CN109802621A - A kind of alternating current generator stepless time adjustment control circuit based on potentiometer control - Google Patents
A kind of alternating current generator stepless time adjustment control circuit based on potentiometer control Download PDFInfo
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- CN109802621A CN109802621A CN201811589133.1A CN201811589133A CN109802621A CN 109802621 A CN109802621 A CN 109802621A CN 201811589133 A CN201811589133 A CN 201811589133A CN 109802621 A CN109802621 A CN 109802621A
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Abstract
The present invention relates to a kind of alternating current generator stepless time adjustment control circuits based on potentiometer control, including main circuit, the step-down transformer for being connected in parallel on main circuit input terminal, given circuit, speed measure feedback circuit, trigger circuit and motor, main circuit input terminal is line voltage, and speed measure feedback circuit includes tachometer generator F, the second rectification circuit, filter capacitor C5, signal acquisition potentiometer and correcting potential device and is sequentially connected；The voltage of intermediate frequency that the present invention is exported by tachometer generator is sampled feedback voltage signal by the centre tap of signal acquisition potentiometer after speed measure feedback processing of circuit, its difference enters preamplifier T1 and amplifies processing compared with the DC voltage of given circuit output again, silicon-controlled pilot angle also changes therewith, realizes the stepless time adjustment of wide scope to motor by electromagnetic slip clutches；And resistance used in the alignment circuit is minimum, electric energy loss very little, the stepless time adjustment occasion suitable for ac motor.
Description
Technical field
The present invention relates to AC Motor Control technical field more particularly to a kind of alternating currents based on potentiometer control
Machine stepless time adjustment control circuit.
Background technique
Existing alternating current generator needs to carry out speed regulation operation in use, generally according to the load of situ configuration, but
It is in practical applications, following mode of speed regulation to be mostly used to be adjusted the speed greatly, such as: 1, using frequency converter change supply frequency and adjust the speed,
Speed adjustable range is big, and stability flatness is preferable, and mechanical property is harder, belongs to stepless time adjustment, and it is different to be suitable for most of three-phase squirrel cage
Motor is walked, but the price of frequency converter is more expensive, and big failure once occurs, then needs replacing frequency converter, it is uneconomical；2, lead to
Cross rotor loop string resistance: for AC Asynchronous motor, but speed adjustable range is small, the resistance power to be consumed, electricity
The efficiency of machine is relatively low；Such as the patent No.: CN201410241722.6, a kind of patent name: winding motor rotor string resistance
Speed-measuring method and tachometer circuit in dynamic, although can adjust the speed and test the speed, due to string resistance, there are electric energy losses；On therefore
It states mode of speed regulation and does not adapt to some occasions for needing speed-regulating range width, therefore, the prior art is defective, needs to improve.
Summary of the invention
The present invention provides a kind of alternating current generator stepless time adjustment control circuit based on potentiometer control, and the above-mentioned of solution is asked
Topic.
To solve the above problems, technical solution provided by the invention is as follows:
It is a kind of based on potentiometer control alternating current generator stepless time adjustment control circuit, including main circuit, be connected in parallel on main circuit input
Step-down transformer B, given circuit, speed measure feedback circuit, trigger circuit and the motor at end, the input terminal of the main circuit are city
Electric 220V, given circuit include the first output end, the first rectification circuit, filter circuit, voltage regulator circuit and the tune of step-down transformer B
Piezoelectric position device W1；Speed measure feedback circuit includes tachometer generator F, the second rectification circuit, filter capacitor C5, signal acquisition potentiometer
W2 and correcting potential device W4;Trigger circuit includes the second output terminal of step-down transformer B, third rectification circuit, clipping circuit, puts
Big charging circuit, unijunction transistor T2, pulse transformer MB, silicon controlled rectifier protecting circuit；
Single-phase switch and fuse are set on the firewire of the main circuit, and the first output end of step-down transformer B exports alternating current
Input voltage of the 40V as given circuit is pressed, the input voltage of given circuit is in parallel with the first rectification circuit for that will input electricity
Repoussage stream, is changed into straight DC voltage using filter circuit, after filter circuit is first in parallel with voltage regulator circuit again with pressure regulation
The both ends of potentiometer W1 are in parallel, and the DC voltage of the middle slip end output of pressure regulation potentiometer W1 is given voltage and fills with amplification
Circuit electrical connection；
Tachometer generator F output three-phase mid-frequency voltage successively with the second rectification circuit, filter capacitor C5, signal acquisition potentiometer
W2 is in parallel, and the filtered feedback voltage signal of filter capacitor C5 is added to the both ends of signal acquisition potentiometer W2, signal acquisition current potential
The centre tap of device W2 is sampled feedback voltage signal and is electrically connected with the emitter of unijunction transistor T2；Correcting potential device
The both ends of the both ends parallel filtering capacitor C5 of W4, and the centre tap of correcting potential device W4 is by revolution counter n and signal acquisition electricity
The second end electrical connection of position device W2；
Input voltage of the second output terminal output AC voltage 55V of step-down transformer B as trigger circuit, trigger circuit it is defeated
It is successively in parallel with third rectification circuit, clipping circuit and amplification charging circuit to enter voltage, amplifies the output end and list of charging circuit
The emitter of junction transistors T2 is electrically connected, and unijunction transistor T2 is successively electrically connected with pulse transformer MB, silicon controlled rectifier protecting circuit,
Silicon controlled rectifier protecting circuit is connect by electromagnetic slip clutches coil with motor.
