CN1006216B - Speed control device for elavator - Google Patents
Speed control device for elavator Download PDFInfo
- Publication number
- CN1006216B CN1006216B CN85103982.0A CN85103982A CN1006216B CN 1006216 B CN1006216 B CN 1006216B CN 85103982 A CN85103982 A CN 85103982A CN 1006216 B CN1006216 B CN 1006216B
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- CN
- China
- Prior art keywords
- elevator
- instruction
- speed control
- magnetic flux
- control unit
- Prior art date
- 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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Abstract
The present invention relates to a speed control device for an elevator, wherein the speed control device comprises a current mode converter which changes DC voltage into AC voltage with variable voltage and variable frequency and a cage for operating the elevator. The speed control device composed of an induction motor driven by a converted AC power supply and a speed control device increases the field strength of the induction motor before the starting of the elevator, and the field strength is reduced to a preset value after the elevator is started.
Description
The present invention relates to a kind of elevator speed control apparatus that drives by conv, reach the improvement rideability when particularly relating to the elevator starting.
Recent years, a kind of AC variable speed control setup of combining with cheap and durable alternating current dynamo and frequency converter is applied on the elevator.Particularly for those elevators in the low regime operation, carried out the primary voltage control of induction motor at present, the viewpoint from conservation energy is paid attention in AC speed regulating control more.
In order with control system above-mentioned controller performance to be equaled or to be better than DC machine, alternating current dynamo is also as DC machine, need be according to the component of current that helps to add magnet excitation (excitation component current i d), and with this component quadrature, help to strengthen component of current (the torque component current i of torque
g) and control primary current dividually, independently.
Control system will be illustrated with reference to figure 4, Fig. 5.In these figure, numbering 1 is meant the speed command producer, and it produces a speed command signal W
RRController of numbering 2 expressions, controller is accepted speed command signal W
RRThe speed detection signal W that is produced with a speed detector 12 of establishing for induction motor 11
r, and toward motor conveying primary current instruction i
UR, i
VR, i
WRController 2 comprises an adder 21, speed calculation circuit 22 and primary current command calculations circuit 23.Adder 21 is obtained speed command signal W
RRWith speed detection signal W
rThe deviation of the two.Speed calculation circuit 22 draws torque instruction T on the basis of deviation signal
RPrimary current command calculations circuit 23 is at torque instruction T
RWith speed detection signal W
rThe basis on obtain primary current instruction i
UR, i
VR, i
WR
Numeral 3 to 5 is all represented adder, and they obtain primary current instruction i respectively
UR, i
VR, i
WRWith the motor actual current i that records with current probe 8 to 10
u, i
v, i
wBetween deviation.Deviation signal is added to current control circuit 6, and on the basis of these deviation signals, it controls a frequency converter 7 again, can make primary current i like this
u, i
v, i
wRespectively with primary current instruction i
UR, i
VR, i
WRConsistent.Like this, controlledly present to induction motor 11 with predetermined alternating electromotive force from the electric current of frequency converter 7 outputs.
In addition, pulley of numeral 13 expressions, numeral 14 is twisted ropes, and numeral 15 is elevator cars, and numeral 16 is counterweights.
At this, the primary current command calculations circuit 23 in the controller 2 provides in Fig. 5.In Fig. 5, label 23a, 23b, 23c represent multiplier, 23d is an adder, and 23e is a sine wave generator, on the basis of adder 23d output, producer 23e output Cos θ, Sin θ, Cos(θ-2/3 π), Sin(θ-2/3 π) and component, 23f is one 2 phase/3 phase converter, at torque component current instruction value i
GR, flux component current instruction value i
DROn the basis of sine wave generator 23e output, conv 23f calculates and output primary current instruction i
UR, i
VRAnd i
WRThese component elements are calculated by following several equations:
Now with φ
2RRepresent secondary magnetic flux command value (" R " is the additional subscript of command value), torque component current instruction value i
GRProvide by following formula:
L in the formula
2: the secondary inductance of motor,
M: the mutual inductance of motor,
P: electrode logarithm.
And flux component current instruction value i
DRProvide by following formula
(R
2The secondary resistance of motor)
By equation (2) as seen, the magnetic flux φ in the motor
2Obviously be
The tracking that secondary like this magnetic flux is made first-order lag with the flux component electric current changes.
