CN107645252A - The startup method and decanter type centrifugal separating device of three phase induction motor - Google Patents
The startup method and decanter type centrifugal separating device of three phase induction motor Download PDFInfo
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- CN107645252A CN107645252A CN201710455645.8A CN201710455645A CN107645252A CN 107645252 A CN107645252 A CN 107645252A CN 201710455645 A CN201710455645 A CN 201710455645A CN 107645252 A CN107645252 A CN 107645252A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
- B04B9/10—Control of the drive; Speed regulating
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Abstract
The present invention provides a kind of startup method of three phase induction motor, compared with basic startup method, can reduce the temperature of the three phase induction motor elevated amplitude in the start-up course of sedimentation-type centrifuge by the startup method.The rotating cylinder for the decanting centrifuge that processed material is centrifuged by the startup method of the three phase induction motor carries out acceleration rotation from halted state to target velocity, it is characterized in that, in the state of electrical connection of the power supply with the three phase induction motor is realized in a manner of star-star connection, while sheared using the waveform of voltage of the IGCT to being supplied from the power supply to the three phase induction motor, while the three phase induction motor is started, and, when the current effective value of the three phase induction motor reduces in start-up course, increase the processing of the angle of flow of the IGCT.
Description
Technical field
The present invention relates to the sedimentation-type centrifuge for making processed material is centrifuged (decanter) rotating cylinder (bowl)
Accelerate the startup method of the three phase induction motor of rotation from halted state to target velocity.
Background technology
The known sedimentation-type centrifuge as the centrifugal separating device for separation of solid and liquid.The sedimentation-type centrifuge is used for example
Such as Corvic (PVC), polyethylene, polystyrene, the dewater treatment of the various synthetic resin of polypropylene.Typically
In the case of, this sedimentation-type centrifuge has：Rotating cylinder, it applies centrifugal force to processed material and carries out separation of solid and liquid；Helical feed
Device, it conveys the solid after separation of solid and liquid towards outlet；Three phase induction motor, its be used to being driven rotating cylinder with
Make its rotation；And frequency conversion (inverter) device, it carries out VFC to three phase induction motor.
Rotating cylinder is the larger big machinery of moment of inertia, therefore, the chi of three phase induction motor and startup frequency converter
It is very little to become to maximize and cause cost to increase.In addition, because being mixed into noise in the electric current of the power supply to frequency converter supply electric power and
Make it possible to produce malfunction by the electrical equipment of the power drives.Made an uproar because the size with frequency converter is proportionally mixed
Sound also becomes big, and therefore, in the field of centrifugal separating device, it is a very important problem that startup frequency converter, which is omitted,.
Here, patent document 1 discloses a kind of starting current restraining device of electric blowing machine, the electricity of the electric blowing machine
Motivation has star triangle start device, it is characterised in that the contact relative to the on-off for carrying out motor power line is arranged side by side
Ground is provided with IGCT (thyristor) the voltage variable device for causing the service voltage of power line to reduce during startup.
Star triangle start is initially to implement star (Y) wiring for the distribution being connected with three phase induction motor and start,
And the Starting mode of triangle (△) wiring is switched in the stage close to synchronous rotary speed, starting current and detent torque drop
It is low when arriving direct-on-line starting 1/3, therefore load when can reduce startup.That is, in the case of voltage identical, star starts
Electric current and torque be reduced to triangle start when 1/3.
Citation
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2003-134864 publications
The content of the invention
The present inventor to by the star triangle start device of above-mentioned patent document 1 be used as sedimentation-type centrifuge startup
The scheme of device is studied.That is, the present inventor have studied following method：Realized in a manner of star-star connection
In the state of the electrical connection of power supply and three phase induction motor, while using IGCT to being supplied from power supply to three phase induction motor
The waveform for the voltage given is sheared (cut off), while starting the three phase induction motor (hereinafter referred to as basic startup side
Method).
