CN102136823B - Alternating-current load control system - Google Patents
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- CN102136823B CN102136823B CN 201110116169 CN201110116169A CN102136823B CN 102136823 B CN102136823 B CN 102136823B CN 201110116169 CN201110116169 CN 201110116169 CN 201110116169 A CN201110116169 A CN 201110116169A CN 102136823 B CN102136823 B CN 102136823B
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Abstract
The invention discloses an alternating-current load control system which comprises 2N diodes, a switch device and a control module used for controlling on and off of the switch device, wherein N is the phase number of the alternating-current load; one end of each phase of winding or resistor of the alternating-current load is connected with two diodes respectively; the anode of one of the two diodes is connected with the winding or resistor of the phase, and the cathode of the diode is connected with one end of a switch passage of the switch device; the other end of the switch passage is connected with the anode of the other diode; the cathode of the other diode is connected with the winding or resistor of the phase; the other end of the N-phase winding or resistor of the alternating-current load is connected with an N-phase alternating-current voltage; and the control end of the switch device is connected with the control module. The alternating-current load control system has simplecircuit structure, low cost and good reliability, and can be used for speed regulation and soft starting control of an alternating-current motor and power control of other alternating-current loads.
Description
Technical field
The invention belongs to the Electrical Control Technology field, specifically, relate to a kind of AC load control system that can realize speed governing or power adjustments to AC load.
Background technology
The method of control alternating current machine is mainly the variable-frequency control technique that uses the IGBT formation and the soft starter for motor technology of using controllable silicon SCR to constitute at present.With control three phase alternating current motor be example, there are the following problems for prior art:
1, variable-frequency control technique is to reach the purpose that changes motor speed by frequency that change to supply with the motor alternating voltage.But, when the frequency of alternating voltage reduces, must reduce the amplitude of alternating voltage, otherwise the motor magnetic circuit will enter the zone of saturation and produce overcurrent.Therefore, adopt existing variable-frequency control technique control alternating current machine should pressure regulation frequency modulation again.Under the requirement that High Power Factor, no current impact, need adopt six switching devices (such as the IGBT power tube during pressure regulation, whenever, need two mutually, just, negative each one, three-phase just needs six) the design controllable rectification circuit, be used for ac voltage rectifier is become direct voltage, for follow-up inversion module provides DC bus-bar voltage.When carrying out frequency modulation control by inversion module, also need to use six switching devices (such as the IGBT power tube) that DC bus-bar voltage is reverse into three-phase alternating voltage, to drive the three phase electric machine running.Like this, in the main circuit power supply of three phase electric machine, amount to need use 12 IGBT power tubes carry out circuit design, complex structure not only, the cost height, but also can cause the reduction of reliability.
2, variable-frequency control technique is difficult to make alternating current machine in fourth quadrant work.The characteristics of fourth quadrant are that motor speed is negative value, and motor torque be on the occasion of, for example crane just needs its motor internal to be operated in fourth quadrant in transferring the process of weight.But because variable-frequency control technique is to change motor speed by the method that changes frequency, and frequency can not become negative value, and therefore wanting speed becomes negative value, can only change the phase sequence of motor.At this moment, in fact motor is not to be operated in fourth quadrant, but is operated in second quadrant, is in generating state.
3, the soft initiator that is made of controllable silicon SCR is the principal mode that is used for control alternating current machine soft start at present, and it adopts the mode of phase shift step-down to reach the purpose that reduces starting current, namely by reducing the starting current that starting resistor reduces motor.There are shortcomings such as power factor is low, torque/current ratio is low, starting current is big in this design.And the soft initiator that is made of SCR also needs more switch element, has complex structure, problem that cost is high equally.
For heterogeneous resistive AC load such as electric heating furnace or power regulating eqiupments, generally all be to adopt controllable silicon to carry out power adjustments, there are control circuit complexity, problem that power factor is low equally.
Summary of the invention
The present invention is in order to solve the existing existing control circuit complexity of AC load control system, problem that reliability is low, a kind of AC load control system is provided, by adopting diode to constitute the current lead-through ratio that matrix switch is regulated the AC load internal driving of flowing through, and then realization is to the control of AC load, thereby simplified the structure of control circuit, improved reliability of system operation.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of AC load control system comprises 2N diode, switching device and is used for the control module of the described switching device break-make of control that described N is the number of phases of AC load; Be connected with two diodes respectively at each phase winding of AC load or an end of resistance, in described two diodes, the anode of one of them diode connects this phase winding or resistance, negative electrode connects an end of the switch ways of described switching device, the other end of described switch ways connects the anode of another diode, and the negative electrode of described another diode connects this phase winding or resistance; The N phase winding of described AC load or the other end of resistance connect N cross streams voltage, and the control end of described switching device connects described control module.
