CN106208886A - A kind of motor noise-reducing control circuit applied on intelligence clothes airing machine and method thereof - Google Patents

A kind of motor noise-reducing control circuit applied on intelligence clothes airing machine and method thereof Download PDF

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CN106208886A
CN106208886A CN201610595881.5A CN201610595881A CN106208886A CN 106208886 A CN106208886 A CN 106208886A CN 201610595881 A CN201610595881 A CN 201610595881A CN 106208886 A CN106208886 A CN 106208886A
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current
angle
silicon
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CN106208886B (en
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彭东
童威云
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Guangdong Hotata Technology Group Co Ltd
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Abstract

A kind of motor noise-reducing control circuit applied on intelligence clothes airing machine, including MCU controller, phase voltage phase detecting module, current phase detection module, first, second drive circuit and first, second controllable silicon;First, second controllable silicon is connected to motor AC power supply and motor and rotates forward, between the voltage input end of reversion;The phase voltage phase detection signal of MCU controller input phase voltage phase detecting module output and the current phase of current phase detection module output detect signal and process, output first controls signal to the first drive circuit, control the first silicon controlled angle of flow, thus control the input voltage that motor rotates forward, or output second controls signal to the second drive circuit, control the second silicon controlled angle of flow, thus control the input voltage of motor reversal.The present invention also proposes a kind of motor noise-reducing control method applied on intelligence clothes airing machine.Even if present invention motor light running, motor torque and the speed of service also will not increase, and noise is little.

Description

A kind of motor noise-reducing control circuit applied on intelligence clothes airing machine and method thereof
Technical field
The present invention relates to a kind of motor noise-reducing control circuit applied on intelligence clothes airing machine and method thereof.
Background technology
Along with the development of intelligence clothes airing machine industry, exchange tube shaped electric machine is widely used in realizing the lifting merit of intelligence clothes airing machine Can, the control mode that exchange tube shaped electric machine is traditional at present all uses Control, uses the controlling party directly initiating relay Formula drives exchange tube shaped electric machine work, and no matter the load of motor is light load or heavy duty, and relay is all full voltage work, At rated loads, exchange tubulose motor stabilizing runs, and noise is the least, and under light load, exchange tube shaped electric machine is under full voltage Torque increases, and linear velocity increases, and the motor speed of service increases, and promotes motor noise to increase.
Summary of the invention
The purpose of the present invention overcomes the deficiencies in the prior art exactly, it is provided that a kind of motor fall applied on intelligence clothes airing machine Control circuit of making an uproar and method thereof, during motor light running, torque will not increase, and the speed of service will not increase, and motor noise is little.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of motor noise-reducing control circuit applied on intelligence clothes airing machine, including MCU controller, phase voltage phase-detection Module, current phase detection module, the first drive circuit, the first controllable silicon, the second drive circuit and the second controllable silicon;
Phase voltage phase detecting module, detects the zero potential point phase place of motor AC power supply and exports;
Current phase detection module, detects the zero-current point phase place of motor load electric current and exports;
First controllable silicon, is connected between the voltage input end of motor AC power supply and motor rotating forward;
First drive circuit, output drive signal is to the first silicon controlled trigger electrode;
Second controllable silicon, is connected between motor AC power supply and the voltage input end of motor reversal;
Second drive circuit, output drive signal is to the second silicon controlled trigger electrode;
MCU controller, the phase voltage phase detection signal of input phase voltage phase detecting module output and current phase inspection Surveying the current phase detection signal processing of module output, output first controls signal to the first drive circuit, controls the The one silicon controlled angle of flow, thus control the input voltage that motor rotates forward, or output second controls signal to the second drive circuit, Control the second silicon controlled angle of flow, thus control the input voltage of motor reversal.
In one embodiment, described first drive circuit and the second drive circuit, arbitrary drive circuit includes three poles Pipe Q1, photoelectrical coupler IC1 and current-limiting resistance R2, R3, R4, described current-limiting resistance R4 is connected to MCU controller and audion Q1 Base stage between, described current-limiting resistance R3 is connected between the colelctor electrode of audion Q1 and the input of photoelectrical coupler IC1, institute Stating current-limiting resistance R2 and be serially connected in the outfan of photoelectrical coupler IC1, this photoelectrical coupler IC1 output drive signal is to silicon controlled Trigger electrode, triggers controlled silicon conducting.Described first controllable silicon and the second controllable silicon, arbitrary controllable silicon two ends connect RC and absorb electricity Road, this RC absorbing circuit comprises the resistance R1 and electric capacity C1 being connected in series.