In recent years, in order to improve treatment effeciency, it is desirable to shorten from sedimentation-type centrifuge stopping untill restarting
Time.Sedimentation-type centrifuge is the very big heavy mechanical equipment of moment of inertia, therefore is needed during startup with higher than rated current
Current value and acted three phase induction motor, easily become superheat state so as to three phase induction motor.That is, settle
Formula centrifuge just stop after three phase induction motor temperature it is higher, therefore, if without defined cool time, nothing
Method restarts three phase induction motor.If in the state of cooling is insufficient restarting, it is possible to burn in start-up course
Bad three phase induction motor.
Start method on basic, time (that is, the three-phase induction from sedimentation-type centrifuge stopping untill restarting
The cool time of motor) it is longer, it is therefore desirable to which the temperature for further reducing three phase induction motor opens in sedimentation-type centrifuge
Elevation amplitude during dynamic.
Therefore, it is an object of the invention to：The temperature for reducing three phase induction motor compared with basic startup method exists
Elevation amplitude in sedimentation-type centrifuge start-up course.
(process for completing the present invention)
The present inventor obtains the various service datas in basic startup method, and finds：The electricity of three phase induction motor
Stream virtual value constantly reduces in start-up course.Although its reason is simultaneously uncertain, however, it is possible to think：If current effective value drops
Low, then the torque of three phase induction motor reduces, and starts time lengthening, therefore, three phase induction motor becomes in start-up course
For superheat state.Therefore, the present inventor has drawn following opinion：By being carried out to the current effective value in start-up course
Monitor and the angle of flow of IGCT is controlled, can suppress current effective value reduces (hereinafter referred to as low-temperature start method).
Still further, it was discovered that：Compared with basic startup method, the temperature liter of three phase induction motor can be reduced by low-temperature start method
High-amplitude.
That is, basic startup method is to start three phase induction motor with the less current effective value of average value, and is spent
Long period and cause the rotating cylinder method that accelerates to target velocity.On the other hand, low-temperature start method is higher with average value
Current effective value starts three phase induction motor, and the method for causing rotating cylinder to accelerate to target velocity in a short time.
As described below, more specific description is carried out to low-temperature start method.
That is, the startup method of (1) a kind of three phase induction motor, processed material is carried out by the startup method from
The rotating cylinder of the decanting centrifuge of heart separation carries out acceleration rotation from halted state to target velocity, it is characterised in that：
In the state of the electrical connection that power supply and the three phase induction motor are realized in a manner of star-star connection, while utilizing IGCT pair
The waveform of the voltage supplied from the power supply to the three phase induction motor is sheared, while the three-phase induction is electronic
Machine starts, also, when the current effective value of the three phase induction motor is less than setting in start-up course, is increased
The processing of the angle of flow of the IGCT.
(2) the startup method of the three phase induction motor according to above-mentioned (1), it is characterised in that：In start-up course
The angle of flow is brought up into maximum.
(3) the startup method of the three phase induction motor according to above-mentioned (1) or (2), it is characterised in that：When described turn
When cylinder reaches target velocity, the mode of the electrical connection is switched into delta connection mode from star-star connection mode.
In addition, other schemes (4) as the present application are a kind of decanter type centrifugal separating devices, it is characterised in that
Possess：Rotating cylinder, processed material is centrifuged for it；Three phase induction motor, it makes the rotating cylinder from halted state to target
Speed carries out acceleration rotation；Switching part, it is between star-star connection mode and delta connection mode to power supply and the three-phase
The mode of the electrical connection of induction conductivity switches over；IGCT, it from the power supply to the three phase induction motor to supplying
The waveform for the voltage given is sheared；And IGCT control unit, its action to the IGCT is controlled, described three
During the startup of phase induction motor, the mode of the electrical connection is set as star-star connection mode, also, work as the three-phase induction
When the current effective value of motor is less than setting, the IGCT control unit increase the place of the angle of flow of the IGCT
Reason.
According to the present application, compared with basic startup method, the temperature that can reduce three phase induction motor is settling
Elevated amplitude when formula centrifuge starts.
