CN200980061Y - A torque generator with a high power factor and a low pulsation - Google Patents
A torque generator with a high power factor and a low pulsation Download PDFInfo
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- CN200980061Y CN200980061Y CNU2006200797467U CN200620079746U CN200980061Y CN 200980061 Y CN200980061 Y CN 200980061Y CN U2006200797467 U CNU2006200797467 U CN U2006200797467U CN 200620079746 U CN200620079746 U CN 200620079746U CN 200980061 Y CN200980061 Y CN 200980061Y
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Abstract
The utility model discloses a high power density low-ripple torque generator, wherein an alternating current output of a motor passes through a bridge rectification circuit and then gets a pulsating direct current output, and the output of the bridge rectification circuit is connected with an input filter element which output end is connected with a power switch element via a boost pressure inductance, and the power switch element is connected with the input filter element via a high-frequency rectification element and then gets a low-ripple direct current output voltage for supplying a load. The sample output signal of the input voltage, output voltage and load current entrance to a test-and-control protection main circuit which input is connected with the power switch element and controls the output frequency and duty-cycle of the power switch element, and also adjusts the output power, load current, output current of the motor, and finally adjusts and controls the output torque of the motor. The utility model can be used to improve the power density and output voltage usage of the motor and reduce current harmonic, and can extend working range and inhibit pulse torque.
Description
Technical field
The utility model belongs to the motor technology field, is specifically related to the low pulsation of a kind of High Power Factor torque generator.
Background technology
Torque generator be a kind of can long-play at the motor of low speed state, be widely used in industries such as weaving, printing and dyeing, papermaking, electric wire, cable, rubber and metallurgy.
The output torque of torque generator is directly proportional with the output current of torque motor, and common controller makes its output current have bigger harmonic wave, produces bigger pulsating torque, and working range is narrow, and circuit conversion efficient is low, and Electro Magnetic Compatibility is poor.
The electromagnetic torque physical expressions of motor is
M＝C
TΦ
mI
2cosθ (1)
C in the formula
T---the moment coefficient of motor
Φ
m---the main flux of motor
I
2---the rotor current of motor
Cos θ---power factor
General C
TAnd Φ
mBe constant, so electromagnetic torque is main relevant with rotor current and power factor thereof, the output current of adjusting motor just can be realized the control to output torque, has adopted interchange full-bridge rectification, direct current to cut the circuit of control in the circuit in the past.The output current of certain the type motor that records when 750rpm/50Hz and frequency spectrum thereof are as shown in Figure 1.
In Fig. 1, from the motor output current wave, obviously have each harmonic, and the each harmonic amplitude is bigger; When containing l (odd number) primary current harmonic wave in the motor, in the air gap of motor, produce harmonic magnetic potential, and set up the harmonic wave rotating magnetic field; L subharmonic magnetic field rotates along the fundamental wave magnetic field rightabout, and induces l+1 doubly to the rotor current of fundamental frequency, produces l+1 doubly to the harmonic torque of fundamental frequency, and the electromagnetic torque generation of motor is pulsed.
This moment, the instantaneous value of electromagnetic torque was
M in the formula
m---the amplitude of electromagnetic torque fluctuation component
ω
1---the first-harmonic angular frequency
m---the phase shift between wave component and fundametal compoment
Because the existence of fluctuation torque, even under the constant load torque, also there is dynamic torque in motor, thereby produces the fluctuation of speed, and formula (2) integration is got:
Ω in the formula
0---the stationary component of angular speed
Formula (3) shows, the wave component amplitude and the fundamental frequency omega of motor angle speed
1Be inversely proportional to ω
1Low more, the amplitude of wave component is big more; The wave component amplitude and the harmonic number of motor angle speed are inversely proportional to, and low-order harmonic is bigger than high order harmonic component to the influence of rotating speed.