The present invention uses controllable silicon semiconductor switch components and parts, gathers phase voltage phase detection signal by MCU controller Detecting signal with current phase, MCU controller is according to the voltage and current phase detection signal collected, the reality of detection motor Band carries situation, then, carries situation according to the actual band of motor, sends control signal, controls the size of thyristor operating angle, thus Control motor input voltage size, with control motor by rated power factor run so that the torque of motor and rotating speed are steady Fixed, it is ensured that motor low noise runs.
Another technical scheme that the present invention uses is as follows:
A kind of motor noise-reducing control method applied on intelligence clothes airing machine, comprises the following steps:
1) specified rate φ 0, motor AC power supply zero potential point when this specified rate φ 0 is motor belt motor nominal load are set Phase place and the difference of motor load current zero current point phase place, this specified rate φ 0 is obtained by reality test;
2) MCU controller output controllable silicon initial turn-on angle control signal, triggers controllable silicon by initially leading through drive circuit Current flow angle turns on, thus controls the initial input voltage of motor;
3) phase voltage phase detection signal and the current phase of MCU controller input phase voltage phase detecting module output is examined Surveying the current phase detection signal of module output, obtaining detection limit φ c, this detection limit φ c is the inspection of phase voltage phase detecting module The motor load current zero electricity that motor AC power supply zero potential point phase place and the current phase detection module measured detects The difference of flow point phase place, detection limit φ c and specified rate φ 0 is compared process, comprises by MCU controller:
If detection limit φ c is more than specified rate φ 0, then under MCU controller controls, progressively reduce silicon controlled conducting Angle, thus progressively reduce the input voltage of motor, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band;
If the deviation of detection limit φ c and specified rate φ 0 is in allowed band, then under MCU controller controls, controllable silicon Turn on by the current angle of flow, keep the present input voltage of motor;
If detection limit φ c is less than specified rate φ 0, then under MCU controller controls, incrementally increase silicon controlled conducting Angle, thus incrementally increase the input voltage of motor, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band, or Till the silicon controlled angle of flow is adjusted to maximum conduction angle.
In one embodiment, described progressively reduce or be stepped up the silicon controlled angle of flow, for: successively decrease by setting value Or the incremental silicon controlled angle of flow, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band.
In another embodiment, described progressively reduce or be stepped up the silicon controlled angle of flow, for: first by bigger Setting value is successively decreased or is incremented by the silicon controlled angle of flow, when the deviation of detection limit φ c and specified rate φ 0 is in allowed band, Successively decrease by less setting value again or be incremented by the silicon controlled angle of flow, until the deviation of detection limit φ c and specified rate φ 0 is allowing In the range of.
The motor AC power supply zero potential point phase place that phase voltage phase detecting module detects detects with current phase The difference of the motor load current zero current point phase place that module detects is detection limit φ c, and this detection limit φ c is exactly the merit of motor Rate factor angle, the power factor of motor is power factor cosine of an angle, so, detect power-factor angle, be equivalent to detect merit Rate factor, and the band that the size of the power factor size of motor or detection limit φ c reflects motor carries situation, motor is that perception is negative Carry, the difference of the voltage-phase of motor AC power supply and the current phase of motor load than nominal load time phase contrast big, Showing that motor is in light condition, at this moment, motor torque is constant, and load lightens, and rotating speed accelerates, and power factor is low, and noise is high, therefore Need to reduce the input voltage of motor, to reduce motor torque, improve power factor, reduce noise.
