CN201708756U - Driving device of series excited DC motor of variable paddle control system - Google Patents
Driving device of series excited DC motor of variable paddle control system Download PDFInfo
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- CN201708756U CN201708756U CN2010202173036U CN201020217303U CN201708756U CN 201708756 U CN201708756 U CN 201708756U CN 2010202173036 U CN2010202173036 U CN 2010202173036U CN 201020217303 U CN201020217303 U CN 201020217303U CN 201708756 U CN201708756 U CN 201708756U
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Abstract
The utility model provides a driving device of a series excited DC motor of a variable paddle control system, comprising a power circuit part and a control circuit part, wherein the power circuit part comprises a rectification unit, an energy consumption brake unit, a power switch circuit, an excitation reversing device, an AC input phase sequence detection unit, a bus voltage and output current detection unit and the like; the control circuit part comprises an analog signal sampling unit, a digital signal input acquisition circuit, a speed signal acquisition unit, a digital signal output unit, an upper computer information interaction unit, and the like. In the utility model, the circuit design is suitable for the frequency starting of the variable paddle control series excited DC motor at low speed by large moment, and the driving device has characteristics of fast response, current-limiting protection and flexible reversing, as well as the advantages of complete functions and high reliability.
Description
Technical field
The utility model belongs to the DC MOTOR CONTROL field, particularly is used for the series DC machine for pitch control system drive unit.
Background technology
Wind power generation is subjected to the extensive attention of various countries as the renewable and clean energy resource of present technology maturation.Variable blade control system is a building block important in the wind generator system, and to be control blade pitch angle automatically adjust with the size of wind speed its major function: when low wind speed, allow wind-driven generator have maximum starting torque; When wind speed is too high, change the angle of attack of air-flow, and then change wind-driven generator acquisition aerodynamic torque, make output of a generator keep stable blade.
Motor driver is one of critical component of variable blade control system.The motor driver major function of variable blade control system comprises that the output, fault message of collection, digital switch quantity signal and the control signal of analog and digital signal are handled and protection and with the information interaction of host computer etc.The design of motor driver is closely related with the motor type of selecting for use, and it has determined function, the hardware circuit of system, software controlling strategies etc.From present disclosed document, the patent and the data that relate to the motor driver that variable blade control system uses are very limited, and in the variable blade control system of wind-powered electricity generation field, use series DC machine at present the most always, therefore be necessary to design the drive unit of a kind of change oar control of function admirable with series DC machine.
The utility model content
Exploitation situation according to present series DC machine for pitch control system drive unit; for simplified design; improve the drive unit reliability; improve and become oar control series DC machine control performance; the utility model provides a kind of commutation simple, the change oar control series DC machine drive unit that defencive function is perfect.
The purpose of this utility model is achieved through the following technical solutions:
A kind of drive unit of series DC machine for pitch control system comprises the loop of power circuit part and controls this loop of power circuit control loop part partly, and described loop of power circuit partly comprises:
Rectification unit is used for input ac voltage is transformed into DC bus-bar voltage;
The dynamic braking unit is made of electronic switch and power resistor, and described electronic switch is by turn-offing and connect the described power resistor of energy, in order to protect drive unit by energy consumption to reduce busbar voltage;
Power switch circuit is made of four device for power switching of two-phase brachium pontis, by pulse width modulation and logic level signal control two-phase brachium pontis up and down two groups of device for power switching break-make so that be used for turn-offing and connecting series DC machine; One of them brachium pontis is controlled by logic level signal, be used to change the direction of receiving direct current machine voltage, thereby change the series DC machine direction of rotation, another brachium pontis is controlled by pulse width modulating signal, recently change the size of receiving the direct current machine armature voltage by the duty that changes the device for power switching break-make, thereby change the series DC machine rotating speed;
The excitation commutation device of control series DC machine excitation direction, this device is handled the electric current of the both forward and reverse directions of the loop generation of power switch circuit and series DC machine formation, make this sense of current constant, can change the motor direction of rotation thereby described drive unit only need change the armature voltage direction of series DC machine.
