CN208433925U - A kind of speed Control of Induction Motor device - Google Patents
A kind of speed Control of Induction Motor device Download PDFInfo
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- CN208433925U CN208433925U CN201821052971.0U CN201821052971U CN208433925U CN 208433925 U CN208433925 U CN 208433925U CN 201821052971 U CN201821052971 U CN 201821052971U CN 208433925 U CN208433925 U CN 208433925U
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Abstract
The utility model discloses a kind of speed Control of Induction Motor devices, including driving voltage controlling circuit, voltage detecting circuit, thyristor state detection circuit, microprocessor；Driving voltage controlling circuit includes thyristor comprising first switch circuit is connected between AC power source and machine winding；Voltage detecting circuit is in parallel with AC power source, detects its instantaneous voltage；Thyristor state detection circuit is connect with the both ends of first switch circuit respectively, detects the on-off angle of thyristor；Microprocessor is connect with driving voltage controlling circuit, voltage detecting circuit, thyristor state detection circuit respectively, receives instantaneous voltage, on-off angle and control thyristor on-off；Microprocessor is stored with voltage-revolving speed and corresponds to table, target drives voltage is searched by rotating speed of target, in conjunction with the driving voltage in the current speed regulation period that the instantaneous voltage by currently adjusting the speed the period, on-off angle obtain, the on-off angle in next speed regulation period is calculated to control thyristor on-off.
Description
Technical field
The utility model belongs to asynchronous motor drive technical field, specifically, being to be related to a kind of Rotational Speed of Asynchronous Motor control
Device processed.
Background technique
The control of threephase asynchronous machine revolving speed mainly includes frequency conversion, pole-changing and change three kinds of modes of speed regulation of revolutional slip.Frequency conversion tune
Speed is to be controlled by changing the frequency of motor power voltage the revolving speed of motor, and being most directly is also current most popular tune
Fast mode.But main control unit is I GBT, and needs first to rectify, pressure stabilizing, then carry out inversion, therefore there are costs
Height, circuit are complicated, high failure rate, the disadvantages of CPU usage is high.Pole-changing control is changed with the mode of connection for changing stator winding
The stator number of pole-pairs of cage electromotor realizes that the speed regulation of motor has good stability with harder mechanical property.But
For step speed regulation, and it is differential larger, stepless speed control cannot be obtained.Changing revolutional slip speed regulation includes variable voltage control, coiling electric motor turn
Substring rheostatic speed regulation and winding motor cascade control.Rotor string resistance, string inductance etc. change the speed regulation side of motor characteristic curve
That there is also circuits is complicated, with high costs, maintenance is stranded for the mechanical speed regulation method of the change revolving speed transmission characteristic such as formula and excitation speed regulation
The disadvantages of difficult.Variable voltage control, predominantly multistage transformer or thyristor change the voltage at motor stator winding both ends and change
Rotating torque, and then realize the mode of speed regulation of adjustment revolving speed.
Thyristor in above-mentioned variable voltage control belongs to half control device, is usually used in the soft start field of motor, because its control is defeated
Precision is poor out, output directly affected by input voltage, power-factor of load fluctuation, make the speed regulating control precision of motor compared with
Difference, so, present people seldom pay close attention to motor thyristor voltage regulation rate controlling.But thyristor development experience over half a century, valence
Lattice are cheap, and driving circuit is simple, and especially in high pressure field, with the incomparable advantage of IGBT, reliable performance is controlled to whole
The demand of a cpu resource is also few.
Utility model content
The utility model provides a kind of speed Control of Induction Motor device, improves the precision of voltage and speed governing by transistor, cost compared with
Low, CPU usage is lower.