Brief description of the drawings
Fig. 1 is the schematic cross sectional view of pressure-bearing type sedimentation-type centrifuge.
Fig. 2 is the circuit diagram of drive device.
Fig. 3 A schematically show the voltage waveform carried out using IGCT before phase controlling.
Fig. 3 B schematically show the voltage waveform carried out using IGCT after phase controlling (angle of flow is θ 1).
Fig. 3 C schematically show the voltage waveform carried out using IGCT after phase controlling (angle of flow is θ 2).
Fig. 4 is the flow chart illustrated for the startup method to three phase induction motor.
Description of reference numerals
1 three phase induction motor
2 IGCT control units
3 three-phase alternating-current supplies
10 housings
20 rotating cylinders
30 auger conveyors
40 supply nozzles
50 drive devices
MC1~MC3 electromagnetic contactors
Z1~Z3 stator winding
Embodiment
Fig. 1 is the schematic cross sectional view of pressure-bearing type sedimentation-type centrifuge (equivalent to decanter type centrifugal separating device).But this
Application invention can also be applied to longitudinal sedimentation-type centrifuge.Sedimentation-type centrifuge 100 includes：Housing 10；Rotating cylinder 20, it is received
It is contained in the inside of housing 10；Auger conveyor 30, it is configured at the inner side of rotating cylinder 20；Supply nozzle 40, it is used for supply and contained
The processed liquid of solid；And drive device 50, it rotates rotating cylinder 20.
In the bottom of housing 10,11 are exported formed with heavies in a side of the rotation direction of principal axis of rotating cylinder 20, another
One side is formed with light fraction outlet 12.Belt wheel 52 is transferred to via rotating band 51 by the power that drive device 50 generates,
And because belt wheel 52 rotates and so that rotating cylinder 20 rotates.In addition, via the gear-box 53 as differential generation mechanism, splined shaft 54 with
And sleeve 55 and power is transferred to auger conveyor 30, thus enable that rotating cylinder 20 and auger conveyor 30 with defined speed
Difference is rotated.
One side of the main part of rotating cylinder 20 is formed as cylindric.Another side is formed as coniform.The opening of one side
Closed by the front hub (front hub) 21 of circle in portion.Is formed by the position 22 of cylindrical shape feed to that the inside of rotating cylinder 20 supplies by
Manage liquid storage tank (pool) portion of liquid storage.On the other hand, coniform position 23 forms defeated by auger conveyor 30 by making
Dehydration (beach) portion that the heavies of the another side of rotating cylinder 20 depart from and are dehydrated from liquid is sent to, in its end shape
Into there is heavies outlet 24.
In front hub 21 formed with light fraction outlet 25, the paste liquid containing light fraction is in a manner of overflow from this
Light fraction outlet 25 is discharged.Dykes and dams shape (dam), which is internally provided with, in the light fraction outlet 25 forms part 26, the dike
Dam shape forms part 26 with the inclined inclined plane of rotation shaft side towards rotating cylinder 20.
Auger conveyor 30 main part formed with the helical blade 31 extended along outer peripheral face, and internally formed with
Buffer part 32, the leading section of supply nozzle 40 are stretched out to the inside of the buffer part 32.The liquid to be treated discharged from supply nozzle 40
Body is being supplied to the inside of buffer part 32, under the influence of centrifugal force and by from the confession that is formed about of central portion in main part
Discharged to mouth 33 to the inside of rotating cylinder 20.
Next, drive device 50 is described in detail reference picture 2.Fig. 2 is the circuit diagram of drive device.Drive device
50 include：Three phase induction motor 1, IGCT control unit 2, electromagnetic contactor MC1, electromagnetic contactor MC2, electromagnetic contactor
MC3.Three phase induction motor 1 generates heat during driving, if its heating temp, which exceedes, allows temperature, can produce three-phase induction
The problems such as coil of motor 1 is burnt out.Stator winding Z1, Z2 and Z3 of three phase induction motor 1 respectively with power line R, S and T
Connection, IGCT control unit 2 are arranged between three-phase alternating-current supply 3 and three phase induction motor 1.