Further, described device for power switching is selected insulated gate bipolar transistor IGBT for use, or metal-oxide-semiconductor field effect t MOSFET.
Further, one group of device for power switching is connected to the anode of busbar voltage above the described two-phase brachium pontis, below one group of device for power switching be connected to the negative terminal of busbar voltage, two mid point one ends of brachium pontis are coupled to series DC machine armature winding, an end is coupled to the excitation commutation electronic installation.
Further, described loop of power circuit part also comprises the driver element that is used to control dynamic braking unit and power switch circuit, this driver element one end is coupled to control loop partly accepts the microprocessor logic signal, and the other end is coupled to described dynamic braking unit and power switch circuit to control its break-make.
Further, described drive unit comprises also and is used to detect the whether phase sequence detection. electronics of phase shortage of input voltage that this device produces a saltus step level and keeps this level to disappear up to the phase shortage phenomenon when detecting the input voltage phase shortage.
Further, described drive unit also comprises the voltage detection unit that is used to detect the DC bus-bar voltage that the rectification link produces, and busbar voltage can be converted to the signal that microprocessor can be discerned.
Further, described drive unit also comprises the current detecting unit that is used to detect the drive unit output current, converts output current to signal that microprocessor can be discerned by current sense device and capacitance resistance ware.
Further, described drive unit also comprises the speed detection unit that is used to detect the series DC machine real-time speed, can be the signal of telecommunication or the logical signal that microprocessor can be discerned with the conversion of signals by tachogenerator, pulse coder or other speed detection equipment collections.
Further, the control loop of described drive unit part is based on microprocessor, and comprises:
The motor velocity signal collecting unit in order to the rate signal of picking rate checkout gear, constitutes the closed loop feedback rate signal of described drive unit, and reports to the police under hypervelocity or zero-speed situation;
The collection of simulant signal unit is in order to gather the analog signal of current detecting unit, busbar voltage detecting unit and supply voltage monitoring unit and velocity setting unit;
The digital signal acquiring input unit is in order to gather the level signal that action command logic, fault reseting logic and phase sequence detection. electronics produce;
The digital signal output unit in order to according to the drive unit operation conditions, produces digital quantity signal;
The pulse width modulating signal generation unit produces the modulation signal of power controlling switching circuit in order to and the rate signal that speed detector detects, the current signal of current sampling circuit sampling given according to closed loop;
The processing unit of communicating by letter with host computer, in order to the information interaction of host computer.
The beneficial effects of the utility model are mainly reflected in: drive unit sampled digital and analog signal, judge whether state is normal, and drive unit is reported to the police and cut-out output when improper, and the various faults logic improves device reliability; Speed and current signal collection constitute the feedback signal of drive unit closed loop algorithm, because the strong overload capacity of series DC machine, big starting torque in the time of obtaining low speed by software algorithm control, limit maximum output current simultaneously, protection drive unit and direct current machine are not burnt when guaranteeing the instruction of drive unit rapid response speed; The excitation commutation device has guaranteed that the motor excitation sense of current is constant, change motor steering and only need change the armature winding voltage direction and get final product, and circuit is simple, and commutation is reliable, also makes things convenient for software to realize.The utility model is fit to variable blade control system low-speed and large-torque, Fraquent start, fast, higher to the reliability requirement applications of response speed.
Description of drawings
Below in conjunction with accompanying drawing technical solutions of the utility model are described further:
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is a loop of power circuit schematic diagram of the present utility model.
To be respectively the utility model turn to circuit theory diagrams under the logic in that two kinds in motor is different for Fig. 3 and Fig. 4.
Fig. 5 is the theory diagram that utilizes tachogenerator to test the speed.