In order to solve the above technical problems, the utility model is achieved using following technical scheme:
A kind of speed Control of Induction Motor device, the asynchronous machine include machine winding, are connect with AC power source, special
Sign is, comprising:
Driving voltage controlling circuit comprising thyristor；The thyristor includes first switch circuit, is connected on described
Between AC power source and the machine winding, the on-off for controlling the AC power source and the machine winding makes the machine winding
Load driver voltage；
Voltage detecting circuit is connect with the firewire of the AC power source and zero curve respectively, detects the AC power source
Instantaneous voltage；
Thyristor state detection circuit connect with the both ends of the first switch circuit respectively, detects the thyristor
On-off angle；
Microprocessor, respectively with the driving voltage controlling circuit, the voltage detecting circuit, the thyristor state
Detection circuit connection receives the instantaneous voltage, the on-off angle and the control thyristor on-off；The microprocessor is deposited
It contains multiple driving voltage values and corresponds to voltage-revolving speed of the revolving speed under certain loads and correspond to table, and described in being searched as rotating speed of target
Voltage-revolving speed corresponds to table and obtains target drives voltage；The microprocessor is by currently adjusting the speed the instantaneous voltage, described in period
On-off angle calculation obtains the driving voltage in current speed regulation period, by the driving voltage, described for currently adjusting the speed the period
Target drives voltage carries out that the on-off angle in next speed regulation period is calculated and controls the thyristor on-off adjustment
The driving voltage in next speed regulation period.
In order to make motor speed fast and stable, the current driving voltage for adjusting the speed the period, the target drives voltage are logical
Pid control algorithm is crossed the target output voltage in next speed regulation period is calculated and is calculated by the target output voltage
The on-off angle in next speed regulation period.
Since AC power source is sine-wave power, the virtual value of half cycle is equal, to improve speed regulation accuracy, the speed regulation week
The size of phase is the half in the period of the AC power source.
Preferably, it includes 1000 that the voltage-revolving speed, which corresponds to the driving voltage value of table, and each driving voltage value is in
Using 0 be minimum value, the voltage effective value of standard AC power supply it is effective as the voltage of maximum value, the 1 ‰ standard AC power supply
Value is the arithmetic progression of tolerance.
In order to improve microprocessor calculating speed and working efficiency, the microprocessor is also stored with multiple angles in 0~π
Angle-the voltage for spending the virtual value of corresponding standard AC power supply integral corresponds to table, for calculating the driving voltage in speed regulation period；Respectively
The angle be in using 0 be minimum value, π as maximum value, 1 ‰ * π be the arithmetic progression of tolerance.
In order to improve microprocessor calculating speed and working efficiency, the microprocessor is also stored with more in 0~220V
Voltage-angle that a voltage corresponds to angle of flow corresponds to table, for calculating the corresponding angle of flow of the target output voltage；Each institute
State voltage be in using 0 be minimum value, arithmetic progression of the 220V as maximum value, 1 ‰ * 220V for tolerance.
A kind of specific circuit design as the voltage detecting circuit comprising:
First current-limiting resistance,
Voltage transformer comprising primary coil, secondary coil；The primary coil includes first end, second end；It is described
Secondary coil includes third end, the 4th end；The primary coil is exchanged with described respectively after connecting with first current-limiting resistance
The firewire of power supply is connected with zero curve；
Rectification circuit comprising first input end, the second input terminal, the first output end；The first input end, described
Two input terminals are connect with the third end, the 4th end respectively；First output end is connect with the microprocessor.
As a kind of specific circuit design of the thyristor state detection circuit, the thyristor state-detection electricity
Road includes the second current-limiting resistance, regulator rectifier circuit, controllable switch element, output circuit；The controllable switch element includes the
Five ends, the 6th end, the second control terminal；The regulator rectifier circuit includes third input terminal, the 4th input terminal, second output terminal；
One end of second current-limiting resistance is connect with the third input terminal, and the other end and the 4th input terminal are respectively with described
The both ends of one switching circuit connect；The second output terminal is connect with second control terminal；5th end and the described 6th
End respectively with the output circuit, connect；The output circuit is connect with the microprocessor；When the first switch circuit
When connection, the output circuit exports low level to the microprocessor；When the first switch circuit disconnects, the output
Circuit exports high level to the microprocessor.
Preferably, the controllable switch element is NPN type triode；The output circuit includes photoelectrical coupler；It is described
The circuit of LED of photoelectrical coupler is connect with the collector of the NPN type triode and low-tension supply anode respectively；Institute
State the emitter ground connection of NPN type triode；The transistor circuit of the photoelectrical coupler is connect with the microprocessor.
Preferably, the photoelectrical coupler is Quick photoelectric coupler.
Compared with prior art, the advantages and positive effects of the utility model are as follows: a kind of asynchronous machine of the utility model
Rotational speed governor and speed Control of Induction Motor method using technology maturation and cheap thyristor to motor stator around
The size of the voltage of group load is controlled, and is adjusted by the method for real-time tracking to its size, and motor speed is obtained
To accurate control, cost is relatively low, and the occupancy of CPU is lower.
