CN104270057B - A kind of series excited machine control system, series excited machine and washing machine - Google Patents
A kind of series excited machine control system, series excited machine and washing machine Download PDFInfo
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- CN104270057B CN104270057B CN201410490753.5A CN201410490753A CN104270057B CN 104270057 B CN104270057 B CN 104270057B CN 201410490753 A CN201410490753 A CN 201410490753A CN 104270057 B CN104270057 B CN 104270057B
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Abstract
The invention belongs to motor control technology field, there is provided a kind of series excited machine control system, series excited machine and washing machine.When series excited machine needs to switch to high-speed cruising state, make series excited machine that high-speed cruising is realized in the case of Alternating Current Power Supply in the presence of the first power switching switch and the second power switching switch, and then the serious problem of brush partial wear that series excited machine occurs in direct current supply and high-speed cruising is overcome, contribute to extension brush life and reduce noise；And when series excited machine needs to switch to low-speed run state, can make series excited machine that low cruise is realized in the case of direct current supply again in the presence of the first power switching switch and the second power switching switch, so as to the temperature rise of the iron loss and copper loss that effectively reduce series excited machine, the efficiency for improving series excited machine, the startability for improving series excited machine and reduction motor stator, rotor and brush, and be conducive to extension brush life and reduce noise.
Description
Technical field
The invention belongs to motor control technology field, more particularly to a kind of series excited machine control system, series excited machine and wash
Clothing machine.
Background technology
At present, series excited machine is widely used in the electric power such as washing machine, sightseeing bus as main driver part
Driving equipment, when controlling series excited machine to work, the scheme for generally being used is as shown in figure 1, it is to control electricity by host computer 100
Source switch 600 is closed and introduces alternating current to semiconductor switch device 200 from AC power AC, then by the basis of main control chip 300
The motor speed signal fed back during the detection motor speed of tachometer circuit 400 exports the switch controlling signal of corresponding dutycycle to partly
Conductor switching device 200, then make-break operation of the semiconductor switch device 200 according to the corresponding dutycycle of switch controlling signal execution
To adjust the alternating current of output to series excited machine 500, so that series excited machine 500 is maintained in the default range of speeds.In addition,
Control rotating speed to switch switch 700 by host computer 100 to be connected between the stator line 501 and stator line 503 of series excited machine 500
Switching is connect to realize switching of the series excited machine 500 between low-speed run state high, when rotating speed switching switch 700 connects series excitation electricity
During the stator line 501 of machine 500, series excited machine 500 enters low-speed run state, when rotating speed switching switch 700 connects series excited machine
During 500 stator line 503, series excited machine 500 enters high-speed cruising state；And the course changing control of series excited machine 500 then passes through
The control of host computer 100 turns to switching switch 800 to realize.For above-mentioned scheme, because no matter series excited machine is operate on
High-speed cruising state or low-speed run state, are all driven by alternating current, so series excited machine holds in low cruise
Easily there is problems with：
(1) iron loss, copper loss are excessive and efficiency is low；
(2) temperature rise of stator, rotor and brush is too high；
(3) start overtension and cause startability poor；
(4) noise is big.
The above mentioned problem existing in low cruise in order to solve series excited machine, prior art provides another kind side
Case, as shown in Fig. 2 the program is that filter rectifier 900 is added on the basis of scheme shown in Fig. 1 to semiconductor switching device
The alternating current that part 200 is exported is filtered and forms direct current for series excited machine is powered with after rectification treatment, so can be in string
Swash when motor is in low-speed run state and reduce its iron loss and copper loss, reduce the temperature rise of stator, rotor and brush, improve startability
Noise and can be reduced.However, above-mentioned effect is realized in low cruise because direct current supply mode is suitable only for series excited machine, but
This is not particularly suited for series excited machine and realizes high-speed cruising, and the mode of direct current supply can cause series excited machine in high-speed cruising because of electricity
Brush left and right partial wear seriously shortens brush life and the big problem of noise.
In summary, prior art cannot be realized reducing motor iron loss and copper loss, raising in series excited machine low cruise
The startability of electric efficiency, the temperature rise for reducing motor stator, rotor and brush and raising motor, and in series excited machine at a high speed
Reduce brush partial wear, extension brush life during operation and reduce noise.
The content of the invention
It is an object of the invention to provide a kind of series excited machine control system, it is intended to solve existing for prior art cannot
Realize reducing motor iron loss and copper loss in series excited machine low cruise, improve electric efficiency, reduce motor stator, rotor and electricity
The temperature rise of brush and the startability of raising motor, and reduce brush partial wear, extension brush in series excited machine high-speed cruising
Life-span and the problem of reduction noise.
The present invention is achieved in that a kind of series excited machine control system, and it is connected with host computer, and defeated including alternating current
Go out circuit, direct current output circuit, rotating speed switching switch and turn to switching switch, under the control of the host computer, the friendship
Stream electricity output circuit exports corresponding positive half-wave alternating current according to the rotating speed of series excited machine, and exports minus half alternating current wave simultaneously,
The direct current output circuit carries out defeated after AC-DC conversion treatment to the positive half-wave alternating current and minus half alternating current wave
Go out direct current, the rotating speed switching switch carries out low speed switching control high under the control of the host computer to the series excited machine
System, the switching switch that turns to carries out steering switching control under the control of the host computer to the series excited machine；
The series excited machine control system also includes the first power switching switch and the second power switching switch；
When the series excited machine is switched to high-speed cruising state by rotating speed switching switch described in the PC control, institute
The first power switching switch described in PC control and second power switching switch are stated respectively by the positive half-wave alternating current
Exported to rotating speed switching switch and described steering with minus half alternating current wave and switch switch；
When the series excited machine is switched to low-speed run state by rotating speed switching switch described in the PC control, institute
State the first power switching switch described in PC control and the direct current electricity output to the rotating speed is switched into switch, and control simultaneously
The second power switching switch stops exporting minus half alternating current wave to the steering switching switch.