And, slip angular frequency instruction ω
SRBecome:
Primary current instruction i
UR, i
VR, i
WRFor:
i
μR＝-（i
μR+i
vR） …（7）
Wherein
(8)
Be generally used for because of permanent flux regulator in the control of elevator
φ
2R=Cons(constant) ... (9)
Equation (2) is simplified
That is be that multiplier 23a obtains torque component current instruction value i according to equation (1)
GRSize, multiplier 23b obtains slip angular frequency instruction W by equation (4)
SRSize, and 2 phases/3 phase converter 23f ask primary current instruction i by equation (5)-(7) respectively
UR, i
VRAnd i
WR
By equation (3) as can be known, the actual secondary magnetic flux of motor is with the d axle axial current i of motor
dDo the variation of first-order lag.
The circuit of pressing Fig. 5 composition is in order that with φ
2RThe form of/M provides i
DR, so d axle axial current elevator starting constantly releasing of brake produce in advance in the past, its objective is and set up a magnetic field, subsequently when magnetic field reaches predetermined value, releasing of brake, in the linear torque that provides an expectation, its form promptly:
(this just cry " preexcitation ") during this period of time (preexcitation time) need the 200-400 millisecond usually, during this period in, by making the mobile in advance magnetic field that produces a predetermined value of d axle axial current.And from the viewpoint of efficient operation or the like see also wish short as much as possible during this period of time.
In some senior elevator, the balancing device that is used to compensate the elevator unbalance load is configured in the elevator car 15, produces the torque of a compensation unbalance load constantly in starting, therefore, even have amount of unbalance when releasing of brake, elevator car does not have impact yet.
Yet, in the elevator of low cruise, do not dispose such device, after starting moment releasing of brake, elevator has impact, and the result is exactly that starting-impact has caused the reason of destroying smooth running.
Making the present invention is to provide a kind of speed control unit in order to eliminate above-mentioned shortcoming, to its objective is, this device, even do not add at elevator under the situation of balancing device and also do not produce starting-impact, and then also shorten the preexcitation time.
Fig. 1 illustrates embodiments of the invention to Fig. 3.Wherein Fig. 1 is a primary current command calculations circuit block diagram, and Fig. 2 is a command circuit block diagram, and Fig. 3 is the magnetic flux command value φ according to Fig. 2 circuit
2RCharacteristic map.
Fig. 4 and Fig. 5 illustrate the elevator speed control apparatus of prior art, and wherein Fig. 4 is the circuit block diagram of conventional speeds control setup, and Fig. 5 is the block diagram of a prior art example, corresponding to the circuit among Fig. 1.
In these accompanying drawings, prosign is represented identical or corresponding part.
Now, referring to figs. 1 through Fig. 3 embodiments of the invention are described.The embodiment that is described in Figure provides the secondary magnetic flux of motor, and it is only increasing field intensity (at preexcitation in the phase) under the elevator start mode, therefore,
(1) at preexcitation in the phase, make DC current flow through motor, form secondary magnetic flux, owing to strengthened this magnetic flux, the brake effect of DC current has strengthened a lot, even therefore the motion of the elevator car that is caused by unbalance load when brake is unclamped is also extremely suppressed.And,
(2) and then, because secondary magnetic flux has been provided the reinforcement field intensity, can understand from equation (11) to produce a bigger torque that the response of elevator speed control system is as a result accelerated.Therefore, improved the starting-impact of elevator.
Corresponding to the circuit among Fig. 5, Fig. 1 has shown embodiments of the invention, and wherein identical with Fig. 5 part is marked with identical label, numeral 231 and 238 expression dividers, numeral 232 to 234,237 and 239 is multipliers, 235 is differentiators, and numeral 236 is adders.
Usually, secondary magnetic flux φ
2With elementary d axle axial flow i in the motor
LdBecome first-order lag.For this reason, in order to make actual magnetic flux φ
2With φ
2REquate and be not with any hysteresis, magnetic flux instruction φ
2RIn the time of given, treat the instruction of given d axle axial current as below need to comprise a φ
2RDifferential term:
(Here it is, must be enforceable)
The circuit of Fig. 1 is used for realizing variable magnetic flux control, and adopts above-mentioned equation (12) as asking i
DRAccounting equation, in order that magnetic flux instruction might be equated with the actual magnetic flux of motor.Like this, as saying, the secondary magnetic flux of motor changes with secondary magnetic flux instruction does not have hysteresis significantly, preexcitation phase l
P(among Fig. 3) also can shorten.
