CN1011688B - Speed control apparatus for elevator - Google Patents
Speed control apparatus for elevatorInfo
- Publication number
- CN1011688B CN1011688B CN 85101195 CN85101195A CN1011688B CN 1011688 B CN1011688 B CN 1011688B CN 85101195 CN85101195 CN 85101195 CN 85101195 A CN85101195 A CN 85101195A CN 1011688 B CN1011688 B CN 1011688B
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- mentioned
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- Control Of Ac Motors In General (AREA)
- Elevator Control (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to an elevator speed device which controls an AC motor by a rectifier and an inverter so as to drive an elevator cage, wherein the rectifier is composed of thyristor elements, and the inverter is composed of triodes and diodes. The device is provided with a voltage detector used for detecting AC power supply voltage and a minimum value selecting circuit used for comparing voltage signals of the voltage detector with output indications of a rectifier so as to control the speed. The minimum value selecting circuit adds a low level signal with the same electrical level into a voltage control circuit, and the low level signal is used as a corrected output signal.
Description
This is an invention about apparatus for contrelling elevator speed.This device is controlled elevator car speed by a power rectifier of being made up of thyristor (below be called rectifier) and power converter of being made up of aerotron and diode (below be called inverter) alternating-current motor/AC motor of control.
Explanation to prior art:
Fig. 1 is the block scheme of conventional apparatus for contrelling elevator speed.This device is open, as Japanese document Laid-Open162978/1981.Figure medium size number is represented respectively: 1. three-phase alternating-current supply; 2. the rectifier of being made up of thyristor is converted to direct current with source of AC; 3. rectifier is exported the cond that strobes; 4. the inverter of being made up of aerotron and diode will be converted to the alternating current of voltage variable, changeable frequency through the vdc of cond 3 filtering; 5. three-phase induction motor (being designated hereinafter simply as electrical motor); 6. the speed detector that is equivalent to tachogenerator one class directly cooperates with electrical motor 5; 7. the pulley that drives by electrical motor 5; 8. the rope on the pulley; 9. with rope one end bonded assembly elevator cage; 10. with rope other end bonded assembly bob-weight; 11. speed indication producer produces rate indicative signal 11a; 12. the speed control operation circuit compares rate indicative signal 11a with the speed signal 6a of speed detector 6, produce that an output indicator signal 12a delivers to rectifier 2 and a slip frequency indicator signal 12b delivers to inverter 4; 13. piezoelectric detector is used for detecting the voltage at cond 3 two ends; 14. voltage control function circuit; Output indicator signal 12a is compared with the voltage signal 13a of piezoelectric detector 13, produce a voltage instruction signal; 15. phase circuit, according to the pulse of voltage instruction signal generator gate, the thyristor of rectifier 2 is formed in control; 16. voltage indication generator circuit according to speed signal 6a and slip frequency indicator signal 12b, produces the voltage instruction signal of a sine; 17. voltage detecting circuit, detect the output voltage of inverter 4,18. pwm comparator, the voltage instruction signal that voltage indication generator circuit 16 is produced compares with the voltage signal that voltage detecting circuit 17 produces, and produces the pulse width modulation indicator signal; 19. the basic driver circuit according to pulse width modulation indicator signal generator gate signal, is formed the aerotron of inverter 4 in order to control.
By the apparatus for contrelling elevator speed that foregoing circuit produces, its three-phase alternating voltage carries out rectification and filtering through rectifier 2 and cond 3.At this moment, supply with electrical motor 5, elevator cage 9 is brought into operation through the alternating-current voltage/AC voltage of inverter 4 modulating pulse widths.
At this moment, speed detector 6 detects the velocity of rotation of electrical motor 5, and the speed signal 6a of elevator cage 9 delivered to speed control operation circuit 12, this circuit compares with rate indicative signal 11a speed signal 6a, produce output indicator signal 12a and slip frequency indicator signal 12b, deliver to voltage control function circuit 14 and voltage indication generator circuit 16 respectively.
If output indicator signal 12a is arranged as given value, and the speed signal of piezoelectric detector 13 is as value of feedback, and then voltage control function circuit 14 will produce voltage instruction signal, makes the poor vanishing of two signal values.Receive this voltage instruction signal by phase circuit 15 then, the thyristor of control rectifier 2.