In summary, when series excited machine needs to switch to high-speed cruising state, by the first power switching switch and second
Positive half-wave alternating current and minus half alternating current wave are exported to rotating speed to switch switch and turn to and switch switch by power switching switch respectively,
So that series excited machine realizes high-speed cruising in the case of Alternating Current Power Supply, and then series excited machine is overcome in direct current supply and high speed
The serious problem of the brush partial wear that occurs during operation, contributes to extension brush life and reduces noise；And in series excited machine
When needing to switch to low-speed run state, direct current electricity output to rotating speed is switched switch by the first power switching switch, and second supplies
TURP changes switch to be stopped exporting minus half alternating current wave to switching switch is turned to, so that series excited machine is in the case of direct current supply
Realize low cruise such that it is able to effectively reduce iron loss and copper loss, the efficiency of raising series excited machine, the raising string of series excited machine
Swash the startability of motor and reduce the temperature rise of motor stator, rotor and brush, and be conducive to extending brush life and reduction
Noise.
The invention provides another series excited machine control system, it is connected with host computer, and including power switch, motor
Tachometer circuit, main control chip, rotating speed switching switch and steering switching switch, the power switch is under the control of the host computer
Close and introduce positive half-wave alternating current from AC power, the motor speed measuring circuit carries out Rotating speed measring to series excited machine and feeds back
, to the main control chip, the rotating speed switching switch is under the control of the host computer to the series excited machine for motor speed signal
Low speed switching control high is carried out, the steering switching switch is turned under the control of the host computer to the series excited machine
Switching control；
The series excited machine control system also includes：Filter circuit, regulator rectifier circuit, current sampling circuit, power are opened
Close device, the first power switching switch and the second power switching switch；
The filter circuit is exported to the regulator rectifier circuit, institute after treatment is filtered to the positive half-wave alternating current
Regulator rectifier circuit is stated to enter minus half alternating current wave that the positive half-wave alternating current for processing after filtering and the AC power are exported
Direct current to first power switching is exported after the treatment of row rectifying and voltage-stabilizing to switch, the current sampling circuit is steady to the rectification
The loop current of volt circuit detect and feedback current sampled signal is to the main control chip, and the main control chip is according to
Motor speed signal and the current sampling signal output copped wave process signal, the device for power switching according to the copped wave at
Reason signal first power switching is switched exported loop direct current carry out feeding back to the rectification after copped wave treatment it is steady
Volt circuit；
When the series excited machine is switched to high-speed cruising state by rotating speed switching switch described in the PC control, institute
The first power switching switch described in PC control and second power switching switch are stated respectively by the positive half-wave alternating current
Exported to rotating speed switching switch and described steering with minus half alternating current wave and switch switch；
When the series excited machine is switched to low-speed run state by rotating speed switching switch described in the PC control, institute
State the first power switching switch described in PC control and the direct current electricity output to the rotating speed is switched into switch, and control simultaneously
The second power switching switch stops exporting minus half alternating current wave to the steering switching switch.
For above-mentioned another series excited machine control system, it needs to switch to high-speed cruising state in series excited machine
When, the positive half-wave alternating current for respectively being exported AC power by the first power switching switch and the second power switching switch and negative half
Alternating current wave exports to rotating speed and switches switch and turn to switching switch, so that series excited machine realizes height in the case of Alternating Current Power Supply
Speed operation, and then the serious problem of brush partial wear that series excited machine occurs in direct current supply and high-speed cruising is overcome,
Contribute to extension brush life and reduce noise；And when series excited machine needs to switch to low-speed run state, by the first power supply
Direct current electricity output after copped wave is processed to rotating speed is switched switch by switching switch, and controls the second power switching to switch simultaneously
Stop exporting minus half alternating current wave to switching switch is turned to, so that series excited machine realizes that low speed is transported in the case of direct current supply
OK such that it is able in the iron loss and copper loss for effectively reducing series excited machine, the efficiency for improving series excited machine, improve opening for series excited machine
While the temperature rise of dynamic performance and reduction motor stator, rotor and brush, further reduce the static magnetic field iron of series excited machine
Consumption, and be conducive to extension brush life and reduce noise.
It is of the invention also to provide based on the control action that above two series excited machine control system is realized to series excited machine
A kind of series excited machine including above-mentioned any one series excited machine control system, series excited machine control system may be disposed at series excitation
On the drive end bearing bracket or rear end cap of motor.
In can be applied to washing machine due to series excited machine, so present invention also offers a kind of washing machine, it includes upper
Machine and above-mentioned series excited machine.
Brief description of the drawings
Fig. 1 is the structural representation of the existing series excited machine control program involved by background technology；
Fig. 2 is the structural representation of another existing series excited machine control program involved by background technology；
Fig. 3 is the cross-sectional view of the series excited machine involved by the embodiment of the present invention；
Fig. 4 is the structure chart of the series excited machine control system that first embodiment of the invention is provided；
Fig. 5 is the electric efficiency test and simulation comparison figure involved by first embodiment of the invention；
Fig. 6 is the side view of the series excited machine involved by the embodiment of the present invention；
Fig. 7 is the exemplary circuit structure chart of the series excited machine control system shown in Fig. 4；
Fig. 8 is the structure chart of the series excited machine control system that second embodiment of the invention is provided；
Fig. 9 is the electric efficiency test and simulation comparison figure involved by second embodiment of the invention；
Figure 10 is another structure chart of the series excited machine control system that second embodiment of the invention is provided；
Figure 11 is the exemplary circuit structure chart of the series excited machine control system shown in Fig. 8；
Figure 12 is the exemplary circuit structure chart of the series excited machine control system shown in Figure 10.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As a example by application of the embodiment of the present invention by series excited machine in washing machine, series excited machine and its control system are carried out
Describe in detail, washing machine includes host computer and series excited machine, series excited machine includes series excited machine control system, and series excited machine control
System processed is arranged on the drive end bearing bracket of series excited machine (as shown in Figure 3) or rear end cap, and host computer controls system by series excited machine
System is controlled, to realize low-speed run state switching high and steering switching to series excited machine.
Specific embodiment is below solved to be described in detail above-mentioned series excited machine control system：
Embodiment one：
Fig. 4 shows the structure of the series excited machine control system that first embodiment of the invention is provided, for convenience of description, only
The part related to first embodiment of the invention is shown, details are as follows：
Series excited machine control system 100 is connected with host computer 200, and including alternating current output circuit 101, direct current electricity output
Circuit 102, rotating speed switching switch 103 and steering switching switch 104, under the control of host computer 200, alternating current output circuit
101 export corresponding positive half-wave alternating current according to the rotating speed of series excited machine 300, and export minus half alternating current wave, direct current simultaneously
The positive half-wave alternating current of output circuit 102 pairs and minus half alternating current wave export direct current, rotating speed after carrying out AC-DC conversion treatment
Switching switch 103 carries out low speed switching control high under the control of host computer 200 to series excited machine 300, turns to switching switch 104
Steering switching control is carried out to series excited machine 300 under the control of host computer 200.
