CN1006543B - Speed control apparatus for elevator - Google Patents
Speed control apparatus for elevatorInfo
- Publication number
- CN1006543B CN1006543B CN 85101333 CN85101333A CN1006543B CN 1006543 B CN1006543 B CN 1006543B CN 85101333 CN85101333 CN 85101333 CN 85101333 A CN85101333 A CN 85101333A CN 1006543 B CN1006543 B CN 1006543B
- Authority
- CN
- China
- Prior art keywords
- elevator
- value
- induction motor
- speed
- electric current
- 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.)
- Expired
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
- B66B1/28—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical
- B66B1/285—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration electrical with the use of a speed pattern generator
Abstract
The present invention relates to an elevator speed control device which has the structure that the time of an operation stage is output and limited by a prearranged current command value or a detector for detecting current supplied to an induction motor, so the load time factor of the induction motor has a preset value or a value less than the preset value, and the induction motor keeps the temperature increase value of the heat quantity generated on the basis of an induction motor winding at an allowed value or a value lower than the allowed value. In this way, the elevator speed control device prevents the induction motor from being burnt. Even though the induction motor operates under the state of low speed, for example, a manual operation state for installation, maintenance and inspection.
Description
The present invention relates to a kind of elevator speed control apparatus, specifically a kind of elevator speed control apparatus that prevents that machine winding from being burnt during low cruise.
Up to the present, in Official Journal " Japanese Patent Application Publication communique ", announce a kind of elevator speed control apparatus of correlation type, be numbered 56-123795, Figure 1 shows that the structured flowchart of this device.With reference to this figure, an elevator is to be made of following each several part, a rectifier 2, this rectifier is accepted input and is converted into DC current from source of AC 1, a filter capacitor 3, this electric capacity is to the output voltage filtering of rectifier 2, an inverter 4, this inverter comprises a crystal triode and a diode and will be reversed by the vdc of cond 3 filtering is the exchange current with variable voltage and variable frequency, an induction motor 5, this motor is driven by the alternating-current voltage/AC voltage of 4 inversions of inverter, a pulley 6, this pulley is driven by the rotation of induction motor 5, a hauling rope 7, this hauling rope is on pulley 6, and elevator cabin 8 is connected an end of hauling rope 7 and the other end that clump weight 9 is connected hauling rope 7.In this elevator, elevator speed control apparatus comprises a speed mode producer 11, this producer produces a speed command signal 11a, a current probe 12, this detector detects the electric current of supplying with induction motor 5, the speed detector of the rotative speed of a detection induction motor (IM) 5 or tachogenerator 13, a control signal generation circuit 14, this circuit compares and computing speed detector 13 and speed mode producer 11 output separately, a pulse width modulation (hereinafter with " PWM " expression) comparator 16, this comparator compares to produce a pulse width modulation order the corresponding output of control signal generation circuit 14 and current probe 12, and a base drive circuit 17, this circuit produces a signal strobe that the crystal triode that constitutes inverter 4 is controlled according to the pwm command of PWM comparator 16.
Here, the induction motor 5 that adopts usually is the self-ventilation type.Under the situation of elevator with its command speed operation, the gyrofrequency of induction motor 5 is very high, thereby has kept very high cooling effectiveness.On the contrary, carry out at elevator under the situation of low cruise, particularly install, maintenance, when manually moving under the analogues such as examinations, cooling effect is destroyed, lasting one when long-time when low cruise, can burn the winding of induction motor 5.
Pass between the resistance to heat R of desired ventilation rate Q of the cooling of induction motor 5 and induction motor 5 is as follows:
Q＝Qo（N/No） 〔1〕
The specified gyrofrequency of No motor wherein,
The gyrofrequency of N motor,
Ventilation rate during the specified rotating operation of Qo.
0.45～0.5
R＝Ro（Qo/Q） 〔2〕
The resistance to heat during the specified rotating operation of Ro wherein.