Fig. 6 is the theory diagram that utilizes encoder to test the speed.
Embodiment
The utility model is big according to the torque of DC series electric motor starting, and overload capacity is strong, and is very suitable such as frequent start-stop occasion in the control of change oar, and need not to add field power supply, controls characteristics such as simple, and selecting this kind motor is drive unit actuator.
A kind of drive unit of series DC machine for pitch control system comprises the loop of power circuit part and controls this loop of power circuit control loop part partly, and described loop of power circuit partly comprises:
(1) rectification unit is used for input ac voltage is transformed into DC bus-bar voltage.
(2) dynamic braking unit is made of electronic switch and power resistor, and described electronic switch is by turn-offing and connect the described power resistor of energy, in order to protect drive unit by energy consumption to reduce busbar voltage; When busbar voltage is in below the normal voltage threshold values; electronic switch turn-offs; the dynamic braking unit is inoperative; under the busbar voltage abnormal conditions, raise and surpass the assigned voltage threshold values; electronic switch is opened; power resistor inserts bus, and the mode by energy consumption reduces the purpose that busbar voltage reaches the protection power electronic device.
(3) power switch circuit is made of four device for power switching of two-phase brachium pontis, by pulse width modulation and logic level signal control two-phase brachium pontis up and down two groups of device for power switching break-make so that be used for turn-offing and connecting series DC machine; One of them brachium pontis is controlled by logic level signal, be used to change the direction of receiving direct current machine voltage, thereby change the series DC machine direction of rotation, another brachium pontis is by pulse width modulation (PWM) signal controlling, recently change the size of receiving the direct current machine armature voltage by the duty that changes the device for power switching break-make, thereby change the series DC machine rotating speed; Described device for power switching is selected insulated gate bipolar transistor IGBT for use, or metal-oxide-semiconductor field effect t MOSFET or other switching devices.One group of device for power switching is connected to the anode of busbar voltage above the described two-phase brachium pontis, below one group of device for power switching be connected to the negative terminal of busbar voltage, two mid point one ends of brachium pontis are coupled to series DC machine armature winding, and an end is coupled to the excitation commutation electronic installation.The signal logic of two power switchs is opposite about the same brachium pontis; Two brachium pontis symmetries select brachium pontis to control voltage direction or voltage swing can be according to the actual conditions adjustment.
(4) the excitation commutation device of control series DC machine excitation direction, this device is handled the electric current of the both forward and reverse directions of the loop generation of power switch circuit and series DC machine formation, make this sense of current constant, can change the motor direction of rotation thereby described drive unit only need change the armature voltage direction of series DC machine.
(5) be used to control the driver element of dynamic braking unit and power switch circuit, this driver element one end is coupled to control loop partly accepts the microprocessor logic signal, and the other end is coupled to described dynamic braking unit and power switch circuit to control its break-make.
Further, described drive unit also comprises:
(6) be used to detect the whether phase sequence detection. electronics of phase shortage of input voltage, this device produces a saltus step level and keeps this level to disappear up to the phase shortage phenomenon when detecting the input voltage phase shortage.
(7) be used to detect the voltage detection unit of the DC bus-bar voltage that the rectification link produces, described busbar voltage detecting unit is transformed into the voltage signal that microprocessor can be discerned by divider resistance by a certain percentage with busbar voltage.
(8) be used to detect the current detecting unit of drive unit output current, convert output current to signal that microprocessor can be discerned by current sense device and capacitance resistance ware.
(9) being used to detect the speed detection unit of series DC machine real-time speed, can be the signal of telecommunication or the logical signal that microprocessor can be discerned with the conversion of signals by tachogenerator, pulse coder or other speed detection equipment collections.
Further, the control loop of described drive unit part is based on microprocessor, and comprises:
(1) motor velocity signal collecting unit in order to the rate signal of picking rate checkout gear, constitutes the closed loop feedback rate signal of described drive unit, and reports to the police under hypervelocity or zero-speed situation.