Series excited machine control system 100 also includes the first power switching switch 105 and the second power switching switch 106；The
One power switching switch 105 and the second power switching switch 106 are connected with host computer 200, the first power switching switch 105
First input end and the second input connect the positive output end and direct current output circuit 102 of alternating current output circuit 101 respectively
Positive input terminal, the first power switching switch 105 the second input and output end connect direct current output circuit 102 respectively
Output end and rotating speed switching switch 103, the first input end connection direct current output circuit 102 of the second power switching switch 106
Earth terminal, the negative output terminal and direct current of the second output end connection alternating current output circuit 101 of the second power switching switch 106
The negative input end of electricity output circuit 102, the output end connection of the second power switching switch 106 turns to switching switch 104；Alternating current
The positive output end and negative output terminal of output circuit 101 connect the positive input terminal and negative input end of direct current output circuit 102 respectively,
Alternating current output circuit 101 is also connected with the first of series excited machine 300 line 31 and second that tests the speed and tests the speed line 32, rotating speed switching switch
103 are all connected with host computer 200 with switching switch 104 is turned to, and rotating speed switching switchs 103 and is also connected with the first of series excited machine 300
The stator line 303 of stator line 301 and the 3rd, turns to the first brush wire 310, second that switching switch 104 is also connected with series excited machine 300
The stator line 302 of brush wire 320 and second.
It is upper when series excited machine 300 is switched to high-speed cruising state by the control rotating speed switching of host computer 200 switch 103
The first power switching of the control switch 105 of machine 200 and the second power switching switch 106 by above-mentioned positive half-wave alternating current and are born respectively
Half alternating current wave is exported to rotating speed switching switch 103 and turns to switching switch 104.
It is upper when series excited machine 300 is switched to low-speed run state by the control rotating speed switching of host computer 200 switch 103
Machine 200 controls the first power switching switch 105 by above-mentioned direct current electricity output to rotating speed switching switch 103, and controls the simultaneously
Two power switchings switch 106 stops exporting above-mentioned minus half alternating current wave to steering switching switch 104.
Therefore, when series excited machine 300 needs to switch to high-speed cruising state, by the first power switching switch 105 and the
Positive half-wave alternating current and minus half alternating current wave are exported to rotating speed switching switch 103 and turned to by two power switchings switch 106 respectively
Switching switch 104, so that series excited machine 300 realizes high-speed cruising in the case of Alternating Current Power Supply, and then overcomes series excited machine
The serious problem of the 300 brush partial wears occurred in direct current supply and high-speed cruising, contributes to extension brush life and subtracts
Small noise；And when series excited machine 300 needs to switch to low-speed run state, 105 are switched by direct current by the first power switching
Export to rotating speed switching switch 103, and minus half alternating current wave is exported to steering switching and opened by the stopping of the second power switching switch 106
104 are closed, so that series excited machine 300 realizes low cruise in the case of direct current supply such that it is able to effectively reduce series excitation electricity
The iron loss and copper loss of machine 300, the efficiency for improving series excited machine 300, the startability for improving series excited machine and reduction motor are determined
The temperature rise of son, rotor and brush, and be conducive to extension brush life and reduce noise.
Wherein, for the efficiency of raising series excited machine 300, electric efficiency test and the simulation comparison shown in Fig. 5 be can refer to
Figure, for the existing motor control schemes shown in Fig. 1, it is solid in rotating speed that curve L1 and curve L2 in Fig. 5 are respectively series excited machine
It is set to testing efficiency change curve and simulation efficiency change curve under 600rpm (rev/min) and different torques；And above-mentioned
Under the control of series excited machine control system 100, testing efficiency change curve and simulation efficiency the change curve difference of series excited machine
It is curve L3 and curve L4 in Fig. 5.Compare with L1 and L2 respectively by by L3 and L4, in series excited machine control system
Under 100 control, the efficiency of series excited machine 300 improves about 10%~15% relative to prior art.
For reducing motor stator, rotor and the temperature rise of brush, for same series excited machine, in the institute of application drawing 1 respectively
The scheme that the scheme and the present embodiment Fig. 4 shown are provided, according to rotating speed be 710rpm, torque is 0.6N.m and steering is dextrorotation
Continuously resulting temperature rise test data is as shown in the table after operation 30 minutes to turn the test condition of CW：
As can be known from the above table, under the control of the series excited machine control system that the present embodiment Fig. 4 is provided, series excited machine is in low speed
Stator temperature rise during operation reduces about 20K relative to the stator temperature rise of Fig. 1 schemes, and rotor temperature rise reduces about 30K, in series excitation
The temperature of the left brush (as shown in Figure 6) of the terminal board side of motor reduces about 40 DEG C, in the non-terminal board side of series excited machine
The temperature of right brush (as shown in Figure 6) reduces about 50 DEG C.
Specifically, Fig. 7 shows the exemplary circuit structure of above-mentioned series excited machine control system, details are as follows：
Alternating current output circuit 101 includes AC power AC, the first relay K1, IGCT SCR, the first piezo-resistance
TVR1, main control chip 1011 and motor speed measuring circuit 1012；
The positive output end of AC power AC connects the movable contact of the first relay K1, and the normally opened contact of the first relay K1 connects
Connect the colelctor electrode of IGCT SCR and the first end of the first piezo-resistance TVR1, the emitter stage of IGCT SCR and AC power AC's
Negative output terminal respectively as alternating current output circuit 101 positive output end and negative output terminal, main control chip 1011 connection IGCT
The base stage and motor speed measuring circuit 1012 of SCR, motor speed measuring circuit 1012 are also connected with the first of series excited machine 300 and test the speed the He of line 31
Second tests the speed line 32.
First relay K1 closed under the control of host computer 200 and from AC power AC introduce alternating current positive half-wave to
IGCT SCR, motor speed measuring circuit 1012 carries out Rotating speed measring and feeds back motor speed signal to master control core to series excited machine 300
Piece 1011, main control chip 1011 has the copped wave process signal of corresponding dutycycle to control crystalline substance according to motor speed signal output
Brake tube SCR carries out copped wave treatment to the positive half-wave of alternating current.Wherein, IGCT SCR may be replaced by any one and possess out
Close the semiconductor devices of characteristic.