Preferably, first rectification circuit includes diode D6, diode D7, diode D8, diode D9, and described two
It is in parallel with the diode D8 of series connection, diode D9 again after pole pipe D6 and diode D7 series connection；Filter circuit includes by being electrolysed
The RC filter of capacitor C3, C4 and resistance R7 composition；Voltage regulator circuit includes voltage-stabiliser tube DW3 and DW4 and the two is connected in parallel.
Preferably, second rectification circuit includes by diode D11 and concatenated first series circuit of D12, by two poles
Pipe D13 and concatenated second series circuit of D14 and by diode D15 and the concatenated third series circuit of D16, and first, second,
Third series circuit is connected in parallel.
Preferably, third rectification circuit includes diode D2, diode D3, diode D4, diode D5, the diode
It is in parallel with the diode D4 of series connection, diode D5 again after D2 series diode D3；The clipping circuit includes voltage-stabiliser tube DW1
With DW2 and the two is connected in parallel；The amplification charging circuit includes resistance R3, resistance R5, resistance R6, capacitor C2, potentiometer W3
It is electrically connected by resistance R3 with the cathode of diode D2 with the collecting zone of preamplifier T1, the preamplifier T1, it is preposition
The base area of amplifier T1 is electrically connected by resistance R5 with the first end of potentiometer W3, and the second end and sliding end of potentiometer W3 is short
It connects and is electrically connected afterwards with the middle slip end of pressure regulation potentiometer W1, the emitter region of preamplifier T1 passes through resistance R6, capacitor C2
It is electrically connected with the anode of diode D5, and the cathode of capacitor C2 is electrically connected with the emitter of unijunction transistor T2, unijunction transistor
The second base stage of T2 is electrically connected by resistance R4 with the cathode of diode D2, the first base stage of unijunction transistor T2 and capacitor C2's
The primary parallel of anode and pulse transformer MB, the secondary of pulse transformer MB is by diode D10 and silicon controlled rectifier protecting circuit
It is in parallel；Silicon controlled rectifier protecting circuit includes silicon-controlled KP, capacitor C1 and resistance R1, the control electrode and diode of the silicon-controlled KP
The anode electrical connection of D10, the cathode of silicon-controlled KP are electrically connected with the cathode of diode D10, the anode and resistance R1 of silicon-controlled KP
One end electrical connection, the other end of resistance R1 is electrically connected after capacitor C1 with the cathode of diode D10；The one of varistor RV
End is electrically connected with the cathode of diode D10, anode of the other end of varistor RV Jing Guo sustained diode 1 and silicon-controlled KP
Electrical connection, and electromagnetic slip clutches coils from parallel connection of coils is at the both ends of sustained diode 1.
