CN109088577A - Control device of electric motor - Google Patents
Control device of electric motor Download PDFInfo
- Publication number
- CN109088577A CN109088577A CN201810586877.1A CN201810586877A CN109088577A CN 109088577 A CN109088577 A CN 109088577A CN 201810586877 A CN201810586877 A CN 201810586877A CN 109088577 A CN109088577 A CN 109088577A
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- Prior art keywords
- phase
- current
- converter
- control device
- electric motor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
- Rectifiers (AREA)
Abstract
The present invention provides control device of electric motor, even if to the controller of power supply regenerative when power supply regenerative, system will not stop at once, its result, even if being generated in three phase mains uneven, also motor can be made to remain in operation, the control device of electric motor includes converter, and three-phase alternating-current supply is converted to direct current；Inverter is connect with the converter and motor, and drives the motor；And control circuit, the control of the converter is carried out, the control circuit includes maximum phase current test section, detects the maximum value of phase current；And threshold value comparison portion, the maximum value for the phase current that will test is compared with threshold value, when when detecting power supply regenerative by the threshold value comparison portion, the maximum value of phase current becomes current limit threshold, the converter is controlled in a manner of making the voltage between phases of two-phase of electric current flowing become zero.
Description
Technical field
The present invention relates to a kind of control device of electric motor.
Background technique
Control device of electric motor is for example made of converter and inverter.
When carrying out the power running of motor, AC power is converted into direct current power using converter, and utilize inverse
Direct current power is converted into AC power and carrys out drive motor by change device.
When carrying out the regeneration operating of motor, the AC power that motor generates electricity is converted into direct current using inverter
Power, and using converter direct current power is converted into AC power and to power supply regenerative.
For example, the control mode as above-mentioned converter has such as under type: in power supply phase in the case where three phase mains
Every 120 ° of sections of position switch transistor and return to power supply.
Fig. 4 is the circuit diagram for indicating a kind of structural example of above-mentioned control device of electric motor.Included in control device of electric motor
In electromotor control circuit X include: AC reactor 115, the converter comprising three-phase bridge circuit, phase detecting circuit 127
With grid signal preparing department 133.For example including six converter transistors in parallel and rectification in above-mentioned three-phase bridge circuit
With the group (107a-1~107c-2) of diode.The node of above-mentioned each group by AC reactor 115 respectively with three-phase alternating-current supply
105 connections.The phase of the detection three-phase alternating-current supply of phase detecting circuit 127.The grid of the production transistor of grid signal preparing department 133
Pole signal.
When carrying out the power running of motor 103, the grid of transistor 107a-1-1 is disconnected, transistor 107a-1-1 packet
It is contained in the parallel circuit 107a-1 of transistor possessed by converter 107 and diode.In addition, from three-phase alternating-current supply 105
Three phase full wave rectification is carried out by the diode 107a-1-2 in parallel with transistor 107a-1-1.It is provided as a result, to inverter 111
Electric power.
When carrying out the regeneration operating of motor 103, the phase based on the three-phase alternating-current supply detected by phase detecting circuit 127
Position, as shown in figure 5, the gate turn-on of transistor 107a-1-1.There is electric current to flow through in two phases as a result, direct current power returns
Power supply.In the section of transistor 107a-1-1 conducting, in the phase of upside, the supply voltage of each phase is more electric than the power supply of other phases
High 120 ° of section is pressed, and in the phase of downside, the supply voltage of each phase is 120 ° of area lower than the supply voltage of other phases
Between.
Japanese Patent Laid-Open Publication flat No. 10-239360 discloses a kind of control for preventing this converter 107
The example of overcurrent.
The overcurrent detection electricity with following characteristics is described in Japanese Patent Laid-Open Publication flat No. 10-239360
Road.In above-mentioned overcurrent sensing circuit, the converter for carrying out power supply regenerative control includes: energization direction detection device, detection
The energization direction of the input current of converter；And current characteristics comparison unit, by by the electric current of the input current of converter
Characteristic is compared with the fiducial value for overcurrent detection, carries out overcurrent detection.Based on being examined by energization direction detection device
The energization direction of the electric current of survey changes the fiducial value of current characteristics comparison unit.Also, by change the fiducial value, using with
The corresponding fiducial value in energization direction carrys out detection of excessive current.
