CN102386823B - Motor speed adjusting device - Google Patents
Motor speed adjusting device Download PDFInfo
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- CN102386823B CN102386823B CN201110318109.6A CN201110318109A CN102386823B CN 102386823 B CN102386823 B CN 102386823B CN 201110318109 A CN201110318109 A CN 201110318109A CN 102386823 B CN102386823 B CN 102386823B
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Abstract
The invention relates to a motor speed adjusting device. A control circuit of the motor speed controller mainly comprises a PWM (pulse-width modulation) unit, a main control unit and a load unit, wherein the PWM unit outputs a pulse wave with an adjustable duty ratio to the main control unit, the main control unit is connected with two ends of a capacitor of the load unit in parallel so as to be used for controlling the capacitor to charge or discharge, the capacitor of the load unit is in serial connection on a motor needing of speed adjustment, the PWM unit outputs the pulse wave to the main control unit, the main control unit taken as a switch is connected at the two ends of the capacitor of the load unit in parallel, the load unit and the capacitor are connected on the motor in series, the pulse wave controls the connection and the disconnection of the switch to carrying out charge and discharge on the capacitor, when the duty ratio of the pulse wave is adjusted, and changed pulse signals are converted into the change of charge and discharge time of the capacitor by the main control unit, so that the reactance value of a reactor can change along with the change of the charge and discharge time, so as to realize stepless speed adjustment. Compared with the prior art, the motor speed adjusting device is easy in circuit, easy to realize, low in manufacturing cost, simultaneously can not generate high-frequency interference and can realize the stepless speed adjustment on the motor.
Description
Technical field
The present invention relates to a kind of electric system of household electrical appliance, especially a kind of machine governor.
Background technology
Current known electric machine speed regulation mode is mainly divided following four kinds:
1. tap speed-regulating, realizes by change stator winding.This technology maturation, cost is low, uses generally, but belongs to gear speed governing, cannot realize stepless speed regulation.
2. reactor speed governing, is that the applied voltage by reducing motor is realized, and divides again traditional reactor speed governing and the speed governing of condenser type reactance device.The former feature is that each grade of speed regulates easily, and coiling is simple, easy to maintenance, but inductor volume is large, weight is large, speed adjusting performance is poor, low or first gear difficulty in starting; The latter compares with the former, has improved startability and speed ratio, but both cannot realize stepless speed regulation.
3. controllable silicon moving-phase speed control, carrys out regulation voltage by changing the silicon controlled angle of flow, realizes speed governing.The method circuit is simple, can realize stepless speed regulation, but utilizes thyristor speed control can produce a large amount of harmonic waves, and strong High-frequency Interference cannot be eliminated.
4. frequency control, reaches speed governing by adjusting the incoming frequency of motor.Though the method can realize stepless speed regulation, do not produce High-frequency Interference, involve great expense, be difficult to apply.
Above-mentioned mode of speed regulation all cannot reach not only cheap, the requirement that is easy to apply but also do not produce the stepless speed regulation of High-frequency Interference.
Summary of the invention
For above the deficiencies in the prior art, the object of the invention is avoiding producing under the prerequisite of High-frequency Interference, a kind of variable reactance formula stepless speed regulation scheme of cheap, simple and feasible is provided, solves existing electric machine speed regulation and cannot realize stepless speed regulation, produce High-frequency Interference, involve great expense so that problem that cannot be universal.
The object of the invention is by realizing by the following technical solutions:
A kind of machine governor, the control circuit of described machine governor comprises pulse wave signal generating unit, main control unit and load unit, described pulse wave signal generating unit is exported the adjustable pulse wave of a duty ratio to described main control unit, this main control unit is connected in parallel on the electric capacity two ends of described load unit and controls discharging and recharging of this electric capacity, and the capacitances in series of described load unit is on the motor that needs speed governing.
As the preferred technical solution of the present invention, described pulse wave signal generating unit comprises PWM unit, and described PWM unit mainly produces chip U1 by pulse wave and variable resistor POT2 forms, and can change the duty ratio of pulse wave while regulating POT2; Described load unit comprises capacitor C X; Described main control unit comprises power tube Q1 and inductance L 1.
As the preferred technical solution of the present invention, described governor circuit is by conducting or the shutoff of the pulse wave signal power ratio control pipe Q1 of described PWM unit output, thus realization discharging and recharging capacitor C X in described load unit; Between pulse wave high period, power tube Q1 conducting, makes capacitor C X discharge by the discharge loop of governor circuit; Between pulse wave low period, power tube Q1 cut-off, discharge loop disconnects, and load unit charges to capacitor C X, and capacitor C X alternately discharges and recharges the reactance value of reactor is constantly changed.
As the preferred technical solution of the present invention, described pulse wave signal generating unit also comprises single-chip microprocessor MCU, and MCU circuit produces the adjustable pulse wave signal of duty ratio.
Control circuit of the present invention is mainly become by PWM(Pulse Wide Modulation PWM) unit (speed adjustment unit), main control unit and load unit form.Wherein a pulse wave is exported to main control unit in PWM unit, and main control unit is equivalent to a switch in parallel at the two ends of load unit electric capacity, and load unit capacitances in series is on motor, and the break-make of pulse wave control switch discharges and recharges electric capacity.In the time adjusting the duty ratio of pulse wave, the time that discharges and recharges that the pulse wave signal of variation is translated into electric capacity by main control unit changes, and the reactance value of reactor is changed thereupon, realizes stepless speed regulation.