By in above-mentioned formula (1) and (2) as can be known, when gyrofrequency N descended, ventilation rate Q reduced, and then when ventilation rate Q reduces, resistance to heat R increase.In this manner, the reduction of gyrofrequency has increased thermoelectric resistance, causes the shortcoming of burning the Q machine winding.
For fear of this shortcoming, in the prior art time length of manual operation has been stipulated that a boundary overcomes the shortcoming of burning motor with this.Yet, adopt this measure, when the time that motor moves under heavily loaded situation has surpassed a predetermined value, still have the danger that machine winding is burnt takes place.
The present invention be directed to above-mentioned shortcoming finishes, and a kind of elevator speed control apparatus proposed, wherein induction motor its load hour factor (%Ed) when operation is maintained at a predetermined value, avoid burning induction motor thus, even if it is operated in lower-speed state, manual running state when maintenance and examination or other analogue for example is being installed.
Figure 1 shows that the elevator speed control apparatus of a routine;
Fig. 2 is the overall circuit figure that shows one embodiment of the invention;
Fig. 3 is a block diagram of the detailed construction of a critical component among Fig. 2;
Fig. 4 is a diagram of circuit of the device operation logic in the instruction diagram 2; And
Fig. 5 is the value I of operation in the displayed map 4, the graph of a relation of Ed and OH.
Now, referring to figs. 2 and 3 one embodiment of the invention are described.Fig. 2 has shown the overall circuit figure that the present embodiment is described with part with the form of square frame, and Fig. 3 is the block diagram of a critical component detailed structure among Fig. 2.In Fig. 2, the symbol identical with the overall circuit figure of device in the prior art shown in Figure 1 will be represented identical parts respectively.In figure, install as follows according to the elevator speed control apparatus of the present embodiment.The speed command signal 11a that is sent by speed mode producer 11 and all be applied on the control signal generation circuit 15 by the speed detection signal 13a that speed detector 13 sends, this circuit constitutes with micro controller system.According to the operation result of control signal generation circuit 15, a current controling signal 15a is applied on the inverter 4 by PWM comparator 16 and base drive circuit 17, adjusts the speed of the electric current of supply induction motor 5 with the control elevator thus.
Being constructed as follows of control signal generation circuit 15, speed command signal 11a is input to a center processing unit (following represent with CPU) 22 by an output translator (following represent with I/F) 18, and speed detection signal 13a then imports by an I/F19.Then, the data CPU22 according to RAM23 or ROM24 sends a current command value so that the load hour factor of induction motor 5 can maintain or be lower than a predetermined value.Current command value I converts an analog quantity by a D/A converter 25 to from a digital quantity, and analog quantity is exported.
CPU22 comprises a coefficient detector 221, this detector detects electric current-time product coefficient according to load hour factor (%Ed), a zero level comparator 222 compares electric current-time product coefficient and a zero level, a maximum level comparator 223 compares electric current-time product coefficient and a maximum level, and output unit 224, this device is according to producing a control signal corresponding to the comparator 222 of zero level and maximum level and 223 comparative result.This CPU22 maintains a predetermined value for the load hour factor with induction motor 5 or is lower than this value and produces a control signal, avoids burning the winding of induction motor 5 with this.
Or rather, flow through the electric current of induction motor 5 with I ' indication, the heat PW that is produced by the induction motor winding is represented as:
PW＝r·I
′2……〔3〕
Here, r represents the impedance of winding.On the other hand, corresponding to the heat PW of induction motor winding, the temperature value θ that motor temperature rises is represented as:
θ＝R·PW ……〔4〕
Here, the heat radiation resistance of R representative under manual state.
Therefore, but use θ max to represent the permissible value of induction motor thermal resistance maximum temperature, load hour factor (%Ed) is expressed as:
%Ed＝（θmax/R·PW）×100 〔5〕
In above formula (5), (RPW) expression induction motor 5 value that temperature rises under stabilized conditions.Therefore, with regard to load hour factor (%Ed), this factor be the value that rises of this temperature with the value θ max of permission between ratio, as long as this factor maintains or is lower than predetermined value, induction motor is in operation and just can not be burnt.
