CN203872101U

CN203872101U - AC motor controller

Info

Publication number: CN203872101U
Application number: CN201420315464.7U
Authority: CN
Inventors: 李阳
Original assignee: Shuangliu County Power Supply Branch Of State Grid Sichuan Electric Power Co
Current assignee: Shuangliu County Power Supply Branch Of State Grid Sichuan Electric Power Co
Priority date: 2014-06-14
Filing date: 2014-06-14
Publication date: 2014-10-08
Anticipated expiration: 2024-06-14

Abstract

The utility model relates to an AC motor controller comprising an induction current feedback circuit; the induction current feedback circuit comprises a first triode, a second triode, a diode, an induction resistor, an adjusting resistor and a bias resistor; an anode and a cathode of the diode are respectively connected with a motor rotor current output end and an emitter electrode of the first triode; the induction resistor is connected between the rotor current output end and an AC power supply zero line; the adjusting resistor is connected between an AC power supply live line and the rotor current output end; a collector electrode of the second triode is connected with the adjusting resistor; a base electrode of the first triode is connected with the adjusting resistor through a base electrode voltage stabilizing circuit. The AC motor controller can automatically detect motor load and input voltage changes according to the induction motor rotor current so as to adjust motor power consumption, stabilizes motor rotation speed and output power, so the motor can stably operate.

Description

Alternating current motor controller

Technical field

The utility model relates to electronic circuit field, particularly, relates to a kind of alternating current motor controller.

Background technology

Electro-motor, is called again motor or motor, is that electric energy conversion is become mechanical energy by one, and can re-use mechanical energy generation kinetic energy, is used for driving the electric equipment of other devices.Motor kind is very various, but can roughly be divided into alternating current motor and DC motor for different occasions.General civilian alternating current motor voltage has two kinds of 110V and 220V etc., also has the kenel such as 380V or 440V in commercial Application.

The Principle of Rotating of motor according to being the bright left hand rule of Buddhist, when a wire is placed in magnetic field, if wire is electrified stream, wire can cutting magnetic field line that wire is produced is mobile.Electric current enters coil and produces magnetic field, utilizes the magnetic effect of electric current, and the device that electromagnet is rotated continuously in fixing magnet, can convert electric energy to mechanical energy.The magnetic field producing with permanent magnet or by another group coil interacts and produces power.Alternating current motor is the logical upper alternating current of stator winding coil, produces rotating magnetic field, and rotating magnetic field attracts rotor to rotate together.

In reality behaviour in service, because being subject to a large amount of uncontrollable factors, utility grid operation disturbs, easily there is of short duration voltage jump, or owing to driving the variation of load, while making the power output variation of motor, rotor torque changes violent, affect electro-motor even running, produce noise and mechanical shaking, increase extra power consumption, and reduce motor life.

Utility model content

For overcoming existing electro-motor in input and producing the labile state of long period when load variations, generation noise and shake also reduces the technological deficiency of motor life, the utility model discloses a kind of alternating current motor controller.

Alternating current motor controller described in the utility model, comprise AC power and motor, also comprise induced current feedback circuit, described induced current feedback circuit comprises the first triode, the second triode, diode, inductive reactance, regulating resistance and biasing resistor composition;

Described diode both positive and negative polarity is the rotor current output of connecting motor and the emitter of the first triode respectively, described inductive reactance is connected between rotor current output and AC power zero line, described regulating resistance is connected between AC power live wire and rotor current output, described the first transistor collector connects the second transistor base, the emitter of described the second triode connects AC power zero line, and described biasing resistor is connected between the emitter and AC power live wire of the first triode;

Described the second transistor collector connects regulating resistance, described the first transistor base connects regulating resistance by base stage voltage stabilizing circuit, described base stage voltage stabilizing circuit is made up of rectifier diode, voltage stabilizing didoe, base stage electric capacity of voltage regulation, described voltage stabilizing didoe and base stage electric capacity of voltage regulation be connected in parallel on and the first transistor base between, described rectifier diode both positive and negative polarity connects respectively regulating resistance and the first transistor base.

Preferably, between the base stage of described the first triode and collector electrode, be connected with filter capacitor.

Preferably, between the live wire of described AC power and motor, be connected with filter inductance.

Preferably, between the collector and emitter of described the second triode, be parallel with the second biasing resistor, between described the second transistor collector and inductive reactance, be also connected with divider resistance.

Concrete, described regulating resistance is composed in series by adjustable resistance and fixed resistance.

Alternating current motor controller described in the utility model, can automatically detect the variation of motor load and input voltage according to the rotor current of induction motor, governor motor power consumption, stablize motor rotary speed and power output, make motor operation steady, by the extremely low common separation device of use cost, further reduce manufacturing cost.

Brief description of the drawings

Fig. 1 is a kind of embodiment schematic diagram of the utility model;

Mark and corresponding parts title: T1-the first triode in accompanying drawing, T2-the second triode, VIN-AC power, L-filter inductance, A-live wire, N-zero line, MOT-motor, VD-diode, R1 – biasing resistor, R2-fixed resistance, R3-inductive reactance, RP-adjustable resistance C1-filter capacitor, C2-base stage electric capacity of voltage regulation IM-rotor current, SD-rectifier diode, ZD-voltage stabilizing didoe.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the utility model is done to detailed description further, but execution mode of the present utility model is not limited to this.