According to slip frequency indicator signal 12b and speed signal 6a, voltage indication generator circuit 16 produces the voltage instruction signal of a sinusoidal waveform and delivers to pwm comparator 18.If have voltage instruction signal as the voltage signal of given value and voltage detector circuit as value of feedback, impulse modulation comparator 18 will produce a pulse width indicator signal, makes the difference vanishing of two signal numerical value.Then the pulse width modulation indicator signal is delivered to basic driver circuit 19, in order to the base current of control inverter 4.
Like this, voltage and the frequency of delivering to electrical motor 5 are all controlled, and the speed of elevator cage 9 is also accurately controlled by the rate indicative signal 11a that speed indication producer 11 produces.
Fig. 2 is the detailed circuit diagram of voltage control function circuit 14 above-mentioned, and resistor 20 and an end of 21 join with speed control operation circuit 12 and piezoelectric detector 13 respectively among the figure; The reverse input end of operational amplifier 24 (one) connects with the other end of two resistors, and mouth connects with phase circuit 15; Resistor 22 and cond 23 are connected between the reverse input end () and this amplifier out of operational amplifier 24; An input end of comparator 25 connects with the mouth of operational amplifier 24, and another input end and reference voltage V ref ' link, output termination phase circuit 15.
In Fig. 2, after voltage instruction signal 12a imports by resistor 21 by resistor 20 and voltage signal 13a, deliver to phase circuit 15 with two cooresponding voltage signal 24a of incoming signal difference.Comparator 25 is measured the numerical values recited of voltage signal 24a.If this value surpasses predetermined value, then give phase circuit 15 1 signals, so that produce the electric power that feeds back to power supply, that is: the block switch signal 25a of rectifier 2 delivers to phase circuit 15.Such speed control unit, if power line voltage is Vac, and the maximum output voltage of rectifier 2 is ED, then ED=1.35Vac(V when not considering the silicon controlled pressure drop).If power line voltage Vac descends for some reason, the output voltage of rectifier 2 also descends thereupon so, and at this moment, operational amplifier 24 improves the compensation of output voltage as loss in voltage.Yet when the voltage suppression ratio was big, the output voltage signal 24a of operational amplifier 24 was at t
1-t
2Time period in be in saturation conditions, as shown in Figure 3.And voltage instruction signal 12a is often greater than voltage signal 13a, and in other words, voltage instruction signal 12a can not always equate with output signal.In this case, if inverter 4 transfers the loopback state to from the transmission operation state, so, because the saturated meeting of operational amplifier 24 makes the operating delay of comparator 25, the voltage at cond 3 two ends will rise.Therefore, when power line voltage is low, be difficult to the electric current of control loopback direction, that is: excess current can flow in the loopback direction thyristor group.
This invention has at present overcome above-mentioned shortcoming.Device as a control elevator speed, it is equipped with piezoelectric detector and is used for detecting AC supply voltage, and minimum value is housed selects circuit to be used for the output indicator signal that the voltage signal of piezoelectric detector is used with the rectifier control rate is compared, produce one with than the identical signal of low value signal level as the output indicator signal after proofreading and correct, deliver to the comparator voltage control circuit, enter the phenomenon in the loopback direction rectifier Group of Silicon Controlled Rectifier to prevent excess current that the front was said.
Fig. 1, conventional apparatus for contrelling elevator speed block diagram;
Fig. 2, the detailed circuit diagram of speed control unit major part;
Fig. 3 illustrates the mode chart of speed control unit function;
Fig. 4 is by the concrete apparatus for contrelling elevator speed block diagram of being painted of installing of the present invention;
Fig. 5 illustrates the mode chart of said apparatus function;
Fig. 6, the detailed circuit diagram of said apparatus major part.
Fig. 4 is for specifically installing the block scheme of the apparatus for contrelling elevator speed structure of being painted according to the present invention.Among the figure those with Fig. 1 in the parts of identical number number TYP.Different is has increased by one and select circuit 27 in order to piezoelectric detector 26 and a minimum value of detecting AC supply voltage with Fig. 1 device, be used for receiving the voltage signal 26a of piezoelectric detector 26 and the output indicator signal 12a of speed control operation circuit 12, and compared, produce one than the signal of active potential as the output indicator signal after proofreading and correct, deliver to voltage control function circuit 14.