Below, with reference to Fig. 2,3 and 4 pairs of the present embodiment are illustrated.Fig. 4 shows CPU22, the diagram of circuit of job procedure among RAM23 and the ROM24 in the middle of the control signal generation circuit 15.
Step 25 and 26 is the work of electric current-time product coefficient shown in Figure 3 (following represent with Ed) detector 221.According to formula (3), step 25 will and be calculated by square value corresponding to current command value I square of speed control signal
2The heat PW that machine winding produced that product determined with winding resistance r.Step 26 is obtained the Ed value by following mode, obtain the generation heat PW that calculates by step 25 and generate difference between the heat PWO, this PWO be to induction motor 5 continuously under the situations of power supply winding temperature rise reach the desired generation heat of value θ max of permission, with this difference and heat radiation resistance R and sample time △ t product with respect to time quadrature score value.
Subsequently, the detection signal OH that provides as the operation result of CPU22 is provided step 27.When detection signal became OH=1, a danger signal was delivered to relay 21 through the I/F20 shown in Fig. 2, and the motion of relay 21 stops elevator.
Suppose that now manual operation begins, Ed is tried to achieve by step 25 and 26.Because OH=0 in this case, execution in step 28,30 and 32 function are kept HO=0 by As-Is and can be made the elevator operation.And then, when the operation of elevator continued one long-time and obey relational expression PW＞PWO, then Ed＞EDmax sets up.On the time point that Ed＞Edmax sets up, OH=1 is by operating procedure 30 and 31 and set up, and ceasing and desisting order sends to relay 21 through the I/F20 shown in Fig. 2, and the operation by 21 stops elevator immediately.
After elevator stopped, the current command value of exporting from CPU22 22 became zero.Correspondingly, the operation result of step 25 is PW=0, and is continued to descend with a fixed slope by the Ed that step 26 is calculated.When Ed descends, the state of elevator supposition OH=1, therefore, CPU22 sends to relay 21 according to the operation result process I/F20 continuation of step 34 and 35 and ceases and desist order.
Because the time further passes, when set up Ed≤0, detection signal was rendered as OH=0, and CPU22 no longer sends to relay 21 and ceases and desist order, and this relay 21 resets, and makes elevator return to running state thus.
Step 28 and 29 work are to be used to prevent that the value of Ed from continuing to descend between down period.
For above operational process is described, Figure 5 shows that a current command value I, the graph of a relation of Ed and OH.Relation shown in the figure is that the electric current of being accepted under the situation of elevator operation can make equation PW=3PWO set up.In figure, make the state that opens or closes that I represents current command value at time to, the state that current command value I falls into out, integrated value Ed increases gradually in this state.When Ed at time t
1Reach the Edmax value, OH=1 sets up, and current command value is from time t thus
1To time t
2The state that keeps the pass.When current command value I was in the state of pass, Ed reduced gradually and gets back to a predetermined value.At time t
2Ed has returned to predetermined value, and OH=0 sets up, the state that current command value enters out once more.By repeating the state of opening and closing of current command value I by this way, load hour factor can be maintained at or be lower than predetermined value.
Be appreciated that from Fig. 4 load hour factor (%Ed) is:
%Ed＝θmax/（R·P）
＝（R·PWO）/（R·3PWO）
＝
The present embodiment has arranged to finish so that give the predetermined value of load hour factor (%Ed) or less than this value to CPU received current controlling valu, another possible arrangement simultaneously comprises a current probe, this detector is used to test the current value of supplying with induction motor, according to the current detection signal of this current probe, the load hour factor of induction motor is maintained at predetermined numerical value.
The present embodiment arrangement finishes so that when giving load hour factor (%Ed) with predetermined value or less than this value, but also the installation rate control setup so that load hour factor (%Ed) is maintained predetermined numerical value.