In addition, describing the power supply with following characteristics again in Japanese Patent Laid-Open Publication 2009-201333
Raw converter.Above-mentioned power regenerative converter includes: switching circuit, is switched to the dump power generated in threephase load side
And it is regenerated to three-phase power supply system；Each phase current between three-phase power supply system and switching circuit is flowed through in current detector, detection
Size and Orientation；And control unit.When the current value of current detector detection is more than specified value, control unit is electric to switch
The driving circuit on road exports instruction, makes to constitute in the multiple switch element of switching circuit, from what is detected corresponding to current detector
The switch element of the small phase of current value starts in each phase current, sets gradually the defined time difference, turns off movement.
But in flat No. 10-239360 circuit of Japanese Patent Laid-Open Publication, it is if detecting overcurrent
System stops.In flat No. 10-239360 method of this Japanese Patent Laid-Open Publication, the system if detecting overcurrent
Stop.Thus, for example, when generating uneven in three phase mains, since the electric current of specific phase is excessive, so system moment sometimes
Stop.System stops making mechanical running rate decline.It is therefore preferable that being reduced as far as the frequency of system stopping.
But in flat No. 10-239360 method of Japanese Patent Laid-Open Publication, when overcurrent, cannot continue system
Operating.
In addition, the end of inhibition buffer condenser can be passed through in Japanese Patent Laid-Open Publication 2009-201333
Sub- voltage rises to reduce the capacity of buffer condenser, thus realize switching circuit protection when abnormal overcurrent occurs, it should
Buffer condenser inhibits the surge voltage comprising transistor in the converter.Therefore, monitoring is from switching circuit to three-phase alternating current
The current value of source side flowing.Also, when the abnormal overcurrent flowing for having level of protection or more, substitution makes to constitute switching circuit
Whole switch elements turn off movement simultaneously, and opened from the switch element of the phase small corresponding to current value in each phase current
Begin, sets gradually the defined time difference, it is made to turn off movement.Thus, it is possible to reduce the capacity of buffer condenser.But
Same as flat No. 10-239360 method of Japanese Patent Laid-Open Publication, when overcurrent, cannot continue the operating of system.
Flat No. 10-239360 of Japanese Patent Laid-Open Publication and Japanese Patent Laid-Open Publication 2009- as a result,
In the control method of the converter of No. 201333 control device of electric motor, system is stopped if overcurrent protection starting when regeneration
Only.It is thus impossible to continue the operating of system.
Summary of the invention
The present invention is for improving this problem.The purpose of the present invention is to provide a kind of control device of electric motor, even if electric
To the controller of power supply regenerative when source regenerates, system will not stop at once, and with generated not in three phase mains
It balances unrelated, motor can be made to remain in operation.
It is further an object that providing a kind of control device of electric motor that can reduce power supply noise.
A viewpoint according to the invention, provides a kind of control device of electric motor, includes converter, by three-phase alternating current
Power supply is converted to direct current；Inverter is connect with the converter and motor, and drives the motor；And control electricity
Road carries out the control of the converter, and the control circuit includes maximum phase current test section, detects the maximum of phase current
Value；And threshold value comparison portion, the maximum value for the phase current that will test are compared with threshold value, are detected when by the threshold value comparison portion
When the maximum value of phase current becomes current limit threshold when to power supply regenerative, so that the voltage between phases of the two-phase of electric current flowing becomes
Zero mode controls the converter.
According to above-mentioned control device of electric motor, when power supply regenerative, the maximum value of phase current reaches current limit threshold,
The switch element of the only phase in two-phase by making conducting disconnects to limit electric current, meanwhile, it can use regeneration resistance absorption
It cannot be to the regenerated electric power of power supply regenerative.