Direct current output circuit 102 includes：
Inductance L, electric capacity C, resistance R, rectifier bridge BD and the second piezo-resistance TVR2；
The first end of inductance L is the positive input terminal of direct current output circuit 102, and second end of inductance L is with rectifier bridge BD's
Positive input terminal 1 is connected to the first end of electric capacity C altogether, the first end of the second end connection resistance R of electric capacity C, second end of resistance R with it is whole
The common contact of the negative input end 2 of stream bridge BD is the negative input end of direct current output circuit 102, the output end 3 of rectifier bridge BD and the
The common contact of the first end of two piezo-resistance TVR2 is the output end of direct current output circuit 102, the ground terminal 4 of rectifier bridge BD and the
The common contact at second end of two piezo-resistance TVR2 is the earth terminal of direct current output circuit 102.Wherein, inductance L and electric capacity C structures
Treatment is filtered to the positive half-wave of alternating current into LC filter circuits, output is straight after rectifier bridge BD carries out rectification treatment to alternating current
Stream electricity.
The power supply of the connection of movable contact 3 first that rotating speed switching switch 103 is specially the second relay K2, the second relay K2 is cut
The output end of switch 105 is changed, first stationary contact 1 and the second stationary contact 2 of the second relay K2 connect series excited machine 300 respectively
First stator line 301 and the 3rd stator line 303.Wherein, the second relay K2 according to the control of host computer 200 to series excited machine
300 carry out low speed switching control high, when the movable contact 3 of the second relay K2 is connected with the first stationary contact 1, series excited machine 300
Into low-speed run state, and when the movable contact 3 of the second relay K2 is connected with the second stationary contact 2, series excited machine 300 enters
High-speed cruising state.
Turning to switching switch 104 includes the 3rd relay K3 and the 4th relay K4, the 3rd relay K3 and the 4th relay
Device K4 is connected with host computer 200, and the movable contact of the 3rd relay K3 connects the output end of the second power switching switch 106, the
First stationary contact 1 of three relay K3 and first stationary contact 1 of the 4th relay K4 are connected to the first brush of series excited machine 300 altogether
Line 310, second stationary contact 2 of the 3rd relay K3 and second stationary contact 2 of the 4th relay K4 are connected to series excited machine 300 altogether
Second brush wire 320, the movable contact 3 of the 4th relay K4 connects the second stator line 302 of series excited machine 300.
Wherein, the 3rd relay K3 and the 4th relay K4 under the control of host computer 200 to 300 turns of series excited machine
To switching control, when the movable contact 3 of the 3rd relay K3 connects the brush wire of series excited machine 300 by its first stationary contact 1
310, and the 4th relay K4 movable contact 3 by its second stationary contact 2 connect series excited machine 300 brush wire 320 when, series excitation
Motor 300 is to rotate forward；When the movable contact 3 of the 3rd relay K3 connects the electricity of series excited machine 300 by its second stationary contact 2
Brush line 320, and the 4th relay K4 movable contact 3 by its first stationary contact 1 connect series excited machine 300 brush wire 310 when,
Series excited machine 300 is to rotate backward.
First power switching switch 105 is specially the 5th relay K5, first stationary contact 1, second of the 5th relay K5
Stationary contact 2 and movable contact 3 are respectively first input end, the second input and the output end of the first power switching switch 105.
Second power switching switch 106 is specially the 6th relay K6, first stationary contact 1, second of the 6th relay K6
Stationary contact 2 and movable contact 3 are respectively first input end, the second input and the output end of the second power switching switch 106.
Wherein, when host computer 200 controls the second relay K2 that series excited machine 300 is switched into high-speed cruising state, on
Position machine 200 controls first stationary contact 1 of the 5th relay K5 to be connected with movable contact 3, and controls the of the 6th relay K6 simultaneously
Two stationary contacts 2 are connected with movable contact 3.When host computer 200 controls the second relay K2 that series excited machine 300 is switched into low cruise
During state, host computer 200 controls second stationary contact 2 of the 5th relay K5 to be connected with movable contact 3, and controls the 6th relay simultaneously
First stationary contact 1 of device K6 is connected with movable contact 3.
For above-mentioned series excited machine control system, motor speed measuring circuit 1012 is detected for conventional to motor speed
Circuit, main control chip 1011 can be specifically the conventional IC chip comprising microprocessing unit and drive circuit, micro-
Processing unit outputs control signals to drive circuit according to the motor speed signal that motor speed measuring circuit 1012 is fed back, and drives electricity
Road exports the duty cycle of switching that corresponding copped wave process signal controls above-mentioned IGCT SCR according to the control signal, so that brilliant
Brake tube SCR correspondingly carries out copped wave treatment to the positive half-wave of alternating current, and inductance L and electric capacity C constitutes LC filter circuits to above-mentioned warp
The positive half-wave alternating current for crossing copped wave treatment is filtered treatment, and the positive half-wave for processing after filtering is exchanged by rectifier bridge BD then
Electricity and minus half alternating current wave of AC power AC outputs carry out exporting direct current to the 5th relay K5 after rectification treatment, by the
The power supply mode of five relay K5 and the 6th relay K6 to series excited machine 300 under the control of host computer 200 is switched over, can
Enable series excited machine 300 that high-speed cruising is realized in Alternating Current Power Supply, and low cruise is realized in direct current supply.
Embodiment two：
Fig. 8 shows the structure of the series excited machine control system that second embodiment of the invention is provided, for convenience of description, only
The part related to second embodiment of the invention is shown, details are as follows：
Series excited machine control system 100 is connected with host computer 200, and including power switch 107, motor speed measuring circuit
1012nd, main control chip 1011, rotating speed switching switch 103 and steering switching switch 104；Control of the power switch 107 in host computer 200
The lower closure of system simultaneously introduces positive half-wave alternating current from AC power AC, and motor speed measuring circuit 1012 carries out rotating speed to series excited machine 300
Motor speed signal to main control chip 1011 is detected and feeds back, rotating speed switching switch 103 is under the control of host computer 200 to series excitation
Motor 300 carries out low speed switching control high, and turn to switching switch 104 is carried out under the control of host computer 200 to series excited machine 300
Turn to switching control.