Electromagnetic contactor MC3 is arranged in correspondence with power line R, S and T respectively, and to divide relative to IGCT control unit 2
The bypass circuit of branch is switched on or switched off.When electromagnetic contactor MC3 is set to OFF into state, exported from three-phase alternating-current supply 3
Electric current supplied via IGCT control unit 2 to three phase induction motor 1.When electromagnetic contactor MC3 is set as into closed form
During state, the electric current exported from three-phase alternating-current supply 3 shunts relative to IGCT control unit 2 and is supplied to three phase induction motor 1.
In order to be switched between delta connection and star-star connection to stator winding Z1, Z2 and the Z3 mode of connection and
Electromagnetic contactor MC1 and MC2 are operated.In addition, electromagnetic contactor MC1 and MC2 is described equivalent in claims
" switching part "., can be to fixed when electromagnetic contactor MC1 is in closure state and electromagnetic contactor MC2 is off
Sub- winding Z1, Z2 and Z3 carry out star-star connection and cause three phase induction motor 1 to carry out star startup.In electromagnetic contactor MC1
It is off and when electromagnetic contactor MC2 is in closure state, triangle can be carried out to stator winding Z1, Z2 and Z3
Wiring and cause three phase induction motor 1 carry out triangle startup.The caloric value of star-star connection is the caloric value of delta connection
1/3, therefore higher efficiency can be realized in low speed rotation speed domain.
The voltage of electric power of the IGCT control unit 2 to being supplied from three-phase alternating-current supply 3 carries out phase controlling.So-called phase control
System refers to voltage is adjusted by changing the time (conduction angle) of voltage waveform (sine wave) conducting.Fig. 3 A are schematic
Ground shows the voltage waveform that (that is, conduction angle is set as the π as maximum) before phase controlling is carried out using IGCT.
Fig. 3 B schematically show the voltage waveform when angle of flow to be set as to θ 1.Fig. 3 C, which are schematically shown, sets the angle of flow
For θ 2 when voltage waveform.Wherein, conduction angle 2 is more than conduction angle 1.
By making the angle of flow increase to θ 2, the time lengthening of voltage waveform (sine wave) conducting from θ 1, therefore can increase
Voltage.Thus, the current effective value rise of three phase induction motor 1, so as to increase torque.On the contrary, by making the angle of flow
θ 1 is reduced to from θ 2, the time of voltage waveform (sine wave) conducting shortens, therefore can reduce voltage.
Here, the current effective value of three phase induction motor 1 can obtain from the U terminals of three phase induction motor 1.Brilliant lock
Pipe control unit 2 is changed based on the current effective value obtained from U terminals to conduction angle, this is carried out below in detail
Narration.It is effective as the electric current of three phase induction motor 1 alternatively, it is also possible to the current value that will be obtained from V terminals or W terminals
Value.
IGCT can also be by grid current is flowed to negative electrode (K) from grid (G) and anode (A) and negative electrode
(K) semiconductor rectifier cell turned between.That is, when causing constant current to be flowed out from grid (G), anode (A) and negative electrode (K)
Between turn on and (turn on) and persistently tend to remain on constant.During conducting state continues, and from three-phase alternating current
The voltage waveform that the voltage waveform for the alternating electromotive force that source 3 supplies is substantially equivalent exports from IGCT control unit 2.
When the electric current that negative electrode (K) is flowed to from anode (A) is decreased to below steady state value, conducting state stops (turn
off).When conducting state stops, the voltage exported from IGCT control unit 2 becomes 0 (V).Reduced by using IGCT
The voltage supplied to three phase induction motor 1, thus enables that the electric current of three phase induction motor 1, output torque reduce.
Following tables 1 shows that the electric current and three-phase induction flowed when triangle starts in three phase induction motor 1 is electronic
The relation of the output torque of machine 1.Wherein, start and the phase controlling based on IGCT is not carried out in method A (that is, conduction angle is most
Greatly).In method B is started, phase controlling is carried out using IGCT, so that 1/ when voltage is reduced to startup method A
√3.In method C is started, phase controlling is carried out using IGCT, so that 1/3 when voltage is reduced to startup method A.