The present invention utilizes MCU controller automatically to detect motor AC power supply and the phase relation of motor load electric current, Carry situation by its actual band of phase difference detection motor, and be automatically adjusted the silicon controlled angle of flow accordingly, thus be automatically adjusted electricity The input voltage of machine, makes the stabilization of speed of motor, it is ensured that motor power factor levels off to the motor power factor under nominal load, Make motor operate in optimum state, reduce the noise produced due to load change, save the energy simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of embodiment;
Fig. 2 is the control flow chart of embodiment;
Load current and the phase diagram of supply voltage when Fig. 3 is the motor underloading of embodiment;
Load current and the phase diagram of supply voltage when Fig. 4 is the Rated motor load of embodiment;
Fig. 5 is the controlled interval graph of controllable silicon SCR of embodiment;
Fig. 6 is the controllable silicon SCR circuit theory diagrams of embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawings the embodiment of the present invention is described in detail.
As it is shown in figure 1, embodiment include MCU controller, phase voltage phase detecting module, current phase detection module, One drive circuit, the first controllable silicon SCR the 1, second drive circuit and the second controllable silicon SCR 2;Phase voltage phase detecting module detects The zero potential point phase place of motor AC power supply also exports;The zero current of current phase detection module detection motor load electric current Point phase place also exports;First controllable silicon SCR 1 is connected to motor AC power supply ACL and the voltage input end of motor rotating forward Between ACK1;The trigger electrode of the first drive circuit output drive signal to the first controllable silicon SCR 1, triggers the first controllable silicon SCR 1 Conducting;Second controllable silicon SCR 2 is connected between motor AC power supply ACL and the voltage input end ACK2 of motor reversal;The The trigger electrode of two drive circuit output drive signals to the second controllable silicon SCR 2, triggers the second controllable silicon SCR 2 and turns on;MCU controls The phase voltage phase detection signal of device input phase voltage phase detecting module output and the electric current of current phase detection module output Phase detection signal also processes, and exports the first control signal H1 to the first drive circuit, controls the first controllable silicon SCR 1 The angle of flow, thus control the input voltage that motor rotates forward, or output the second control signal H2 to the second drive circuit, control second The angle of flow of controllable silicon SCR 2, thus control the input voltage of motor reversal.
As shown in Figure 6, the first drive circuit of embodiment and the second drive circuit, arbitrary drive circuit includes audion Q1, photoelectrical coupler IC1 and current-limiting resistance R2, R3, R4, current-limiting resistance R4 is connected to MCU controller and the base stage of audion Q1 Between, current-limiting resistance R3 is connected between the colelctor electrode of audion Q1 and the input of photoelectrical coupler IC1, and current-limiting resistance R2 goes here and there It is connected on the outfan of photoelectrical coupler IC1, the trigger electrode of this photoelectrical coupler IC1 output drive signal to controllable silicon SCR, triggers Controllable silicon SCR turns on.First controllable silicon SCR 1 and the second controllable silicon SCR 2 of embodiment, arbitrary controllable silicon SCR two ends connect RC Absorbing circuit, this RC absorbing circuit comprises the resistance R1 and electric capacity C1 being connected in series, is used for protecting controllable silicon SCR reliability service. Controllable silicon SCR is switching device, MCU controller output control signal H, triggers controllable silicon SCR conducting through drive circuit.Such as Fig. 6 Shown in, when control signal H is high level, audion Q1 turns on, and photoelectrical coupler IC1 turns on, and drives controllable silicon SCR conducting, Motor obtains electric operation;When control signal H is low level, audion Q1 ends, and photoelectrical coupler IC1 ends, and controllable silicon SCR exists Cut-off near zero potential point, motor power-off is out of service.Adjust the time point of MCU controller output high-level control signal H, i.e. Adjustable triggers the time point of controllable silicon SCR conducting, and adjusts the size of the controllable silicon SCR angle of flow, just can adjust electric moter voltage The input voltage size of input ACK.