Fig. 6 is the detailed structure circuit diagram that piezoelectric detector 26 and minimum value are selected circuit 27.At first, piezoelectric detector 26 have abbreviate voltage transformer as below the three phase transformer 28(), the elementary termination source of AC of this voltage transformer, rectifying circuit of secondary termination, rectifying circuit comprises the diode (29-34) that 6 bridge-types connect, also comprise resistor 35 and cond 36, their output after to rectification strobes.Minimum value selects circuit 27 to have an operational amplifier 37, the positive input (+) of this amplifier receives the voltage signal 26a of piezoelectric detector 26, its reverse input end (-) is through an input resistor 38, the output indicator signal 12a of inbound pacing control operation circuit 12.Minimum value selects circuit 27 also to have diode 39, and it joins with the mouth of operational amplifier 37, and like this, operational amplifier 37 just can be worked when exporting indicator signal 12a effectively at voltage signal 26a.Above-mentioned selection circuit also is with buffer amplifier 40, and it receives the output of operational amplifier 37, and produces the output indicator signal 27a after proofreading and correct, and makes signal 27a be lower than the current potential of voltage signal 26a simultaneously.
The following explanation of saying to neoteric apparatus for contrelling elevator speed function mainly lays particular emphasis on this device characteristic different with Fig. 1 device.
At first, piezoelectric detector 26 detects the voltage of source of AC 1, produces the voltage signal 26a identical with exporting indicator signal 12a, delivers to the operational amplifier 37 in the minimum value selection circuit 27.If voltage signal 26a is greater than output indicator signal 12a, the output of operational amplifier 37 is then invalid owing to the effect of diode 39, output indicator signal 12a is equated with the output of buffer amplifier 40, and then output indicator signal 27a is also equated with output indicator signal 12a.
Secondly, because AC supply voltage descends when becoming less than output indicator signal 12a, and operational amplifier 37 is had an effect, output indicator signal 27a is limited on the current potential of voltage signal 26a of piezoelectric detector 26 as voltage signal 26a.
Like this, the output voltage signal 26a that minimum value selects circuit 27 to receive piezoelectric detector 26 imports as first, the output indicator signal 12a of inbound pacing control operation circuit 12 is as second input, and relatively two inputs produce a signal consistent with lower input.
Figure 5 shows that the relation between the output state of operational amplifier 24 in above-mentioned both and the voltage control function circuit 14.As long as voltage signal 26a keeps below output indicator signal 12a, output indicator signal 12a just is limited, and output indicator signal 27a will deliver to voltage control function circuit 14.Therefore, operational amplifier 24 can be unsaturated, and can find out significantly that by voltage signal 13a cond 3 two ends are keeping low voltage, thereby prevented that excess current from entering rectifier.
When the output voltage of rectifier 2 reduced, the output voltage of inverter 4 also can correspondingly reduce, from some distortion of sinusoidal waveform of inverter output, near rectangular wave.Yet this to controller characteristic curve without any substantial influence.
In apparatus for contrelling elevator speed of the present invention, when electrical motor was in the powered operation state, above-mentioned power rectifier was converted to direct current with source of AC and delivers to above-mentioned inverter; When electrical motor was in the loopback running state, this power converter was converted to the alternating current loopback with direct current and gives source of AC, and the power supply of electrical motor and loopback operation realize by a Group of Silicon Controlled Rectifier.
As can be seen, this invention at present can detect power line voltage from above-mentioned explanation, can be limited in the output indication on the low numerical value.Therefore, in service in loopback, can prevent very reliably that excess current from entering in the thyristor group of forming rectifier.
Claims (7)
1, apparatus for contrelling elevator speed comprises:
A power rectifier of being made up of thyristor converts AC supply voltage to direct current;
A cond, the DC current that above-mentioned power rectifier is exported strobes;
A power converter of being made up of aerotron and diode will be converted to the alternating current of voltage variable and changeable frequency through the vdc behind the above-mentioned capacitor filtering, supply with an alternating-current motor/AC motor and be used for driving the elevator cage;
A control circuit in order to more above-mentioned elevator car speed indicator signal and the speed through detecting, produces that an output indicator signal is delivered to above-mentioned power rectifier and a slip frequency indicator signal is delivered to above-mentioned power converter; Control the phase place of power rectifier according to exporting indicator signal, control the pulse width modulation of power converter according to the slip frequency signal; It is characterized in that:
Above-mentioned control circuit has a piezoelectric detector and detects AC supply voltage, the output signal that also has a minimum value to select circuit to receive piezoelectric detector is imported as first, receive above-mentioned output indicator signal as second input, both are compared, produce one with the signal of junior's same level wherein, control circuit selects this minimum value the output signal of circuit to be added to power rectifier to control its phase place as the output indicator signal after proofreading and correct.