【Table 1】
As shown in table 1, method B is started compared with starting method A, output torque is reduced to 1/3, starts method C with starting
Method A is compared, and output torque is reduced to 1/9.In addition, following relation can be obtained according to table 1：When according to P=ω T and by rotating speed
When being set to constant, torque is directly proportional to voltage × electric current, the output torque of three phase induction motor and voltage it is square directly proportional,
In three phase induction motor flowing, the electric current varies directly with the voltage.
Following tables 2 shows the electric current and three phase induction motor flowed when star starts in three phase induction motor 1
The relation of 1 output torque.In method E is started, phase controlling is carried out using IGCT, so that voltage is reduced to startup
1/ √ 3 during method D.
【Table 2】
It is compared to starting method A and D, in the case of voltage identical, star starts compared with triangle starts, electricity
Stream is reduced to 1/3, and the output torque of three phase induction motor 1 is reduced to 1/3.In addition, (start method C to starting method B and D
And E) be compared, the current value for starting 1/ √ 3 that can start with triangle by star starts phase to obtain with triangle
Same output torque.Further, since the caloric value of three phase induction motor 1 and electric current is square directly proportional, therefore, when with identical
Output torque when being compared, the caloric value that star starts is reduced to 1/3 when triangle starts.
According to above-mentioned opinion, in the state of star-star connection is carried out to stator winding Z1, Z2 and Z3, while utilizing IGCT
Voltage waveform is sheared, while three phase induction motor 1 is started into (i.e., above-mentioned basic startup method), thus, it is possible to press down
The temperature of three phase induction motor 1 processed raises in start-up course.
In order to further suppress the rise of the temperature of three phase induction motor 1, in the present embodiment, carry out suppressing three-phase sense
The control that the current effective value of induction motor 1 reduces.Specifically, while monitoring three phase induction motor 1 current effective value,
While increase the control of conduction angle with so that the current effective value will not be reduced relative to setting (that is, using above-mentioned
Low-temperature start method starts sedimentation-type centrifuge).Although reason is simultaneously uncertain, opened substantially fix conduction angle
In dynamic method, current effective value constantly reduces in start-up course.As a result, torque reduces and the startup time is elongated, therefore,
Make rotating cylinder 20 from halted state accelerate to target velocity when temperature elevation amplitude increase.
Low-temperature start method is described in detail the flow chart of reference picture 4.In an initial condition, by stator winding
Z1, Z2 and Z3 are set as star-star connection, and conduction angle is set smaller than to π value.Startup refers to：So that rotating cylinder 20 is from stopping
State (rotary speed is 0 (%)) carries out acceleration rotation to target velocity (rotary speed is 100 (%)).
In step S101, IGCT control unit 2 is proceeded by the monitoring of the current effective value of three phase induction motor 1
Reason.Current effective value can obtain from the U terminals of three phase induction motor 1.The monitoring period of current effective value can be real-time
Or specified period.Monitoring period is shorter, then easier that current effective value is maintained into setting therefore more preferred.
In step s 102, IGCT control unit 2 differentiates whether current effective value reduces.That is, IGCT control unit 2 stores
There is the information related to required current effective value, and differentiate whether the current effective value got has less than the required electric current
Valid value.In addition, required current effective value can be the scope of specific value or value.
In the case where current effective value reduces (step S102 Yes), processing enters step S103.In current effective value
In the case of not reducing (step S102 No), processing enters step S104.
In step s 103, IGCT control unit 2 is by increasing conduction angle and current effective value increases.Because of electric current
Virtual value increase and cause three phase induction motor 1 torque rise, so as to shorten rotating cylinder 20 reach target velocity when
Between.Here, low-temperature start method reaches the current value of target velocity compared with the basic startup method for fixing conduction angle
Average value increases, and still, the time for reaching target velocity shortens, therefore can reduce the temperature elevation amplitude in start-up course.