Series excited machine control system 100 also includes：Filter circuit 108, regulator rectifier circuit 109, current sampling circuit
110th, device for power switching 111, the first power switching switch 105 and the second power switching switch 106.
Filter circuit 108 is connected between the negative output terminal of the output end of power switch 107 and AC power AC, and rectification is steady
The first input end of the positive input terminal of volt circuit 109 and the first power switching switch 105 is connected to the output of power switch 107 altogether
End, the negative output terminal of the negative input end connection AC power AC of regulator rectifier circuit 109, the output end of regulator rectifier circuit 109
Connect the second input of the first power switching switch 105, the current output terminal and connection sampled signal of current sampling circuit 110
Output end connects the earth terminal and main control chip 1011 of regulator rectifier circuit 109, the electric current input of current sampling circuit 110 respectively
The output end of end connection device for power switching 111, the input of device for power switching 111 connects the second power switching switch 106
DC output end, device for power switching 111 controlled end connection main control chip 1011, the first power switching switch 105 it is defeated
Go out end connection rotating speed switching switch 103, the ac input end and two directions' inputing output end of the second power switching switch 106 connect respectively
Connect the negative output terminal of AC power AC and turn to switching switch 104；The input connection AC power AC of power switch 107 is just
Output end, the first of the connection series excited machine 300 of motor speed measuring circuit 1012 line 31 and second that tests the speed is tested the speed line 32, and motor is surveyed
Fast circuit 1012 is also connected with main control chip 1011, and rotating speed switching switch 103 and steering switching switch 1054 are all connected with host computer
200, and rotating speed switching switch 103 is also connected with the first stator line 301 and the 3rd stator line 303 of series excited machine 300, turns to switching
Switch 104 is also connected with the first brush wire 310, the second brush wire 320 and the second stator line 302 of series excited machine 300.
Filter circuit 108 is exported to regulator rectifier circuit 109 after treatment is filtered to above-mentioned positive half-wave alternating current, whole
The positive half-wave alternating current and minus half alternating current wave of AC power AC outputs that stream mu balanced circuit 109 pairs is processed after filtering carry out whole
Direct current to the first power switching switch 105 is exported after stream voltage stabilizing treatment, current sampling circuit 110 is to regulator rectifier circuit 109
Loop current (be from the second power switching switch 106 be back to regulator rectifier circuit 109 earth terminals electric current) carry out
Detect and feedback current sampled signal is to main control chip 1011, main control chip 1011 is according to above-mentioned motor speed signal and electric current
Sampled signal exports copped wave process signal, and device for power switching 111 is switched according to the copped wave process signal to the second power switching
The 106 loop direct currents for being exported feed back to regulator rectifier circuit 109 after carrying out copped wave treatment.
Due to exporting direct current by the first power switching switch 105, rotating speed switching switch from regulator rectifier circuit 109
103rd, series excited machine 300, steering switching switch 104 and the second power switching switch 106 return again to connecing for regulator rectifier circuit 109
Ground terminal, which forms a loop, so the loop direct current reality that the second power switching switch 106 described herein is exported
It is the above-mentioned direct current identical exported with regulator rectifier circuit 109 on border, device for power switching 111 is carried out to loop direct current
Direct current of the copped wave treatment actually namely to the output of regulator rectifier circuit 109 carries out copped wave treatment with to direct current realization electricity
Pressure modulation.
It is upper when series excited machine 300 is switched to high-speed cruising state by the control rotating speed switching of host computer 200 switch 103
The first power switching of the control switch 105 of machine 200 and the second power switching switch 106 by above-mentioned positive half-wave alternating current and are born respectively
Half alternating current wave is exported to rotating speed switching switch 103 and turns to switching switch 104.
It is upper when series excited machine 300 is switched to low-speed run state by the control rotating speed switching of host computer 200 switch 103
Machine 200 controls the direct current electricity output that the first power switching switch 105 exports regulator rectifier circuit 109 to rotating speed to switch switch
103, and control the second power switching switch 106 to stop exporting above-mentioned minus half alternating current wave to steering switching switch simultaneously
104。
For above-mentioned series excited machine control system 100, it needs to switch to high-speed cruising state in series excited machine 300
When, the positive half-wave that AC power AC is exported is exchanged respectively with the second power switching switch 106 by the first power switching switch 105
Electric and minus half alternating current wave is exported to rotating speed switching switch 103 and turns to switching switch 104, so that series excited machine 300 is in exchange
High-speed cruising is realized in the case of power supply, and then overcomes the brush that series excited machine occurs in direct current supply and high-speed cruising
The serious problem of partial wear, contributes to extension brush life and reduces noise；And need to switch to low speed to transport in series excited machine 300
During row state, by the first power switching switch 105 by the direct current electricity output after copped wave is processed to rotating speed switching switch 103,
And control the second power switching switch 106 to stop exporting minus half alternating current wave to switching switch 104 is turned to, so that series excitation simultaneously
Motor 300 realizes low cruise in the case of direct current supply such that it is able to effectively reduce series excited machine iron loss and copper loss,
Improve the temperature rise of the efficiency, the startability of raising series excited machine and reduction motor stator, rotor and brush of series excited machine
Meanwhile, further reduce the static magnetic field iron loss of series excited machine, and be conducive to extension brush life and reduce noise.
Wherein, for the efficiency of raising series excited machine 300, electric efficiency test and the simulation comparison shown in Fig. 9 be can refer to
Figure, for the existing motor control schemes shown in Fig. 1, it is solid in rotating speed that curve L1 and curve L2 in Fig. 9 are respectively series excited machine
It is set to testing efficiency change curve and simulation efficiency change curve under 600rpm (rev/min) and different torques；And above-mentioned
Under the control of series excited machine control system 100, testing efficiency change curve and simulation efficiency the change curve difference of series excited machine
It is curve L5 and curve L6 in Fig. 9.Compare with L1 and L2 respectively by by L5 and L6, in series excited machine control system
Under 100 control, the efficiency of series excited machine 300 improves about 15%~20% relative to prior art.