In addition, according to above-mentioned control device of electric motor, even if being to the controller of power supply regenerative when power supply regenerative
System will not stop at once.In addition, can also motor be made to remain in operation even if generating imbalance in three phase mains.Meanwhile
Power supply noise can be reduced.
Moreover it is preferred that the outlet side in the converter also has regeneration resistance, examined when by the threshold value comparison portion
When the maximum value of phase current becomes current limit threshold when measuring power supply regenerative, the control circuit leads the regeneration resistance
It is logical.
Moreover it is preferred that the converter includes three-phase bridge circuit, the three-phase bridge circuit includes six switches
Element and diode, the control circuit has the switch element selector of any one selected in the switch element, right
The converter is controlled, and makes to be disconnected by the switch element that the switch element selector selects.
Moreover it is preferred that the control circuit also includes the phase-detection electricity for detecting the three-phase alternating-current supply phase
Road, current limit control unit, power regenerating judging part and the production switch element grid signal grid signal production
Portion.
The control circuit can control the converter, when making regeneration operating in the phase of three-phase alternating-current supply
The switching elements conductive of the phase of the phase and minimum voltage of maximum voltage.
According to the present invention, in the movement of motor, even if being to the controller of power supply regenerative when power supply regenerative
System will not stop at once.As a result, can also motor be made to remain in operation even if generating imbalance in three phase mains.This
Outside, power supply noise can be reduced.
Detailed description of the invention
Fig. 1 is the circuit diagram for indicating a kind of structural example of control device of electric motor of one embodiment of the present invention.
Fig. 2 is the figure for indicating the circuit operation example of converter.
Fig. 3 is the figure for indicating that the time of associated voltage is interdependent, is the figure for indicating signal waveform.
Fig. 4 is the circuit diagram for indicating a kind of structural example of common control device of electric motor.
Fig. 5 is the figure for indicating the action waveforms example of circuit shown in Fig. 4.
Specific embodiment
In the following detailed description, for purposes of illustration, in order to provide to the thorough of disclosed embodiment
Understand, proposes many concrete details.It may be evident, however, that one or more can be implemented under the premise of these details
More embodiments.In other cases, it charts to simplify, it is schematically shown that well known construction and device.
In the following, the control device of electric motor of one embodiment of the present invention is described in detail referring to attached drawing.
Fig. 1 is the circuit diagram for indicating a kind of structural example of control device of electric motor of present embodiment.As shown in Figure 1, this
The control device of electric motor 1 of embodiment for example includes the AC reactor 15 connecting with three-phase alternating-current supply 5 and AC reactor
The converter 7 of 15 output connection is driven with the regeneration resistance 17 of the output connection of converter 7, to regenerating resistance 17
Transistor (switch elements such as semiconductor switch) 21, smoothing capacity device 23, inverter 11 and aftermentioned control system circuit.It utilizes
The output of inverter 11 carrys out drive motor 3.Converter 7 is for example by the three-phase bridge circuit comprising six transistors and diode
It constitutes.
The control unit of converter 7 includes the phase detecting circuit 27 of detection three-phase alternating-current supply phase, current limit control
Portion 25, power regenerating judging part 31 and make transistor 21 grid signal grid signal preparing department 33.
Power regenerating judging part 31 judges electricity such as using the direction of the direct current portion voltage of converter 7 or DC current
The operating condition of motivation.In addition, the grid for constituting the transistor of converter disconnects when power running.It is logical from three-phase alternating-current supply 5
The diode 7a-1-2 etc. in parallel with transistor 7a-1-1 etc. is crossed, three phase full wave rectification is carried out.Electricity is provided to inverter 11 as a result,
Power.When regeneration operating, based on the phase of the three-phase alternating-current supply detected by phase detecting circuit 27, as shown in figure 5, voltage is most
The upper arm transistor and voltage of big phase are that the lower arm transistor of the smallest phase is connected with 120 ° of section.Have as a result, in each phase
Electric current flows through, and makes direct current power back to power supply.