(2) current sampling unit, busbar voltage detecting unit and analog signals such as supply voltage monitoring and velocity setting unit are gathered in collection of simulant signal unit, this unit;
Wherein, described output current sampling unit is made of operational amplifier and peripheral components.The closed loop feedback signal of the current signal of output current detecting unit as software algorithm gathered in this unit, can obtain big starting torque when guaranteeing the starting of motor low speed on the one hand, makes its response given speed rapidly; It is excessive to limit output current on the other hand, protection drive unit and direct current machine.Current sampling signal constitutes the closed loop feedback current signal of described drive unit.
Described motor velocity signal collecting unit designs according to the motor velocity signal detection mode: if adopt tachogenerator to test the speed, then this unit is made of operational amplifier and peripheral components; If adopt encoder to test the speed, then this unit is by microprocessor capturing unit capture velocity signal.The rate signal of gathering guarantees motor tracing preset speed on the one hand as software algorithm closed loop feedback signal; Prevent the excessive and driving of motor speed on the other hand.It is given that the velocity setting signal constitutes described drive unit closed loop.
The supply voltage pilot signal constitutes the triggering source of supply voltage fault.
Described busbar voltage detecting unit is made of operational amplifier and peripheral components, gathers the voltage signal that the busbar voltage detecting unit is sent here.When busbar voltage surpasses dynamic braking unit action threshold values, control circuit sends brake unit and opens instruction; When busbar voltage surpasses the overvoltage threshold values, control circuit is reported to the police and is shut down.Bus voltage signal is through the logical process of microprocessor, and as the triggering source of dynamic braking unit, meanwhile, if the brake resistance of dynamic braking unit controls fails to reduce busbar voltage, control circuit will be reported to the police.
(3) digital signal acquiring input unit, this unit are gathered the level signal of action command logic, fault reseting logic and the generation of phase sequence detection. electronics etc.Wherein microprocessor produces operation or halt command after receiving the action command logic; After receiving the fault reseting logic, produce the fault reset command; After receiving the default phase signal existence, then do to report to the police and handle.Described digital signal input unit is made of light lotus root and peripheral components.The signal of gathering mainly contains phase shortage logic, action command logic, fault reseting logic etc.When the default phase signal existence, control circuit is reported to the police and is shut down; When action command exists, under the trouble-free situation of system, control circuit is carried out operating instruction; When the fault existence that resets, control circuit carries out the software reset to fault-signal.
(4) digital signal output unit, this unit produce digital quantity signals such as fan moves, system is normal according to system operation situation.Described digital signal output unit is made of light lotus root and peripheral components.Digital output signal mainly contains fan operation, system's normal state signal etc.The drive unit radiator temperature surpasses prescribed threshold, and control circuit sends the fan run signal; Drive unit fault-free, control circuit are sent system's normal state signal and are given the user with indication.
(5) pulse width modulating signal generation unit, the current signal of the rate signal that this unit is given according to closed loop and speed detector detects, current sampling circuit sampling etc. produces the modulation signal of power controlling switching circuit.
(6) processing unit of communicating by letter with host computer, the communication interface that this unit adopts is preferentially selected serial communication interface (RS485 or RS232 etc.) for use, is used for user's modification, stores, reads the parameter of drive unit, with the information interaction of host computer.
This control loop part course of work: control circuit detects digital input logic and analog input signal in real time, judging-driving unit has fault-free: if there is not fault then having under the situation of action command, according to given speed and feedback speed size and feedback current, handle through internal algorithm, the duty cycle signals of controlled power circuit and motor traffic direction logic are as the input of driver element; If fault is arranged, control circuit will be reported to the police and shut down.