As shown in Figure 1, alternating current motor controller described in the utility model, comprise AC power and motor, also comprise induced current feedback circuit, described induced current feedback circuit comprises the first triode, the second triode, diode, inductive reactance, regulating resistance and biasing resistor composition;

For example work as because load is risen, motor negative terminal increases, and rotor current IM is increased, but the undertension now distributing due to motor makes rotating speed have reduction trend.Now IM rises, the pressure drop of flowing through R3 increases, the conduction voltage drop of diode VD is constant, make the emitter voltage of the first triode T1 increase, thereby the first transistor collector electric current increases, because the second triode provides base current by the first triode, therefore the collector current of the second triode T2 increases thereupon, the collector current of the second triode T2 increases, thereby IM is shunted, thereby the pressure drop at inductive reactance R3 reduces, in fact, the degree of depth conducting of the second triode T2 itself is exactly the voltage reducing between the second transistor collector and emitter.The pressure drop of R3 reduces, and in the situation that input voltage is constant, actual making increases in electro-motor MOT terminal voltage, thereby makes under load increases the weight of situation, and electric current and the voltage of electro-motor synchronously increase, thereby have improved operation stability.

The supply voltage amplitude variation that the utility model causes for electrical network self also has certain anti-interference, for example, in the time that the alternating voltage VIN of input declines, the first transistor base voltage is connected with input live wire A by regulating resistance, the first transistor base voltage drop, electro-motor MOT both end voltage reduces simultaneously, but due to the pressure stabilization function of diode VD, it is many that the emitter current potential of the first triode T1 does not have that base stage falls, still make the actual rising of VBE of the first triode T1, the output current of the first triode increases, according to aforementioned same reason, finally make the magnitude of voltage distributing on electro-motor MOT increase, thereby overcome due to the decline problem of the electro-motor voltage drop causing of input voltage.

The effect of biasing resistor R1 is to set up DC point for the first triode, by changing the resistance of regulating resistance, can revise the voltage distributing on electro-motor, thereby regulate the rotating speed of electro-motor, described regulating resistance can as shown in Figure 1, be composed in series by adjustable resistance RP and fixed resistance R2.

The function of base stage voltage stabilizing circuit is to press for the first triode provides galvanic current, base stage voltage stabilizing circuit is made up of rectifier diode, voltage stabilizing didoe, base stage electric capacity of voltage regulation, owing to using alternating current at front end, adopt rectifier diode SD to carry out rectification to ac signal, the direct current half-sine wave signal obtaining charges to base stage electric capacity of voltage regulation C2, utilize voltage stabilizing didoe ZD for carrying out voltage stabilizing in capacitor C 2 two ends, voltage stabilizing didoe negative pole connects the first transistor base, plus earth, can adopt Zener diode form single or series connection.Because the base current of the second triode is provided by the collector current of the first triode, therefore stablized the base potential of the first triode, also with regard to indirect stabilization the second transistor base, thereby for two triodes all provide stable DC operation state, avoid alternating voltage amplitude to act directly on the significantly interference noise of signal that the first transistor base causes.

For further reducing the noise jamming of AC power, can take to be connected filter inductance between the live wire of AC power and motor, weaken clutter in input source, also can be to disturbing responsive part, for example between the base stage of the first triode and collector electrode, connect filter capacitor C1.Avoid clutter to cause the output current sudden change of the first triode, the electric current of generation is input to the second triode as base current and is amplified by secondary, causes electro-motor operation unstable.

For further regulating feedback quantity, can be between the collector and emitter of the second triode the second biasing resistor in parallel, between described the second transistor collector and inductive reactance, be connected with divider resistance.Thereby make the change in voltage between the emitter and collector of the second triode be delivered to inductive reactance R3 with a proportionality coefficient, by the second biasing resistor is set, the resistance of divider resistance and inductive reactance, can regulate this proportionality coefficient, controls more easily.

As mentioned above, can realize preferably the utility model.

Claims

1. alternating current motor controller, comprise AC power and motor, it is characterized in that, also comprise induced current feedback circuit, described induced current feedback circuit comprises the first triode, the second triode, diode, inductive reactance, regulating resistance and biasing resistor composition;

2. alternating current motor controller according to claim 1, is characterized in that, between the base stage of described the first triode and collector electrode, is connected with filter capacitor.

3. alternating current motor controller according to claim 1, is characterized in that, between the live wire of described AC power and motor, is connected with filter inductance.

4. alternating current motor controller according to claim 1, is characterized in that, is parallel with the second biasing resistor between the collector and emitter of described the second triode, between described the second transistor collector and inductive reactance, is also connected with divider resistance.

5. alternating current motor controller according to claim 4, is characterized in that, described regulating resistance is composed in series by adjustable resistance and fixed resistance.