Because the existence of fluctuation torque, even under the constant load torque, also there is dynamic torque in motor, thereby produces the fluctuation of speed.The wave component amplitude and the fundamental frequency of motor angle speed are inversely proportional to, and fundamental frequency is low more, and the amplitude of wave component is big more; The wave component amplitude and the harmonic number of motor angle speed are inversely proportional to, and low-order harmonic is bigger than high order harmonic component to the influence of rotating speed.
In sum, because the existence of pulsating torque, even when load is constant, when also being, the angular speed of motor becomes, when being in low cruise, motor also can produce creeping phenomenon, a large amount of harmonic waves is present in the complete airtight space simultaneously, and control circuit is produced very strong electromagnetic interference, to the high requirement of Electro Magnetic Compatibility proposition of other control circuits.Usually only considered the control to rotor current in the design, ignored the influence of power factor to the output torque, circuit conversion efficient is very low, and reactive loss increases, and the nominal torque requirement design volume of motor down increases, and moment of inertia increases.
The utility model content
The purpose of this utility model is at above-mentioned the deficiencies in the prior art, and the low pulsation of a kind of High Power Factor torque generator is provided, and to improve power of electric motor factor and output voltage utilance, reduces current harmonics, widens working range, the suppressor pulse torque.
For achieving the above object, the technical scheme that the utility model adopted is: the low pulsation of a kind of High Power Factor torque generator, it is characterized in that: the interchange output of motor is through bridge rectifier, obtain pulsating direct current output, bridge rectifier output termination input filtering link, input filtering link output connects power switch component through boost inductance, and power switch component connects output filtering link through the high-frequency rectification link, obtain the VD of low pulsation, supply load; Input voltage sampling, output voltage sampling and load current sampling output signal to Detection ﹠ Controling protection main circuit; Detection ﹠ Controling protection main circuit output termination power switch component; the output frequency of power controlling switch element and duty ratio; adjust the power output and the load current of circuit; regulate the output current of motor, finally carry out the adjustment and the control of the output torque of motor.
The utility model compared with prior art has the following advantages: 1, can suppress the wave distortion of motor output current, reduce current distortion, suppress pulsating torque and electromagnetic interference; 2, input power factor can be brought up to more than 0.98, be improved output torque and electric energy-mechanical energy conversion efficiency; 3, wide speed range work, the creeping phenomenon when avoiding low speed rotation, High Power Factor output when guaranteeing low speed; 4, wide voltage power supply scope, firm power output, the controlling torque output when guaranteeing low speed.
Description of drawings
Fig. 1 is the output current and the spectrogram thereof of certain type motor of recording when 750rpm/50Hz.
Fig. 2 is a connection block diagram of the present utility model.
The motor output load current waveform and the spectrogram of test when Fig. 3 compares test for adopting the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.
The low pulsation of a kind of High Power Factor as shown in Figure 2 torque generator, the interchange output of motor is through bridge rectifier, obtain pulsating direct current output, through the initial filtering of input filtering link, send into booster circuit, again through boost inductance, power switch component, copped wave is high frequency waves, through high-frequency rectification link and output filtering link, obtain the VD of low pulsation, supply load then.The signal of input voltage sampling, output voltage sampling and load current sampling is all sent into Detection ﹠ Controling protection main circuit; through calculating and the strategy adjustment; the output frequency of power controlling switch element and duty ratio; adjust the power output and the load current of circuit; regulate the output current of motor, finally carry out the adjustment and the control of the output torque of motor.