The technical solution of the utility model specifically as shown in Figure 1, conversion obtains DC bus-bar voltage through ac/dc to exchange the three-phase input, the dynamic braking unit comes into force under the situation of busbar voltage above the action threshold values to reduce busbar voltage, the pulse width modulation of power circuit process obtains the voltage with the speed command coupling, excitation commutation keeps the excitation winding sense of current constant, and motor commutation only needs can finish by changing the armature winding voltage direction.Control circuit is gathered analog signals such as busbar voltage, output current, motor velocity signal can be that the analog signal input also can be the pulse input of encoder according to the difference of speed-measuring method, and wherein output current and motor velocity signal constitute the input variable of software closed-loop control algorithm; While also gathers phase sequence based on the control circuit of microprocessor and detects digital signals such as logic, action command, reset command, and the digital signal of output has fan operation control, driver operation preparation etc.; The information interaction of driver and host computer realizes by communication unit.
Fig. 2 provides the utility model master loop of power circuit schematic diagram.Wherein: T is the ac/dc rectification unit, C is bus capacitor (acting as energy storage and filtering), G2 is the switching device of control energy consumption resistance R break-make, G3～G6 is four switching devices of two-phase brachium pontis (are example with the insulated gate bipolar transistor IGBT), diode D1～D4 constitutes series DC machine exciting current reversing arrangement, L1 is the series DC machine excitation winding, and L2 is the armature winding.
The three-phase alternating current input obtains DC bus-bar voltage through diode rectification unit T and bus capacitor C.Switching device G2 and power resistor R constitute the dynamic braking unit, and G2 is subjected to the microprocessor logic signal controlling, and whether decision R inserts the dc bus loop.Switching device G3～G6 constitutes loop of power circuit two-phase brachium pontis, wherein G3, G4 are same brachium pontis two switching devices up and down, the emitter of G3 links to each other with the G4 collector electrode, the two drive signal complementation, G5, G6 are another brachium pontis two switching devices up and down, the emitter of G5 links to each other with the G6 collector electrode, the two drive signal complementation; G3, G5 collector electrode connect the busbar voltage anode, and G4, G6 emitter connect the busbar voltage negative terminal.Because two-phase brachium pontis symmetry, a brachium pontis are by the logic control of motor direction of rotation, another brachium pontis is then by the pulse width modulating signal control of regulating output voltage, and two groups of signal exchanges can be according to the practical application adjustment.Diode D1～D4 constitutes the exciting current reversing arrangement, and wherein the D1 anode links to each other with the D2 negative electrode, and connects the mid point that G3, G4 form brachium pontis; The D1 negative electrode links to each other with the D3 negative electrode, and is connected to excitation of direct current generator winding L 1 one ends; The anode of D2 links to each other with the D4 anode, and is connected to the excitation winding L1 other end; The D3 anode links to each other with the D4 negative electrode, and is connected to direct current machine armature winding L2 one end; The armature winding L2 other end is connected to the mid point that G5, G6 form brachium pontis.
Fig. 3 and Fig. 4 have provided the circuit theory diagrams of direct current machine when positive and negative two kinds of directions are rotated.Wherein: Udc represents busbar voltage.Defining the armature winding sense of current shown in Figure 3 is positive incentive, and this kind situation motor steering is a forward; Corresponding with Fig. 3, the armature winding sense of current shown in Figure 4 is a reverse energization, and motor steering is reverse.
The current excitation of armature winding L2 is a positive incentive among Fig. 3, and corresponding motor steering is a positive direction, and current path is switching tube G3, diode D1, excitation winding L1, diode D4, armature winding L2, switching tube G6.Corresponding with Fig. 3, current path was switching tube G5, armature winding L2, diode D3, excitation winding L1, diode D2, switching tube G4 when Fig. 4 provided the direct current machine counter-rotating.As can be seen, the sense of current of armature winding replaces break-make along with switching device and changes, but the excitation winding sense of current is constant all the time, and according to the series DC machine characteristic, turning to the armature winding sense of current of motor changes.Therefore, the on-off logic by software algorithm is arranged power switch G3～G6 can change turning to of motor, controls simple.