For reducing motor stator, rotor and the temperature rise of brush, for same series excited machine, in the institute of application drawing 1 respectively
The scheme that the scheme and the present embodiment Fig. 8 shown are provided, according to rotating speed be 710rpm, torque is 0.6N.m and steering is dextrorotation
Continuously resulting temperature rise test data is as shown in the table after operation 30 minutes to turn the test condition of CW：
As can be known from the above table, under the control of the series excited machine control system that the present embodiment Fig. 4 is provided, series excited machine is in low speed
Stator temperature rise during operation reduces about 30K relative to the stator temperature rise of Fig. 1 schemes, and rotor temperature rise reduces about 40K, in series excitation
The temperature of the left brush (as shown in Figure 6) of the terminal board side of motor reduces about 50 DEG C, in the non-terminal board side of series excited machine
The temperature of right brush (as shown in Figure 6) reduces about 60 DEG C.
In addition, when series excited machine 300 during low cruise when powering off, in order to by the winding in series excited machine 300
The electric current for being remained is discharged, and series excited machine control system 100 may also include diode D, as shown in Figure 10, diode D's
Anode and negative electrode connect respectively the second power switching switch 106 DC output end and the first power switching switch 105 second
Input.Due to the presence of diode D, the electric current that the winding in series excited machine 300 is remained can pass sequentially through steering switching and open
Close the 104, second power switching switch 106, diode D and the first power switching switchs the 105 electric current release loops for being formed and enters
Row release.
Specifically, Figure 11 (corresponding diagram 8) and Figure 12 (corresponding diagram 10) show the example of above-mentioned series excited machine control system
Circuit structure, details are as follows：
Power switch 107 is specially the first relay K1, the first relay K1 connection host computer 200, and the first relay
The movable contact and normally opened contact of K1 are respectively the input and output end of power switch 107.Wherein, the first relay K1 is upper
Under the control of machine 200 closure and from AC power AC introduce alternating current positive half-wave.
Motor speed measuring circuit 1012 is the conventional circuit detected to motor speed；Main control chip 1011 specifically can be with
It is the conventional IC chip comprising microprocessing unit and drive circuit.Wherein, motor speed measuring circuit 1012 is to series excitation electricity
Machine 300 carries out Rotating speed measring and feeds back motor speed signal to main control chip 1011.
The power supply of the connection of movable contact 3 first that rotating speed switching switch 103 is specially the second relay K2, the second relay K2 is cut
The output end of switch 105 is changed, first stationary contact 1 and the second stationary contact 2 of the second relay K2 connect series excited machine 300 respectively
First stator line 301 and the 3rd stator line 303.Wherein, the second relay K2 according to the control of host computer 200 to series excited machine
300 carry out low speed switching control high, when the movable contact 3 of the second relay K2 is connected with the first stationary contact 1, series excited machine 300
Into low-speed run state, and when the movable contact 3 of the second relay K2 is connected with the second stationary contact 2, series excited machine 300 enters
High-speed cruising state.
Turning to switching switch 104 includes the 3rd relay K3 and the 4th relay K4, the 3rd relay K3 and the 4th relay
Device K4 is connected with host computer 200, and the movable contact of the 3rd relay K3 connects the output end of the second power switching switch 106, the
First stationary contact 1 of three relay K3 and first stationary contact 1 of the 4th relay K4 are connected to the first brush of series excited machine 300 altogether
Line 310, second stationary contact 2 of the 3rd relay K3 and second stationary contact 2 of the 4th relay K4 are connected to series excited machine 300 altogether
Second brush wire 320, the movable contact 3 of the 4th relay K4 connects the second stator line 302 of series excited machine 300.
Wherein, the 3rd relay K3 and the 4th relay K4 under the control of host computer 200 to 300 turns of series excited machine
To switching control, when the movable contact 3 of the 3rd relay K3 connects the brush wire of series excited machine 300 by its first stationary contact 1
310, and the 4th relay K4 movable contact 3 by its second stationary contact 2 connect series excited machine 300 brush wire 320 when, series excitation
Motor 300 is to rotate forward；When the movable contact 3 of the 3rd relay K3 connects the electricity of series excited machine 300 by its second stationary contact 2
Brush line 320, and the 4th relay K4 movable contact 3 by its first stationary contact 1 connect series excited machine 300 brush wire 310 when,
Series excited machine 300 is to rotate backward.
Filter circuit 108 includes the first end connection power switch of the first electric capacity C1 and first resistor R1, the first electric capacity C1
107 output end (i.e. the normally opened contact of the first relay K1), second end of the first electric capacity C1 connects the first of first resistor R1
End, second end of first resistor R1 connects the negative output terminal of AC power AC.
Regulator rectifier circuit 109 includes：
Rectifier bridge BD, piezo-resistance TVR and electrochemical capacitor C；
The positive input terminal 1 and negative input end 2 of rectifier bridge BD are respectively the positive input terminal and negative input of regulator rectifier circuit 109
End, the output end 3 of rectifier bridge BD connects connecing altogether of being formed with the first end of the first end of piezo-resistance TVR and electrochemical capacitor C altogether
Point is the output end of regulator rectifier circuit 109, the ground terminal 4 of rectifier bridge BD and second end of piezo-resistance TVR and electrochemical capacitor C's
Second end connects the earth terminal that the common contact to be formed is regulator rectifier circuit 109 altogether.Wherein, rectifier bridge BD is used for after filtering
After minus half alternating current wave that positive half-wave alternating current and AC power AC after the filtering process of circuit 108 are exported carries out rectification treatment
Direct current is exported, and the direct current is exported to the 5th relay K5 after electrochemical capacitor C carries out voltage stabilizing treatment.
Current sampling circuit 110 includes：
Sampling resistor Rs, second resistance R2, the second electric capacity C2,3rd resistor R3, the 4th resistance R4, operational amplifier U,
Five resistance R5 and the 3rd electric capacity C3；
The first end of sampling resistor Rs and the second end are respectively current input terminal and the electric current output of current sampling circuit 110
End, the first end of the first end connection sampling resistor Rs of second resistance R2, second end of second resistance R2 is with the second electric capacity C2's
First end is connected to the first end of 3rd resistor R3, the second end ground connection of the second electric capacity C2, the second end connection of 3rd resistor R3 altogether
The in-phase input end of operational amplifier U, the first end ground connection of the 4th resistance R4, the second end and the 5th resistance R5 of the 4th resistance R4
First end be connected to the inverting input of operational amplifier U, second end of the 5th resistance R5 and the output end of operational amplifier U altogether
Common contact be the sampled signal output end of current sampling circuit 110, the positive power source terminal of operational amplifier U and the 3rd electric capacity C3's
First end is connected to dc source VCC altogether, and second end of the negative power end of operational amplifier U and the 3rd electric capacity C3 is grounded.
Device for power switching 111 can be specifically metal-oxide-semiconductor field effect transistor, IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor) or other possess the semiconductor devices of switching characteristic.As shown in figure 11, work(
Rate switching device 111 is metal-oxide-semiconductor field effect transistor, and the drain electrode of metal-oxide-semiconductor field effect transistor, source electrode and grid are respectively device for power switching
109 input, output end and controlled end.When device for power switching 111 is IGBT (not shown)s, the drain electrode of IGBT,
Source electrode and grid are respectively input, output end and the controlled end of device for power switching 111.
First power switching switch 105 is specially the 5th relay K5, first stationary contact 1, second of the 5th relay K5
Stationary contact 2 and movable contact 3 are respectively first input end, the second input and the output end of the first power switching switch 105.
Second power switching switch 106 is specially the 6th relay K6, first stationary contact 1, second of the 6th relay K6
DC output end, ac input end and the two directions' inputing that stationary contact 2 and movable contact 3 are respectively the second power switching switch 106 are defeated
Go out end.
Wherein, when host computer 200 controls the second relay K2 that series excited machine 300 is switched into high-speed cruising state, on
Position machine 200 controls first stationary contact 1 of the 5th relay K5 to be connected with movable contact 3, and controls the of the 6th relay K6 simultaneously
Two stationary contacts 2 are connected with movable contact 3.When host computer 200 controls the second relay K2 that series excited machine 300 is switched into low cruise
During state, host computer 200 controls second stationary contact 2 of the 5th relay K5 to be connected with movable contact 3, and controls the 6th relay simultaneously
First stationary contact 1 of device K6 is connected with movable contact 3.
For above-mentioned series excited machine control system 100, wherein being entered to the voltage on sampling resistor Rs by operational amplifier U
Row differential amplification is obtaining corresponding current sampling signal；Main control chip 1011 is with the current sampling signal and motor speed measuring circuit
1012 motor speed signals for being fed back are used as reference, and correspondingly output copped wave process signal control device for power switching 111
Duty cycle of switching so that the direct current that device for power switching 111 can be exported to regulator rectifier circuit 109 is carried out accordingly
Copped wave treatment to adjust the galvanic voltage, and export to the 5th relay K5, it is low such that it is able to reduce series excited machine 300
Speed runs on the static magnetic field iron loss under direct current supply.Therefore, by the 5th relay K5 and the 6th relay K6 in host computer
Power supply mode under 200 control to series excited machine 300 is switched over, and can enable the reality in Alternating Current Power Supply of series excited machine 300
Existing high-speed cruising, and realize low cruise in direct current supply.
In sum, in the series excited machine control system that first embodiment of the invention and second embodiment are provided,
Alternating Current Power Supply can be carried out to it when series excited machine is in high-speed cruising state, and low-speed run state is in series excited machine
When direct current supply is carried out to it, so as to overcome the brush partial wear that series excited machine occurs in direct current supply and high-speed cruising
Serious problem, contributes to extension brush life and reduces noise；And can effectively subtract in series excited machine low cruise
The iron loss and copper loss of small series excited machine, the efficiency for improving series excited machine, the startability for improving series excited machine and reduction motor
The temperature rise of stator, rotor and brush, and be conducive to extension brush life and reduce noise.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (16)
1. a kind of series excited machine control system, it is connected with host computer, and including alternating current output circuit, direct current electricity output electricity
Road, rotating speed switching switch and steering switching switch, under the control of the host computer, the alternating current output circuit is according to series excitation
The rotating speed of motor exports corresponding positive half-wave alternating current, and exports minus half alternating current wave simultaneously, the direct current output circuit pair
The positive half-wave alternating current and minus half alternating current wave export direct current, the rotating speed switching after carrying out AC-DC conversion treatment
Switch carries out low speed switching control high under the control of the host computer to the series excited machine, and the steering switching switch is in institute
State and steering switching control is carried out to the series excited machine under the control of host computer；It is characterized in that：
The series excited machine control system also includes the first power switching switch and the second power switching switch；
When described in the PC control rotating speed switching switch series excited machine is switched into high-speed cruising state when, it is described on
Position machine controls the first power switching switch and second power switching switch respectively by the positive half-wave alternating current and institute
State minus half alternating current wave and export to rotating speed switching switch and described steering and switch switch；
When described in the PC control rotating speed switching switch series excited machine is switched into low-speed run state when, it is described on
Position machine controls the first power switching switch that the direct current electricity output to the rotating speed is switched into switch, and controls simultaneously described
Second power switching switch stops exporting minus half alternating current wave to the steering switching switch.
2. the series excited machine control system as shown in claim 1, it is characterised in that the first power switching switch is the 5th
Relay, the first stationary contact of the 5th relay, the second stationary contact and movable contact are respectively first power switching and open
The first input end of pass, the second input and output end.
3. the series excited machine control system as shown in claim 1, it is characterised in that the second power switching switch is the 6th
Relay, the first stationary contact of the 6th relay, the second stationary contact and movable contact are respectively second power switching and open
The first input end of pass, the second input and output end.
4. a kind of series excited machine, it has drive end bearing bracket and rear end cap, it is characterised in that the series excited machine also includes that right such as will
The series excited machine control system described in 1 to 3 any one is sought, the series excited machine set-up of control system is in before the series excited machine
On end cap or rear end cap.
5. a kind of washing machine, including host computer, it is characterised in that the washing machine also includes series excitation as claimed in claim 4
Motor.
6. a kind of series excited machine control system, it is connected with host computer, and including power switch, motor speed measuring circuit, master control core
Piece, rotating speed switching switch and switching switch is turned to, the power switch is closed and from alternating current under the control of the host computer
Source introduces positive half-wave alternating current, and the motor speed measuring circuit carries out Rotating speed measring and feeds back motor speed signal extremely to series excited machine
The main control chip, the rotating speed switching switch carries out low speed switching high under the control of the host computer to the series excited machine
Control, the switching switch that turns to carries out steering switching control under the control of the host computer to the series excited machine；It is special
Levy and be：
The series excited machine control system also includes：Filter circuit, regulator rectifier circuit, current sampling circuit, power switch device
Part, the first power switching switch and the second power switching switch；
The filter circuit is exported to the regulator rectifier circuit after treatment is filtered to the positive half-wave alternating current, described whole
Stream mu balanced circuit carries out whole to minus half alternating current wave that the positive half-wave alternating current for processing after filtering and the AC power are exported
Direct current to first power switching is exported after stream voltage stabilizing treatment to switch, the current sampling circuit is to rectifying and voltage-stabilizing electricity
The loop current on road detect and feedback current sampled signal is to the main control chip, and the main control chip is according to the motor
Tach signal and current sampling signal output copped wave process signal, the device for power switching is processed according to the copped wave to be believed
Number second power switching is switched after exported loop direct current carries out copped wave treatment and to feed back to the rectifying and voltage-stabilizing electricity
Road；
When described in the PC control rotating speed switching switch series excited machine is switched into high-speed cruising state when, it is described on
Position machine controls the first power switching switch and second power switching switch respectively by the positive half-wave alternating current and institute
State minus half alternating current wave and export to rotating speed switching switch and described steering and switch switch；
When described in the PC control rotating speed switching switch series excited machine is switched into low-speed run state when, it is described on
Position machine controls the first power switching switch that the direct current electricity output to the rotating speed is switched into switch, and controls simultaneously described
Second power switching switch stops exporting minus half alternating current wave to the steering switching switch.
7. series excited machine control system as claimed in claim 6, it is characterised in that the series excited machine control system also includes
Diode, the anode and negative electrode of the diode connect the DC output end and described the of the second power switching switch respectively
Second input of one power switching switch.
8. series excited machine control system as claimed in claim 6, it is characterised in that the first power switching switch is the 5th
Relay, the first stationary contact of the 5th relay, the second stationary contact and movable contact are respectively first power switching and open
The first input end of pass, the second input and output end.
9. series excited machine control system as claimed in claim 6, it is characterised in that the second power switching switch is the 6th
Relay, the first stationary contact of the 6th relay, the second stationary contact and movable contact are respectively second power switching and open
The DC output end of pass, ac input end and two directions' inputing output end.
10. series excited machine control system as claimed in claim 6, it is characterised in that the filter circuit includes the first electric capacity
And first resistor, the output end of the first end connection power switch of first electric capacity, the second end of first electric capacity
The first end of the first resistor is connected, the second end of the first resistor connects the negative output terminal of the AC power.
11. series excited machine control systems as claimed in claim 6, it is characterised in that the regulator rectifier circuit includes：
Rectifier bridge, piezo-resistance and electrochemical capacitor；
The positive input terminal and negative input end of the rectifier bridge are respectively the positive input terminal and negative input end of the regulator rectifier circuit,
The output end of the rectifier bridge connects being total to of being formed with the first end of the piezo-resistance and the first end of the electrochemical capacitor altogether
Contact is the output end of the regulator rectifier circuit, second end of the ground terminal of the rectifier bridge with the piezo-resistance and the electricity
The second end for solving electric capacity connects the earth terminal that the common contact to be formed is the regulator rectifier circuit altogether.
12. series excited machine control systems as claimed in claim 6, it is characterised in that the current sampling circuit includes：
Sampling resistor, second resistance, the second electric capacity, 3rd resistor, the 4th resistance, operational amplifier, the 5th resistance and the 3rd
Electric capacity；
The first end of the sampling resistor and the second end are respectively current input terminal and the electric current output of the current sampling circuit
End, the first end of the second resistance connects the first end of the sampling resistor, the second end of the second resistance and described the
The first end of two electric capacity is connected to the first end of the 3rd resistor, the second end ground connection of second electric capacity, the 3rd electricity altogether
Second end of resistance connects the in-phase input end of the operational amplifier, the first end ground connection of the 4th resistance, the 4th electricity
Second end of resistance is connected to the inverting input of the operational amplifier, the 5th resistance with the first end of the 5th resistance altogether
The second end and the sampled signal output end that the common contact of the output end of the operational amplifier is the current sampling circuit, institute
The positive power source terminal and the first end of the 3rd electric capacity for stating operational amplifier are connected to dc source altogether, the operational amplifier it is negative
Second end of power end and the 3rd electric capacity is grounded.
13. series excited machine control systems as claimed in claim 6, it is characterised in that the device for power switching is MOS effect
Ying Guan, the drain electrode of the metal-oxide-semiconductor field effect transistor, source electrode and grid are respectively the input of the device for power switching, output end
And controlled end.
14. series excited machine control systems as claimed in claim 6, it is characterised in that when the device for power switching is IGBT,
The drain electrode of the IGBT, source electrode and grid are respectively input, output end and the controlled end of the device for power switching.
A kind of 15. series excited machines, it has drive end bearing bracket and rear end cap, it is characterised in that the series excited machine also includes such as right
It is required that the series excited machine control system described in 6 to 14 any one, the series excited machine set-up of control system is in the series excited machine
Drive end bearing bracket or rear end cap on.
A kind of 16. washing machines, including host computer, it is characterised in that the washing machine also includes string as claimed in claim 15
Swash motor.
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| CN109672391A (en) * | 2019-01-14 | 2019-04-23 | 深圳博英特科技有限公司 | A kind of series excited machine control system and method |
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| EP0054460A1 (en) * | 1980-12-12 | 1982-06-23 | Thomson-Brandt | Speed control means of an electrical motor of a washing machine |
| WO1990007227A1 (en) * | 1988-12-12 | 1990-06-28 | Hitachi, Ltd. | Speed controller for electric motor |
| CN201742367U (en) * | 2010-01-29 | 2011-02-09 | 江苏苏美达五金工具有限公司 | Speed regulating circuit of cleaning machine |
| CN202513854U (en) * | 2012-03-02 | 2012-10-31 | 成都掌握移动信息技术有限公司 | Mine coal electric drill electric controller based on transistor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0054460A1 (en) * | 1980-12-12 | 1982-06-23 | Thomson-Brandt | Speed control means of an electrical motor of a washing machine |
| WO1990007227A1 (en) * | 1988-12-12 | 1990-06-28 | Hitachi, Ltd. | Speed controller for electric motor |
| CN201742367U (en) * | 2010-01-29 | 2011-02-09 | 江苏苏美达五金工具有限公司 | Speed regulating circuit of cleaning machine |
| CN202513854U (en) * | 2012-03-02 | 2012-10-31 | 成都掌握移动信息技术有限公司 | Mine coal electric drill electric controller based on transistor |
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