As in figure 2 it is shown, be the control flow chart of embodiment, when specified rate φ 0 is motor belt motor nominal load, motor AC supplies Electricity power supply zero potential point phase place and the difference of motor load current zero current point phase place, actual test obtains;Detection limit φ c is phase The motor AC power supply zero potential point phase place that voltage-phase detection module detects detects with current phase detection module The difference of motor load current zero current point phase place, preferable optimal noise is that detection limit φ c is equal to specified rate φ 0.MCU controls Device sends the control signal at controllable silicon initial turn-on angle, and through drive circuit to controllable silicon SCR, controllable silicon SCR is according to MCU controller Control signal open the corresponding angle of flow and power to motor, phase voltage phase detecting module and current phase detection module conduct Detection device, the zero potential point phase place of detection power supply and the zero-current point phase place of load current, feed back to MCU controller, MCU is controlled Device processed is through comparison process, if φ is c > φ 0, illustrate that power-factor angle is too big, motor institute bringing onto load is too small, motor torque mistake Greatly, rotating speed is too high, it is desirable to reduce the input voltage of motor, then gradually reduce thyristor operating angle, until the deviation of φ c Yu φ 0 In allowed band, if the deviation of φ c Yu φ 0 is in allowed band, it is maintained for the angle of flow that controllable silicon is current, keeps motor Current input voltage, if φ is c, < φ 0, then explanation motor input voltage is too low, and motor torque is too small, and rotating speed is too low, needs Increase motor input voltage, then be stepped up the silicon controlled angle of flow, until the deviation of φ c Yu φ 0 in allowed band or Person is adjusted to the angle of flow of maximum.As shown in Figure 3 and Figure 4, represent that load is for load current and electricity during underloading and during nominal load The phase diagram of source voltage, owing to alternating current generator is inductive load, so current lagging voltage, when during underloading, φ c is than nominal load φ 0 is big, and φ c is the biggest, and power factor is the lowest, and motor institute bringing onto load is the lightest.As it is shown in figure 5, U1-t is source voltage curve figure, A1, A2, A3 are zero potential point, and B1, B2, B3, C1, C2, C3 are approximation zero potential point, and U2-t is that the voltage after all wave rectification is bent Line chart, U3-t is the curve chart of the phase voltage phase detection signal of phase voltage phase detecting module output, can from U3-t Arriving, communication power supply U1 is interval at C1 to B1, and MCU controller detects high level, in C1 point position, detect low level to High level saltus step, in B1 point position, detect high level to low transition, the time span of C1 to B1 be exactly high level time Between length a, can test and obtain, the zero potential point phase place of communication power supply is exactly a/2 location point, and the saltus step of level is the most permissible Detected by MCU controller.Current phase is detected by current phase detection module, in I-t curve chart, and D1, D2, D3 table Show that the zero-current point of load current, communication power supply zero potential point are tc with time difference A11-D1 of load current zero-current point MS, the frequency of mains supply is 50HZ, cycle T=20MS, and corresponding angle is 360 °, then φ c=tc/20*360 °.According to The control characteristic of bidirectional triode thyristor no-voltage cut-off, controllable silicon is controlled in B1-C2, B2-C3 section, to the trigger electrode of bidirectional triode thyristor Sending one and trigger pulse b, trigger bidirectional triode thyristor conducting, for ease of contrast sequential, this triggering pulse b is marked in U3-t, can Control silicon, in A11-A12 mains half-cycle, turns in E-A12 section, and A11-E section is ended, and is also similar control at other voltage half cycle System.Regulation triggers the time point E of controlled silicon conducting, it is simply that the size of regulation thyristor operating angle, thus regulates the input of motor Voltage.
If silicon controlled initial turn-on angle is set as 80% conducting of civil power half period, then MCU controller sends The control signal at controllable silicon initial turn-on angle, can be after time point communication power supply zero potential point being detected, time delay 2MS, sends control signal, triggers controlled silicon conducting through drive circuit, and the civil power half period is 10MS, then silicon controlled ON time It is 8MS.Progressively reduce or be stepped up the silicon controlled angle of flow, as a example by being stepped up the silicon controlled angle of flow, such as setting value For the 1% of the civil power half period, i.e. 0.1MS, then regulate by this setting value, the silicon controlled angle of flow is stepped up, it is simply that: controllable silicon ON time press 8.1MS, 8.2MS, 8.3MS ... be stepped up, until the motor that phase voltage phase detecting module detects The motor load current zero current point phase place that communication power supply zero potential point phase place and current phase detection module detect Difference φ c, level off to motor belt motor nominal load time motor AC power supply zero potential point phase place and motor load current zero electricity Difference φ 0 of flow point phase place, or increase to adjustable maximum conduction angle.For making governing speed faster, it is also possible to be: just open Begin by bigger setting value, as regulated by the speed of the 5% of civil power half period, i.e. 0.5MS, close to again by less setting value Regulation, as regulated by the speed of the 1% of civil power half period, i.e. 0.1MS, until the motor that phase voltage phase detecting module detects The motor load current zero current point phase place that communication power supply zero potential point phase place and current phase detection module detect Difference ф c level off to motor belt motor nominal load time motor AC power supply zero potential point phase place and motor load current zero electric current Difference φ 0 of some phase place, or increase to adjustable maximum conduction angle.The zero potential point phase place of motor AC power supply is used The zero potential point time value of motor AC power supply represents, the zero-current point phase place motor load current of motor load electric current Zero-current point time value represent, equally, specified rate φ 0 be with during motor belt motor nominal load motor AC power supply zero electricity Gesture point time value represents with the difference of the zero-current point time value of load current, and the detection limit φ c that MCU controller obtains is with phase The zero potential point time value of the motor AC power supply that voltage-phase detection module detects is examined with current phase detection module The difference of the zero-current point time value of the load current measured represents.