Wherein a kind of design as described control module includes pulse generator in described control module, described pulse generator receives setting signal, and the uniform pulse signal that generates EDM Generator of Adjustable Duty Ratio exports the control end of described switching device to.
When described AC load was the alternating current machine of three-phase at least, described setting signal was rate setting signal; In described control module, also include the tachogenerator for detection of the alternating current machine rotating speed, described tachogenerator transfers to described pulse generator with detected motor speed signal, described pulse generator is poor according to rate setting signal and motor speed signal, regulates the duty ratio of the uniform pulse signal of its output.
When described AC load was the electric heating furnace of three-phase at least or power regulating eqiupment constant resistance sexual intercourse current load, the setting signal that described pulse generator receives was power setting signal.
As another design of described control module, when described AC load is the inductive ac motor of three-phase at least; Described control module can also adopt modulated signals generator, modulation signal generator and signal modulator to set up and form; Wherein, described signal modulator receives the carrier signal of modulated signals generator output and the modulation signal of modulation signal generator output, and then generates the control end that modulated pulse signal exports described switching device to.
Further, the carrier signal of described modulated signals generator generation fixed frequency exports described signal modulator to; Described modulation signal generator inbound pacing setting signal, and determine the frequency of the modulation signal of its output according to rate setting signal.
Further again, described signal modulator is modulated to the modulation signal that receives on the received carrier signal, and receives the modulation depth control signal simultaneously, the pulse duration of regulating the modulated pulse signal of its output according to described modulation depth control signal.
Preferably, when described AC load is alternating current machine, in described control system, energy absorption feedback circuit can also be set further, the switch ways that connects described switching device, when being operated in fourth quadrant, alternating current machine absorbs the energy of circuit feedback, to reach the purpose of design of energy savings.
As another application mode of described control system, AC load control system of the present invention can also be applied in the control of the soft start of alternating current machine.
When described AC load control system is used for that three phase alternating current motor carried out soft start, require the alternating current machine of star connection during for operation, a side that is used for connecting described control system at its each phase winding, a normally opened contact that connects A.C. contactor between per two phase windings, described A.C. contactor is its normally opened contact closure of control after the alternating current machine startup is finished, and three phase windings are connected into star.
And when described AC load control system is used for that three phase alternating current motor carried out soft start, require the alternating current machine of delta connection during for operation, its three phase winding connects described control system by a normally opened contact of first A.C. contactor separately, and described first A.C. contactor is its normally opened contact closure of control in the alternating current machine start-up course only; Also be connected with three normally opened contacts of second A.C. contactor between described three phase windings, described second A.C. contactor is its normally opened contact closure of control after the alternating current machine startup is finished, and three phase windings are connected into triangle.
Compared with prior art, advantage of the present invention and good effect are: AC load control system line construction of the present invention is simple, cost is low, good reliability.Use it in the speed regulating control of alternating current machine, not only can replace existing variable-frequency control technique realization to the accurate control of motor speed, and can make the fourth quadrant that is operated in of motor stabilizing, and power factor equals 1, thereby changed the s type torque characteristics that reason owing to reactance makes the alternating current machine that the power factor (PF) variation forms, the unstable operation section of original s type characteristic has been become stable active section.In addition, AC load control system of the present invention can also be applied in the control of the soft start of alternating current machine and the power control to electric heating furnace or the load of power regulating eqiupment constant resistance polyphase ac, compares traditional SCR control technology and has significant advantages such as power factor height, control performance be good.
