CN202068376U - Rotor frequency-variable speed regulation control device of motor - Google Patents
Rotor frequency-variable speed regulation control device of motor Download PDFInfo
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- CN202068376U CN202068376U CN 201120160405 CN201120160405U CN202068376U CN 202068376 U CN202068376 U CN 202068376U CN 201120160405 CN201120160405 CN 201120160405 CN 201120160405 U CN201120160405 U CN 201120160405U CN 202068376 U CN202068376 U CN 202068376U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model provides a rotor frequency-variable speed regulation control device of a motor, which comprises a rotor winding circuit, a starting circuit, a rectifying circuit, a soft switching chopper circuit, an active inverting circuit, an inverting circuit, a PLC (programmable logic controller) control protection detecting circuit, an on-site operation circuit, an HMI (human machine interface) visualization monitoring circuit and a DCS (data communication system) remote control circuit. The soft switching chopper circuit comprises a smoothing reactor L1, a chopper switch VS, a resonant circuit and an output capacitor Co, wherein the chopper switch VS is formed by one to n invert-conducting type insulated gate bipolar transistors VS1 to VSn which are in parallel connection. The resonant circuit consists of a resonant inductor Lr, a resonant capacitor Cr, a buffer capacitor Cb, a freewheel diode Do and three auxiliary diodes D1, D2 and D3. Reactive power compensation and soft switching chopper of the rotor frequency-variable speed regulation system are realized, switch consumption is low, power factor and electricity saving rate are high, performance is reliable, and high-capacity motor speed regulation control can not be limited by capacity of devices.
Description
Technical field
The utility model belongs to a kind of high-voltage alternating induction motor drive control device.Be particularly related to a kind of high-tension winding formula asynchronous motor rotor frequency changing regulating speed control apparatus.
Background technology
The motor of square torque load(ing) such as blower fan, water pump adopts the method for speed governing, can not only satisfy better and produce needs, and can save a large amount of energy.At present, using more in high pressure (as 6kV, 10kV) ac motor speed control field mainly is stator frequency control and rotor frequency conversion speed-adjusting two big classes.And in some field of high-tension motor, the rotor frequency conversion speed-adjusting of implementing control in rotor-side has very big advantage.The slip power that rotor frequency conversion speed-adjusting can produce speed governing easily takes out from the rotor winding, and the power frequency that the slip power that frequency constantly changes with rotating speed can be reverse into fixed-frequency sends electrical network back to or motor interior reuses, so it is a kind of efficient governing system.Because the control voltage of rotor frequency conversion speed-adjusting system is low, power controlling is little, and cost is low, and the reliability height is easy and simple to handle, thereby obtains extensive use in the every profession and trade field.But, all adopt hard switching copped wave in the rotor frequency conversion speed-adjusting system at present, di/dt rate of change in the circuit is big, the due to voltage spikes height, and all adopt the absorption circuit of RC or RCD energy-dissipating type, exist defectives such as the chopper circuit switching loss is big, the power consumption of absorption circuit is serious, particularly along with the raising of chopping frequency, these losses are just more obvious.
On the other hand, square torque load(ing) such as blower fan, water pump reduces shaft power with rotating speed and becomes cubic relationship to descend when speed governing, so the active power that the motor stator winding obtains from electrical network also reduces establishment side's relation with rotating speed and reduces, because rotor frequency conversion speed-adjusting system is to control in rotor-side, and the excitation of stator side is idle constant substantially in speed regulation process, the defective that the power factor of stator side descended to some extent when this just existed motor speed to reduce, and rotating speed more low power factor descend serious more.
Summary of the invention
The utility model is that the above-mentioned defective in the technology is now used in effective solution, and a kind of rotor-side variable frequency motor speed adjusting control device that can realize soft switch copped wave and reactive power compensation is provided.