Motor runs under rated voltage, nominal load, and noise is minimum.
Due to the fact that and be provided with MCU controller, and be provided with detection device, i.e. phase voltage phase detecting module and electric current Phase detecting module, therefore MCU controller can detect phase place and the phase of motor load electric current of motor AC power supply automatically Position, carries situation by its actual band of phase difference detection motor, and carries situation according to the actual band of motor, send control signal, control The size of thyristor operating angle processed, thus control the size of motor input voltage, make the stabilization of speed of motor, it is ensured that power of motor Factor levels off to the motor power factor under nominal load, makes motor operate in optimum state, reduces and produces due to load change Raw noise, saves the energy simultaneously.
In sum, a kind of motor noise-reducing control method applied on intelligence clothes airing machine of the present invention, comprise the following steps:
1) specified rate φ 0, motor AC power supply zero potential point when this specified rate φ 0 is motor belt motor nominal load are set Phase place and the difference of motor load current zero current point phase place, this specified rate φ 0 is obtained by reality test;
2) MCU controller output controllable silicon initial turn-on angle control signal, triggers controllable silicon by initially leading through drive circuit Current flow angle turns on, thus controls the initial input voltage of motor;
3) phase voltage phase detection signal and the current phase of MCU controller input phase voltage phase detecting module output is examined Surveying the current phase detection signal of module output, obtaining detection limit φ c, this detection limit φ c is the inspection of phase voltage phase detecting module The motor load current zero electricity that motor AC power supply zero potential point phase place and the current phase detection module measured detects The difference of flow point phase place, detection limit φ c and specified rate φ 0 is compared process, comprises by MCU controller:
If detection limit φ c is more than specified rate φ 0, then under MCU controller controls, progressively reduce silicon controlled conducting Angle, thus progressively reduce the input voltage of motor, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band;
If the deviation of detection limit φ c and specified rate φ 0 is in allowed band, then under MCU controller controls, controllable silicon Turn on by the current angle of flow, keep the present input voltage of motor;
If detection limit φ c is less than specified rate φ 0, then under MCU controller controls, incrementally increase silicon controlled conducting Angle, thus incrementally increase the input voltage of motor, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band, or Till the silicon controlled angle of flow is adjusted to maximum conduction angle.
Described progressively reduce or be stepped up the silicon controlled angle of flow, for: successively decrease by setting value or be incremented by silicon controlled and lead Current flow angle, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band.
Described progressively reduce or be stepped up the silicon controlled angle of flow, for: first successively decreasing by bigger setting value or be incremented by can The angle of flow of control silicon, when the deviation of detection limit φ c and specified rate φ 0 is in allowed band, then is passed by less setting value Subtract or be incremented by the silicon controlled angle of flow, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band.