The invention has the beneficial effects as follows: with respect to prior art, circuit of the present invention is simple, easily realize, and cost of manufacture is low; Do not produce High-frequency Interference, and can realize the stepless speed regulation to motor simultaneously.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and specific embodiment, the invention will be further described:
Fig. 1 is principle analysis figure of the present invention;
Fig. 2 is the electrical schematic diagram of the embodiment of the present invention.
Embodiment
As depicted in figs. 1 and 2, PWM of the present invention unit mainly produces chip U1 by pulse wave and variable resistor POT2 forms, and can change the duty ratio of pulse wave while regulating POT2.Governor circuit is by pulse wave signal controlled discharge loop.CX two ends in load unit are connected to filter capacitor C4 through rectifier bridge stack BD1.PWM unit output pulse wave signal, the R3 of process governor circuit is added in the control utmost point of power tube Q1, the conducting of power ratio control pipe or shutoff.Between pulse wave high period, Q1 conducting, makes capacitor C X discharge by the discharge loop of governor circuit; Between pulse wave low period, Q1 cut-off, discharge loop disconnects, load unit charges to CX, electric capacity alternately discharges and recharges the reactance value of reactor is constantly changed, if the duty ratio of pulse wave signal is constant, CX to discharge and recharge the time certain, the reactance value of reactor is certain, and motor rotates with given pace.When regulating POT2, while making the duty ratio of pulse wave become large, CX lengthens discharge time, and the reactance value of reactor diminishes, and electric machine rotation speed becomes greatly; Otherwise when regulating POT2, when the duty ratio of pulse wave is diminished, CX shortens discharge time, and the reactance value of reactor becomes greatly, and electric machine rotation speed diminishes.
As another kind of execution mode, PWM element output signal also can produce the adjustable pulse wave signal of duty ratio by MCU or other circuit.
Claims (1)
1. a machine governor, it is characterized in that: the control circuit of described machine governor comprises pulse wave signal generating unit, main control unit and load unit, described pulse wave signal generating unit is exported the adjustable pulse wave signal of a duty ratio to described main control unit, and this main control unit is connected in parallel on the electric capacity two ends of described load unit and controls discharging and recharging of this electric capacity;
Described pulse wave signal generating unit comprises PWM unit or single-chip microprocessor MCU circuit, and described PWM unit mainly produces chip U1 by pulse wave signal and variable resistor POT2 forms, and can change the duty ratio of pulse wave signal while regulating variable resistor POT2; Described single-chip microprocessor MCU circuit produces the adjustable pulse wave signal of duty ratio;
The electric capacity of described load unit comprises capacitor C X; Described main control unit comprises power tube Q1 and inductance L 1;
Described main control unit is by conducting or the shutoff of the pulse wave signal power ratio control pipe Q1 of described PWM unit output, thus realization discharging and recharging capacitor C X in described load unit; Between pulse wave signal high period, power tube Q1 conducting, makes capacitor C X discharge by the discharge loop of governor circuit; Between pulse wave signal low period, power tube Q1 cut-off, discharge loop disconnects, and load unit charges to capacitor C X, and capacitor C X alternately discharges and recharges the reactance value of reactor is constantly changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110318109.6A CN102386823B (en) | 2011-10-19 | 2011-10-19 | Motor speed adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110318109.6A CN102386823B (en) | 2011-10-19 | 2011-10-19 | Motor speed adjusting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102386823A CN102386823A (en) | 2012-03-21 |
| CN102386823B true CN102386823B (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110318109.6A Active CN102386823B (en) | 2011-10-19 | 2011-10-19 | Motor speed adjusting device |
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| CN (1) | CN102386823B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348400B (en) * | 2013-07-31 | 2016-12-07 | 华为终端有限公司 | A kind of motor drive circuit and mobile terminal |
| CN105515283B (en) * | 2015-12-07 | 2018-06-26 | 珠海格力电器股份有限公司 | Motor and its alignment circuit and method |
| CN109088568A (en) * | 2018-10-11 | 2018-12-25 | 苏州萨得尔电动工具有限公司 | The stepless speed regulation circuit of power spraye |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2057244U (en) * | 1989-10-28 | 1990-05-16 | 宋开蓉 | Speed regulator of electric fan |
| CN2071270U (en) * | 1989-11-22 | 1991-02-13 | 龚继宗 | Electronic speed adjuster of electric fan |
| CN2113369U (en) * | 1991-11-14 | 1992-08-19 | 徐淇 | Speed regulation controller for electric fan |
| CN1373554A (en) * | 2002-04-11 | 2002-10-09 | 黄国意 | Energy-saving method and device for motor |
| CN202309600U (en) * | 2011-10-19 | 2012-07-04 | 格力电器（中山）小家电制造有限公司 | Speed regulator of a motor |
-
2011
- 2011-10-19 CN CN201110318109.6A patent/CN102386823B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2057244U (en) * | 1989-10-28 | 1990-05-16 | 宋开蓉 | Speed regulator of electric fan |
| CN2071270U (en) * | 1989-11-22 | 1991-02-13 | 龚继宗 | Electronic speed adjuster of electric fan |
| CN2113369U (en) * | 1991-11-14 | 1992-08-19 | 徐淇 | Speed regulation controller for electric fan |
| CN1373554A (en) * | 2002-04-11 | 2002-10-09 | 黄国意 | Energy-saving method and device for motor |
| CN202309600U (en) * | 2011-10-19 | 2012-07-04 | 格力电器（中山）小家电制造有限公司 | Speed regulator of a motor |
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| Publication number | Publication date |
|---|---|
| CN102386823A (en) | 2012-03-21 |
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