Detailed description of the invention
Fig. 1 is a kind of composition block diagram of the embodiment for speed Control of Induction Motor device that the utility model is proposed；
Fig. 2 is the flow chart of the utility model speed Control of Induction Motor method；
Fig. 3 is the schematic diagram of the waveform of the voltage and current at asynchronous machine stator winding both ends；
Fig. 4 is driving voltage controlling circuit；
Fig. 5 is voltage detecting circuit；
Fig. 6 is thyristor state detection circuit；
Fig. 7 is power supply and zero cross detection circuit.
In figure,
W1, AC power source W phase；V1, AC power source V phase；U1, AC power source U phase；N1, AC power source zero curve；PE, ground wire；
W1 ', motor driven voltage W phase incoming end；V1 ', motor driven voltage V phase incoming end；U1 ', motor driven voltage U phase access
End；
1, driving voltage controlling circuit；2, voltage detecting circuit；3, thyristor state detection circuit；4, microprocessor；
Q001, thyristor；001, first switch circuit；002, the first control terminal；CTRL_U, the control of microprocessor thyristor
Interface；CN001, motor terminals；
R101, the first current-limiting resistance；T101, voltage transformer；D101, rectification circuit；C101, decoupling capacitor；CN101,
AC power source incoming end；V-AC, A D interface；101, first end；102, second end；103, third end；104, the 4th end；105,
First input end；106, the second input terminal；107, the first output end；
R201, the second current-limiting resistance；R202, first resistor；R203, second resistance；R204,3rd resistor；R205, the 4th
Resistance；R206, the 5th resistance；D201, regulator rectifier circuit；D202, first diode；D203, the second diode；D204,
Three diodes；C201, first capacitor；C202, the second capacitor；C203, third capacitor；Q201, controllable switch element；It is S201, defeated
Circuit out；PC201, photoelectrical coupler；Uon, thyristor on-off signal receiving interface；201, third input terminal；202, the 4th is defeated
Enter end；203, second output terminal；204, the second control terminal；205, the 5th end；206, the 6th end；207, low-voltage power circuit；
T301, step-down transformer；RN, corresponding zero line side；RL, corresponding zero line；PC302, voltage comparator；ZERO_R,
AC power supply zero point signaling interface；R302, the first partial pressure divider resistance；R303, the second divider resistance；R304, third partial pressure electricity
Resistance；R305, pull-up resistor；R306, third current-limiting resistance；C306, the 4th capacitor.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein to beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
Asynchronous machine includes stator winding, firewire and the zero curve connection at both ends and AC power source.Referring to Fig.1, Fig. 2, figure
3, Fig. 4, Fig. 5 and Fig. 6, a kind of speed Control of Induction Motor device include driving voltage controlling circuit 1, voltage detecting circuit 2, brilliant lock
Pipe state detection circuit 3, microprocessor 4.Driving voltage controlling circuit 1 includes thyristor Q001, and thyristor Q001 includes first
Switching circuit 001 and the first control terminal 002.First switch circuit 001 is connected between stator winding and the firewire of AC power source,
For controlling the on-off of AC power source and stator winding, to control the driving voltage loaded on stator winding, and then control
Motor speed.First control terminal 002 is connected to microprocessor 4, is exported control signal by microprocessor 4 and is controlled first switch circuit
001 on-off.Voltage detecting circuit 2 is connect with the firewire of AC power source and zero curve respectively, detects the instantaneous voltage of AC power source.