Technical solution of the present utility model is: a kind of rotor-side variable frequency motor speed adjusting control device, and it comprises rotor winding circuit, start-up circuit, rectification circuit, soft switch chopper circuit, active-inverter, inverter, PLC control protection check circuit, local operation circuit, HMI visual control circuit, DCS circuit for remotely controlling; Start-up circuit, rectification circuit are connected on the motor rotor winding circuit; Inverter can be the adjusting winding circuit on the high pressure internal feedback motor stator, also can be the secondary winding circuit of contravariant transformer; Soft switch chopper circuit comprises smoothing reactor Ll, chopping switch VS, resonant circuit and output capacitance Co; The anodal a of the termination rectification circuit of smoothing reactor Ll, the input b of another termination resonant circuit; According to being determined that by the capacity needs of controlled motor chopping switch VS only composes in parallel against leading type igbt VS1 to VSn by 1 to n, promptly the collector and emitter of VS1 to VSn is connected to together; The emitter e utmost point of chopping switch VS connects the negative pole k of rectification circuit, the collector electrode c utmost point connects the positive pole of diode D1 in the resonant circuit, the output d of resonant circuit connects 1 end of output capacitance Co, 2 ends of output capacitance Co connect the negative pole k of rectification circuit, and 1 end of output capacitance Co also connects the input of active-inverter; Resonant circuit is made up of resonant inductance Lr, resonant capacitance Cr, buffer capacitor Cb, sustained diode o, three booster diode Dl, D2, D3.
Resonant circuit can be designed to following two kinds of forms in the described soft switch chopper circuit.Wherein a kind ofly be: the input b one tunnel of resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of booster diode D1, the other end one tunnel of resonant inductance Lr connects the positive pole of sustained diode o, one the tunnel connects the end of buffer capacitor Cb, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode Dl connects the positive pole of booster diode D2, one the tunnel connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, and the other end of resonant capacitance Cr connects the anodal a of described rectification circuit; The other end of resonant capacitance Cr also can connect the negative pole k of rectification circuit; The other end of resonant capacitance Cr can also connect the output d of resonant circuit.Another kind is: the input b one tunnel of resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of sustained diode o, Third Road connects the end of buffer capacitor Cb, the other end of resonant inductance Lr connects the positive pole of booster diode D1, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode D1 connects the positive pole of booster diode D2, another road connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, and the other end of resonant capacitance Cr connects the anodal a of described rectification circuit; The other end of resonant capacitance Cr also can connect the negative pole k of rectification circuit, and the other end of resonant capacitance Cr can also connect the output d of resonant circuit.
Soft switch chopper circuit of the present utility model has adopted against leading type igbt (IGBT) as chopping switch, adopts one group of small inductor, capacity cell and booster diode buffer circuit as its passive loss-free.This group small inductor, electric capacity produced resonance and carry out energy exchange in the chopping switch transition period, turn-off in order to the zero current passing and the no-voltage that realize chopping switch VS, fly-wheel diode also is operated under zero transition status, has promptly realized the lossless soft switch copped wave of rotor-side variable frequency.Soft switch chopper circuit of the present utility model has replaced IGBT hard switching chopper circuit and conventional RC or RCD absorbs circuit, thyristor chopper circuit and thyristor bridge-type breaking circuit have been cancelled, circuit is simplified, switching loss is reduced, the performance of device obtains to improve.Chopping switch adopts the contrary type IGBT device design in parallel of leading, and makes the large-size machine speed regulating control can not be subjected to the restriction of device self-capacity.
High Power Factor technical solution of the present utility model is: introduce reactive power compensation circuit between active-inverter and inverter; Reactive power compensation circuit can carry out reactive power compensation by one or more respectively according to the size of motor capacity and the degree of depth of speed governing, and can be according to practical operation situation segmentation switching; To high-tension motor than low capacity, can adopt one tunnel reactive power compensation, it is made up of the building-out capacitor C61-C63 of cut-in and cut-off contactor KM5, three-phase series reactor L3, corner connection; High-tension motor to big-and-middle capacity can adopt two-way or the reactive power compensation more than the two-way, the building-out capacitor C61-C63 of one route cut-in and cut-off contactor KM5, three-phase series reactor L3, corner connection forms, and the building-out capacitor C64-C66 of another route cut-in and cut-off contactor KM6, three-phase series reactor L4, corner connection forms.The reactance Rate of compensating circuit is 6%; Total compensation capacity of one or more reactive power compensation exceeds with the rated excitation reactive capability of motor stator winding.
The beneficial effects of the utility model are: realized the soft switch copped wave of rotor frequency conversion speed-adjusting system, and circuit reduction, switching loss is little, and the dependable performance of device has realized that the large-size machine speed regulating control is not subjected to the restriction of device self-capacity.Solved the High Power Factor technical problem by increasing reactive power compensation circuit.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model.
