CN101908789A - Variable-frequency alternating current motor with digital output signals - Google Patents
Variable-frequency alternating current motor with digital output signals Download PDFInfo
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- CN101908789A CN101908789A CN2009100336261A CN200910033626A CN101908789A CN 101908789 A CN101908789 A CN 101908789A CN 2009100336261 A CN2009100336261 A CN 2009100336261A CN 200910033626 A CN200910033626 A CN 200910033626A CN 101908789 A CN101908789 A CN 101908789A
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Abstract
The invention provides a variable-frequency alternating current motor with digital output signals, which is provided with an electromagnetic brake for controlling the stop-start of blades and a combined encoder for collecting the rotational speed signal of the motor and detecting the position or angle signals of the blades, wherein the electromagnetic brake and the combined encoder are fixed on a casing of the variable-frequency alternating-current motor. A driving system of the variable-frequency alternating current motor consists of a diode AC/DC module and an IGBT (Insulated Gate Bipolar Transistor) module used as an instantaneous switch, and the diode AC/DC module and the IGBT module are connected with each other. The variable-frequency alternating current motor has the advantages that the rotational speed signals of the motor and the position signals of the blades can be simultaneously output by one combined encoder, the rotational signals are output by number, the algorithm of a master control system is simplified, the control precision of the blades is improved, the service life of the motor is effectively prolonged, and the variable-frequency alternating current motor is applied to drive the blades. The variable-frequency alternating current motor has simple production process and low cost.
Description
Technical field
The present invention relates to a kind of frequency-conversion alternating current motor and subsidiary configuration thereof of paddle changing wind power generator, belong to technical field of wind power generation.
Background technology
In wind power generation field, generally use the DC series excitation motor to drive blade at present.The DC series excitation motor has disposed electromagnetic brake, resolver and absolute type encoder, come the tach signal of real-time output motor by resolver, export position (angle) signal of blade in real time by absolute type encoder, the master control system that is independent of the outer whole variable blade control system of series excited machine is implemented control according to the motor real-time speed and the blade position signal that receive to this series excited machine closed loop.
But in the practical application, because the rate signal and the motor speed of resolver output are a kind of nonlinear functions, therefore control calculating is comparatively complicated, precision is relatively poor, the distortion factor is bigger.In order to improve the running stability of whole wind force generating system, pursue blade towards the desired angle of the wind comes from, master control system must be strengthened the control to motor speed.And from existing technological layer, the only resource that remedies rate accuracy is the pulse frequency that increases the motor input voltage, but the increase of pulse voltage frequency will certainly cause the shortening of electrical machinery life.
Summary of the invention
The objective of the invention is to solve above-mentioned technical problem, a kind of frequency-conversion alternating current motor of changing propeller pitch of wind power generator band digital output signal is provided, the resolver nonlinear distortion is big in the solution series excited machine configuration structure, and exports the problem that the master control system that causes is restive, electrical machinery life shortens by analog signal.
Purpose of the present invention is achieved through the following technical solutions:
A kind of frequency-conversion alternating current motor with digital output signal, the wheel hub that is loaded into wind-driven generator is interior by gearbox driving blade, and described frequency-conversion alternating current motor disposes the electromagnetic brake that is used to control blade stop; The combined encoding device of be used to gather motor speed signal, measuring blade position or angle signal; Described electromagnetic brake directly is connected on the motor shaft of described frequency-conversion alternating current motor, and the rotating shaft of described combined encoding device is connected with motor shaft by shaft coupling, and described electromagnetic brake and combined encoding device are fixed on the casing of described frequency-conversion alternating current motor.
Described combined encoding device includes the incremental encoder of gathering rotating speed and the absolute type encoder of measuring blade position or angle signal.
Comprise interconnective diode AC/DC module and the IGBT module that plays the instant shut-in effect in the drive system of described frequency-conversion alternating current motor, and a fault-signal detecting unit.Described IGBT module is connected with master control borad by Drive Protecting Circuit.Be connected with the current sensor that is used for measuring drive system current loading size on the described master control borad.
Beneficial effect of the present invention is mainly reflected in: (1) is by a combined encoding device while output motor rotating speed and blade position (angle) signal, and tach signal is exported with digital form, simplified the algorithm of master control system, improve the control precision of blade, and effectively prolonged the life-span of motor; (2) adopt variable-frequency alternating current motor, manufacturing process is simple, and cost is lower, and the complete blade that can be suitable for 4000 watts drives required.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1 is the structure cross-sectional schematic of frequency-conversion alternating current motor of the present invention.
Fig. 2 is the circuit signal schematic diagram of each electric component of frequency-conversion alternating current motor of the present invention.
Fig. 3 is the control block diagram of frequency-conversion alternating current motor of the present invention.
