CN1065563A - A kind of wound AC motor starting and speed regulating device - Google Patents
A kind of wound AC motor starting and speed regulating device Download PDFInfo
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- CN1065563A CN1065563A CN 91107356 CN91107356A CN1065563A CN 1065563 A CN1065563 A CN 1065563A CN 91107356 CN91107356 CN 91107356 CN 91107356 A CN91107356 A CN 91107356A CN 1065563 A CN1065563 A CN 1065563A
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Abstract
A kind of starting of wound AC motor and speed regulating device, be characterized in break-makeization, thereby control rotor loop current average is equivalent to change rotor outer meeting resistance by electronic switch in the change rotor loop, make it can realize automatic starting, again can continuous speed adjustment.This device rotor loop is not gone here and there additional resistance, has overcome rotor loop and has changed form consumption the shortcoming on additional resistance of the slip loss of the existing motor of rheostatic speed regulation method with heating, realizes the purpose of economize on electricity starting and speed governing.
Description
The invention belongs to the Motor Control field.
Wire wound asynchronous motor is connected in series additional resistance in rotor loop just can realize speed governing, suitable as long as resistance is selected simultaneously, both can increase starting torque, can reduce starting current again, can do the starting of motor strip resistance.Traditional rotor string additional resistance speed governing is a convert resistance step by step, can not realize the governing speed of continuously smooth, and is to have the contact to switch.During the rotor series resistance starting, also be to come convert resistance, reach the purpose of starting by contactor.If adopt the speed governing of rotor electric resistance wave device control equivalent resistance can realize the adjusting of rotating speed continuously smooth.Realize non-contact work.Rotor electric resistance wave device governing system is to make rotor additional resistance high frequency ground short circuit and access by chopper, in rotor loop, form an equivalent resistance, by changing the make-to-break ratio of chopper continuously, just change the equivalent resistance of rotor loop serially, realize speed governing.Controlling schemes with chopper control rotor equivalent resistance makes the equipment investment of governing system few, and device is simple, and method is easy, reliability height, advantage such as starting performance is good.
But rotor loop change the inherent defect of the method for rheostatic speed regulation be the slip loss of motor with the form consumption of heating on chopper and additional resistance.
The objective of the invention is to provide a kind of wound AC motor starting and speed regulating device.This system had both had rotor series resistance speed reliability height, small investment, method is simple, advantages such as starting and speed control device unification, because do not go here and there additional resistance in the rotor loop, therefore overcome form consumption the shortcoming on additional resistance of slip loss to generate heat of the existing motor of method of rotor loop change rheostatic speed regulation again again.
To achieve the object of the present invention, this wound AC motor starting and speed regulating device adopt the rotor winding terminal at motor to tap into a uncontrollable rectifier, insert instrument transformer, electric capacity and electronic switch in the DC side.Change the electronic switch on off operating mode, can change the link position of electric capacity and instrument transformer.When electronic switch turn-offs, seal in an electric capacity in the rotor loop DC side.After capacitance voltage was stable, rotor current was zero.Connect when electronic switch, rotor loop current stabilization after-current is a maximum.The make-to-break ratio of control electronic switch, thereby control rotor loop current average are equivalent to change rotor outer meeting resistance, reach the control motor speed.Prestart charges to electric capacity earlier, makes its both end voltage value equal rotor open phase electromotive force when rotor rectifier output voltage 2.34E 2D(E 2D-motor is static).During starting, equivalent resistance is diminished gradually by maximum, and starting torque is correspondingly big from little change, thereby starting-impact is little, realizes electric motor starting.
In order to obtain the automatic control of speed, reach the stable state accuracy that constant current starts and improve speed, introduce negative velocity feedback and Current Negative Three-Point Capacitance and constitute double circle controling mode.
The core of control loop is the trigger generator of control electronic switch break-make, and in fact it is a kind of pulse width regulator of simple form, can comprehensive various signals controls the make-to-break ratio of electronic switch automatically, realizes the purpose of control rotating speed.
In order to make the system can safe and reliable operation, need carry out various protections, comprise operation logic protection, short circuit, overcurrent, the phase failure, overvoltage and protection such as under-voltage.
Electronic switch is made up of as power switch power device.
For this device only when the starter, an available starting contactor with three output short circuits of rotor winding together, just can recover the inherent characteristic of motor after starting finishes.