Thyristor state detection circuit 3 is connect with the both ends of first switch circuit 001 respectively, detects the on-off of first switch circuit 001
Angle.0 is stored in microprocessor 4 to multiple driving voltage values and corresponding between the voltage effective value of standard AC power supply
Voltage-revolving speed of revolving speed under the certain loads of asynchronous machine corresponds to table.And if voltage-revolving speed corresponds to the driving voltage in table
The number of value is enough, then forms voltage and revolving speed corresponding relationship curve.Microprocessor 4 respectively with voltage detecting circuit 2, brilliant lock
Pipe state detection circuit 3 connects, and receives the instantaneous voltage signal of voltage detecting circuit 2 and the on-off angle of first switch circuit 001
The signal of degree, and pass through the driving voltage at the stator winding both ends in integral calculation one speed regulation period.When microprocessor 4 receives
The control instruction of rotating speed of target, inquiry voltage-revolving speed correspond to table and obtain the corresponding driving voltage of rotating speed of target, i.e. target drives electricity
Pressure.Microprocessor 4 is calculated by target drives voltage and the driving voltage in current speed regulation period by control algolithm next
The angle of flow of period thyristor Q001 is adjusted the speed, and the on-off of thyristor Q001 is controlled, so that stator winding be made to apply
Driving voltage.Likewise, the on-off angle of the thyristor Q001 in next one speed regulation period is by microprocessor 4 by next tune
The driving voltage and target drives voltage in fast period are calculated by control algolithm.Each speed regulation period adjusts drive in real time
Dynamic voltage, makes its infinite approach target drives voltage, accomplishes the accurate control of motor speed.Cost is relatively low, reduces microprocessor
Occupancy, improve the efficiency of microprocessor.
And speed Control of Induction Motor method is then the method for controlling number of revolution implemented on speed Control of Induction Motor device,
Include the following steps, referring to Fig. 2.
S1: by the way that the virtual value of standard AC voltage is divided into multiple electrical voltage points as the driving voltage of asynchronous machine
Revolving speed under method test asynchronous machine certain loads obtains voltage-revolving speed and corresponds to table.If the foot that the number of electrical voltage point is arranged
It is more than enough, that is, form voltage-revolving speed homologous thread.
S2: voltage-revolving speed is corresponded into table storage into microprocessor 4.
S3: it when microprocessor 4 receives the revolving speed control instruction of rotating speed of target, is corresponded in table in above-mentioned voltage-revolving speed
Search the value of the corresponding target drives voltage of rotating speed of target.
S4: microprocessor 4 receives the instantaneous voltage exported by voltage detecting circuit 2 and by thyristor state detection circuit 3
The on-off angle of the thyristor Q001 of detection；
S5: the instantaneous voltage and current tune for the AC power source that current speed regulation period received voltage detecting circuit 2 is tested
The on-off angle for the thyristor Q001 that fast period received thyristor state detection circuit 3 detects calculates current adjust by integrating meter
The driving voltage at the stator winding both ends in fast period.
S6: microprocessor 4 is calculated by the driving voltage of target drives voltage and current speed regulation period by control algolithm
The target output voltage in next speed regulation period out；
S7: the on-off angle of thyristor Q001 is calculated by target output voltage；
S8: on-off control is carried out to thyristor Q001 according to the on-off angle of thyristor Q001 to adjust next speed regulation week
The driving voltage of phase is close to the value of target drives voltage.
Repeat S3~S8, carry out next but one speed regulation the period target output voltage value equally pass through microprocessor 4 by
Target drives voltage and the driving voltage in next speed regulation period are calculated by control algolithm.Such loop control makes to different
The control of step motor speed forms real-Time Tracking Control, makes the driving voltage infinite approach target drives voltage at stator winding both ends
Value.It realizes the accurate control to Rotational Speed of Asynchronous Motor, while cost is relatively low, it is less to occupy microprocessor resources.
In the rotational speed governor and speed Control of Induction Motor method of above-mentioned asynchronous machine, due to the one of AC power source
The virtual value of the voltage of positive half cycle and negative half period in a period is equal, so the above-mentioned speed regulation period is set as AC power source
The half in period.
In order to make the revolving speed fast approaching rotating speed of target of asynchronous machine and more stable, microprocessor 4 is by target drives voltage
Next target output voltage for adjusting the speed the period, Jin Erji were obtained by pid control algorithm with the driving voltage in a upper speed regulation period
The on-off angle for calculating thyristor Q001 keeps the driving voltage at stator winding both ends fast to control the on-off of thyristor Q001
The value of quick access close-target driving voltage, achievees the purpose that revolving speed accurately controls.
Preferably, voltage-revolving speed correspond to each driving voltage of table be in using 0 be minimum value, 220V is maximum value, 1 ‰ *
220V is the arithmetic progression of tolerance.