Current limit control unit 25 includes: the maximum phase current test section 25-1 of the maximum value of detection phase current, will examine
The transistor for the transistor that the threshold value comparison portion 25-2 and selection that the maximum phase current of survey is compared with threshold value are disconnected
(switch element) selector 25-3.
If the maximum value of phase current when detecting power supply regenerative by threshold value comparison portion 25-2 becomes current limit threshold,
Then make to regenerate the conducting of resistance 17.Meanwhile selectively being made only to go up phase in the two-phase of electric current flowing by transistor selector 25-3
Transistor disconnect.Also, disconnect the transistor of the upper phase of electric current flowing by grid signal preparing department 33.As a result, to friendship
The regenerated electric current in galvanic electricity source 5 is reduced.In addition, resistance absorption cannot be reproduced to the regenerated electric power of the regenerated part of AC power source 5.
If the maximum value of phase current when power supply regenerative is reduced to current restriction release threshold value, make the transistor turns disconnected.Together
When, make to regenerate the disconnection of resistance 17.Source current is controlled between current limit threshold and current restriction release threshold value as a result,.
In the case wheres unbalanced power supply etc., the electric current of specific phase increases.Therefore, when the electric current of the phase reaches electric current limit
When threshold value processed, limit to the regenerated electric current of AC power source 5.Also, resistance 17 cannot be reproduced to the regenerated part of AC power source 5
It absorbs.Even if unbalanced power supply as a result, system will not stop because of overcurrent, can continue to operate.
In addition, the absorption of resistance 17 cannot be reproduced to the regenerated regenerated electric power of AC power source 5.Therefore, be able to suppress: because
During limiting power supply regenerative electric current, the voltage of partes glabra becomes excessive, and leads to the transistor 7a-1-1 for making converter 7 again
Excessive electric current is flowed through Deng when being connected.
In addition, disconnecting the transistor of the only upper phase in the two-phase of electric current flowing.Therefore, the voltage between phases generated when disconnection
Become 1/2 compared with when full phase disconnects.By forcibly disconnecting the electric current for flowing through ACL15 using transistor 7a-1-1 etc.,
Generate above-mentioned voltage between phases.
Fig. 2 is the figure for indicating the circuit operation example of converter 7.In example described below, as shown in (a) of Fig. 2, R
Transistor turns in phase and under S phase.In addition, electric current I1 passes through the opposite system power flow of R of ACL15 from the transistor in R phase.This
Outside, the transistor flow under the opposite S phase of the S of electric current I2 from ACL15.In this state, reach electric current limit when electric current increases
When threshold value processed, disconnect the transistor in R phase and both under S phase, then as shown in (b) of Fig. 2, R phase becomes the diode of downside
It is connected (electric current I3), the current potential of V1 becomes-VDC.On the other hand, S phase becomes the diode current flow of upside.As a result, the electricity of V2
Position becomes+VDC (electric current I4).Fig. 3 is the figure for indicating the time of associated voltage interdependent i.e. signal waveform.Therefore, such as (a) of Fig. 3
Shown, the voltage between phases of R phase and S phase generates the voltage change of 2 × VDC.
If the electric current for disconnecting decline by transistor as current restriction release threshold value, makes in R phase again and S phase
Under transistor turns.The current potential of V1 becomes+VDC as a result,.The current potential of V2 becomes-VDC.As a result, generating the voltage of 2 × VDC
Variation.Also, if electric current increases and reaches current limit threshold again, disconnect the transistor in R phase and under S phase.Benefit
With the alternate capacitor C for the noise filtering being arranged in power input part, inhibit the variation of this voltage between phases.But
Meanwhile biggish pulsating current flows through alternate capacitor C.
In general, the capacitive coupling device of noise filtering uses thin film capacitor etc..If the virtual value of pulsating current is more than
The permission pulsating current of capacitor, then capacitive coupling device is damaged.