Beneficial effect compared with the existing technology is that using the above scheme, the present invention exports two kinds by step-down transformer
Voltage, input voltage of the alternating voltage of the first output end output as given circuit, the input voltage pass through the first rectified current
Switch to more straight DC voltage through filter circuit again after the rectification of road, most afterwards after voltage regulator circuit pressure stabilizing, makes pressure regulation potentiometer W1
The DC voltage of output is the setting speed of control system, and the voltage of intermediate frequency of tachometer generator output first passes through the second rectification circuit
It is used as feedback voltage signal to be added to the both ends potentiometer W2 after carrying out rectifying and wave-filtering with filter circuit, by signal acquisition potentiometer W2's
Centre tap is sampled or adjusts to feedback voltage signal, then with given circuit output DC voltage compared with its difference into
Enter preamplifier T1 and amplify processing, preamplifier T1 is equivalent to a variable resistance, then changes the big of superposed signal
It is small, the conducting degree of preamplifier T1 is also changed, so that the pulse generation phase shift that trigger circuit generates, the control of silicon-controlled KP
Angle processed also changes therewith, so that output voltage and output electric current be made to change, is realized by electromagnetic slip clutches to motor
The stepless time adjustment of wide scope；And multiple resistances used in the stepless time adjustment circuit are minimum, electric energy loss also very little is applicable in
In the stepless time adjustment occasion of ac motor.
Detailed description of the invention
Illustrate embodiment or technical solution in the prior art in order to clearer, it below will be to embodiment or the prior art
The required attached drawing used is briefly described in description, it is clear that, the accompanying drawings in the following description is only some realities invented
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the alternating current generator stepless time adjustment control circuit electrical schematic diagram of the invention based on potentiometer control.
Specific embodiment
To facilitate the understanding of the present invention, in the following with reference to the drawings and specific embodiments, the present invention will be described in more detail.
A better embodiment of the invention is given in the attached drawing.But the invention can be realized in many different forms, and unlimited
In this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to the disclosure
Understand more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term used in this specification " fixation ", " integrated molding ",
For illustrative purposes only, the similar unit of structure is to identical label in the figure for "left", "right" and similar statement
Mark.
Unless otherwise defined, technical and scientific term all used in this specification is led with technology of the invention is belonged to
The normally understood meaning of the technical staff in domain is identical.Used term is only in the description of the invention in this specification
The purpose of description specific embodiment is not intended to the limitation present invention.
As shown in Figure 1, one embodiment of the present of invention is:
It is a kind of based on potentiometer control alternating current generator stepless time adjustment control circuit, including main circuit, be connected in parallel on main circuit input
Step-down transformer B, given circuit, speed measure feedback circuit, trigger circuit and the motor at end, the input terminal of the main circuit are city
Electric 220V, given circuit include the first output end, the first rectification circuit, filter circuit, voltage regulator circuit and the tune of step-down transformer B
Piezoelectric position device W1；Speed measure feedback circuit includes tachometer generator F, the second rectification circuit, filter capacitor C5, signal acquisition potentiometer
W2 and correcting potential device W4;Trigger circuit includes the second output terminal of step-down transformer B, third rectification circuit, clipping circuit, puts
Big charging circuit, unijunction transistor T2, pulse transformer MB, silicon controlled rectifier protecting circuit；
Single-phase switch and fuse are set on the firewire of the main circuit, and the first output end of step-down transformer B exports alternating current
Input voltage of the 40V as given circuit is pressed, the input voltage of given circuit is in parallel with the first rectification circuit for that will input electricity
Repoussage stream, is changed into straight DC voltage using filter circuit, after filter circuit is first in parallel with voltage regulator circuit again with pressure regulation
The both ends of potentiometer W1 are in parallel, and the DC voltage of the middle slip end output of pressure regulation potentiometer W1 is given voltage and fills with amplification
Circuit electrical connection；
Tachometer generator F output three-phase mid-frequency voltage successively with the second rectification circuit, filter capacitor C5, signal acquisition potentiometer
W2 is in parallel, and the filtered feedback voltage signal of filter capacitor C5 is added to the both ends of signal acquisition potentiometer W2, signal acquisition current potential
The centre tap of device W2 is sampled feedback voltage signal and is electrically connected with the emitter of unijunction transistor T2；Correcting potential device
The both ends of the both ends parallel filtering capacitor C5 of W4, and the centre tap of correcting potential device W4 is by revolution counter n and signal acquisition electricity
The second end electrical connection of position device W2；
Input voltage of the second output terminal output AC voltage 55V of step-down transformer B as trigger circuit, trigger circuit it is defeated
It is successively in parallel with third rectification circuit, clipping circuit and amplification charging circuit to enter voltage, amplifies the output end and list of charging circuit
The emitter of junction transistors T2 is electrically connected, and unijunction transistor T2 is successively electrically connected with pulse transformer MB, silicon controlled rectifier protecting circuit,
Silicon controlled rectifier protecting circuit is connect by electromagnetic slip clutches coil with ac motor.