Claims (6)

1. the motor noise-reducing control circuit applied on intelligence clothes airing machine, it is characterised in that: include MCU controller, mutually electricity Press phase detecting module, current phase detection module, the first drive circuit, the first controllable silicon, the second drive circuit and second can Control silicon;
Phase voltage phase detecting module, detects the zero potential point phase place of motor AC power supply and exports;
Current phase detection module, detects the zero-current point phase place of motor load electric current and exports;
First controllable silicon, is connected between the voltage input end of motor AC power supply and motor rotating forward;
First drive circuit;Output drive signal is to the first silicon controlled trigger electrode;
Second controllable silicon, is connected between motor AC power supply and the voltage input end of motor reversal;
Second drive circuit;Output drive signal is to the second silicon controlled trigger electrode;
MCU controller, the phase voltage phase detection signal of input phase voltage phase detecting module output and current phase detection mould The current phase of block output detects signal and processes, and output first controls signal to the first drive circuit, and controlling first can The angle of flow of control silicon, thus control the input voltage that motor rotates forward, or output second controls signal to the second drive circuit, controls The second silicon controlled angle of flow, thus control the input voltage of motor reversal.
Control circuit the most according to claim 1, it is characterised in that: described first drive circuit and the second drive circuit, Arbitrary drive circuit includes that audion Q1, photoelectrical coupler IC1 and current-limiting resistance R2, R3, R4, described current-limiting resistance R4 are connected to Between the base stage of MCU controller and audion Q1, described current-limiting resistance R3 is connected to colelctor electrode and the photoelectric coupling of audion Q1 Between the input of device IC1, described current-limiting resistance R2 is serially connected in the outfan of photoelectrical coupler IC1, and IC1 is defeated for this photoelectrical coupler Go out to drive signal to silicon controlled trigger electrode, trigger controlled silicon conducting.
Control circuit the most according to claim 1, it is characterised in that: described first controllable silicon and the second controllable silicon, arbitrary Controllable silicon two ends connect RC absorbing circuit, and this RC absorbing circuit comprises the resistance R1 and electric capacity C1 being connected in series.
4. the motor noise-reducing control method applied on intelligence clothes airing machine, it is characterised in that: comprise the following steps:
1) specified rate φ 0, motor AC power supply zero potential point phase place when this specified rate φ 0 is motor belt motor nominal load are set With the difference of motor load current zero current point phase place, this specified rate φ 0 is obtained by reality test;
2) MCU controller output controllable silicon initial turn-on angle control signal, triggers controllable silicon through drive circuit and presses initial turn-on angle Conducting, thus control the initial input voltage of motor;
3) phase voltage phase detection signal and the current phase of MCU controller input phase voltage phase detecting module output detects mould The current phase detection signal of block output, obtaining detection limit φ c, this detection limit φ c is that phase voltage phase detecting module detects The motor load current zero current point that detects with current phase detection module of motor AC power supply zero potential point phase place The difference of phase place, detection limit φ c and specified rate φ 0 is compared process, comprises by MCU controller:
If detection limit φ c is more than specified rate φ 0, then under MCU controller controls, progressively reduce the silicon controlled angle of flow, from And progressively reduce the input voltage of motor, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band;
If the deviation of detection limit φ c and specified rate φ 0 is in allowed band, then under MCU controller controls, controllable silicon is by working as The front angle of flow turns on, and keeps the present input voltage of motor;
If detection limit φ c is less than specified rate φ 0, then, under MCU controller controls, incrementally increase the silicon controlled angle of flow, from And incrementally increase the input voltage of motor, until the deviation of detection limit φ c and specified rate φ 0 is in allowed band, or until Till the silicon controlled angle of flow is adjusted to maximum conduction angle.
Motor noise-reducing control method the most according to claim 4, it is characterised in that: described progressively reduce or be stepped up can The angle of flow of control silicon, for: successively decrease by setting value or be incremented by the silicon controlled angle of flow, until detection limit φ c and specified rate φ's 0 is inclined Difference is in allowed band.
Motor noise-reducing control method the most according to claim 4, it is characterised in that: described progressively reduce or be stepped up can The angle of flow of control silicon, for: first successively decrease by bigger setting value or be incremented by the silicon controlled angle of flow, when detection limit φ c and specified rate The deviation of φ 0 is in allowed band, then successively decreases by less setting value or be incremented by the silicon controlled angle of flow, until detection limit The deviation of φ c and specified rate φ 0 is in allowed band.
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CN108063570A (en) * 2018-01-22 2018-05-22 安图实验仪器(郑州)有限公司 Stepper motor torque self_adaptive adjusting system
CN110658855A (en) * 2019-09-12 2020-01-07 九牧厨卫股份有限公司 Airing machine stroke control method

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