In contrast, when maximum phase current reaches current limit threshold, it, can if only disconnecting the transistor of phase
Enough reduce the variable quantity of voltage between phases.For example, passing through the transistor turns in R phase and under S phase, electric current as shown in (a) of Fig. 2
The opposite system power flow of R for passing through ACL15 from the transistor in R phase, in addition, the transistor under the opposite S phase of the S of electric current from ACL15
When flowing, as shown in (c) of Fig. 2, the transistor in R phase is only made to disconnect (electric current I5).R phase becomes the diode current flow of downside.
The current potential of V1 becomes-VDC.On the other hand, S phase keeps the transistor turns of downside.The current potential of V2 remains-VDC.Therefore, R phase
Become 0V with the voltage between phases of S phase.As shown in (b) of Fig. 3, the voltage change of VDC is only generated.
In addition, the voltage applied to ACL becomes 1/2.Therefore, the decline of electric current also slows down.Also, if electric current drops to
Threshold value then makes the transistor turns in R phase again.Therefore, to power supply regenerative electric current.As shown in (b) of Fig. 3, only with the electricity of VDC
Buckling reaches the number of current limit threshold, generates voltage between phases waveform at this time.As a result, if when current limit only makes
The grid of phase disconnects, then the variation of voltage between phases becomes 1/2.Thus, it is possible to reduce the number of current limit.In addition, also reducing
Noise from ACL to source side that leaked by.Thereby, it is possible to so that the pulsating current of alternate capacitor is also become smaller.As a result,
It is able to suppress the service life decline of capacitive coupling device, and can be improved the reliability of control device of electric motor.Furthermore it is possible to not make
The grid of the transistor of upper phase disconnects.As long as that is, disconnecting the grid of the transistor of any one phase in the two-phase of conducting.
As described above, in the embodiment, in the control device of electric motor for carrying out power supply regenerative, when power supply regenerative
When the maximum value of phase current reaches current limit threshold, disconnect the transistor of the only phase in the two-phase of conducting.Thus, it is possible to
Electric current is limited, while can use regeneration resistance absorption cannot be to the regenerated electric power of power supply regenerative.
According to the control device of electric motor provided using aforesaid way, even if super to the electric current of power supply regenerative when power supply regenerative
Threshold value is crossed, system will not stop at once.As a result, also can continue to operate even if generating imbalance in three phase mains.Together
When, power supply noise can be reduced.
In the above-described embodiment, it is not limited to structure shown in the drawings etc..It can not influence effect of the present invention
In range, the control device of electric motor of above embodiment is suitably changed.In addition, without departing from the model of the purpose of the present invention
It encloses, can suitably change and implements above embodiment.
Each structural element of the invention is selected furthermore, it is possible to arbitrarily accept or reject.In addition, with the knot after above-mentioned choice selection
The embodiment of structure element is also included in the technical scope of the present invention.
Control device of electric motor of the invention can be the following first~the 5th control device of electric motor.
Above-mentioned first control device of electric motor is characterized in that, includes converter, and three-phase alternating-current supply is converted to directly
Stream；Inverter is connect with the converter and motor, and drives the motor；And control circuit, carry out described turn
The control of parallel operation, the control circuit include maximum phase current test section, detect the maximum value of phase current；And threshold value ratio
Compared with portion, the maximum value for the phase current that will test is compared with threshold value, when detecting power supply regenerative by the threshold value comparison portion
When the maximum value of phase current becomes current limit threshold, carried out in a manner of making the voltage between phases of two-phase of electric current flowing become zero
Control.
Above-mentioned second control device of electric motor is on the basis of above-mentioned first control device of electric motor, which is characterized in that institute
The outlet side for stating converter also has regeneration resistance, the maximum of phase current when detecting power supply regenerative by the threshold value comparison portion
When value becomes current limit threshold, the regeneration resistance is connected in the control circuit.
