CN205992015U - Counter electromotive force measuring device of motor - Google Patents
Counter electromotive force measuring device of motor Download PDFInfo
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- CN205992015U CN205992015U CN201620882020.0U CN201620882020U CN205992015U CN 205992015 U CN205992015 U CN 205992015U CN 201620882020 U CN201620882020 U CN 201620882020U CN 205992015 U CN205992015 U CN 205992015U
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- 238000005259 measurement Methods 0.000 claims abstract description 43
- 238000005070 sampling Methods 0.000 claims abstract description 32
- 230000005611 electricity Effects 0.000 claims description 9
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- 239000000523 sample Substances 0.000 description 33
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
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Abstract
The utility model discloses a counter electromotive force measuring device of motor relates to the motor field. The apparatus includes a sampling component and a waveform determining component; the sampling component is connected with the motor stator and is used for collecting voltage signals between any two phases of the motor stator, wherein when the rotating speed of a rotor of the motor reaches a set speed threshold value, the motor controller stops outputting driving pulse signals; the waveform determining component is electrically connected with the sampling component and used for acquiring the voltage signal acquired by the sampling component and determining the waveform of the voltage signal corresponding to the motor stator after the motor controller stops outputting the driving pulse signal so as to determine the value of the counter electromotive force according to the waveform corresponding to the counter electromotive force of the motor. The utility model discloses technical scheme has reached and has simplified current measuring method, improves measurement accuracy's effect.
Description
Technical field
This utility model embodiment is related to motor technology, the counter electromotive force measurement apparatus of more particularly, to a kind of motor.
Background technology
Permagnetic synchronous motor because having the series of advantages such as high efficiency, high torque (HT), high power density and good speed adjustment features,
Industry, traffic and household appliance technical field are used widely.
Counter electromotive force is an important parameter of the control of permagnetic synchronous motor.Measure the sky of permagnetic synchronous motor at this stage
Carry counter electromotive force and typically adopt additional prime mover drawing method or manually to methods such as rotor acceleration.For example, dragged using prime mover
Dynamic permagnetic synchronous motor, makes rotor reach rated speed, permanent-magnetic synchronous motor stator is opened a way, by oscilloscope measurement stator electricity
Pressure, records no-load back electromotive force of permanent magnet motor with this.Due to oscillographic input voltage limit it is desirable to the normal speed of rotor relatively
Low, but because there is damping, the decay of back emf waveform is very fast, the accuracy of impact counter electromotive force measurement.Meanwhile, former dynamic
When machine is installed with motor, special test equipment is needed to ensure accurate axiality and sufficiently small damping between rotor, even
Connect operation comparatively laborious.In addition, when measuring the counter electromotive force of motor of product (as compressor) of outsourcing, needing motor from this
Disassemble in product and just can measure, increased the complexity of counter electromotive force measurement.
Utility model content
This utility model provides a kind of counter electromotive force measurement apparatus of motor, to simplify existing metering system, improves and surveys
Accuracy of measurement.
In a first aspect, this utility model embodiment provides a kind of counter electromotive force measurement apparatus of motor, including：Sampling unit
Part and waveform determine part；
Described sample unit is connected with motor stator, for gather described motor stator arbitrarily biphase between voltage letter
Number, wherein, when the rotor speed of described motor reaches setting speed threshold value, electric machine controller stops output driving pulse letter
Number；
Described waveform determines that part is electrically connected with described sample unit, for obtaining the described electricity of described sample unit collection
Pressure signal, determines the ripple of the corresponding voltage signal of motor stator after described electric machine controller stopping output driving pulse signal
Shape, to determine the value of counter electromotive force according to the corresponding waveform of counter electromotive force of described motor.
Second aspect, this utility model embodiment additionally provides a kind of counter electromotive force measurement apparatus of motor, this device bag
Include：Mersure Controler, sample unit, disconnecting switch and waveform determine part；
Described sample unit is connected with motor stator, for gather described motor stator arbitrarily biphase between voltage letter
Number, wherein, described motor runs under the control of the drive pulse signal that electric machine controller exports；
Described disconnecting switch is connected between described electric machine controller and described motor, for receiving switch OFF letter
Number when, the circuit disconnecting between described electric machine controller and motor is connected；
Described waveform determines that part is electrically connected with described sample unit, for obtaining the described electricity of described sample unit collection
Pressure signal, determines the waveform of the voltage signal after described electric machine controller stopping output driving pulse signal；
With described electric machine controller, described disconnecting switch and described waveform, described Mersure Controler determines that part is electrically connected respectively
Connect, for obtaining the rotor speed of motor from described electric machine controller, when rotor speed exceedes setting speed threshold value, output is opened
Close cut-off signals to described disconnecting switch；
And, obtain the waveform that described waveform determines the voltage signal of part, determine the electricity of the corresponding waveform of counter electromotive force
It is pressed with valid value and frequency, calculate the value of counter electromotive force according to described voltage effective value and frequency.
This utility model is reached by the rotating speed of electric machine controller motor rotor and stops during setting speed threshold value driving,
And by gather stator in arbitrarily biphase between the corresponding voltage signal of counter electromotive force, then, component retrieval is determined by waveform
This voltage signal, determines waveform corresponding with this voltage signal, the i.e. waveform of counter electromotive force, the waveform according to counter electromotive force determines
The value of counter electromotive force.The measurement operation that technical solutions of the utility model solve current counter electromotive force measuring method is comparatively laborious, ripple
Shape decay comparatively fast leads to the not high problem of measurement accuracy, due to being provided with sample unit, need not consider that waveform determines part
Measurement range, can measure at a high speed, increase certainty of measurement；Meanwhile, directly driven using electric machine controller, need not be from encapsulation
In product, dismounting obtains motor and additional prime mover drags, and reduces measurement cost, has reached the existing metering system of simplification, improves
The effect of certainty of measurement.
Brief description
Fig. 1 is the structural representation of the counter electromotive force measurement apparatus of the motor in this utility model embodiment one；
Fig. 2 is the counter electromotive force measurement apparatus measurement anti-electricity that the utilization the present embodiment in this utility model embodiment one provides
The method flow diagram of kinetic potential；
Fig. 3 is the structural representation in the counter electromotive force measurement apparatus of the motor in this utility model embodiment two；
Fig. 4 is the counter electromotive force measurement apparatus measurement anti-electricity that the utilization the present embodiment in this utility model embodiment two provides
The method flow diagram of kinetic potential.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining this utility model, rather than to restriction of the present utility model.Further need exist for
Bright, for the ease of description, in accompanying drawing, illustrate only the part related to this utility model rather than entire infrastructure.
Embodiment one
The structural representation of the counter electromotive force measurement apparatus of the motor that Fig. 1 provides for this utility model embodiment one, this reality
Apply example to be applicable to provide driving by the controller of electric drilling match, thus anti-electronic by analyzing the waveform determination of counter electromotive force
The situation of the value of gesture.As shown in figure 1, this counter electromotive force measurement apparatus specifically includes：Sample unit 110 and waveform determine part
120.
Wherein, this sample unit 110 is connected with motor stator, for gather described motor stator arbitrarily biphase between
Voltage signal, wherein, when the rotor speed of described motor 150 reaches setting speed threshold value, electric machine controller 140 stops output
Drive pulse signal.Electric machine controller 140 is the supporting control device of motor 150, for example, can be converter or square wave control
The controllers such as device.As shown in figure 1, electric machine controller 140 connects alternating current power supply (according to controller specified input type selecting), outfan
The corresponding contact (in figure U phase, V phase and W phase) connecting each phase of motor stator winding, with output driving pulse signal to stator around
Group, and then drive rotor to rotate, and rotor speed may be displayed on electric machine controller 140.Tester observes rotor
When rotating speed reaches setting speed threshold value, cut off the input of alternating current power supply or close electric machine controller 140, so that electric machine controller
140 stop output driving pulse signal to motor 150.Due to there is electromagnetic induction, motor stator winding exists and input
Voltage signal counter electromotive force in opposite direction.
On the basis of technique scheme, disconnecting switch 130 of connecting between electric machine controller 140 and motor 150,
When receiving switch OFF signal, disconnect described electric machine controller 140 and be connected with the circuit between motor 150, realize tester
When member observes that rotor speed reaches setting speed threshold value, electric machine controller 140 is made to stop by way of disconnecting disconnecting switch 130
Only output driving pulse signal.Disconnecting switch 130 is set between electric machine controller 140 and motor 150, has isolated interference letter
Number, it is to avoid the impact of the back emf waveform to motor 150 for the electric capacity electric discharge in electric machine controller 140, improve certainty of measurement.
Exemplary, as shown in figure 1, this sample unit 110 includes sampling resistor 112 and at least two current limliting divider resistances
111, described current limliting divider resistance 111 is connected with the U phase phase resistance of stator and W phase phase resistance respectively, described current limliting divider resistance
111 and sampling resistor 112 connect.Wherein, sampling resistor 112 is different with the resistance of current limliting divider resistance 111.
On the basis of technique scheme, described current limliting divider resistance 111 and/or described sampling resistor 112 are variable
Rheostat, for adjusting the resistance ratio of current limliting divider resistance 111 and sampling resistor 112；Or, described current limliting divider resistance
111 and/or described sampling resistor 112 two ends be parallel with set resistance resistance.
Exemplary, this current limliting divider resistance 111 is the different variable rheostat of resistance with sampling resistor 112, by adjusting
Whole variable rheostatic resistance, realizes the resistance ratio of adjustment current limliting divider resistance 111 and sampling resistor 112, thus so that ripple
Shape determines that the voltage range measured by part 120 (such as oscillograph) is optimum, disturbs minimum simultaneously.
This waveform determines that part 120 is electrically connected with described sample unit 110, gathers for obtaining described sample unit 110
Described voltage signal, determine described electric machine controller 140 stop output driving pulse signal after the corresponding electricity of motor stator
The waveform of pressure signal, to determine the value of counter electromotive force according to the corresponding waveform of counter electromotive force of described motor 150.
On the basis of technique scheme, this waveform determines that part 120 can be oscillograph, described oscillograph and sampling
Resistance 112 is in parallel, for measuring the voltage signal of sampling resistor 112, and shows described voltage signal in the form of waveform.
Exemplary, the voltage probe on oscillograph connects the contact at sampling resistor 112 two ends, to detect sampling resistor 112
On voltage signal, and voltage waveform is shown on oscilloscope display screen.Before detectable voltage signals, can first debug oscillography
The time delay of device and sampling bandwidth, catch the unloaded waveform of motor 150 in order to oscillograph.
Fig. 2 shows and utilizes the counter electromotive force measurement apparatus measurement that the present embodiment provides anti-in this utility model embodiment one
The method flow diagram of electromotive force.As shown in Fig. 2 the method specifically includes following steps：
Step 210, sample unit gather motor stator arbitrarily biphase between voltage signal.
Wherein, the sampling resistor in sample unit be connected on motor stator arbitrarily biphase between, stop in electric machine controller
Only after output driving pulse signal, because the counter electromotive force that electromagnetic induction effect produces is in leading position in stator winding, suppression
Rotor processed rotates up to rotor to be stopped.
After electric machine controller stops to motor output driving pulse signal, the induced potential in stator winding corresponds to electricity
The counter electromotive force of machine, obtains counter electromotive force by sampling resistor.In order to prevent the corresponding counter electromotive force of higher rotating speed from exceeding ripple
Shape determines the measurement range of part, a current limliting divider resistance of connecting in each phase of stator, by adjusting current limliting divider resistance and adopting
The resistance ratio of sample resistance, realizes waveform and determines that part measurement voltage range is optimum, and disturb minimum.
Can be specifically to connect electric machine controller, chopper, motor, sample unit according to the structural representation shown in Fig. 1
Determine part with waveform.Wherein, waveform determines that part is oscillograph.The output that oscillographic voltage probe connects sample unit is touched
Point.After carefully connecting the wire, open oscillograph.Connect alternating current power supply, make motor operation (logical in the rotating speed setting by electric machine controller
Can be often rated speed).Now, debug oscillographic time delay and sampling width, make caught unloaded waveform optimal
(amplitude and the constant sine wave of frequency can be observed on oscillograph).Hereafter, cut-off breaker makes controller stop
Output driving pulse signal is to motor.
Step 220, waveform determine the described voltage signal of sample unit collection described in component retrieval, determine described motor control
The waveform of the corresponding voltage signal of motor stator after device stopping output driving pulse signal processed.
Wherein, waveform determines that part can be oscillograph, by oscillograph recording no-load back electromotive force waveform, with according to anti-
EMF waveform determines the value of counter electromotive force.
Exemplary, virtual value and the frequency of voltage is determined according to the waveform of counter electromotive force.Wherein, the virtual value root of voltage
Peak valley voltage difference according to back emf waveform in oscillograph determines, frequency is the inverse in cycle.Can be calculated according to frequency
Rotor speed, so, the value of counter electromotive force is the result divided by rotor speed for the voltage effective value.
Exemplary, the non-sinusoidal counter-electromotive-force of motor or the value of sinusoidal counter electromotive force can be calculated using aforesaid way.
The technical scheme of the present embodiment, when reaching setting speed threshold value by the rotating speed of electric machine controller motor rotor
Stop drive, and by gather stator in arbitrarily biphase between the corresponding voltage signal of counter electromotive force, then, determined by waveform
This voltage signal of component retrieval, determines waveform corresponding with this voltage signal, i.e. the waveform of counter electromotive force, according to counter electromotive force
Waveform determines the value of counter electromotive force.The measurement operation that technical solutions of the utility model solve current counter electromotive force measuring method compares
Loaded down with trivial details, waveform attenuating comparatively fast leads to the not high problem of measurement accuracy, due to being provided with sample unit, need not consider that waveform determines
The measurement range of part, can measure at a high speed, increase certainty of measurement；Meanwhile, directly driven using electric machine controller, need not be from
In the product of encapsulation, dismounting obtains motor and additional prime mover drags, and reduces measurement cost, has reached the existing measurement side of simplification
Formula, improves the effect of certainty of measurement.
Embodiment two
Fig. 3 is the structural representation in the counter electromotive force measurement apparatus of the motor in this utility model embodiment two.This reality
Apply example and be applicable to automatic control motor controller motor, the waveform gathering and analyzing counter electromotive force determines counter electromotive force
The situation of value.As shown in figure 1, this counter electromotive force measurement apparatus specifically includes：Mersure Controler 310, sample unit 350, isolation
Switch 330 and waveform determine part 360.
Described sample unit 350 is connected with motor stator, for gather described motor stator arbitrarily biphase between electricity
Pressure signal, wherein, described motor 340 runs under the control of the drive pulse signal that electric machine controller 320 exports, and makes motor
340 reach stable setting speed threshold value (can be rated speed).Sample unit 350 includes sampling resistor and at least two limits
Flow point piezoresistance, described current limliting divider resistance is connected from stator different phase resistance respectively, described current limliting divider resistance and adopting
Sample resistant series.Adjustable to the phase resistance of stator and resistance current limliting divider resistance is connected, and current limliting divider resistance can with resistance
The sampling resistor series connection becoming, can adjust by adjusting the resistance ratio of current limliting divider resistance and sampling resistor according to voltage divider principle
The voltage of whole sampling resistor output.
Described disconnecting switch 330 is connected between described electric machine controller 320 and described motor 340, for receiving
During switch OFF signal, disconnect described electric machine controller 320 and be connected with the circuit between motor 340.Wherein, disconnecting switch 330
It can be the device that chopper, photoelectrical coupler etc. have isolation features.Disconnecting switch 330 receives cut-off signals, according to shutoff
Signal disconnects the connection between electric machine controller 320 and motor 340.Exemplary, cut-off signals can be Mersure Controler 310
Export to the shutoff instruction of disconnecting switch 330, or the shutoff request of user input etc..
Described waveform determines that part 360 is electrically connected with described sample unit 350, adopts for obtaining described sample unit 350
The described voltage signal of collection, determines the waveform of the voltage signal after described electric machine controller 320 stopping output driving pulse signal.
Exemplary, waveform determines that part 360 obtains the voltage signal that sample unit 350 is gathered, and determines that this voltage signal is corresponding
Voltage waveform.Waveform due to back emf waveform and the drive pulse signal of electric machine controller 320 output constitutes reverse pass
System.Stop the moment of output driving pulse signal in electric machine controller 320, flex point is occurred on waveform.Using this point as anti-
The waveform starting point of electromotive force, till rotor stops operating, determines the waveform of voltage signal during this, as counter electromotive force
Corresponding waveform.
Described Mersure Controler 310 is true with described electric machine controller 320, described disconnecting switch 330 and described waveform respectively
Determine part 360 to electrically connect, for obtaining the rotor speed of motor 340 from described electric machine controller 320, exceed in rotor speed and set
When determining rotary speed threshold value, output switch cut-off signals to described disconnecting switch 330.Mersure Controler 310 is detecting turning of electronics
After rotor speed reaches threshold speed and the stable time span setting of setting, send cut-off signals to disconnecting switch 330.
And, obtain the waveform that described waveform determines the voltage signal of part 360, determine the corresponding waveform of counter electromotive force
Voltage effective value and frequency, calculate the value of counter electromotive force according to described voltage effective value and frequency.Exemplary, according to corresponding to
The waveform of counter electromotive force determines virtual value and the frequency of voltage.The rotating speed of rotor can be calculated according to frequency, so, anti-electronic
The value of gesture is the result divided by rotor speed for the virtual value of voltage.
Fig. 4 shows and utilizes the counter electromotive force measurement apparatus measurement that the present embodiment provides anti-in this utility model embodiment two
The method flow diagram of electromotive force.As shown in figure 4, the method specifically includes following steps：
Step 410, sample unit gather described motor stator arbitrarily biphase between voltage signal.
Wherein, described motor runs under the control of the drive pulse signal that electric machine controller exports.The knot of sample unit
Structure and function are same as the previously described embodiments, and here is omitted.
Step 420, disconnecting switch, when receiving switch OFF signal, disconnect between described electric machine controller and motor
Circuit connects.
Disconnecting switch is electrically connected with Mersure Controler, and in the shutoff instruction receiving Mersure Controler transmission, execution should
Turn off instruction, to disconnect the connection of electric machine controller and motor, wherein motor can be permagnetic synchronous motor.Can substitute
It is that disconnecting switch can also be disconnected electric machine controller and be connected with the circuit of motor under the control turning off request of user input.
Step 430, waveform determine the described voltage signal of sample unit collection described in component retrieval, determine described motor control
The waveform of the voltage signal after device stopping output driving pulse signal processed.
Waveform determines the voltage signal that component retrieval sample unit is gathered, and stops output driving pulse in electric machine controller
The moment of signal, using the flex point that voltage reversal is occurred on waveform as the waveform starting point of counter electromotive force, rotor is stopped operating
Point, as waveform terminal, determines the waveform of voltage signal during this, the as corresponding waveform of counter electromotive force.
Step 440, Mersure Controler obtain the rotor speed of motor from described electric machine controller, exceed in rotor speed and set
When determining rotary speed threshold value, output switch cut-off signals to described disconnecting switch.
Electric machine controller determines the rotor speed of current motor according to current output voltage, in the request of Mersure Controler
Under, electric machine controller sends rotor speed to Mersure Controler.Acquired rotor speed is turned by Mersure Controler with setting
Fast threshold value is compared, and when the rotor speed obtaining exceedes setting speed threshold value, output cut-off signals to disconnecting switch, to control
Disconnecting switch processed disconnects.
Step 450, the described waveform of acquisition determine the waveform of the voltage signal of part, determine the corresponding waveform of counter electromotive force
Voltage effective value and frequency, calculate the value of counter electromotive force according to described voltage effective value and frequency.
The moment disconnecting in disconnecting switch, produce counter electromotive force in the stator windings, this counter electromotive force hinders turning of rotor
Dynamic, and gradually decay in the presence of damping.The waveform recording of this counter electromotive force determines in part in waveform, Mersure Controler from
Waveform determines the waveform obtaining this counter electromotive force in part, determines its corresponding voltage effective value and frequency.Permissible according to frequency
Calculate the rotating speed of rotor, so, the value of counter electromotive force is the result divided by rotor speed for the virtual value of voltage.
Exemplary, the non-sinusoidal counter-electromotive-force of motor or the value of sinusoidal counter electromotive force can be calculated using aforesaid way.
The technical scheme of the present embodiment, drives electricity by Mersure Controler and disconnecting switch automatic control motor controller
Machine, and the stator voltage that waveform determines part is obtained by Mersure Controler, determine that the voltage of the corresponding waveform of counter electromotive force has
Valid value and frequency, calculate the value of counter electromotive force according to described voltage effective value and frequency.The technical scheme of the present embodiment is removed can
Reach outside the effect of above-described embodiment, realize automatically calculating the function of counter electromotive force due to employing Mersure Controler, reduce
The error introducing because of artificial operation, has reached the existing metering system of simplification, improves the effect of certainty of measurement.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, this utility model is not limited to specific embodiment described here, can carry out various bright for a person skilled in the art
Aobvious change, readjust and substitute without departing from protection domain of the present utility model.Therefore although passing through above example
This utility model is described in further detail, but this utility model is not limited only to above example, without departing from
In the case of this utility model design, other Equivalent embodiments more can also be included, and scope of the present utility model is by appended
Right determine.
Claims (7)
1. a kind of counter electromotive force measurement apparatus of motor are it is characterised in that include：Sample unit and waveform determine part；
Described sample unit is connected with motor stator, for gather described motor stator arbitrarily biphase between voltage signal,
Wherein, when the rotor speed in described motor reaches setting speed threshold value, electric machine controller stops output driving pulse signal；
Described waveform determines that part is electrically connected with described sample unit, for obtaining the described voltage letter of described sample unit collection
Number, determine the waveform of the corresponding voltage signal of motor stator after described electric machine controller stopping output driving pulse signal, with
The value of counter electromotive force is determined according to the corresponding waveform of counter electromotive force of described motor.
2. device according to claim 1 is it is characterised in that also include disconnecting switch；Described disconnecting switch is connected on institute
State between electric machine controller and described motor, for when receiving switch OFF signal, disconnecting described electric machine controller and electricity
Circuit between machine connects.
3. device according to claim 1 is it is characterised in that described sample unit includes sampling resistor and at least two limits
Flow point piezoresistance, described current limliting divider resistance is connected from stator different phase resistance respectively, described current limliting divider resistance and adopting
Sample resistant series.
4. device according to claim 3 is it is characterised in that described current limliting divider resistance and/or described sampling resistor are
Variable rheostat, for adjusting the resistance ratio of current limliting divider resistance and sampling resistor；
Or, the two ends of described current limliting divider resistance and/or described sampling resistor are parallel with the resistance setting resistance.
5. device according to claim 3 is it is characterised in that described waveform determines that part is oscillograph, described oscillograph
In parallel with sampling resistor, for measuring the voltage signal of sampling resistor, and show described voltage signal in the form of waveform.
6. a kind of counter electromotive force measurement apparatus of motor are it is characterised in that include：Mersure Controler, sample unit, disconnecting switch
Determine part with waveform；
Described sample unit is connected with motor stator, for gather described motor stator arbitrarily biphase between voltage signal,
Wherein, described motor runs under the control of the drive pulse signal that electric machine controller exports；
Described disconnecting switch is connected between described electric machine controller and described motor, for receiving switch OFF signal
When, the circuit disconnecting between described electric machine controller and motor is connected；
Described waveform determines that part is electrically connected with described sample unit, for obtaining the described voltage letter of described sample unit collection
Number, determine the waveform of the voltage signal after described electric machine controller stopping output driving pulse signal；
With described electric machine controller, described disconnecting switch and described waveform, described Mersure Controler determines that part electrically connects respectively,
For obtaining the rotor speed of motor, when rotor speed exceedes setting speed threshold value, output switch from described electric machine controller
Cut-off signals are to described disconnecting switch；
And, obtain the waveform that described waveform determines the voltage signal of part, determine that the voltage of the corresponding waveform of counter electromotive force has
Valid value and frequency, calculate the value of counter electromotive force according to described voltage effective value and frequency.
7. device according to claim 6 is it is characterised in that described sample unit includes sampling resistor and at least two limits
Flow point piezoresistance, described current limliting divider resistance is connected from stator different phase resistance respectively, described current limliting divider resistance and adopting
Sample resistant series.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620882020.0U CN205992015U (en) | 2016-08-15 | 2016-08-15 | Counter electromotive force measuring device of motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620882020.0U CN205992015U (en) | 2016-08-15 | 2016-08-15 | Counter electromotive force measuring device of motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291058A (en) * | 2016-08-15 | 2017-01-04 | 珠海凌达压缩机有限公司 | Counter electromotive force measuring device and method of motor |
| CN107015046A (en) * | 2017-03-23 | 2017-08-04 | 歌尔股份有限公司 | A kind of test device and method of testing of brushless electric machine counter electromotive force |
-
2016
- 2016-08-15 CN CN201620882020.0U patent/CN205992015U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291058A (en) * | 2016-08-15 | 2017-01-04 | 珠海凌达压缩机有限公司 | Counter electromotive force measuring device and method of motor |
| CN107015046A (en) * | 2017-03-23 | 2017-08-04 | 歌尔股份有限公司 | A kind of test device and method of testing of brushless electric machine counter electromotive force |
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