting, control starting capacitance CD and open, not place in circuit in circuit interruption.
When electric motor starting, because being connected the back with auxilliary winding W2, uses running capacitor C BB, and the both end voltage of W2 is changing, and the variation of this voltage promptly can reflect the actual operating state of motor.The access that can determine starting capacitance CD by the situation that detects this voltage whether; Thereby make motor when needed, insert starting capacitance CD, increase the output torque of motor, improve the characteristic of motor.In order better to control effect, the control circuit of present embodiment also comprises the discharge resistance R10 in parallel with starting capacitance CD, starting capacitance CD discharge when being used for the disconnection of loop, starting capacitance CD place.In addition, also comprise the first chip U2, the second chip U1, bidirectional triode thyristor T1 and peripheral circuit, the detailed annexation of peripheral circuit is seen Fig. 3.Bidirectional triode thyristor and inductance are connected by starting capacitance CD with described, and the first control chip U2 controls the break-make in described loop by the break-make of control bidirectional triode thyristor T1.The more excellent control mode control signal that to be the second control chip U1 change the described auxilliary winding W2 both end voltage of correspondence sends to the described first control chip U2, and the break-make that the first control chip U2 controls described bidirectional triode thyristor T1 according to described control signal is controlled the break-make in described loop.
Below in conjunction with Fig. 3, describe the course of work in detail.When electric motor starting, the voltage at auxilliary winding W2 two ends is zero or the voltage on the main winding, the second control chip U1 detects the voltage at auxilliary winding W2 two ends by peripheral circuit, transmit control signal to the first control chip U2, after the first control chip U2 receives control signal, control controllable silicon T1 conducting, starting capacitance CD is with after running capacitor C BB is in parallel, be switched in the auxilliary winding W2 loop of motor, under the rotating magnetic field effect, rotor starts automatically.Because starting capacitance CD is with after running capacitor C BB is in parallel, voltage increases, and the increase of electric motor starting moment is so be beneficial to the starting of motor more.Behind the electric motor starting, the voltage at auxilliary winding W2 two ends rises, after treating that rotor speed is increased to the numerical value of design (as 70% or rated revolution of rated revolution), the second control chip U1 detects the change in voltage of two sections of auxilliary winding W2 by peripheral circuit, transmit control signal to the first control chip U2, after the first control chip U2 receives control signal, control controllable silicon T1 disconnects, promptly disconnect starting capacitance CD, starting capacitance CD is by discharge resistance R10 discharge, and running capacitor C BB and auxilliary winding W2 still are connected in the circuit after connecting, because auxilliary winding W2 still is connected in the circuit, thereby increased the output torque of motor, improved the behavior in service of motor.In addition, in motor operation course, if the second control chip U1 reduces by the voltage that peripheral circuit detects auxilliary winding W2 two ends, transmit control signal to the first control chip U2, after the first control chip U2 receives control signal, control controllable silicon T1 conducting, with in the starting capacitance CD place in circuit, make starting capacitance CD in parallel again, be switched in the auxilliary winding W2 loop of motor with running capacitor C BB, thereby improve the voltage at auxilliary winding W2 two ends, improve the behavior in service of motor.U1 in the present embodiment is that voltage comparator, U2 are photoelectrical coupler, but first control chip of the present invention, second control chip are not restricted to voltage comparator and photoelectrical coupler, all can as long as can realize the chip of above-mentioned controlled function.
The structure of three-in-one electric capacity inside will make the overall performance of motor change, and three-in-one electric capacity can be installed in the outside of motor case, like this, it before had been capacitor-operated motor, just become " capacitor start operated motor " after three-in-one electric capacity is installed, do simple modification on the basis of existing capacitor-operated motor, outward appearance does not have big variation, but performance has had large increase, is convenient to realize existing motor properties improvement.This system is equally applicable to power driven system at the beginning of designing and developing, and can save the resource of motor, finishes the application of capacitor start operated motor with the structure of capacitor-operated motor.In addition, as shown in Figure 5, contrast as can be known with Fig. 1, the motor of present embodiment saves mechanical type centrifugal switch 1, has shortened the length of motor, saves raw material in a large number, the amount of labour when having reduced motor production assembling simultaneously.In the whole dynamical system that comprises motor, littler, energy-conserving and environment-protective more that the motor volume of equal-wattage, weight can be done make that whole dynamical system is lighter.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1, a kind of single-phase AC motor comprises casing, and is installed in main winding and auxilliary winding in the casing, it is characterized in that described single-phase AC motor also comprises:
Three-in-one electric capacity comprises control circuit and the running electric capacity and the starting capacitance that are connected with described control circuit, is connected with described auxilliary winding after described running electric capacity and the starting capacitance parallel connection, and whether described control circuit is used to control described starting capacitance place in circuit.
2, single-phase AC motor as claimed in claim 1, it is characterized in that, described three-in-one electric capacity is drawn A, B, three leads of C, lead A is drawn by the electromotive force reference point on the described control circuit, end with described main winding and auxilliary winding is connected respectively, and lead B is drawn by an end of described running electric capacity, is connected with the other end of described auxilliary winding, lead C is drawn by the other end of described running electric capacity and an end of described starting capacitance, is connected with the other end of described main winding.
3, single-phase AC motor as claimed in claim 2, it is characterized in that, described control circuit comprises control chip, bidirectional triode thyristor and inductance, described bidirectional triode thyristor and inductance are connected between described starting capacitance and the described lead B, and whether described control chip controls described starting capacitance place in circuit by the break-make of controlling described bidirectional triode thyristor.
4, single-phase AC motor as claimed in claim 3 is characterized in that, described control chip comprises:
First control chip, second control chip, described second control chip generates control signal according to the variation of described auxilliary winding both end voltage, and described control signal sent to described first control chip, described first control chip is controlled the break-make of described bidirectional triode thyristor according to described control signal.
5, single-phase AC motor as claimed in claim 4 is characterized in that, described first control chip is a photoelectrical coupler, and second control chip is a voltage comparator.
6, single-phase AC motor as claimed in claim 5 is characterized in that, described control circuit also comprises:
Discharge resistance is connected in parallel on described starting capacitance two ends.
As the described single-phase AC motor of claim 1～6, it is characterized in that 7, described three-in-one electric capacity is installed in described casing outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101179649A CN101345463A (en) | 2008-08-18 | 2008-08-18 | Single phase AC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101179649A CN101345463A (en) | 2008-08-18 | 2008-08-18 | Single phase AC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101345463A true CN101345463A (en) | 2009-01-14 |
Family
ID=40247379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101179649A Pending CN101345463A (en) | 2008-08-18 | 2008-08-18 | Single phase AC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101345463A (en) |
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2008
- 2008-08-18 CN CNA2008101179649A patent/CN101345463A/en active Pending
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Open date: 20090114 |