On the basis of above-mentioned first or second control device of electric motor, feature exists above-mentioned third control device of electric motor
In the converter is made of the three-phase bridge circuit comprising six switch elements and diode, and the control unit has selection
The switch element selector of any one in the switch element, so that by the switch member of switch element selector selection
The mode that part disconnects is controlled.
On the basis of above-mentioned first or second control device of electric motor, feature exists above-mentioned 4th control device of electric motor
In, the control circuit also include the phase detecting circuit for detecting the three-phase alternating-current supply phase, current limit control unit,
The grid signal preparing department of the grid signal of power regenerating judging part and the production switch element.
On the basis of above-mentioned first or second control device of electric motor, feature exists above-mentioned 5th control device of electric motor
In, the control circuit so that the phase of the phase and minimum voltage of maximum voltage in the phase of three-phase alternating-current supply when regeneration operating
The mode of switching elements conductive is controlled.
The detailed description is had been presented for for purposes of illustration and description.According to introduction above, many deformations
It is all possible with changing.The detailed description is not without omission or is intended to limit the theme described herein.Although
The theme is illustrated with distinctive structure feature and/or method process by text, but it is to be understood that,
Theme defined in the claims is not necessarily limited to the specific features or detailed process.More precisely, will
The specific features and detailed process are illustrated as the example for implementing claims.
Claims (5)
1. a kind of control device of electric motor, it is characterised in that include
Three-phase alternating-current supply is converted to direct current by converter；
Inverter is connect with the converter and motor, and drives the motor；And
Control circuit carries out the control of the converter,
The control circuit includes
Maximum phase current test section detects the maximum value of phase current；And
The maximum value in threshold value comparison portion, the phase current that will test is compared with threshold value,
When detecting power supply regenerative by the threshold value comparison portion, the maximum value of phase current becomes current limit threshold, so that electric
The voltage between phases of the two-phase of flowing controls the converter as zero mode.
2. control device of electric motor according to claim 1, which is characterized in that
Also there is regeneration resistance in the outlet side of the converter,
When detecting power supply regenerative by the threshold value comparison portion, the maximum value of phase current becomes current limit threshold, the control
The regeneration resistance is connected in circuit processed.
3. control device of electric motor according to claim 1 or 2, which is characterized in that
The converter includes three-phase bridge circuit, and the three-phase bridge circuit includes six switch elements and diode,
The control circuit has the switch element selector of any one selected in the switch element,
The converter is controlled, makes to be disconnected by the switch element that the switch element selector selects.
4. control device of electric motor according to claim 1 or 2, which is characterized in that the control circuit also includes detection
Described in the phase detecting circuit of the three-phase alternating-current supply phase, current limit control unit, power regenerating judging part and production
The grid signal preparing department of the grid signal of switch element.
5. control device of electric motor according to claim 1 or 2, which is characterized in that the control circuit is to the conversion
Device is controlled, and the described of the phase of the phase and minimum voltage of maximum voltage in the phase of three-phase alternating-current supply is opened
Close element conductive.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017117106A JP2019004603A (en) | 2017-06-14 | 2017-06-14 | Motor controller |
| JP2017-117106 | 2017-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109088577A true CN109088577A (en) | 2018-12-25 |
Family
ID=64839787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810586877.1A Pending CN109088577A (en) | 2017-06-14 | 2018-06-08 | Control device of electric motor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2019004603A (en) |
| CN (1) | CN109088577A (en) |
| PH (1) | PH12018000166A1 (en) |
| TW (1) | TW201905474A (en) |
-
2017
- 2017-06-14 JP JP2017117106A patent/JP2019004603A/en active Pending
-
2018
- 2018-06-08 CN CN201810586877.1A patent/CN109088577A/en active Pending
- 2018-06-12 TW TW107120108A patent/TW201905474A/en unknown
- 2018-06-14 PH PH12018000166A patent/PH12018000166A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019004603A (en) | 2019-01-10 |
| TW201905474A (en) | 2019-02-01 |
| PH12018000166A1 (en) | 2019-12-11 |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181225 |