Fig. 2 is a kind of schematic diagram of circuit 3,4,5,6 in the utility model.
Fig. 3 is the another kind of schematic diagram of circuit 3,4,5,6 in the utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
As shown in Figure 1; the utility model is connected to form by rotor winding circuit 1, start-up circuit 2, rectification circuit 3, soft switch chopper circuit 4, active-inverter 5, reactive power compensation circuit 6, inverter 7 successively; aforementioned each several part connects PLC control protection check circuit 8 respectively, and local operation circuit 9, HMI visual control circuit 10, DCS circuit for remotely controlling 11 also connect PLC control protection check circuit 8 respectively.
As shown in Figure 2, start-up circuit 2, rectification circuit 3 are connected on the rotor winding circuit 1 of motor; Start-up circuit 2 can be made up of frequency sensitive trheostat and vacuum contactor, also can hinder starting cabinet by liquid and constitute; Rectification circuit 3 is by power diode VZ1, VZ2, VZ3, VZ, VZ5, VZ6 and the absorption three-phase bridge rectifier circuit that filter capacitor C31 forms of holding concurrently.Soft switch chopper circuit 4 comprises smoothing reactor L1, chopping switch VS, resonant circuit and output capacitance Co; The anodal a of the termination rectification circuit 3 of smoothing reactor L1, the input b of another termination resonant circuit, according to being determined that by the capacity needs of controlled motor chopping switch VS only composes in parallel against leading type IGBT device VS1 to VSn by 1 to n, promptly the collector and emitter of VS1 to VSn is connected to together; The emitter e utmost point of chopping switch VS connects the negative pole k of rectification circuit 3, the collector electrode c utmost point connects the positive pole of diode D1 in the resonant circuit, the output of resonant circuit connects 1 end of output capacitance Co, 2 of output capacitance Co terminates at the negative pole k of rectification circuit 3, and 1 end of output capacitance Co connects the input of active-inverter 5; Resonant circuit is by resonant inductance Lr, resonant capacitance Cr, buffer capacitor Cb, and sustained diode o, booster diode Dl, D2, D3 form; The input b one tunnel of resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of booster diode D1, the other end one tunnel of resonant inductance Lr connects the positive pole of sustained diode o, one the tunnel connects the end of buffer capacitor Cb, the negative pole of sustained diode o is connected to the output d of resonant circuit, the negative pole one tunnel of diode Dl connects the positive pole of booster diode D2, one the tunnel connects the end of resonant capacitance Cr, the negative pole one tunnel of D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 meets the output d of resonant circuit, the other end of resonant capacitance Cr is connected on the anodal a of rectification circuit 3, resonant capacitance Cr shown in solid line among Fig. 2; The other end of resonant capacitance Cr also can connect the negative pole k of rectification circuit 3, resonant capacitance Cr ＇ as shown in phantom in Figure 2; The other end of resonant capacitance Cr can also connect the output d of resonant circuit, resonant capacitance Cr ＂ as shown in phantom in Figure 2.Active-inverter 5 is by current limiting reactor L2, thyristor VN1, VN2, VN3, VN4, VN5 and VN6, capacitor C 51, C52, C53, C54, C55 and C56, resistance R 51, R52, R53, R54, R55 and R56, and vacuum contactor KM3 forms the conventional thyristor active inversion technology of active-inverter 5 employings.
As shown in Figure 3, its circuit constitutes and the circuit of Fig. 2 constitutes basic identical, it is the mode of connection difference of resonant inductance Lr in the resonant circuit in the wherein soft switch chopper circuit 4, it is connected the input b of resonant circuit and the positive pole of booster diode Dl, like this, the end of the positive pole of sustained diode o and buffering capacitor C b just directly is connected the input b of resonant circuit.The input b one tunnel of resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of sustained diode o, Third Road connects the end of buffer capacitor Cb, the other end of resonant inductance Lr connects the positive pole of booster diode D1, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode D1 connects the positive pole of booster diode D2, another road connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, the other end of resonant capacitance Cr connects the anodal a of described rectification circuit 3, resonant capacitance Cr shown in solid line among Fig. 3; The other end of resonant capacitance Cr also can connect the negative pole k of rectification circuit 3, resonant capacitance Cr ＇ as shown in phantom in Figure 3; The other end of resonant capacitance Cr can also connect the output d of resonant circuit, resonant capacitance Cr ＂ as shown in phantom in Figure 3.