After reading the detailed description of embodiment of the present invention by reference to the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the system construction drawing that AC load control system proposed by the invention is applied to a kind of embodiment of induction type three phase alternating current motor speed regulating control;
Fig. 2 is the system construction drawing that AC load control system proposed by the invention is applied to a kind of embodiment of winding-type three-phase AC electric machine speed regulation control;
Fig. 3 is the system construction drawing that AC load control system proposed by the invention is applied to another embodiment of induction type three phase alternating current motor speed regulating control;
Fig. 4 is the oscillogram of a kind of embodiment of the modulated pulse signal that generates of signal modulator shown in Figure 3;
Fig. 5 is the system construction drawing that AC load control system proposed by the invention is applied to a kind of embodiment of alternating current machine soft start control;
Fig. 6 is the system construction drawing that AC load control system proposed by the invention is applied to another embodiment of alternating current machine soft start control;
Fig. 7 is the system construction drawing that AC load control system proposed by the invention is applied to a kind of embodiment of resistive AC load power control.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
The present invention is based on forward Low ESR that diode has, the reverse characteristic of high impedance, utilize 2N diode to constitute the alternating-current switch of matrix type structure, be connected on each phase winding or resistance of AC load, connect two diodes on every phase winding or the resistance.Because the bearing power of diode is bigger, so the power of the switching device of driving diode break-make is also bigger.After adopting diode to form matrix switch, can use a switching device to control several roads alternating current circuit simultaneously.Like this, because the switching device that uses is considerably less, therefore, it is very simple that control circuit can become, and then the cost of product is minimized.
Elaborate concrete establishment structure and the application thereof of described AC load control system below by three specific embodiments.
Embodiment one, and referring to Fig. 1, shown in Figure 2, the AC load control system of present embodiment is mainly by 2N diode D
i, switching device Q1 and control module form, described N is the number of phases of AC load.Be that example describes with three phase alternating current motor M, this moment, N=3 namely needed 6 diode D1-D6 to form the matrix switch of two row, three row.The central point of alternating current machine M is taken apart, made a wherein end of three phase windings connect three-phase alternating-current supply, the other end connects one to one with three row diodes of described matrix switch respectively, namely connects the two-way diode at each phase winding.In actual application, all be provided with six binding posts on the terminal box of general three phase alternating current motor M, can connect three-phase alternating-current supply on three binding posts of U, V, W therein, connect described matrix switch at X, Y, three binding posts of Z.For the inductive ac motor, described X, Y, three binding posts of Z are connected with motor stator winding, as shown in Figure 1; And for the wound AC machine, described X, Y, three binding posts of Z are connected with the rotor winding, as shown in Figure 2.Concrete annexation for alternating current machine M and matrix switch, present embodiment is that example describes with the U phase winding among the alternating current machine M, described U phase winding connects two diode D1, D2 of first row, be connected with the anode of diode D1 and the negative electrode of diode D2 respectively, the switch ways of switching device Q1 is connected between the anode of the negative electrode of described diode D1 and diode D2.The connected mode of all the other two row diode D3-D6 and the first row diode D1, D2 are similar, are connected on the V phase winding and W phase winding of alternating current machine M, and by switching device Q1 it are carried out break-make control.The control end link control module of described switching device Q1 is controlled its switch ways conducting or shutoff by the pulse signal of control module output.
In the present embodiment, described switching device Q1 can adopt high-power FETs such as CMOS, IGBT to realize.Certainly, present embodiment is not limited in above giving an example.
As wherein a kind of design of described control module, can adopt pulse generator that switching device Q1 is carried out switch control, as shown in Figure 1 and Figure 2.The user can import setting signal by human-computer interaction devices such as potentiometer, keyboard, touch-screens, transfer to the uniform pulse signal (be the pulse signal of fixed frequency) of pulse generator to generate certain duty ratio, and then export the control end of switching device Q1 to, break-make sequential with control switch device Q1 reaches the control to AC load.Rotating speed with control alternating current machine M is that example describes, and pulse generator receives the rate setting signal Vs of user's input, and generates the uniform pulse signal of corresponding duty ratio, control switch device Q1 break-make according to the size of setting speed.During switching device Q1 conducting, the X of three phase alternating current motor M, Y, Z binding post are communicated with, be equivalent to three phase alternating current motor M is connected into star connection, and be the motor M power supply by three-phase alternating-current supply, make the motor M running.During switching device Q1 shutoff, the X of three phase alternating current motor M, Y, Z binding post disconnect, and have been equivalent to cut off the current supply circuit of alternating current machine M, and no current flows through the motor M stall among the alternating current machine M at this moment.Thus one, the duty ratio of the pulse signal by the output of regulating impulse generator can be regulated the current lead-through ratio that flows through motor M, and then be changed motor torque, realizes the adjusting to the motor M rotating speed.