In the particular embodiment, referring to Fig. 2 and Fig. 3, the calculating side of the virtual value of the driving voltage at stator winding both ends
Method is specific as follows.Because there is the phase of lag relative to the voltage of AC power source in the stator windings in the electric current of AC power source
Angle is respectively defined as t1, t2 so the angle of flow of thyristor Q001 is distributed in the two sides of AC supply voltage zero point.Pass through
Thyristor state detection circuit 3 determines the size of t1, t2, and t2 is the phase angle of lag.For the operation for mitigating microprocessor 4
Pressure and operation efficiency is improved, the corresponding standard AC power supply voltage of the more a points of 0~π of sinusoidal half cycle is stored in microprocessor 4
Under angle-voltage of virtual value correspond to table.Preferably, each point be in using 0 be minimum value, π as maximum value, 1 ‰ * π be tolerance
Arithmetic progression.It angle-voltage is searched by angle of flow t1, t2 corresponds to table and obtain virtual value under standard AC power supply voltage
Vt1, Vt2, then the virtual value that the driving voltage at stator winding both ends is loaded under standard AC power supply is Vt=Vt1+Vt2.
The voltage effective value of integral sine half cycle AC power source is URMS', the voltage effective value of standard AC power supply is URMS, by voltage
Virtual value calculation formula:
The voltage obtained under t1, t2 angle of flow is effective
The calculation formula of value are as follows:
UmFor the maximum value of AC power source,
The virtual value of voltage is related with the virtual value of angle of flow and AC power source as can be seen from the above equation, then,
Vt '=Vt*URMS′2/URMS 2
Vt ' is the driving voltage at the both ends of the stator winding in a speed regulation period；
The virtual value that Vt is angle of flow when being t1 and t2 under standard AC power source；
URMS' for one speed regulation the period AC power source virtual value；
URMSFor the virtual value of standard AC power supply.
By the virtual value V t ' of the driving voltage in current speed regulation period, pid control algorithm fortune is carried out with target drives voltage
It calculates.PID uses discrete increment formula pid algorithm, and each incremental computations formula is as follows:
△ u [n]=Kp{e[n]-e[n-1]}+Kie[n]+Kd{e[n]-2e[n-1]+e[n-2]}
Then, Uout=U [n-1]+Δ u
Δ u: this PID increment；
Kp: proportionality coefficient；
Ki: integral coefficient；
Kd: differential coefficient；
E [n]: current voltage error amount, for the driving voltage in current speed regulation period and the difference of target drives voltage；
E [n-1]: upper speed regulation periodic voltage error amount, the driving voltage for adjusting the speed the period for upper one and target drives electricity
The difference of pressure；
E [n-2]: it is upper to adjust the speed periodic voltage error amount, the driving voltage and target drives in period are adjusted the speed for upper one
The difference of voltage；
Uout: target output voltage；
U [n-1]: the target output voltage in a upper speed regulation period；
By obtaining the target output voltage in this speed regulation period after the on-off of PID calculating and control thyristor Q001, pass through
Formula:
Vout/URMS 2=Uout/URMS'2,
Vout=Uout × URMS 2/URMS'2
Vout is the output voltage under the corresponding standard AC power supply of number of targets voltage.By the virtual value of standard AC power supply
Multiple points are set, the value of its corresponding 0~π is calculated, formation voltage-angle of flow corresponds to table and is also stored into microprocessor 4.It is excellent
Choosing, each point be in using 0 be minimum value, 220V as maximum value, 1 ‰ * 220 be the arithmetic progression of tolerance.Then above-mentioned electricity is arrived
Pressure-angle of flow corresponds to the angle of flow that table searches the corresponding thyristor Q001 of Vout, then again by 0~π and sinusoidal half cycle when
Between it is corresponding, calculate the specific moment of thyristor Q001 conducting, control the conducting of thyristor Q001, realize that driving voltage is accurately controlled
System.
The embodiments of the present invention are illustrated by taking threephase asynchronous machine as an example, referring to Fig.1, Fig. 3, Fig. 4, Fig. 5, Fig. 6
And Fig. 7, CN001 are connecting terminal of motor, CN101 is AC power source incoming end.Specifically: W1 is AC power source W phase；V1 is to hand over
Galvanic electricity source V phase；U1 is AC power source U phase；N1 is AC power source zero curve；PE is ground wire；W1 ' is that motor driven voltage W phase accesses
End；V1 ' is motor driven voltage V phase incoming end；U1 ' is motor driven voltage U phase incoming end；Then the utility model is with three-phase
It is illustrated for the U phase U1 and zero curve N1 of AC power source and the U phase power supply of threephase asynchronous machine.In addition, microprocessor includes
Microprocessor thyristor control interface CTRL_U, A D interface V-AC, thyristor on-off signal receiving interface Uon, AC power source zero
Point signaling interface ZERO_R.