1 provide embodiment in conjunction with the accompanying drawings: a kind of wound AC motor starting and speed regulating device.It comprises rotor loop and control loop.In the rotor loop, at three-phase bridge rectifier of motor rotor winding termination, its DC side is made up of instrument transformer, electric capacity, diode, electronic switch.Charging device 7 links to each other with the two ends of electric capacity.
Instrument transformer is made up of two closely-coupled mutual inductors 1 and coil 2.The end of the same name of mutual inductor 1 is connected with the anode of three-phase bridge rectifier output.The end of the same name of mutual inductor 2 is connected with the negative terminal of three-phase bridge rectifier output.The two ends of electric capacity and mutual inductor 1 are connected with 2 non-same polarity.The anode of diode is connected with the non-same polarity of mutual inductor 2.Be connected with the non-same polarity of mutual inductor 1 output of electronic switch of the input of electronic switch is connected with the negative electrode of diode.Output end of driver links to each other with the control end of electronic switch.Velocity setting signal U
gWith feedback speed signal U
FmInput signal as speed regulator.Its output signal and current feedback signal U
FiInput signal as current regulator.Its output signal is as the input signal of trigger generator.Trigger generator output links to each other with the input of driver.
Because rotor loop is not connected in series additional resistance, realizes starting and speed governing.Therefore overcome the shortcoming of form consumption on additional resistance of slip loss to generate heat of the existing motor of method of rotor loop change rheostatic speed regulation.And make still that this apparatus structure is simple, reliability is high, reach the purpose of energy-saving speed regulating.This device can substitute starting resistance or frequency sensitive trheostat, makes electric motor starting.Realize the starting purpose.Also can realize dynamic braking.
Fig. 1 is the schematic diagram of a kind of wound AC motor starting and speed regulating device.
Description of drawings: 3-speed regulator
The 4-current regulator
The 5-trigger generator
The 6-driver
The 7-charging device
Claims (5)
1, starting of a kind of wound AC motor and speed regulating device, its motor rotor loop are by three-phase bridge rectifier, instrument transformer, electric capacity, and diode and electronic switch are formed.It is characterized in that: uncontrollable three-phase bridge rectifier of motor rotor winding termination, three outputs of motor rotor winding are connected with three inputs of three-phase bridge rectifier, instrument transformer is made up of two closely-coupled mutual inductors 1 and coil 2, and the inductance of two mutual inductors is identical.
2, according to claims 1 described device, it is characterized in that:
The end of the same name of mutual inductor 1 is connected with the anode of three-phase bridge rectifier output.The end of the same name of mutual inductor 2 is connected with the negative terminal of three-phase bridge rectifier output.The two ends of electric capacity and mutual inductor 1 are connected with 2 non-same polarity.The anode of diode is connected with the non-same polarity of mutual inductor 2, and the negative electrode of diode is connected with the end of the same name of mutual inductor 2.The input of electronic switch is connected with the non-same polarity of mutual inductor 1.The output of electronic switch is connected with the negative electrode of diode.
3, a kind of wound AC machine starting and speed regulating device are made up of speed regulator, current regulator, trigger generator, driver in control loop.It is characterized in that: the velocity setting signal is connected with the input of speed regulator with feedback speed signal.The output of current feedback signal and speed regulator is connected with the input of current regulator.The output of current regulator is connected with trigger generator.The input of driver links to each other with the output of trigger generator.
4, according to claims 1 or 2 or 3 described devices, it is characterized in that: being defeated by electronic switch controling end is the output signal of driver as the electronic switch control signal.
5, a kind of wound AC motor starting and speed regulating device is characterized in that: have two outputs of a charging device to link to each other with two ends of electric capacity in the rotor loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91107356 CN1065563A (en) | 1991-04-02 | 1991-04-02 | A kind of wound AC motor starting and speed regulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91107356 CN1065563A (en) | 1991-04-02 | 1991-04-02 | A kind of wound AC motor starting and speed regulating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1065563A true CN1065563A (en) | 1992-10-21 |
Family
ID=4908703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91107356 Pending CN1065563A (en) | 1991-04-02 | 1991-04-02 | A kind of wound AC motor starting and speed regulating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1065563A (en) |
-
1991
- 1991-04-02 CN CN 91107356 patent/CN1065563A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |