CN107404275B - Variable inductance type motor power-saving controller - Google Patents
Variable inductance type motor power-saving controller Download PDFInfo
- Publication number
- CN107404275B CN107404275B CN201710903964.0A CN201710903964A CN107404275B CN 107404275 B CN107404275 B CN 107404275B CN 201710903964 A CN201710903964 A CN 201710903964A CN 107404275 B CN107404275 B CN 107404275B
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- triode
- reactor
- motor
- secondary coil
- electrode
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- 230000005669 field effect Effects 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 8
- 230000001939 inductive effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/04—Single phase motors, e.g. capacitor motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/26—Power factor control [PFC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
Abstract
A power-saving controller of a variable inductance motor comprises a phase detection circuit and an inductance adjustment circuit, wherein the inductance adjustment circuit automatically adjusts a reactor according to a detected phase signal; the inductance adjusting circuit comprises a reactor BK, a primary coil of the reactor BK is connected in series in a current loop of the motor, a secondary coil of the reactor BK is connected with an input end of a bridge rectifier, a negative electrode of an output end of the bridge rectifier is grounded, an anode of the output end of the bridge rectifier is connected with a source electrode of a field effect tube T3, a drain electrode of the field effect tube T3 is grounded, and a grid electrode of the field effect tube T3 is connected with an anode of a filter capacitor C1. Compared with the prior art, the power saving controller is suitable for a single-phase motor, and the end voltage of the motor is adjusted by adjusting the inductance of the reactor so as to achieve the purpose of saving power, and the power saving effect reaches 20%; when the inductive reactance of the reactor is regulated, the waveform of the terminal voltage of the motor is not distorted, and no pollution is caused to a power grid; the circuit structure of the power saving controller is simple and the reliability is high.
Description
Technical Field
The invention relates to a motor electricity-saving device, which achieves the purpose of saving electricity by adjusting terminal voltage of a motor.
Background
When the motor runs below rated load, the power factor of the motor is reduced, the efficiency of the motor is lower, and the waste of electric energy is caused. In order to achieve the purpose of saving electricity, the terminal voltage of the motor is regulated by a thyristor according to the size of the load, and curve 3 in fig. 2 is a waveform of the terminal voltage of the motor after the thyristor is regulated, so as to improve the power factor by reducing the terminal voltage of the motor. The disadvantage of using a silicon controlled rectifier is that higher harmonics can be generated to pollute the power grid; in order to eliminate the influence of higher harmonic waves, a filter circuit is needed, and the manufacturing cost of the power saver is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a variable inductance motor power-saving controller, which adjusts the terminal voltage of a motor by changing the inductance of an inductor, and the voltage waveform of the motor is not distorted in the power-saving operation process, so that the power grid is not polluted. The motor is a single-phase alternating current motor.
The invention has the technical scheme that the power-saving controller of the variable inductance motor comprises a phase detection circuit and an inductance adjustment circuit for automatically adjusting a reactor according to a detected phase signal;
the phase detection circuit is characterized by comprising a current transformer LH and a step-down transformer B1, wherein a primary coil of the current transformer LH is connected in series in a current loop of a motor MD, one end of a secondary coil of the current transformer LH is connected with a base electrode of a triode T1, the other end of the secondary coil of the current transformer LH is connected with a base electrode of a triode T2, one end of a resistor R1 is connected with a center tap of the secondary coil of the current transformer LH, and the other end of the resistor R1 is connected with an emitter electrode of the triode T1 and an emitter electrode of the triode T2; the primary coil of the step-down transformer B1 is connected with a mains supply in parallel, one end of a secondary coil L1 of the step-down transformer B1 is connected with a collector of a triode T1, the other end of the secondary coil L1 of the step-down transformer B1 is connected with a collector of a triode T2, a center tap of the secondary coil L1 of the step-down transformer B1 is connected with an emitter of the triode T1 and an emitter of the triode T2 through a resistor R2, and a center tap of the secondary coil L1 of the step-down transformer B1 is grounded; the upper voltage of the resistor R2 is the phase signal voltage Uin, one end of the resistor R3 is connected with the emitter of the triode T1, the other end of the resistor R3 is connected with the positive electrode of the filter capacitor C1, and the negative electrode of the filter capacitor C1 is grounded;
the inductance adjusting circuit comprises a reactor BK, a primary coil of the reactor BK is connected in series in a current loop of the motor, a secondary coil of the reactor BK is connected with an input end of a bridge rectifier, a negative electrode of an output end of the bridge rectifier is grounded, an anode of the output end of the bridge rectifier is connected with a source electrode of a field effect tube T3, a drain electrode of the field effect tube T3 is grounded, and a grid electrode of the field effect tube T3 is connected with an anode of a filter capacitor C1.