Further, diode D1 is freewheeling diode, since electromagnetic slip clutches coil Z is inductive load, therefore two
Pole pipe D1 plays the role of making operating current continuously；RV is varistor, for inhibiting the overvoltage surge of alternating current source；City
Single-phase switch K and fuse RD is arranged in the electric side 220VC, and wherein fuse RD plays the overcurrent protection of main circuit, resistance R1, electricity
Hold the both ends that silicon-controlled KP is connected in parallel on after C1 connects, for the overvoltage protection as silicon-controlled KP.
Preferably, first rectification circuit includes diode D6, diode D7, diode D8, diode D9, and described two
It is in parallel with the diode D8 of series connection, diode D9 again after pole pipe D6 and diode D7 series connection；Filter circuit includes by being electrolysed
The RC filter of capacitor C3, C4 and resistance R7 composition；Voltage regulator circuit includes voltage-stabiliser tube DW3 and DW4 and the two is connected in parallel.
Preferably, second rectification circuit includes by diode D11 and concatenated first series circuit of D12, by two poles
Pipe D13 and concatenated second series circuit of D14 and by diode D15 and the concatenated third series circuit of D16, and first, second,
Third series circuit is connected in parallel.
Preferably, third rectification circuit includes diode D2, diode D3, diode D4, diode D5, the diode
It is in parallel with the diode D4 of series connection, diode D5 again after D2 series diode D3；The clipping circuit includes voltage-stabiliser tube DW1
With DW2 and the two is connected in parallel；The amplification charging circuit includes resistance R3, resistance R5, resistance R6, capacitor C2, potentiometer W3
It is electrically connected by resistance R3 with the cathode of diode D2 with the collecting zone of preamplifier T1, the preamplifier T1, it is preposition
The base area of amplifier T1 is electrically connected by resistance R5 with the first end of potentiometer W3, and the second end and sliding end of potentiometer W3 is short
It connects and is electrically connected afterwards with the middle slip end of pressure regulation potentiometer W1, the emitter region of preamplifier T1 passes through resistance R6, capacitor C2
It is electrically connected with the anode of diode D5, and the cathode of capacitor C2 is electrically connected with the emitter of unijunction transistor T2, unijunction transistor
The second base stage of T2 is electrically connected by resistance R4 with the cathode of diode D2, the first base stage of unijunction transistor T2 and capacitor C2's
The primary parallel of anode and pulse transformer MB, the secondary of pulse transformer MB is by diode D10 and silicon controlled rectifier protecting circuit
It is in parallel；Silicon controlled rectifier protecting circuit includes silicon-controlled KP, capacitor C1 and resistance R1, the control electrode and diode of the silicon-controlled KP
The anode electrical connection of D10, the cathode of silicon-controlled KP are electrically connected with the cathode of diode D10, the anode and resistance R1 of silicon-controlled KP
One end electrical connection, the other end of resistance R1 is electrically connected after capacitor C1 with the cathode of diode D10；The one of varistor RV
End is electrically connected with the cathode of diode D10, anode of the other end of varistor RV Jing Guo sustained diode 1 and silicon-controlled KP
Electrical connection, and electromagnetic slip clutches coils from parallel connection of coils is at the both ends of sustained diode 1.