The utility model adopts the control of electric current and voltage dicyclo, and outer shroud is the output voltage FEEDBACK CONTROL, and interior ring is the input current FEEDBACK CONTROL.During the power switch component conducting, high-frequency rectification ends, and output filter capacitor is to load discharge, simultaneously the boost inductance energy storage; When power switch component ended, the energy storage of boost inductance was charged to output filter capacitor and load through high-frequency rectification.Because power switch component and high-frequency rectification alternate conduction, the rectifier output current is continuous through boost inductance, and it is also continuous to exchange input current.Input voltage sampling link sampling input voltage guarantees to change by sinusoidal rule by the current following input voltage of boost inductance, is proportional to input voltage by the high-frequency current envelope that boosts, and its average current is sinusoidal waveform; Input current also is sinusoidal waveform, therefore can effectively reduce the input current distortion factor, reduces Harmonics of Input.Output voltage sampling link sampling output voltage, the amplitude size of control output voltage.The watt level of load circuit sampling controlling output circuit, the max. output torque of decision motor.
Adopt the AC/DC type torque generator to compare test, the motor output load current waveform of test and frequency spectrum are as shown in Figure 3, as can be seen, the load current of motor is sinusoidal waveform, follow the output voltage waveforms of motor, fundamental voltage amplitude increases, and the low-order harmonic amplitude obviously reduces, and the number of times of high order harmonic component also obviously reduces.
Adopt direct rectification and ac/dc conversion to compare test, data are as shown in table 1, after the result shows the novel control technology of employing, the power factor of circuit is greatly improved, load current is minimized, circuit conversion efficient also is improved, and the motor designs size under nominal torque requires can greatly reduce; Lower humorous wave amplitude and less harmonic number have effectively suppressed the generation of pulsating torque; The inhibition ability of electromagnetic interference improves greatly simultaneously, and Electro Magnetic Compatibility has surpassed the CCEC/T07.2-2001 standard.
Table 1 motor output current test result (unit: mA)
| Harmonic number | Direct Rectifying Circuit | The AC/DC circuit | Harmonic number | Direct Rectifying Circuit | The AC/ |
| 1 | 316 | 320 | 13 | 68 | 8 |
| 3 | 284 | 0 | 15 | 48 | 10 |
| 5 | 136 | 8 | 17 | 28 | 2 |
| 7 | 148 | 0 | 19 | 20 | 4 |
| 9 | 84 | 2 | 21 | 20 | 6 |
| 11 | 68 | 2 | 23 | 16 | 2 |
| Power factor | 0.619 | 0.985 | The total current effective value | 491.3 (mA) | 320.4 (mA) |
| Power output (W) | 70.7 | 70.9 | Total harmonic distortion | 119％ | 5.37％ |
Claims (1)
1, the low pulsation of a kind of High Power Factor torque generator, it is characterized in that: the interchange output of motor is through bridge rectifier, obtain pulsating direct current output, bridge rectifier output termination input filtering link, input filtering link output connects power switch component through boost inductance, power switch component connects output filtering link through the high-frequency rectification link, obtains the VD of low pulsation, supply load; Input voltage sampling, output voltage sampling and load current sampling output signal to Detection ﹠ Controling protection main circuit; Detection ﹠ Controling protection main circuit output termination power switch component; the output frequency of power controlling switch element and duty ratio; adjust the power output and the load current of circuit; regulate the output current of motor, finally carry out the adjustment and the control of the output torque of motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200797467U CN200980061Y (en) | 2006-09-08 | 2006-09-08 | A torque generator with a high power factor and a low pulsation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200797467U CN200980061Y (en) | 2006-09-08 | 2006-09-08 | A torque generator with a high power factor and a low pulsation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200980061Y true CN200980061Y (en) | 2007-11-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200797467U Expired - Fee Related CN200980061Y (en) | 2006-09-08 | 2006-09-08 | A torque generator with a high power factor and a low pulsation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200980061Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104507241A (en) * | 2015-01-16 | 2015-04-08 | 矽力杰半导体技术(杭州)有限公司 | LED driver and LED lighting device |
-
2006
- 2006-09-08 CN CNU2006200797467U patent/CN200980061Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104507241A (en) * | 2015-01-16 | 2015-04-08 | 矽力杰半导体技术(杭州)有限公司 | LED driver and LED lighting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071121 Termination date: 20100908 |