The frequency of described uniform pulse signal can with the Frequency Synchronization of AC power, also can be asynchronous, present embodiment does not specifically limit this.
What above-mentioned control module adopted is a kind of control mode of open loop, when it is used for the wound AC machine, can obtain the sagging mechanical property of straight line, motor M can continuous operation first, fourth quadrant.
In order to realize the accurate control to the motor M rotating speed, can also in described control system, increase negative feedback links, as shown in Figure 1 and Figure 2, adopt tachogenerator to detect the current rotating speed of alternating current machine M, and then feed back motor speed signal Vo to pulse generator.Pulse generator is poor according to rate setting signal Vs and motor speed signal Vo's, the duty ratio of regulating the pulse signal of its output, and then motor speed is stabilized on the desired speed setting value of user.
For the alternating current machine in the crane, transferring when crane work in the process of weight, because it is constant to be applied to the phase sequence of AC power of alternating current machine M, control module is still exported the current lead-through ratio that the uniform pulse signal controlling flows through motor, thus motor torque still be on the occasion of; But this moment, motor can be owing to be reversed by the pulling force of weight decline, so motor speed is negative value, can realize just that thus motor M is at the steady operation of fourth quadrant.Because crane is the meeting produce power in transferring the process of weight, for fear of described energy consumption on the motor winding, present embodiment also designs in control system energy absorption feedback circuit, as shown in Figure 1 and Figure 2, be connected with the switch ways of described switching device Q1, absorb described energy and feed back to electrical network or energy storage device, to reach the purpose of energy savings.
When the control system of present embodiment is applied to the speed regulating control of alternating current machine, be specified owing to be applied to the voltage of motor, so magnetic field is rated condition, according to the motor torque formula:
M?=?K?*?U?I?cosφ；
Wherein, M is torque; K is the electric machine structure parameter; U is electric moter voltage; I is current of electric; Cos φ is power factor; Therefore, motor torque depends on rotor electric current and power factor.When adopting the uniform pulse signal controlling, its power factor equals 1, when pulse duty factor is constant, along with the voltage of the increasing of revolutional slip (frequency of AC power and the frequency of rotor poor), rotor loop also strengthens, also proportional increasing of electric current of rotor loop, make the torque of motor strengthen, rotating speed reduces, be that transverse axis, rotating speed are in the coordinate system of the longitudinal axis in torque namely, the characteristic that the torque characteristics of motor becomes to tilt to descend, the straight line that when winding motor, more descends close to inclination.When the duty ratio of uniform pulse signal strengthened, characteristic flattened; When duty ratio reduces, the characteristic steepening.
Certainly, for described switching device Q1, also can adopt modulated pulse signal that it is carried out switch control.At this moment, can adopt modulation signal generator, modulated signals generator and signal modulator to set up described control module, as shown in Figure 3.Rotating speed with control triphase induction type alternating current machine is that example describes.Receive the rate setting signal Vs that the user imports by modulation signal generator, and then the modulation signal of generation certain frequency exports described signal modulator to.Described signal modulator receives the carrier signal of the fixed frequency of modulated signals generator output simultaneously, modulation signal is modulated on the described carrier signal then, and utilize its modulation depth control signal that receives that the pulse duration of described carrier signal is regulated, thereby generate modulated pulse signal as shown in Figure 4.Among Fig. 4, t is the cycle of modulated signals; T is the cycle of modulation signal; Vmax is the conducting current potential of switching device Q1; Vmin is the pass power down bit of switching device Q1.Can reach the purpose of regulating motor speed by the frequency that changes modulation signal; By increasing the value of modulation depth control signal, can strengthen the pulse duration of the modulated pulse signal of signal modulator output, the ON time that prolongs switching device Q1, and then increase the rotor electric current, and motor torque is improved, motor characteristic hardness strengthens.
When switching device Q1 adopts modulated pulse signal control, because the energy in the stator loop of alternating current machine is from electrical network, so can form rotating magnetic field in motor gas-gap.But in rotor loop, because electric current produces by induction mode, therefore be subjected to the control of modulated pulse signal.And the frequency of induced current is identical with the frequency of modulated pulse signal.