On this point, proved in embodiment described later.
Here, the conduction angle started when starting can suitably be set according to species of three phase induction motor 1 etc..But
It is preferably to be set to conduction angle：Only just rotating cylinder 20 can be made to reach target velocity by low-temperature start method.In addition, work as
It can not be obtained before reaching target velocity for making rotating cylinder 20 accelerate during required torque, it is necessary to be changed to energy in start-up course
Enough startup methods (such as, started in a manner of delta connection method) for obtaining more high torque (HT).Even in this case,
Before switching to delta connection, start also by low-temperature start method, be temperature elevation amplitude therefore, it is possible to overall merit
Less startup method.
In step S104, IGCT control unit 2 differentiates whether the speed of rotating cylinder 20 has reached target velocity.In rotating cylinder 20
Speed reached target velocity in the case of (step S104 Yes), processing enters step S105, rotating cylinder 20 speed not
In the case of reaching target velocity (step S104 No), processing is back to step S101.
In step S105, conduction angle is set as π (that is, the shear treatment of interrupt voltage waveform), and for stator
Winding Z1, Z2 and Z3 switch to delta connection from star-star connection.Thus, rotating cylinder 20 maintain target velocity, while with etc.
Speed is rotated, and thus continuously processed material is handled.Here, after the rotary speed of rotating cylinder 20 reaches target velocity
(that is, starting after finishing), when being driven by frequency converter to three phase induction motor 1, produces power loss.In this implementation
In mode, after the rotary speed of rotating cylinder 20 reaches target velocity, rotating cylinder 20 is driven by way of delta connection
It is dynamic, therefore the power loss as caused by frequency converter can be eliminated.In addition, by the way that frequency converter is omitted can make drive device 50
Realize miniaturization.
(embodiment)
In order to confirm the elevated difference of the temperature as caused by starting method and low-temperature start method substantially, actually make sedimentation
Formula centrifuge starts and the temperature change of three phase induction motor 1 is investigated.Sedimentation-type centrifuge has used a diameter of
29 inches of large-scale sedimentation-type centrifuge.In basic startup method, surface temperature when three phase induction motor 1 starts to start
For 29 DEG C, conduction angle is fixed as (2/5) π.In low-temperature start method, surface temperature when three phase induction motor 1 starts to start
Spend for 26 DEG C, one side standby current virtual value, while making conduction angle from (2/5) π gradually increases and untill π is increased to.
As shown in table 3, in basic startup method, the time for reaching target velocity is about 17 minutes, reaches target velocity
When three phase induction motor 1 surface temperature be 80 DEG C.In addition, in low-temperature start method, reach the time of target velocity
About 6 minutes, the surface temperature of the three-phase guiding motor 1 when reaching target velocity was 61 DEG C.That is, on making three-phase induction electric
Elevated temperature when motivation 1 starts, is 51 DEG C in basic startup method, is 35 DEG C in low-temperature start method.Therefore, by using
Low-temperature start method, compared with basic startup method, the cool time from sedimentation-type centrifuge stopping untill restarting
Shorten, so as to improve the treatment effeciency of sedimentation-type centrifuge.
【Table 3】
Claims (6)
1. a kind of startup method of three phase induction motor, processed material is centrifuged by the startup method
The rotating cylinder of decanting centrifuge carries out acceleration rotation from halted state to target velocity,
The startup method of the three phase induction motor is characterised by,
In the state of electrical connection of the power supply with the three phase induction motor is realized in a manner of star-star connection, while utilizing crystalline substance
The waveform of voltage of the brake tube to being supplied from the power supply to the three phase induction motor sheared, while by the three-phase sense
Induction motor starts, also, when the current effective value of the three phase induction motor is less than setting in start-up course, enters
Row increases the processing of the angle of flow of the IGCT.
2. the startup method of three phase induction motor according to claim 1, it is characterised in that
The angle of flow is brought up into maximum in start-up course.