Referring to the circuit of Fig. 1, differential term is included in the instruction of d axle axial current, thereby adjustable control becomes possibility.Yet this configuration does not comprise balancing device.Therefore, before releasing of brake,, the continuous current excitation electric current makes the motor DC excitation by being flow through.Like this, even when releasing of brake,, alleviated starting-impact because direct current brake effect motor also is difficult to revolve axle.This effect is more remarkable when further strengthening the excitation of motor.The field of this reinforcement is approximately the twice of motor normal condition, even when sending the instruction of strengthening field intensity more strongly, field intensity has also no longer been strengthened.This is because the saturated cause of electric machine iron core etc." normal field intensity " is exactly the field intensity of following situation in addition, provides field intensity under the rated voltage situation to motor under no-load condition.The field intensity time of being strengthened can be approximately until the elevator starting, and its reason is because the field that is reinforced has increased the magnetic disturbance of motor, therefore to continue there is not what benefit for a long time.
Secondly, Fig. 2 represents a field command circuit 17.In the figure, digital 171-173 represents resistor, and 174 is conies, and 175 is op amps, and 176 is reference voltage source (magnitude of voltage=V
Ref), 177 is switches, when elevator will stop or after the starting, does not open when the speed of elevator car reaches definite value always its contact.Speed reaches definite value and stops up to elevator, and the contact is closed always.Magnetic flux command value φ
GRThe circuit that illustrated by Fig. 3 is controlled.
As mentioned above, main points of the present invention are to strengthen the motor field intensity constantly in advance in the elevator starting, and after starting, it are reduced to a predetermined value, thereby improve starting ability.
Claims (10)
1, a kind of speed control unit that is used for elevator, but wherein DC current is changed into the exchange current of pressure regulation Frequency Adjustable by a current type converter, and the alternating electromotive force induction motor driven by the process conversion, this electrical motor is used for operate lifting machine cage;
One control setup receives the magnetic flux instruction of the torque instruction and the described motor field of control of the described motor torque of control, calculates the primary current instruction then, and sends this primary current instruction to described electrical motor,
The described speed control unit that is used for elevator is characterised in that and is included in the magnetic field of strengthening described electrical motor when beginning to drive elevator car, then with the device of described field weakening to predetermined value, the starting-impact that causes in order to the laod unbalance of eliminating owing to elevator car.
2, a kind of speed control unit that is used for elevator according to claim 1 is characterized in that, by the instruction that the high-intensity magnetic field instruction is the field intensity of an about double normal operation of generation that adds of described control setup transmission.
3, a kind of speed control unit that is used for elevator according to claim 1 is characterized in that, one receives described magnetic flux and instructs the circuit that calculates to comprise a differential circuit with described magnetic flux instruction carrying out differential.
4, a kind of speed control unit that is used for elevator according to claim 3, it is characterized in that, the circuit that the instruction of this magnetic flux of the described reception of described control setup is calculated comprises that a described magnetic flux instruction that will receive multiply by the multiplication unit of a pre-determined factor, one is carried out the differential circuit of differential with the output of described multiplication unit, and the adder with the output addition of the output of described differential circuit and described multiplication unit.
5, a kind of speed control unit that is used for elevator according to claim 3 is characterized in that comprising that a generation is added to the command circuit of the described magnetic flux instruction on the described control setup,
Described command circuit, when elevator will stop and after its starting, produce a higher output, till elevator car speed reaches predetermined value, and after elevator speed reaches predetermined value, produce a lower output till elevator stops.
6, a kind of speed control unit that is used for elevator according to claim 5, it is characterized in that, described command circuit comprises switching device, the unlatching of described switching device and closed state when elevator will stop and its speed of starting back reach a period of time of predetermined value and elevator after speed reaches predetermined value and change between a period of time that stops.
7, a kind of speed control unit that is used for elevator according to claim 5 is characterized in that, described command circuit is when transferring low output to from height output, and its output gradually changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103982.0A CN1006216B (en) | 1985-05-21 | 1985-05-21 | Speed control device for elavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103982.0A CN1006216B (en) | 1985-05-21 | 1985-05-21 | Speed control device for elavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103982A CN85103982A (en) | 1987-08-05 |
| CN1006216B true CN1006216B (en) | 1989-12-27 |
Family
ID=4793568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85103982.0A Expired CN1006216B (en) | 1985-05-21 | 1985-05-21 | Speed control device for elavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1006216B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108089537B (en) * | 2017-12-14 | 2020-06-19 | 天津京龙工程机械有限公司 | Speed-adjustable elevator control method |
-
1985
- 1985-05-21 CN CN85103982.0A patent/CN1006216B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85103982A (en) | 1987-08-05 |
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