Referring to Fig. 5, voltage detecting circuit 2 includes the first current-limiting resistance R101, voltage transformer T101, rectification circuit
D101.Voltage transformer T101 is current mode voltage transformer comprising primary coil, secondary coil.Primary coil includes the
One end 101, second end 102.Secondary coil includes third end 103, the 4th end 104.Rectification circuit D101 includes first input end
105, the second input terminal 106, the first output end 107.The first end 101 and second end of the primary coil of voltage transformer T101
102 are separately connected the U phase U1 and zero curve N1 of AC power source.First current-limiting resistance R101 is connected on primary coil and AC power source
Connection in.Third end 103 and the 4th end 104 are separately connected first input end 105, the second input terminal 106, the first output end
The A D interface V-AC of 107 connection microprocessors 4, detects the instantaneous voltage of the U phase of the AC power source at each moment.Microprocessor 4
A D interface V-AC the ground of signal power source 3.3V is connect by decoupling capacitor C101.
Referring to Fig. 6, thyristor state detection circuit 3 includes the second current-limiting resistance R201, regulator rectifier circuit D201, the
One resistance R202, controllable switch element Q201 and output circuit S201.Regulator rectifier circuit D201 include third input terminal 201,
4th input terminal 202, second output terminal 203.Controllable switch element Q201 includes second switch circuit, the second control terminal 204.
Second switch circuit includes the 5th end 205, the 6th end 206.The both ends of second current-limiting resistance R201 respectively with first switch circuit
001 one end and third input terminal 201 connect.4th input terminal 202 is connect with the other end of first switch circuit 001.Second
Output end 203 is connect with one end of first resistor R202, and the other end of first resistor R202 is connect with the second control terminal 204.It is defeated
Circuit S201 is connect with the thyristor on-off signal receiving interface Uon of the 5th end 205, low-tension supply and microprocessor 4 respectively out.
6th end 206 ground connection.When first switch circuit 001 is connected to, output circuit S201 believes to the thyristor on-off of microprocessor 4
Number receiving interface Uon exports low level；When first switch circuit 001 disconnects, crystalline substance of the output circuit S201 to microprocessor 4
Brake tube on-off signal receiving interface Uon exports high level.Microprocessor 4 by it is received it is current speed regulation the period AC power source U
The on-off angle calculation of the instantaneous voltage of phase U1 and received thyristor Q001 obtain current speed regulation period load in stator winding
The driving voltage at both ends.
Referring to Fig. 6, it is preferred that controllable switch element Q201 is the triode of NPN type comprising base stage B, collector C,
Emitter E.Second output terminal 203 is connect by first resistor R202 with base stage B, and output circuit S201 is connect with collector C, hair
Emitter-base bandgap grading E ground connection.
Referring to Fig. 6, it is preferred that output circuit S201 includes Quick photoelectric coupler PC201, second resistance R203, third
Resistance R204, the 4th resistance R205, first diode D202, first capacitor C201.Luminous the two of Quick photoelectric coupler PC201
Pole pipe circuit is connected between collector C and the anode of low-tension supply 5V ' again after connecting with second resistance R203.Its triode electricity
Road part respectively with the anode of signal power source 5V, connect and by the thyristor on-off of 3rd resistor R204 and microprocessor believe
Number receiving interface Uon connection.Thyristor on-off signal receiving interface Uon passes through the 4th resistance R205's and first capacitor C201
Parallel circuit ground connection, and connect by first diode D202 with the anode of signal power source 3.3V, and first diode D202
Anode meets thyristor on-off signal receiving interface Uon, and cathode connects the anode of signal power source 3.3V.Pass through the fast of output circuit S201
Fast light-coupled isolation alternating current circuit and signal circuit avoid interference of the alternating current circuit to signal circuit.Pass through 3rd resistor R204,
Four resistance R205 and first diode D202 guarantee that thyristor on-off signal receiving interface Uon receives the low and high level of standard.