Experimental results show that: be under 50 hertz the situation at mains frequency, when the modulating frequency of modulated pulse signal during less than 50 hertz, the rotor direction of rotation is identical with the direction of stator rotating magnetic field; And when the modulating frequency of modulated pulse signal was higher than 50 hertz, the rotor direction of rotation was opposite with the direction of stator rotating magnetic field, and its action principle is equivalent to the double-fed of the rotor loop feed of equivalence and regulates.
In the present embodiment, described rate setting signal and modulation depth control signal can be input in the described control system by the human-computer interaction device, are used for motor is carried out speed regulating control.
Certainly, described control module also can adopt other multiple designs, and present embodiment is not limited in above giving an example.When the number of phases of alternating current machine greater than 3 the time, can adopt more that the described matrix switch of multichannel diode pair carries out the columns expansion, its circuit connecting mode is copied Fig. 1-shown in Figure 3, present embodiment is not done repeat specification at this.
Embodiment two, and present embodiment is applied to embodiment one described AC load control system in the soft start-up process of three phase alternating current motor.For the three phase alternating current motor that adopts star connection, the central point of motor winding can be taken apart, one end of three phase windings (being the UVW binding post) connects AC power, the other end (being the XYZ binding post) connects the matrix switch of two row, three row, as shown in Figure 5, and at normally opened contact Z1 of cross-over connection respectively between any two of XYZ binding post, three normally opened contact Z1 are the normally opened contact of an A.C. contactor.Described A.C. contactor is controlled its normally opened contact Z1 and is disconnected in the electric motor starting process.At this moment, control module (among Fig. 5 be that example describe with the pulse generator) is according to given signal production burst signal, and the starting current of motor is flow through in control.In this enforcement, can control the size of starting current according to actual needs, wherein, the width of pulse determines the size of starting current and the size of moment.After electric motor starting was finished, A.C. contactor was controlled its normally opened contact Z1 closure, that is, the motor winding is connected according to star connection, makes motor enter normal operating condition.
For the three phase alternating current motor that adopts delta connection, the central point of motor winding can be taken apart, one end of three phase windings (being the UVW binding post) connects AC power, the other end (being the XYZ binding post) connects the matrix switch of two row, three row on the one hand separately by one road normally opened contact Z2, described three road normally opened contact Z2 are the normally opened contact of first A.C. contactor, as shown in Figure 6; Three road normally opened contact Z3 by second A.C. contactor realize that X is connected with the indirect of U with W, Z with V, Y on the other hand.In the electric motor starting process, first A.C. contactor is controlled its normally opened contact Z2 closure, second A.C. contactor is controlled its normally opened contact Z3 and is disconnected, at this moment, control module (among Fig. 6 be that example describe with the pulse generator) is according to given signal production burst signal, and the starting current (can control the size of starting current according to actual needs) of motor is flow through in control.After electric motor starting was finished, first A.C. contactor was controlled its normally opened contact Z2 and is disconnected, and second A.C. contactor is controlled its normally opened contact Z3 closure, that is, the motor winding is connected according to delta connection, makes motor enter normal operating condition.Described first A.C. contactor and the mutual locking of second A.C. contactor.Certainly, also Z3 can be changed into the normally-closed contact of first A.C. contactor, can realize the soft start control to alternating current machine equally.
Whether start for motor and to finish, can adopt existing multiple mode to judge, such as by detecting the modes such as time of current of electric or control soft start, present embodiment does not specifically limit this.
Embodiment three, present embodiment is applied to embodiment one described AC load control system in other AC load except motor, have three-phase or more heterogeneous resistance and tradition such as electric heating furnace, power regulating eqiupment etc. and adopt in the resistive AC load of star connection, be used for the power of AC load is controlled.As shown in Figure 7, be that example describes with the three-phase alternating current load.
Same, the central point of the three-phase resistance of AC load is taken apart, its three-phase terminal UVW that connects AC power originally still connects AC power, and the other end XYZ of three-phase resistance connects the described matrix switch that is constituted by a diode.Control module receives the power setting signal of user's input, and then generates the uniform pulse signal of certain duty ratio, transfers to the control end of switching device Q1, and it is carried out switch control, and then reaches effective control to bearing power by changing load current.
In order to realize the accurate control of AC load power, can also further design negative feedback links, namely in control system, increase power sensor, detect the power of AC load, and detected power signal fed back to control module, with the duty ratio of the pulse signal of regulating its output, and then bearing power can be stabilized on the desired setting power value of user.