Compared with the prior art, the power saving controller adjusts the terminal voltage of the motor by adjusting the inductive reactance of the reactor so as to achieve the power saving purpose, and the waveform of the terminal voltage of the motor is not distorted when the inductive reactance of the reactor is adjusted, so that the power saving controller has no pollution to a power grid; the circuit structure of the power saving controller is simple and the reliability is high.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Curve 1 of fig. 2 is a mains voltage waveform, curve 2 is a motor terminal voltage waveform regulated by a reactor, and curve 3 is a motor terminal voltage waveform regulated by a thyristor.
Description of the embodiments
Specific embodiments of the present invention will now be described with reference to the accompanying drawings.
A power-saving controller for a variable inductance motor comprises a phase detection circuit and an inductance adjustment circuit for automatically adjusting a reactor according to a detected phase signal.
The phase detection circuit comprises a current transformer LH and a step-down transformer B1, wherein a primary coil of the current transformer LH is connected in series in a current loop of the motor MD, one end of a secondary coil of the current transformer LH is connected with a base electrode of a triode T1, the other end of the secondary coil of the current transformer LH is connected with a base electrode of a triode T2, one end of a resistor R1 is connected with a center tap of the secondary coil of the current transformer LH, and the other end of the resistor R1 is connected with an emitter electrode of the triode T1 and an emitter electrode of the triode T2; the primary coil of the step-down transformer B1 is connected with the mains voltage in parallel, one end of the secondary coil L1 of the step-down transformer B1 is connected with the collector of the triode T1, the other end of the secondary coil L1 of the step-down transformer B1 is connected with the collector of the triode T2, the center tap of the secondary coil L1 of the step-down transformer B1 is connected with the emitter of the triode T1 and the emitter of the triode T2 through a resistor R2, and the center tap of the secondary coil L1 of the step-down transformer B1 is grounded; the upper voltage of the resistor R2 is the phase signal voltage Uin, one end of the resistor R3 is connected with the emitter of the triode T1, the other end of the resistor R3 is connected with the positive electrode of the filter capacitor C1, and the negative electrode of the filter capacitor C1 is grounded.
The principle of the phase detection circuit is that the voltage signal of the secondary coil of the current transformer LH is in phase with the current ia in the current loop of the motor MD, and the voltage signal of the secondary coil of the step-down transformer B1 is in phase with the mains voltage ua; when the voltage polarity of one end of the secondary coil of the current transformer LH and the voltage polarity of one end of the secondary coil L1 of the step-down transformer B1 are positive, the collector of the triode T1 generates current, and similarly when the voltage polarity of the other end of the secondary coil of the current transformer LH and the voltage polarity of the other end of the secondary coil L1 of the step-down transformer B1 are positive, the collector of the triode T2 generates current; the collector current of the triode T1 and the collector current of the triode T2 form a phase signal voltage Uin on a resistor R2; when the power factor decreases (i.e. the load is small) during operation of the motor, the phase difference between the supply voltage ua and the current ia increases and the phase signal voltage decreases and vice versa.
The resistor R3 and the filter capacitor C1 form a filter circuit for filtering the phase signal voltage Uin, and the voltage of the filter capacitor C1 is in direct proportion to the phase signal voltage Uin.
The inductance adjusting circuit comprises a reactor BK, a primary coil of the reactor BK is connected in series in a current loop of the motor, a secondary coil of the reactor BK is connected with an input end of a bridge rectifier QL1, a negative electrode of an output end of the bridge rectifier QL1 is grounded, a positive electrode of the output end of the bridge rectifier QL1 is connected with a source electrode of a field effect tube T3, a drain electrode of the field effect tube T3 is grounded, and a grid electrode of the field effect tube T3 is connected with a positive electrode of a filter capacitor C1. The field effect transistor is an enhanced insulated gate field effect transistor.
The principle of the inductance adjusting circuit is that when the phase signal voltage Uin is reduced, the grid voltage of the field effect transistor T3 changes along with the phase signal voltage Uin, when the phase signal voltage Uin is reduced, the source electrode current of the field effect transistor T3 is reduced, the equivalent inductance of the reactor BK is increased, and the terminal voltage of the motor is reduced; when the phase signal voltage Uin is increased, the source current of the field effect transistor T3 is increased, the equivalent inductance of the reactor BK is reduced, and the terminal voltage of the motor is increased; the electricity-saving effect can reach 20 percent.
In the process of regulating the motor terminal voltage by adopting the reactor, the waveform of the motor terminal voltage is a sine wave, as shown by curve 2 in fig. 2; the voltage waveform of the motor end regulated by the controllable silicon is discontinuous, as shown in a curve 3 in fig. 2, and the motor end regulated by the controllable silicon contains higher harmonic components, so that the pollution to a power grid is generated.