2, according to the apparatus for contrelling elevator speed of right 1, wherein, control circuit also comprises:
A speed control circuit.It compares above-mentioned compartment rate indicative signal and the speed that detected, produces one and exports that indicator signal is delivered to power rectifier and a slip frequency indicator signal is added to power converter.
A voltage control circuit, it receives the output indicator signal of above-mentioned speed control circuit and represents the voltage signal of power rectifier output voltage, and both are compared, and produces a voltage signal and controls this power rectifier;
Above-mentioned minimum value selects circuit to be connected between above-mentioned speed control circuit and the above-mentioned voltage control circuit, and this minimum value selects the output signal of circuit to deliver to voltage control circuit;
3, according to the apparatus for contrelling elevator speed of right 1, wherein, when electrical motor was in the powered operation state, above-mentioned power rectifier was converted to DC current with source of AC and delivers to above-mentioned inverter; When electrical motor was in the loopback running state, this power converter was converted to the alternating current loopback with direct current and gives source of AC, and the power supply of electrical motor and loopback operation realize by a Group of Silicon Controlled Rectifier.
4, according to the apparatus for contrelling elevator speed of right 3, wherein, above-mentioned voltage control circuit comprises:
An operational amplifier receives the signal of being made up of the output voltage signal of above-mentioned output indicator signal and above-mentioned power rectifier, gives output signal of phase circuit and is used for the generator gate pulse, controls above-mentioned power rectifier;
A comparator, receive the output signal of aforesaid operations amplifier by its input end, and reception predetermined reference voltage, these two incoming signals are compared, produce an output signal and deliver to phase circuit, above-mentioned like this power rectifier is no matter at power supply or this both direction of loopback electric current, its Group of Silicon Controlled Rectifier all is in conducting state.
5, according to the apparatus for contrelling elevator speed of right 1, wherein, described piezoelectric detector comprises:
A voltage transformer, it is elementary to connect above-mentioned power supply;
A rectifying circuit connects the secondary of above-mentioned voltage transformer;
A filter circuit, the output of the flat above-mentioned rectifying circuit of filter produces one as the voltage output signal through detecting.
6, according to the apparatus for contrelling elevator speed of right 1, wherein, described minimum value selects circuit to comprise:
An operational amplifier receives the voltage signal of above-mentioned output indicator signal and above-mentioned piezoelectric detector;
An out amplifier, the output that produces above-mentioned amplifier is as the output indicator signal after proofreading and correct.
7, according to the apparatus for contrelling elevator speed of right 6, wherein, the positive input of described operational amplifier receives above-mentioned voltage signal, reverse input end receives the output indicator signal, the mouth of operational amplifier is connected on the negative pole of a diode, and the positive pole of this diode and above-mentioned out amplifier join.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101195 CN1011688B (en) | 1985-04-01 | 1985-04-01 | Speed control apparatus for elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101195 CN1011688B (en) | 1985-04-01 | 1985-04-01 | Speed control apparatus for elevator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101195A CN85101195A (en) | 1986-09-24 |
| CN1011688B true CN1011688B (en) | 1991-02-20 |
Family
ID=4791677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85101195 Expired CN1011688B (en) | 1985-04-01 | 1985-04-01 | Speed control apparatus for elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1011688B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4397721B2 (en) * | 2004-03-30 | 2010-01-13 | 三菱電機株式会社 | Elevator control device |
| JP4986541B2 (en) * | 2006-08-31 | 2012-07-25 | 東芝エレベータ株式会社 | Elevator control device |
| JP4960374B2 (en) * | 2006-10-19 | 2012-06-27 | 三菱電機株式会社 | Power converter |
-
1985
- 1985-04-01 CN CN 85101195 patent/CN1011688B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85101195A (en) | 1986-09-24 |
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