Embodiment
The present invention has disclosed a kind of frequency-conversion alternating current motor for pitch control of wind power generator and subsidiary configuration thereof.The circuit signal schematic diagram of the section of structure of frequency-conversion alternating current motor of the present invention as shown in Figure 1 and Figure 2 and each electric component: this frequency-conversion alternating current motor comprise carry out blade adjust the motor stator 11 of leading role, rotor 12, with rotor 12 integrated affixed rotating shafts 13 and be used for docking the electronically controlled terminal box 16 of realization with master control system, those main devices are contained in the motor housing 14 of hard, and motor housing one end is communicated with to connect establishes a blower fan 15, the needs of cooling when operating to satisfy frequency-conversion alternating current motor.In addition, its subsidiary configuration structure also includes the electromagnetic brake 4 that is used to control blade stop, the combined encoding device 2 that is used to gather motor speed signal, measures blade position or angle signal.This electromagnetic brake 4 directly is connected on the machine shaft 13, and encoder 2 rotating shafts are connected with machine shaft 13 by shaft coupling 5, and the body of electromagnetic brake 4 and encoder 2 are fixedly connected on the motor housing 14 of described frequency-conversion alternating current motor.
Analyze from circuit signal: frequency-conversion alternating current motor comprises that every service data signal of motor speed, blade distance or angle is obtained by the collection of combined encoding device, and is one-way transmitted to the frequency-variable controller unit by terminal box and carries out data operation; According to after the programming calculation process that is stored in the frequency-variable controller frequency-conversion alternating current motor being exported control signal, also can under the situation of needs, directly drive electromagnetic brake simultaneously, from motor internal frequency-conversion alternating current motor is carried out mechanical stop control.
Wherein this combined encoding device 2 comprises the incremental encoder of gathering rotating speed and the absolute type encoder of measuring blade position or angle signal, by an encoder while output motor rotating speed and blade position (angle) signal, and tach signal is exported with digital form, can effectively simplify the algorithm of master control system, improve the precision of blade control, and effectively prolonged the life-span of motor.
Fig. 3 has disclosed the schematic block diagram of the drive system of frequency-conversion alternating current motor of the present invention.
Comprise interconnective diode AC/DC module and the IGBT module that plays the instant shut-in effect in the drive system of described frequency-conversion alternating current motor, and a fault-signal detecting unit.
Described IGBT module is the insulated gate bipolar power tube, be the high-power switch device that plays the instant shut-in effect, by the compound full-control type voltage driven type power semiconductor device that BJT (double pole triode) and MOS (insulating gate type field effect tube) form, have the advantage of low conduction voltage drop two aspects of the high input impedance of MOSFET and GTR concurrently.Because the GTR saturation pressure reduces, current carrying density is big, but drive current is bigger; The MOSFET driving power is very little, and switching speed is fast, but conduction voltage drop is big, and current carrying density is little.And the IGBT module synthesis advantage of above two kinds of devices, the little and saturation pressure of driving power reduces.
Described IGBT module is connected with master control borad by Drive Protecting Circuit.Also be connected with two current sensors that are used for measuring drive system current loading size on the described master control borad.Described master control borad is controlled rotating speed of motor by the size of control voltage and frequency.
The present invention still has multiple concrete execution mode.All employings are equal to replacement or equivalent transformation and all technical schemes of forming, all drop within the scope of protection of present invention.
Claims (6)
1. frequency-conversion alternating current motor with digital output signal is loaded in the wheel hub of wind-driven generator and drives blade by gearbox, and it is characterized in that: described frequency-conversion alternating current motor disposes the electromagnetic brake that is used to control blade stop; The combined encoding device of be used to gather motor speed signal, measuring blade position or angle signal; Described electromagnetic brake directly is connected on the motor shaft of described frequency-conversion alternating current motor, and the rotating shaft of described combined encoding device is connected with motor shaft by shaft coupling, and described electromagnetic brake and combined encoding device are fixed on the casing of described frequency-conversion alternating current motor.
2. the frequency-conversion alternating current motor of band digital output signal according to claim 1 is characterized in that: described combined encoding device includes the incremental encoder of gathering rotating speed and the absolute type encoder of measuring blade position or angle signal.
3. the frequency-conversion alternating current motor of band digital output signal according to claim 1 is characterized in that: comprise interconnective diode AC/DC module and the IGBT module that plays the instant shut-in effect in the drive system of described frequency-conversion alternating current motor.
4. the frequency-conversion alternating current motor of band digital output signal according to claim 3 is characterized in that: described IGBT module is connected with master control borad by Drive Protecting Circuit.
5. the frequency-conversion alternating current motor of band digital output signal according to claim 4 is characterized in that: be connected with the current sensor that is used for measuring drive system current loading size on the described master control borad.
6. the frequency-conversion alternating current motor of band digital output signal according to claim 3 is characterized in that: the drive system of described frequency-conversion alternating current motor also comprises a fault-signal detecting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100336261A CN101908789A (en) | 2009-06-05 | 2009-06-05 | Variable-frequency alternating current motor with digital output signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100336261A CN101908789A (en) | 2009-06-05 | 2009-06-05 | Variable-frequency alternating current motor with digital output signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101908789A true CN101908789A (en) | 2010-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100336261A Pending CN101908789A (en) | 2009-06-05 | 2009-06-05 | Variable-frequency alternating current motor with digital output signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101908789A (en) |
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2009
- 2009-06-05 CN CN2009100336261A patent/CN101908789A/en active Pending
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Application publication date: 20101208 |