It is obtained referring to Fig. 6, above-mentioned low-tension supply 5V ' by low-voltage power circuit 207.Low-voltage power circuit 207 includes the
Five resistance R206, the second diode D203, third diode D204, the second capacitor C202, third capacitor C203.5th resistance
One end of R206 is connect with zero curve N1, and the other end is connect with the anode of the second diode D203, the cathode of the second diode D203
It is connect with one end of the cathode of third diode D204, the anode of the second capacitor C202, third capacitor C203.Third diode
The cathode of D204 is grounded after connecting with the other end of the cathode of the second capacitor C202, third capacitor C203.5th resistance R206 makees
With for current limliting, the second diode D203 effect is halfwave rectifier, and third diode D204 is zener diode, with the second capacitor
C202, third capacitor C203 make low-tension supply 5V ' stablize output together.
In addition, the utility model further includes zero cross detection circuit, referring to Fig. 7.It includes step-down transformer T301, voltage ratio
Compared with device PC302, the first partial pressure divider resistance R302, the second divider resistance R303, third divider resistance R304, pull-up resistor
R305, third current-limiting resistance R306, the 4th capacitor C306.The both ends of the primary coil of step-down transformer T301 respectively with alternating current
The U phase U1 in source is connected with zero curve N1, and secondary coil output includes corresponding zero line RL, corresponding zero line side RN, voltage side
To identical as U phase U1, zero curve N1 respectively.First partial pressure divider resistance R302, the second divider resistance R303, third divider resistance
R304 series connection, and third divider resistance R304 is between the first divider resistance R302 and the second divider resistance R303.First point
Press the first divider resistance R302 of the series circuit of divider resistance R302, the second divider resistance R303, third divider resistance R304
One end and corresponding zero line side RN connection, one end of the second divider resistance R303 and corresponding zero line RL connection.Voltage compares
Device PC302 includes positive voltage input terminal, negative voltage input, output end.Positive voltage input terminal and negative voltage input terminal connect respectively
It connects at the both ends of third divider resistance R304, and positive voltage input terminal and the second divider resistance R303 and third divider resistance
The common end of R304 connects, and the common end of negative voltage input terminal and the first divider resistance R302 and third divider resistance R304 connect
It connects.The output end of voltage comparator PC302 connects the anode of signal power source 3.3V by pull-up resistor R305, passes through third current limliting electricity
Hinder the AC power supply zero point signaling interface ZERO-R connection of R306 and microprocessor.The AC power supply zero point signal of microprocessor connects
Mouth ZERO-R connects the ground of signal power source 3.3V by the 4th capacitor C306.AC power supply zero point signal assists to determine thyristor Q001
The on-off moment and control thyristor Q001 on-off.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important
Property or implicitly indicate the quantity of indicated technical characteristic.The meaning of " plurality " is at least in the description of the present invention,
Two, such as two, three or more etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside element, unless otherwise restricted clearly.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (10)
1. a kind of speed Control of Induction Motor device, the asynchronous machine include machine winding, it is connect with AC power source, feature
It is, comprising:
Driving voltage controlling circuit comprising thyristor；The thyristor includes first switch circuit, is connected on the exchange
Between power supply and the machine winding, the on-off for controlling the AC power source and the machine winding loads the machine winding
Driving voltage；
Voltage detecting circuit is connect with the firewire of the AC power source and zero curve respectively, detects the instantaneous of the AC power source
Voltage；
Thyristor state detection circuit is connect with the both ends of the first switch circuit respectively, detects the logical of the thyristor
Angle of rupture degree；
Microprocessor, respectively with the driving voltage controlling circuit, the voltage detecting circuit, the thyristor state-detection
Circuit connection receives the instantaneous voltage, the on-off angle and the control thyristor on-off；The microprocessor is stored with
Voltage-revolving speed that multiple driving voltage values correspond to the revolving speed under certain loads corresponds to table, and searches the voltage-by rotating speed of target
Revolving speed corresponds to table and obtains target drives voltage；The microprocessor is by currently adjusting the speed the instantaneous voltage in period, the on-off
Angle calculation obtains the driving voltage in current speed regulation period, by currently adjusting the speed the driving voltage in period, the target
Driving voltage be calculated the on-off angle in next speed regulation period and to control the thyristor on-off adjustment next
The driving voltage in a speed regulation period.
2. speed Control of Induction Motor device according to claim 1, which is characterized in that the driving in current speed regulation period
Voltage, the target drives voltage by pid control algorithm be calculated it is next speed regulation the period target output voltage and by
The on-off angle in next speed regulation period is calculated in the target output voltage.