Further, trigger circuit uses unijunction transistor trigger circuit；The second output terminal of step-down transformer B first exports
Alternating voltage 55V rectified to third rectification circuit, current-limiting resistance R2 is passed through in rectification output, then has clipping circuit to whole
Flow wave absorption, synchro source of the output voltage as trigger circuit；Charge-variable electricity of the preamplifier T1 as trigger circuit
Resistance, the DC voltage after synchronizing wave absorption passes through resistance R3, T1 and resistance R6 is capacitor C2 charging, when the voltage at the both ends capacitor C2
When reaching the peak point voltage of unijunction transistor T2, unijunction transistor T2 conducting, armature winding of the capacitor C2 through pulse transformer MB
Electric discharge；When the voltage at the both ends capacitor C2 is less than the peak point voltage of unijunction transistor T2, the recovery high resistant shape of unijunction transistor T2
State, voltage again charge to capacitor C2, when the voltage at the both ends capacitor C2 is greater than the peak point voltage of unijunction transistor T2, single crystals
Body pipe T2 is connected again, so constantly recycles, and generates a series of pulses at the both ends of pulse transformer MB, silicon-controlled to trigger.
Beneficial effect compared with the existing technology is that using the above scheme, the present invention exports two kinds by step-down transformer
Voltage, input voltage of the alternating voltage of the first output end output as given circuit, the input voltage pass through the first rectified current
Switch to more straight DC voltage through filter circuit again after the rectification of road, most afterwards after voltage regulator circuit pressure stabilizing, makes pressure regulation potentiometer W1
The DC voltage of output is the setting speed of control system, and the voltage of intermediate frequency of tachometer generator output first passes through the second rectification circuit
It is used as feedback voltage signal to be added to the both ends potentiometer W2 after carrying out rectifying and wave-filtering with filter circuit, by signal acquisition potentiometer W2's
Centre tap is sampled or adjusts to feedback voltage signal, then with given circuit output DC voltage compared with its difference into
Enter preamplifier T1 and amplify processing, preamplifier T1 is equivalent to a variable resistance, then changes the big of superposed signal
It is small, the conducting degree of preamplifier T1 is also changed, so that the pulse generation phase shift that trigger circuit generates, the control of silicon-controlled KP
Angle processed also changes therewith, so that output voltage and output electric current be made to change, is realized by electromagnetic slip clutches to motor
The stepless time adjustment of wide scope；And multiple resistances used in the stepless time adjustment circuit are minimum, electric energy loss also very little is applicable in
In the stepless time adjustment occasion of ac motor.
It should be noted that above-mentioned each technical characteristic continues to be combined with each other, the various embodiments not being enumerated above are formed,
It is accordingly to be regarded as the range of description of the invention record；Also, for those of ordinary skills, it can add according to the above description
To improve or convert, and all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (4)
1. a kind of alternating current generator stepless time adjustment control circuit based on potentiometer control, it is characterised in that: including main circuit, parallel connection
In the step-down transformer B of main circuit input terminal, given circuit, speed measure feedback circuit, trigger circuit and motor, the main circuit
Input terminal be alternating current 220V, given circuit include the first output end of step-down transformer B, the first rectification circuit, filter circuit,
Voltage regulator circuit and pressure regulation potentiometer W1；Speed measure feedback circuit includes tachometer generator F, the second rectification circuit, filter capacitor C5, letter
Number acquisition potentiometer W2 and correcting potential device W4;Trigger circuit includes the second output terminal of step-down transformer B, third rectified current
Road, clipping circuit, amplification charging circuit, unijunction transistor T2, pulse transformer MB, silicon controlled rectifier protecting circuit；
Single-phase switch and fuse are set on the firewire of the main circuit, and the first output end of step-down transformer B exports alternating current
Input voltage of the 40V as given circuit is pressed, the input voltage of given circuit is in parallel with the first rectification circuit for that will input electricity
Repoussage stream, is changed into straight DC voltage using filter circuit, after filter circuit is first in parallel with voltage regulator circuit again with pressure regulation
The both ends of potentiometer W1 are in parallel, and the DC voltage of the middle slip end output of pressure regulation potentiometer W1 is given voltage and fills with amplification
Circuit electrical connection；
Tachometer generator F output three-phase mid-frequency voltage successively with the second rectification circuit, filter capacitor C5, signal acquisition potentiometer
W2 is in parallel, and the filtered feedback voltage signal of filter capacitor C5 is added to the both ends of signal acquisition potentiometer W2, signal acquisition current potential
The centre tap of device W2 is sampled feedback voltage signal and is electrically connected with the emitter of unijunction transistor T2；Correcting potential device
The both ends of the both ends parallel filtering capacitor C5 of W4, and the centre tap of correcting potential device W4 is by revolution counter n and signal acquisition electricity
The second end electrical connection of position device W2；
Input voltage of the second output terminal output AC voltage 55V of step-down transformer B as trigger circuit, trigger circuit it is defeated
It is successively in parallel with third rectification circuit, clipping circuit and amplification charging circuit to enter voltage, amplifies the output end and list of charging circuit
The emitter of junction transistors T2 is electrically connected, and unijunction transistor T2 is successively electrically connected with pulse transformer MB, silicon controlled rectifier protecting circuit,
Silicon controlled rectifier protecting circuit is connect by electromagnetic slip clutches coil with motor.
