CN201805399U

CN201805399U - Single-phase motor speed governor

Info

Publication number: CN201805399U
Application number: CN2010202316538U
Authority: CN
Inventors: 高玉琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-10
Filing date: 2010-06-10
Publication date: 2011-04-20
Anticipated expiration: 2020-06-10

Abstract

A single-phase motor speed governor relates to a variable-frequency governor of a low-power single-phase motor, can overcomes the defect of the prior art that range of the variable voltage control of controllable silicon is not big, and can be manufactured with rather low cost. The single-phase motor speed governor comprises a frequency tunable square wave signal generating circuit (10), a high-voltage power supply circuit (30)and a low-voltage power supply circuit (40); the single-phase motor speed governor is characterized in that a motor drive circuit (20) is also included in the single-phase motor speed governor, and the motor drive circuit (20) comprises optical couplers U2-U3, triodes T1-T2, electrolytic capacitors C3-C4, resistors R2-R5 and diodes D1-D4; the triodes T1-T2 are alternately conducted under the control of the frequency tunable square wave signal so as to enable the current to charge and discharge the electrolytic capacitors C3-C4 through the single-phase motor and subsequently drive the motor to rotate, and the motor speed is controlled within the range of 20% to 100 % of the rated speed; and the single-phase motor speed governor is applicable to industries as household appliances, medical appliances and the like.

Description

A kind of monophase machine speed regulator

Technical field

The utility model relates to the variable-frequency governor of small-power load motor.

Background technology

The pressure swing type speed regulator is generally adopted in speed governing to the small-power load motor in the prior art, promptly by changing the input voltage that the silicon controlled angle of flow in the described pressure swing type speed regulator changes motor, realize the variation of motor speed, simple in structure, the low cost of manufacture of this pressure swing type speed regulator, but speed adjustable range is less, reduce to 70% when following of rated speed when motor speed, rotating speed at this moment is extremely unstable, the motor cisco unity malfunction; And existing variable-frequency governor can be realized large-scale speed governing, but because price is higher, seldom uses again on the small-power load motor.

Summary of the invention

The purpose of this utility model is to provide a kind of monophase machine speed regulator, can realize that bigger speed adjustable range can create with lower cost again.

The technical solution of the utility model is: described monophase machine speed regulator comprises the square-wave signal generation circuit 10 of frequency adjustable, high-voltage power circuit 30, low-voltage power circuit 40, it is characterized in that: described monophase machine speed regulator also comprises motor-drive circuit 20, described motor-drive circuit 20 comprises optocoupler U2-U3, triode T1-T2, electrochemical capacitor C3-C4, resistance R 2-R5, diode D1-D4, their annexation is: the emitter of triode T1, the collector electrode of triode T2, the anode of diode D1, the negative electrode of diode D2, the end of external monophase machine DJ after 4 pin of optocoupler U3 are connected, the negative pole of electrochemical capacitor C3, the positive pole of electrochemical capacitor C4, the anode of diode D3, the other end of external monophase machine DJ after the negative electrode of diode D4 is connected, the base stage of triode T1 is connected with 3 pin of optocoupler U2 by resistance R 4, the base stage of triode T2 is connected with 3 pin of optocoupler U3 by resistance R 5,4 pin of optocoupler U2, the collector electrode of triode T1, the negative electrode of diode D1, the negative electrode of diode D3, the positive pole of electrochemical capacitor C3 and high-tension circuit 30+end (anode) is connected, the emitter of triode T2, the anode of diode D2, the anode of diode D4, the negative pole of electrochemical capacitor C4 is connected with an end (negative terminal) of high-

voltage power circuit

30,1 pin of optocoupler U2 connects output 3 pin of the time-base integrated circuit U1 in the described square-wave signal generation circuit 10 by resistance R 2, the 2 pin ground connection of optocoupler U2,2 pin of optocoupler U3 connect another output 7 pin of time-base integrated circuit U1 by

resistance R

3,1 pin of optocoupler U3 connect described low-voltage power circuit 40+the 9V end.