Reactive power compensation circuit 6 is connected between active-inverter 5 and the inverter 7; Inverter 7 can be that the three-phase on the high pressure internal feedback motor stator is regulated winding, also can be the three-phase secondary winding that is connected on the contravariant transformer on the high-voltage fence; Reactive power compensation circuit 6 can be according to the size of motor capacity respectively by one the tunnel, two-way or the reactive power compensation circuit more than the two-way form, can practical operation situation segmentation switching; To high-tension motor than low capacity, can adopt one road reactive power compensation circuit, it is made up of the building-out capacitor C61-C63 of cut-in and cut-off contactor KM5, three-phase series reactor L3, corner connection; High-tension motor to big-and-middle capacity can adopt two-way or the reactive power compensation more than the two-way, the building-out capacitor C61-C63 of one route cut-in and cut-off contactor KM5, three-phase series reactor L3, corner connection forms, and the building-out capacitor C64-C66 of another route cut-in and cut-off contactor KM6, three-phase series reactor L4, corner connection forms; The reactance Rate of compensating circuit is 6%.One the road or total compensation capacity of the above reactive power compensation of two-way exceed with the rated excitation reactive capability of motor stator winding, guaranteeing at whole speed adjustable range internal power factor in 0.9 ~ 1.0, promptly be unlikely to when maximum speed or during full speed running power factor surpass 1.0 and overcompensation occurs.
Control detection protective circuit in the utility model, local operation circuit, DCS circuit for remotely controlling adopt the routine techniques and the conventional mode of connection, owing to be that conventional own technology no longer is described in detail at this.
Claims (9)
1. rotor-side variable frequency motor speed adjusting control device, it comprises rotor winding circuit (1), start-up circuit (2), rectification circuit (3), soft switch chopper circuit (4), active-inverter (5), inverter (7), PLC control protection check circuit (8), local operation circuit (9), HMI visual control circuit (10), DCS circuit for remotely controlling (11); It is characterized in that: soft switch chopper circuit (4) comprises smoothing reactor Ll, chopping switch VS, resonant circuit and output capacitance Co; The anodal a of the termination rectification circuit (3) of smoothing reactor Ll, the input b of another termination resonant circuit; According to being determined that by the capacity needs of controlled motor chopping switch VS only composes in parallel against leading type igbt VS1 to VSn by 1 to n, promptly the collector and emitter of VS1 to VSn is connected to together; The emitter e utmost point of chopping switch VS connects the negative pole k of rectification circuit (3), the collector electrode c utmost point connects the positive pole of diode D1 in the resonant circuit, the output d of resonant circuit connects 1 end of output capacitance Co, 2 ends of output capacitance Co connect the negative pole k of rectification circuit (3), and 1 end of output capacitance Co also connects the input of active-inverter (5); Resonant circuit is made up of resonant inductance Lr, resonant capacitance Cr, buffer capacitor Cb, sustained diode o, three booster diode Dl, D2, D3.
2. motor speed adjusting control device according to claim 1, it is characterized in that: the input b one tunnel of described resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of booster diode D1, the other end one tunnel of resonant inductance Lr connects the positive pole of sustained diode o, one the tunnel connects the end of buffer capacitor Cb, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode Dl connects the positive pole of booster diode D2, one the tunnel connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, and the other end of resonant capacitance Cr connects the anodal a of described rectification circuit (3).
3. motor speed adjusting control device according to claim 1, it is characterized in that: the input b one tunnel of described resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of booster diode Dl, the other end one tunnel of resonant inductance Lr connects the positive pole of sustained diode o, one the tunnel connects the end of buffer capacitor Cb, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode Dl connects the positive pole of booster diode D2, one the tunnel connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, and the other end of resonant capacitance Cr connects the negative pole k of described rectification circuit (3).
4. motor speed adjusting control device according to claim 1, it is characterized in that: the input b one tunnel of described resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of booster diode D1, the other end one tunnel of resonant inductance Lr connects the positive pole of sustained diode o, one the tunnel connects the end of buffer capacitor Cb, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode Dl connects the positive pole of booster diode D2, one the tunnel connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, and the other end of resonant capacitance Cr connects the output d of described resonant circuit.