Claims (1)
1. A power-saving controller of a variable inductance motor comprises a phase detection circuit and an inductance adjustment circuit, wherein the inductance adjustment circuit automatically adjusts a reactor according to a detected phase signal;
the phase detection circuit is characterized by comprising a current transformer LH and a step-down transformer B1, wherein a primary coil of the current transformer LH is connected in series in a current loop of a motor MD, one end of a secondary coil of the current transformer LH is connected with a base electrode of a triode T1, the other end of the secondary coil of the current transformer LH is connected with a base electrode of a triode T2, one end of a resistor R1 is connected with a center tap of the secondary coil of the current transformer LH, and the other end of the resistor R1 is connected with an emitter electrode of the triode T1 and an emitter electrode of the triode T2; the primary coil of the step-down transformer B1 is connected with the mains voltage in parallel, one end of the secondary coil L1 of the step-down transformer B1 is connected with the collector of the triode T1, the other end of the secondary coil L1 of the step-down transformer B1 is connected with the collector of the triode T2, the center tap of the secondary coil L1 of the step-down transformer B1 is connected with the emitter of the triode T1 and the emitter of the triode T2 through a resistor R2, and the center tap of the secondary coil L1 of the step-down transformer B1 is grounded; the upper voltage of the resistor R2 is the phase signal voltage Uin, one end of the resistor R3 is connected with the emitter of the triode T1, the other end of the resistor R3 is connected with the positive electrode of the filter capacitor C1, and the negative electrode of the filter capacitor C1 is grounded;
the inductance adjusting circuit comprises a reactor BK, a primary coil of the reactor BK is connected in series in a current loop of the motor, a secondary coil of the reactor BK is connected with an input end of a bridge rectifier, a negative electrode of an output end of the bridge rectifier is grounded, an anode of the output end of the bridge rectifier is connected with a source electrode of a field effect tube T3, a drain electrode of the field effect tube T3 is grounded, and a grid electrode of the field effect tube T3 is connected with an anode of a filter capacitor C1; the field effect transistor is an enhanced insulated gate field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710903964.0A CN107404275B (en) | 2017-09-29 | 2017-09-29 | Variable inductance type motor power-saving controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710903964.0A CN107404275B (en) | 2017-09-29 | 2017-09-29 | Variable inductance type motor power-saving controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107404275A CN107404275A (en) | 2017-11-28 |
| CN107404275B true CN107404275B (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710903964.0A Active CN107404275B (en) | 2017-09-29 | 2017-09-29 | Variable inductance type motor power-saving controller |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1151347A (en) * | 1966-08-24 | 1969-05-07 | Kh Politekhn I Im | Apparatus for Converting Electrical Power into Pulse Current |
| CN86206609U (en) * | 1986-12-22 | 1987-10-03 | 上海自动化仪表六厂 | Two-way scr voltage regulator |
| US5003242A (en) * | 1985-03-01 | 1991-03-26 | Square D Company | Reduced voltage starter |
| CN2614401Y (en) * | 2003-04-23 | 2004-05-05 | 邝旭兵 | Energy saving controller for three-phase motor |
| CN2711985Y (en) * | 2004-06-17 | 2005-07-20 | 付廷福 | Single phase motor energy saving device for refrigerator, freezer and air conditioner |
| CN105388948A (en) * | 2015-11-30 | 2016-03-09 | 丁婕 | Inductance adjusting type single-phase alternating current voltage stabilizer |
| CN207166392U (en) * | 2017-09-29 | 2018-03-30 | 丁毅 | Become sense formula electricity-saving controller for electric motor |
-
2017
- 2017-09-29 CN CN201710903964.0A patent/CN107404275B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1151347A (en) * | 1966-08-24 | 1969-05-07 | Kh Politekhn I Im | Apparatus for Converting Electrical Power into Pulse Current |
| US5003242A (en) * | 1985-03-01 | 1991-03-26 | Square D Company | Reduced voltage starter |
| CN86206609U (en) * | 1986-12-22 | 1987-10-03 | 上海自动化仪表六厂 | Two-way scr voltage regulator |
| CN2614401Y (en) * | 2003-04-23 | 2004-05-05 | 邝旭兵 | Energy saving controller for three-phase motor |
| CN2711985Y (en) * | 2004-06-17 | 2005-07-20 | 付廷福 | Single phase motor energy saving device for refrigerator, freezer and air conditioner |
| CN105388948A (en) * | 2015-11-30 | 2016-03-09 | 丁婕 | Inductance adjusting type single-phase alternating current voltage stabilizer |
| CN207166392U (en) * | 2017-09-29 | 2018-03-30 | 丁毅 | Become sense formula electricity-saving controller for electric motor |
Non-Patent Citations (1)
| Title |
|---|
| 张儒斌.一种新型电焊机节电控制器的制作与调试.电子世界.1995,(第02期),全文. * |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20231007 Address after: A1-416, Building 1, No. 309, Ping'an Avenue, Liang'antian Community, Pinghu Street, Longgang District, Shenzhen, Guangdong 518000 Applicant after: Shenzhen Dongqiao Energy Saving Technology Group Co.,Ltd. Address before: Room 301, jiangluoyuan street, heilitang District, Jiangsu Province Applicant before: Ding Yi |
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