The utility model compared with prior art has following beneficial effect:

1, the speed adjustable range of described monophase machine speed regulator is the rated speed of 20%-100%, and is more much bigger than the scope of the technical scheme of passing through the controllable silicon variable voltage speed control of prior art.

2, the used electronic component of described monophase machine speed regulator is less and price is low, and is more much lower than the manufacturing cost of existing variable-frequency governor, and more use occasion can be arranged.

Description of drawings

Accompanying drawing is the electrical schematic diagram of monophase machine speed regulator

Embodiment

Now contrast the preferred embodiment of description of drawings the utility model.

Described monophase machine speed regulator comprises square-wave signal generation circuit 10, motor-drive circuit 20, high-voltage power circuit 30, low-voltage power circuit 40.

Square-wave signal generation circuit 10 is by 555 time-base integrated circuit U1, resistance R 1, potentiometer W1, capacitor C 1-C2 forms, its annexation is: 2 pin of time-base integrated circuit U1, the end of 6 pin and potentiometer W1, the positive pole of capacitor C 1 is connected, the other end of potentiometer W1 is connected with 3 pin of time-base integrated circuit U1 by resistance R 1,8 pin of time-base integrated circuit U1,4 pin connect low-voltage power circuit 40+9V end, 5 pin of time-base integrated circuit U1 are by capacitor C 2 ground connection, 1 pin of time-base integrated circuit U1, the minus earth of

capacitor C

1,3 pin of time-base integrated circuit U1,7 pin are the output of square-wave signal.

Motor-drive circuit 20 is by optocoupler U2-U3, triode T1-T2, electrochemical capacitor C3-C4, resistance R 2-R5, diode D1-D4, their annexation is: the emitter of triode T1, the collector electrode of triode T2, the anode of diode D1, the negative electrode of diode D2, the end of order phase motor D J after 4 pin of optocoupler U3 are connected, the negative pole of electrochemical capacitor C3, the positive pole of electrochemical capacitor C4, the anode of diode D3, the other end of order phase motor D J after the negative electrode of diode D4 is connected, the base stage of triode T1 is connected with 3 pin of optocoupler U2 by resistance R 4, the base stage of triode T2 is connected with 3 pin of optocoupler U3 by resistance R 5,4 pin of optocoupler U2, the collector electrode of triode T1, the negative electrode of diode D1, the negative electrode of diode D3, the positive pole of electrochemical capacitor C3 and high-tension circuit 30+end (anode) is connected, the emitter of triode T2, the anode of diode D2, the anode of diode D4, the negative pole of electrochemical capacitor C4 is connected with an end (negative terminal) of high-

voltage power circuit

resistance R

3,1 pin of optocoupler U3 connect described low-voltage power circuit 40+the 9V end.Described optocoupler U2, its model of U3 are TLP627.

High-voltage power circuit 30 is made up of bridge rectifier QL1, filter capacitor C5, and the direct current of 310V is provided for motor-drive circuit 20.

Low-voltage power circuit 40 is made up of step-down transformer B, bridge rectifier QL2, filter capacitor C6-C7,7809 integrated regulator U4, for the input of square-wave signal generation circuit 10 and optocoupler U2, U3 provides+D.C. regulated power supply of 9V.

Be the operation principle that example illustrates described monophase machine speed regulator now with regard to laboratory solutions employed vortex mixer.Monophase machine DJ in the described solution vortex mixer is 2800 rev/mins of its rotating speeds of shaded-pole monophase machine, 40 watts of power, and requiring speed adjustable range is 600-2800 rev/min.