Fig. 5 and Fig. 6 are two embodiment theory diagrams of the utility model.Fig. 5 is the connection layout that utilizes tachogenerator to test the speed.The analog voltage signal of tachogenerator output is directly proportional with motor speed, the control veneer converts this voltage signal to analog signal that control chip (single-chip microcomputer or digital signal processor) can be discerned by a certain percentage by sample circuit, and control chip concerns that in proportion the numerical value that the processing mould/the number conversion passage obtains obtains motor speed.Fig. 6 is the theory diagram that utilizes encoder to test the speed.The pulse signal of encoder is caught in the pulse capture unit of control chip, calculates pulse number within a certain period of time, calculates motor speed according to the umber of pulse of encoder revolution.
The utility model still has multiple concrete execution mode.For example: described device for power switching can also adopt thyristor, promptly changes the size of receiving the direct current machine armature voltage by the conducting trigger angle that changes the thyristor break-make, thereby changes the series DC machine rotating speed.All employings are equal to replacement or equivalent transformation and all technical schemes of forming, all drop within the claimed scope of the utility model.
Claims (9)
1. the drive unit of a series DC machine for pitch control system comprises the loop of power circuit part and controls the control loop part of this loop of power circuit part, it is characterized in that: described loop of power circuit partly comprises,
Rectification unit is used for input ac voltage is transformed into DC bus-bar voltage;
The dynamic braking unit is made of electronic switch and power resistor, and described electronic switch is by turn-offing and connect the described power resistor of energy, in order to protect drive unit by energy consumption to reduce busbar voltage;
Power switch circuit is made of four device for power switching of two-phase brachium pontis, by pulse width modulation and logic level signal control two-phase brachium pontis up and down two groups of device for power switching break-make so that be used for turn-offing and connecting series DC machine; One of them brachium pontis is controlled by logic level signal, be used to change the direction of receiving direct current machine voltage, thereby change the series DC machine direction of rotation, another brachium pontis is controlled by pulse width modulating signal, recently change the size of receiving the direct current machine armature voltage by the duty that changes the device for power switching break-make, thereby change the series DC machine rotating speed;
The excitation commutation device of control series DC machine excitation direction, this device is handled the electric current of the both forward and reverse directions of the loop generation of power switch circuit and series DC machine formation, make this sense of current constant, can change the motor direction of rotation thereby described drive unit only need change the armature voltage direction of series DC machine.
2. the drive unit of series DC machine for pitch control system according to claim 1, it is characterized in that: described device for power switching is selected insulated gate bipolar transistor IGBT for use, or metal-oxide-semiconductor field effect t MOSFET.
3. the drive unit of series DC machine for pitch control system according to claim 2, it is characterized in that: one group of device for power switching is connected to the anode of busbar voltage above the described two-phase brachium pontis, below one group of device for power switching be connected to the negative terminal of busbar voltage, two mid point one ends of brachium pontis are coupled to series DC machine armature winding, and an end is coupled to the excitation commutation electronic installation.
4. the drive unit of series DC machine for pitch control system according to claim 1, it is characterized in that: described loop of power circuit part also comprises the driver element that is used to control dynamic braking unit and power switch circuit, this driver element one end is coupled to control loop partly accepts the microprocessor logic signal, and the other end is coupled to described dynamic braking unit and power switch circuit to control its break-make.
5. the drive unit of series DC machine for pitch control system according to claim 1, it is characterized in that: described drive unit also comprises and is used to detect the whether phase sequence detection. electronics of phase shortage of input voltage, this device produces a saltus step level and keeps this level to disappear up to the phase shortage phenomenon when detecting the input voltage phase shortage.
6. the drive unit of series DC machine for pitch control system according to claim 1, it is characterized in that: described drive unit also comprises the voltage detection unit that is used to detect the DC bus-bar voltage that the rectification link produces, and busbar voltage can be converted to the signal that microprocessor can be discerned.