5. motor speed adjusting control device according to claim 1, it is characterized in that: the input b one tunnel of described resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of sustained diode o, Third Road connects the end of buffer capacitor Cb, the other end of resonant inductance Lr connects the positive pole of booster diode D1, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode D1 connects the positive pole of booster diode D2, another road connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, and the other end of resonant capacitance Cr connects the anodal a of described rectification circuit (3).
6. motor speed adjusting control device according to claim 1, it is characterized in that: the input b one tunnel of described resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of sustained diode o, Third Road connects the end of buffer capacitor Cb, the other end of resonant inductance Lr connects the positive pole of booster diode D1, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode D1 connects the positive pole of booster diode D2, another road connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, and the other end of resonant capacitance Cr connects the negative pole k of described rectification circuit (3).
7. motor speed adjusting control device according to claim 1, it is characterized in that: the input b one tunnel of described resonant circuit connects the end of resonant inductance Lr, another road connects the positive pole of sustained diode o, Third Road connects the end of buffer capacitor Cb, the other end of resonant inductance Lr connects the positive pole of booster diode Dl, the negative pole of sustained diode o connects the output d of described resonant circuit, the negative pole one tunnel of booster diode D1 connects the positive pole of booster diode D2, another road connects the end of resonant capacitance Cr, the negative pole one tunnel of booster diode D2 connects the other end of buffer capacitor Cb, one the tunnel connects the positive pole of booster diode D3, the negative pole of booster diode D3 connects the output d of described resonant circuit, and the other end of resonant capacitance Cr connects the output d of described resonant circuit.
8. according to arbitrary described motor speed adjusting control device among the claim 1-7, it is characterized in that: between active-inverter (5) and inverter (7), introduce reactive power compensation circuit (6); Reactive power compensation circuit (6) carries out reactive power compensation by one or more respectively according to the size of motor capacity and the degree of depth of speed governing, and can be according to practical operation situation segmentation switching; To high-tension motor than low capacity, adopt one tunnel reactive power compensation, it is made up of the building-out capacitor C61-C63 of cut-in and cut-off contactor KM5, three-phase series reactor L3, corner connection; High-tension motor to big-and-middle capacity adopts two-way or the reactive power compensation more than the two-way, the building-out capacitor C61-C63 of one route cut-in and cut-off contactor KM5, three-phase series reactor L3, corner connection forms, and the building-out capacitor C64-C66 of another route cut-in and cut-off contactor KM6, three-phase series reactor L4, corner connection forms.
9. motor speed adjusting control device according to claim 8 is characterized in that: one of the absorption capacitor C 31 of described rectification circuit (3) terminates at the anodal a of rectification circuit (3), and the other end that absorbs capacitor C 31 is connected on the negative pole k of rectification circuit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120160405 CN202068376U (en) | 2011-05-19 | 2011-05-19 | Rotor frequency-variable speed regulation control device of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120160405 CN202068376U (en) | 2011-05-19 | 2011-05-19 | Rotor frequency-variable speed regulation control device of motor |
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| Publication Number | Publication Date |
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| CN202068376U true CN202068376U (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201120160405 Expired - Fee Related CN202068376U (en) | 2011-05-19 | 2011-05-19 | Rotor frequency-variable speed regulation control device of motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780431A (en) * | 2012-08-14 | 2012-11-14 | 天津伟力盛世节能科技有限公司 | Frequency conversion speed regulation remote centralized control circuit for high-voltage synchronous motor |
| CN112780600A (en) * | 2019-11-01 | 2021-05-11 | 大唐国际发电股份有限公司陡河发电厂 | Method for improving regulation of rotating speed of air pump based on chopping control |
-
2011
- 2011-05-19 CN CN 201120160405 patent/CN202068376U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780431A (en) * | 2012-08-14 | 2012-11-14 | 天津伟力盛世节能科技有限公司 | Frequency conversion speed regulation remote centralized control circuit for high-voltage synchronous motor |
| CN112780600A (en) * | 2019-11-01 | 2021-05-11 | 大唐国际发电股份有限公司陡河发电厂 | Method for improving regulation of rotating speed of air pump based on chopping control |
| CN112780600B (en) * | 2019-11-01 | 2022-03-04 | 大唐国际发电股份有限公司陡河发电厂 | Method for improving regulation of rotating speed of air pump based on chopping control |
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| Date | Code | Title | Description |
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| 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: 20111207 Termination date: 20130519 |