Certainly; the above only is a kind of preferred implementation of the present invention, for those skilled in the art, and under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. AC load control system is characterized in that: comprise 2N diode, a switching device and be used for the control module of the described switching device break-make of control, described N is the number of phases of AC load; Described AC load is the inductive ac motor of three-phase at least, end at each phase winding of AC load is connected with two diodes respectively, in described two diodes, the anode of one of them diode connects this phase winding, negative electrode connects an end of the switch ways of described switching device, the other end of described switch ways connects the anode of another diode, and the negative electrode of described another diode connects this phase winding; The other end of the N phase winding of described AC load connects N cross streams voltage, and the control end of described switching device connects described control module; In described AC load control system, also include energy absorption feedback circuit, connect the switch ways of described switching device, when alternating current machine is operated in fourth quadrant, absorb the energy of circuit feedback; In described control module, include modulated signals generator, modulation signal generator and signal modulator, described signal modulator receives the carrier signal of modulated signals generator output and the modulation signal of modulation signal generator output, and then generates the control end that modulated pulse signal exports described switching device to.
2. AC load control system according to claim 1 is characterized in that: the carrier signal that described modulated signals generator generates fixed frequency exports described signal modulator to; Described modulation signal generator inbound pacing setting signal, and determine the frequency of the modulation signal of its output according to rate setting signal.
3. AC load control system according to claim 2, it is characterized in that: described signal modulator is modulated to the modulation signal that receives on the received carrier signal, and receive the modulation depth control signal simultaneously, the pulse duration of regulating the modulated pulse signal of its output according to described modulation depth control signal.
4. according to each described AC load control system in the claim 1 to 3, it is characterized in that: when described AC load control system is used for that three phase alternating current motor carried out soft start, require the alternating current machine of star connection during for operation, a side that is used for connecting described control system at its each phase winding, a normally opened contact that connects A.C. contactor between per two phase windings, described A.C. contactor is its normally opened contact closure of control after the alternating current machine startup is finished, and three phase windings are connected into star.
5. according to each described AC load control system in the claim 1 to 3, it is characterized in that: when described AC load control system is used for that three phase alternating current motor carried out soft start, require the alternating current machine of delta connection during for operation, its three phase winding connects described control system by a normally opened contact of first A.C. contactor separately, and described first A.C. contactor is its normally opened contact closure of control in the alternating current machine start-up course only; Also be connected with three normally opened contacts of second A.C. contactor between described three phase windings, described second A.C. contactor is its normally opened contact closure of control after the alternating current machine startup is finished, and three phase windings are connected into triangle.
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| CN103312258B (en) * | 2013-06-26 | 2016-06-15 | 东营市凌通石油机械制业有限责任公司 | Electric machine control system |
| JP6121602B1 (en) * | 2016-07-20 | 2017-04-26 | 巴工業株式会社 | Start-up method of three-phase induction motor and decanter type centrifugal separator |
| CN110426600B (en) * | 2019-08-21 | 2023-03-28 | 薄焕林 | Current loop correlation sampling method for detecting island effect |
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| CN2182494Y (en) * | 1993-12-06 | 1994-11-09 | 浙江大学 | Rotor chopping speed-regulating device for asynchronous motor |
| CN2322319Y (en) * | 1997-12-16 | 1999-06-02 | 罗建春 | Motor energy-saving control box |
| CN2502451Y (en) * | 2001-08-27 | 2002-07-24 | 蒋贞荣 | Wound rotor asynchronous motor cascade chopping speed control device |
| CN201985813U (en) * | 2011-05-06 | 2011-09-21 | 薄焕林 | Alternating current load control system |
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|---|---|---|---|---|
| CN2079831U (en) * | 1990-10-26 | 1991-06-26 | 浙江工学院 | Serial regulator for diffierential thyristor inverter |
| CN2182494Y (en) * | 1993-12-06 | 1994-11-09 | 浙江大学 | Rotor chopping speed-regulating device for asynchronous motor |
| CN2322319Y (en) * | 1997-12-16 | 1999-06-02 | 罗建春 | Motor energy-saving control box |
| CN2502451Y (en) * | 2001-08-27 | 2002-07-24 | 蒋贞荣 | Wound rotor asynchronous motor cascade chopping speed control device |
| CN201985813U (en) * | 2011-05-06 | 2011-09-21 | 薄焕林 | Alternating current load control system |
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