3. the startup method of three phase induction motor according to claim 1 or 2, it is characterised in that
When the rotating cylinder reaches target velocity, the mode of the electrical connection is switched into delta connection from star-star connection mode
Mode.
A kind of 4. decanter type centrifugal separating device, it is characterised in that
The decanter type centrifugal separating device possesses：
Rotating cylinder, processed material is centrifuged for it；
Three phase induction motor, it makes the rotating cylinder carry out acceleration rotation from halted state to target velocity；
Switching part, it is between star-star connection mode and delta connection mode to power supply and the electricity of the three phase induction motor
The mode of connection switches over；
IGCT, the waveform of its voltage to being supplied from the power supply to the three phase induction motor are sheared；And
IGCT control unit, its action to the IGCT are controlled,
In the startup of the three phase induction motor, the mode of the electrical connection is set as star-star connection mode, also, work as
When the current effective value of the three phase induction motor is less than setting, the IGCT control unit carries out increasing the IGCT
The angle of flow processing.
5. decanter type centrifugal separating device according to claim 4, it is characterised in that
The angle of flow is brought up to maximum by the IGCT control unit in start-up course.
6. the decanter type centrifugal separating device according to claim 4 or 5, it is characterised in that
When the rotating cylinder reaches target velocity, the switching part switches to the mode of the electrical connection from star-star connection mode
Delta connection mode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016142337A JP6121602B1 (en) | 2016-07-20 | 2016-07-20 | Start-up method of three-phase induction motor and decanter type centrifugal separator |
| JP2016-142337 | 2016-07-20 |
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| Publication Number | Publication Date |
|---|---|
| CN107645252A true CN107645252A (en) | 2018-01-30 |
| CN107645252B CN107645252B (en) | 2019-01-22 |
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| CN201710455645.8A Expired - Fee Related CN107645252B (en) | 2016-07-20 | 2017-06-16 | The starting method and decanter type centrifugal separating device of three phase induction motor |
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| Country | Link |
|---|---|
| JP (1) | JP6121602B1 (en) |
| KR (1) | KR101814392B1 (en) |
| CN (1) | CN107645252B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111974559A (en) * | 2020-08-24 | 2020-11-24 | 杭州乐垚生物科技有限公司 | Speed-limiting transmission device for stepless regulation of rotating speed of biological cell centrifuge |
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| CN109999555A (en) * | 2019-05-16 | 2019-07-12 | 河南龙成煤高效技术应用有限公司 | A kind of waste water centrifugal removing impurities machine |
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- 2016-07-20 JP JP2016142337A patent/JP6121602B1/en not_active Expired - Fee Related
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2017
- 2017-06-13 KR KR1020170073825A patent/KR101814392B1/en active IP Right Grant
- 2017-06-16 CN CN201710455645.8A patent/CN107645252B/en not_active Expired - Fee Related
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| CN101662247A (en) * | 2009-09-25 | 2010-03-03 | 中国北车集团大连机车车辆有限公司 | Current-limiting soft-starting method of asynchronous motor under wideband power supply |
| CN201499119U (en) * | 2009-09-25 | 2010-06-02 | 四川建设机械（集团）股份有限公司 | Starting device of electric motor |
| CN201699633U (en) * | 2010-07-04 | 2011-01-05 | 中南林业科技大学 | Three-phase asynchronous frequency-conversion starting device based on current control |
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| CN203482120U (en) * | 2013-09-18 | 2014-03-12 | 山东财源和信节能工程有限公司 | High-power motor starting system |
| CN104868795A (en) * | 2015-05-28 | 2015-08-26 | 中国北车集团大连机车车辆有限公司 | Motor starting control method of cooling fan of railroad locomotive |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111974559A (en) * | 2020-08-24 | 2020-11-24 | 杭州乐垚生物科技有限公司 | Speed-limiting transmission device for stepless regulation of rotating speed of biological cell centrifuge |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101814392B1 (en) | 2018-01-04 |
| JP6121602B1 (en) | 2017-04-26 |
| JP2018014810A (en) | 2018-01-25 |
| CN107645252B (en) | 2019-01-22 |
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