7. the drive unit of series DC machine for pitch control system according to claim 1, it is characterized in that: described drive unit also comprises the current detecting unit that is used to detect the drive unit output current, converts output current to signal that microprocessor can be discerned by current sense device and capacitance resistance ware.
8. the drive unit of series DC machine for pitch control system according to claim 1, it is characterized in that: described drive unit also comprises the speed detection unit that is used to detect the series DC machine real-time speed, can be the signal of telecommunication or the logical signal that microprocessor can be discerned with the conversion of signals by tachogenerator, pulse coder or other speed detection equipment collections.
9. according to the drive unit of described any one series DC machine for pitch control system of claim 1 to 8, it is characterized in that: the control loop of described drive unit part is based on microprocessor, and comprises,
The motor velocity signal collecting unit in order to the rate signal of picking rate checkout gear, constitutes the closed loop feedback rate signal of described drive unit, and reports to the police under hypervelocity or zero-speed situation;
The collection of simulant signal unit is in order to gather the analog signal of current detecting unit, busbar voltage detecting unit and supply voltage monitoring unit and velocity setting unit;
The digital signal acquiring input unit is in order to gather the level signal that action command logic, fault reseting logic and phase sequence detection. electronics produce;
The digital signal output unit in order to according to the drive unit operation conditions, produces digital quantity signal;
The pulse width modulating signal generation unit produces the modulation signal of power controlling switching circuit in order to and the rate signal that speed detector detects, the current signal of current sampling circuit sampling given according to closed loop;
The processing unit of communicating by letter with host computer, in order to the information interaction of host computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202173036U CN201708756U (en) | 2010-06-07 | 2010-06-07 | Driving device of series excited DC motor of variable paddle control system |
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| CN2010202173036U CN201708756U (en) | 2010-06-07 | 2010-06-07 | Driving device of series excited DC motor of variable paddle control system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860311A (en) * | 2010-06-07 | 2010-10-13 | 苏州能健电气有限公司 | Drive device of series DC machine for pitch control system |
| CN102497138A (en) * | 2011-12-07 | 2012-06-13 | 北京科诺伟业科技有限公司 | Overspeed protection device of series excited DC (Direct Current) motor with variable-pitch system |
| CN104836402A (en) * | 2015-05-22 | 2015-08-12 | 张健强 | Automatic-excitation IGBT exciter |
| CN105991076A (en) * | 2015-02-12 | 2016-10-05 | 上海电气风电设备有限公司 | Ocean current generator excitation torque auxiliary braking system and operating mode |
| CN106300267A (en) * | 2016-08-29 | 2017-01-04 | 珠海格力电器股份有限公司 | Motor overload protection device and method, electric system |
-
2010
- 2010-06-07 CN CN2010202173036U patent/CN201708756U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860311A (en) * | 2010-06-07 | 2010-10-13 | 苏州能健电气有限公司 | Drive device of series DC machine for pitch control system |
| CN101860311B (en) * | 2010-06-07 | 2012-01-11 | 苏州能健电气有限公司 | Drive device of series DC machine for pitch control system |
| CN102497138A (en) * | 2011-12-07 | 2012-06-13 | 北京科诺伟业科技有限公司 | Overspeed protection device of series excited DC (Direct Current) motor with variable-pitch system |
| CN105991076A (en) * | 2015-02-12 | 2016-10-05 | 上海电气风电设备有限公司 | Ocean current generator excitation torque auxiliary braking system and operating mode |
| CN104836402A (en) * | 2015-05-22 | 2015-08-12 | 张健强 | Automatic-excitation IGBT exciter |
| CN106300267A (en) * | 2016-08-29 | 2017-01-04 | 珠海格力电器股份有限公司 | Motor overload protection device and method, electric system |
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