3. speed Control of Induction Motor device according to claim 1, which is characterized in that the size in the speed regulation period is institute
State the half in the period of AC power source.
4. speed Control of Induction Motor device according to claim 1, which is characterized in that the voltage-revolving speed corresponds to table
Driving voltage value includes 1000, and each driving voltage value is in 0 is minimum value, the voltage effective value of standard AC power supply
Voltage effective value for maximum value, the 1 ‰ standard AC power supply is the arithmetic progression of tolerance.
5. speed Control of Induction Motor device according to claim 1, which is characterized in that the microprocessor is also stored with 0 ~
Angle-voltage that multiple angles in π correspond to the virtual value of standard AC power supply integral corresponds to table, for calculating a speed regulation week
Driving voltage in phase；Each angle be in using 0 be minimum value, π as maximum value, 1 ‰ * π be the arithmetic progression of tolerance.
6. speed Control of Induction Motor device according to claim 2, which is characterized in that the microprocessor is also stored with 0 ~
Voltage-angle that multiple voltages in 220V correspond to angle of flow corresponds to table, corresponding for calculating the target output voltage
The angle of flow；Each voltage be in using 0 be minimum value, 220V as maximum value, 1 ‰ * 220V be the arithmetic progression of tolerance.
7. speed Control of Induction Motor device according to claim 1, which is characterized in that the voltage detecting circuit includes:
First current-limiting resistance,
Voltage transformer comprising primary coil, secondary coil；The primary coil includes first end, second end；The secondary
Coil includes third end, the 4th end；The primary coil connect with first current-limiting resistance after respectively with the AC power source
Firewire connected with zero curve；
Rectification circuit comprising first input end, the second input terminal, the first output end；It is the first input end, described second defeated
Enter end to connect with the third end, the 4th end respectively；First output end is connect with the microprocessor.
8. speed Control of Induction Motor device according to any one of claims 1 to 6, which is characterized in that the thyristor shape
State detection circuit includes the second current-limiting resistance, regulator rectifier circuit, controllable switch element, output circuit；The controllable switch member
Part includes the 5th end, the 6th end, the second control terminal；The regulator rectifier circuit includes third input terminal, the 4th input terminal, second
Output end；One end of second current-limiting resistance is connect with the third input terminal, the other end and the 4th input terminal difference
It is connect with the both ends of the first switch circuit；The second output terminal is connect with second control terminal；5th end and
6th end respectively with the output circuit, connect；The output circuit is connect with the microprocessor；When described first
When switching circuit is connected to, the output circuit exports low level to the microprocessor；When the first switch circuit disconnects,
The output circuit exports high level to the microprocessor.
9. speed Control of Induction Motor device according to claim 8, which is characterized in that the controllable switch element is NPN
Type triode；The output circuit includes photoelectrical coupler；The circuit of LED of the photoelectrical coupler respectively with it is described
The collector of NPN type triode is connected with low-tension supply anode；The emitter of the NPN type triode is grounded；The photoelectricity coupling
The transistor circuit of clutch is connect with the microprocessor.
10. speed Control of Induction Motor device according to claim 9, which is characterized in that the photoelectrical coupler is quick
Photoelectrical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821052971.0U CN208433925U (en) | 2018-07-04 | 2018-07-04 | A kind of speed Control of Induction Motor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821052971.0U CN208433925U (en) | 2018-07-04 | 2018-07-04 | A kind of speed Control of Induction Motor device |
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| Publication Number | Publication Date |
|---|---|
| CN208433925U true CN208433925U (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821052971.0U Withdrawn - After Issue CN208433925U (en) | 2018-07-04 | 2018-07-04 | A kind of speed Control of Induction Motor device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108616232A (en) * | 2018-07-04 | 2018-10-02 | 青岛海信电子设备股份有限公司 | A kind of speed Control of Induction Motor device and speed Control of Induction Motor method |
-
2018
- 2018-07-04 CN CN201821052971.0U patent/CN208433925U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108616232A (en) * | 2018-07-04 | 2018-10-02 | 青岛海信电子设备股份有限公司 | A kind of speed Control of Induction Motor device and speed Control of Induction Motor method |
| CN108616232B (en) * | 2018-07-04 | 2024-01-09 | 青岛海信网络能源股份有限公司 | Asynchronous motor rotating speed controller and asynchronous motor rotating speed control method |
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