Described square-wave signal generation circuit 10 generation two-way duty ratios are 50% square-wave signal, select the resistance of resistance R 1, potentiometer W1 and the appearance value of capacitor C 1 that the square-wave signal frequency range is regulated by potentiometer W1 in 10-60HZ, frequency change, this square-wave signal one road is delivered to the optocoupler U2 input of motor-drive circuit 20, motor-drive circuit 20 is delivered on another road from output 7 pin of time-base integrated circuit U1 optocoupler U3 input from output 3 pin of time-base integrated circuit U1.When input 1 pin of optocoupler U2, input 1 pin, the 2 pin no currents of optocoupler U3 when 2 pin have electric current, output 4 pin of optocoupler U2,3 pin conductings, triode T1 conducting, triode T2 are ended, and the electric current of high-voltage power circuit 30 flows through through triode T1, monophase machine DJ, electrochemical capacitor C4; When input 1 pin of optocoupler U3, input 1 pin, the 2 pin no currents of optocoupler U2 when 2 pin have electric current, output 4 pin of optocoupler U3,3 pin conductings, make triode T2 conducting, triode T1 ends, the electric current of high-voltage power circuit 30 flows through through electrochemical capacitor C3, monophase machine DJ, triode T2 again, in monophase machine DJ, form alternating current, monophase machine is rotated.According to rated power and the rated speed of monophase machine DJ, the capacity of choose reasonable electrochemical capacitor C3, C4 can make the current waveform that flows through motor be similar to sine wave in the 10-60HZ frequency range.The resistance of regulator potentiometer W1 can make the rotating speed of monophase machine DJ change in 500 to 3000 rev/mins of scopes, and the solution vortex mixer all can operate as normal under the different rotating speeds.

Diode D1-D4 plays the afterflow effect in the described motor-drive circuit 20 when monophase machine DJ electric current commutates, and makes motor current waveform smooth.Optocoupler U2, U3 play buffer action to high voltage source, prevent from square-wave signal generation circuit 10 is produced interference, make handling safety simultaneously.

30 pairs of 220V single-phase alternating currents of described high-voltage power circuit rectifying and wave-filtering provides power supply for motor-drive circuit 20.

The step-down of 40 pairs of 220V single-phase alternating currents of described low-voltage power circuit, rectification, filtering, voltage stabilizing provide power supply for square-wave signal generation circuit 10 and optocoupler U2, U3 input.

Claims

1. monophase machine speed regulator, the square-wave signal generation circuit (10) that comprises frequency adjustable, high-voltage power circuit (30), low-voltage power circuit (40), it is characterized in that: described monophase machine speed regulator also comprises motor-drive circuit (20), described motor-drive circuit (20) comprises optocoupler U2-U3, triode T1-T2, electrochemical capacitor C3-C4, resistance R 2-R5, diode D1-D4, their annexation is: the emitter of triode T1, the collector electrode of triode T2, the anode of diode D1, the negative electrode of diode D2, the end of external monophase machine DJ after 4 pin of optocoupler U3 are connected, the negative pole of electrochemical capacitor C3, the positive pole of electrochemical capacitor C4, the anode of diode D3, the other end of external monophase machine DJ after the negative electrode of diode D4 is connected, the base stage of triode T1 is connected with 3 pin of optocoupler U2 by resistance R 4, the base stage of triode T2 is connected with 3 pin of optocoupler U3 by resistance R 5,4 pin of optocoupler U2, the collector electrode of triode T1, the negative electrode of diode D1, the negative electrode of diode D3, the positive pole of electrochemical capacitor C3 is connected with "+" end of high-tension circuit (30), the emitter of triode T2, the anode of diode D2, the anode of diode D4, the negative pole of electrochemical capacitor C4 is connected with " one " end of high-voltage power circuit (30), 1 pin of optocoupler U2 connects output 3 pin of the time-base integrated circuit U1 in the described square-wave signal generation circuit (10) by resistance R 2, the 2 pin ground connection of optocoupler U2,2 pin of optocoupler U3 connect another output 7 pin of time-base integrated circuit U1 by resistance R 3,1 pin of optocoupler U3 connect described low-voltage power circuit (40)+the 9V end.