2. a kind of alternating current generator stepless time adjustment control circuit based on potentiometer control according to claim 1, special
Sign is: first rectification circuit include diode D6, diode D7, diode D8, diode D9, the diode D6 and
It is in parallel with the diode D8 of series connection, diode D9 again after diode D7 series connection；Filter circuit includes by electrolytic capacitor C3, C4
With the RC filter of resistance R7 composition；Voltage regulator circuit includes voltage-stabiliser tube DW3 and DW4 and the two is connected in parallel.
3. a kind of alternating current generator stepless time adjustment control circuit based on potentiometer control according to claim 1, special
Sign is: second rectification circuit include by diode D11 and concatenated first series circuit of D12, by diode D13 with
Concatenated second series circuit of D14 and by diode D15 and the concatenated third series circuit of D16, and the first, second, third string
Join circuit in parallel connection.
4. a kind of alternating current generator stepless time adjustment control circuit based on potentiometer control according to claim 1, special
Sign is: third rectification circuit includes diode D2, diode D3, diode D4, diode D5, the diode D2 series connection two
It is in parallel with the diode D4 of series connection, diode D5 again after pole pipe D3；The clipping circuit include voltage-stabiliser tube DW1 and DW2 and
The two is connected in parallel；The amplification charging circuit includes resistance R3, resistance R5, resistance R6, capacitor C2, potentiometer W3 and preceding storing
The collecting zone of big device T1, the preamplifier T1 are electrically connected by resistance R3 with the cathode of diode D2, preamplifier T1
Base area be electrically connected with the first end of potentiometer W3 by resistance R5, after second end and the sliding end short circuit of potentiometer W3 with tune
The middle slip end of piezoelectric position device W1 is electrically connected, and the emitter region of preamplifier T1 passes through resistance R6, capacitor C2 and diode
The anode electrical connection of D5, and the cathode of capacitor C2 is electrically connected with the emitter of unijunction transistor T2, the second of unijunction transistor T2
Base stage is electrically connected by resistance R4 with the cathode of diode D2, the first base stage of unijunction transistor T2 and the anode and arteries and veins of capacitor C2
The primary parallel of transformer MB is rushed, the secondary of pulse transformer MB is by diode D10 and silicon controlled rectifier protecting circuit in parallel；Controllably
Silicon protection circuit includes the control electrode of silicon-controlled KP, capacitor C1 and resistance R1, the silicon-controlled KP and the anode electricity of diode D10
Connection, the cathode of silicon-controlled KP are electrically connected with the cathode of diode D10, the anode and resistance R of silicon-controlled KP
1 one end electrical connection, the other end of resistance R1 are electrically connected after capacitor C1 with the cathode of diode D10；Varistor
One end of RV is electrically connected with the cathode of diode D10, and the other end of varistor RV is by sustained diode 1 and silicon-controlled KP
Anode electrical connection, and electromagnetic slip clutches coils from parallel connection of coils is at the both ends of sustained diode 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811589133.1A CN109802621A (en) | 2018-12-25 | 2018-12-25 | A kind of alternating current generator stepless time adjustment control circuit based on potentiometer control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811589133.1A CN109802621A (en) | 2018-12-25 | 2018-12-25 | A kind of alternating current generator stepless time adjustment control circuit based on potentiometer control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112398385A (en) * | 2020-11-06 | 2021-02-23 | 尹永云 | Speed regulating circuit of DC motor |
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2018
- 2018-12-25 CN CN201811589133.1A patent/CN109802621A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112398385A (en) * | 2020-11-06 | 2021-02-23 | 尹永云 | Speed regulating circuit of DC motor |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190524 |
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| WD01 | Invention patent application deemed withdrawn after publication |