Just as the above proposed, formation of the present invention is to want and can the time of operation phase be limited according to output or predetermined current command value of the current detector that detect the electric current of supplying with induction machine, gives thus predetermined value of load hour factor of induction machine or less than this value. The temperature rise value of the heat that correspondingly, produces based on the induction machine winding can be maintained at or be lower than the value of a permission. This effect of bringing is can carry out the manual operation of low speed and can not burn induction machine.
Claims (8)
1, a kind of elevator speed control apparatus, it has a speed mode producer, and this producer produces the speed command of elevator; A current probe is in order to detect the electric current of the induction motor of supplying with the traction elevator; A speed detector, in order to detect the rotative speed of induction motor, a pwm comparator, in order to the corresponding output to speed detector and speed mode producer compare computing and with the output of comparative result and current probe more relatively so that produce the pulse width modulation order of control induction motor speed; And control signal generation circuit, send control signal in order to give above-mentioned pwm comparator, so that, give load hour factor-individual predetermined value or it be worth less than this with this according to the time of export-restriction operation phase of above-mentioned current probe.
It is characterized in that: the coefficient detecting device, detect electric current-time product coefficient according to load hour factor (%Ed), the zero level discriminator, electric current-time product coefficient and zero level are compared, the maximum potential discriminator, electric current-time product coefficient and maximum potential are compared, and output unit, produce control signal according to the comparative result of the corresponding discriminator of zero level and maximum potential.
2, elevator speed control apparatus according to claim 1, wherein, the testing result that described coefficient detecting device receives described current probe detects electric current-time product coefficient as its input and according to this input.
3, elevator speed control apparatus according to claim 1, wherein, described coefficient detecting device detects electric current-time product coefficient according to the current command value of determining in advance on the basis of induction motor rated value.
4, elevator speed control apparatus according to claim 1, wherein, described coefficient detecting device calculates the heat that is generated by induction motor, and provides an integrated value according to institute's result calculated, and this value increases gradually at the elevator run duration and reduces gradually during elevator stops.
5, elevator speed control apparatus according to claim 1, wherein, the comparative result that produces at described zero level discriminator and described maximum potential discriminator of described output unit shows that the current time product coefficient provides the control signal that stops elevator when surpassing corresponding given potential value.
6, elevator speed control apparatus according to claim 5, wherein, in described output unit provides the period of the control signal that stops elevator, described zero level discriminator carries out the comparison of electric current-time product coefficient, when electric current-time, the product coefficient was less than zero level, described output unit no longer provided the control signal that stops elevator.
7, elevator speed control apparatus according to claim 1, wherein, when described output unit does not provide the control signal that stops elevator and remove the situation of extrinsic current-time product coefficient less than zero level, described zero level discriminator with electric current-time product coefficient as being equivalent to zero level and sending corresponding signal.
8, elevator speed control apparatus according to claim 1, wherein, described control signal generation circuit produces and sends control signal when elevator runs on the lower-speed state that is lower than command speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101333 CN1006543B (en) | 1985-04-01 | 1985-04-01 | Speed control apparatus for elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85101333 CN1006543B (en) | 1985-04-01 | 1985-04-01 | Speed control apparatus for elevator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101333A CN85101333A (en) | 1986-09-24 |
| CN1006543B true CN1006543B (en) | 1990-01-24 |
Family
ID=4791778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85101333 Expired CN1006543B (en) | 1985-04-01 | 1985-04-01 | Speed control apparatus for elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1006543B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100202709B1 (en) * | 1996-11-04 | 1999-06-15 | 이종수 | Apparatus and its method of driving elevator on power down |
| US7823705B2 (en) * | 2005-09-30 | 2010-11-02 | Mitsubishi Electric Corporation | Elevator apparatus control by measuring changes in a physical quantity other than temperature |
| CN100562475C (en) * | 2005-11-14 | 2009-11-25 | 三菱电机株式会社 | Elevator control gear |
| JP5201545B2 (en) * | 2007-07-04 | 2013-06-05 | 東芝エレベータ株式会社 | Elevator door control device |
| JP5446627B2 (en) * | 2009-09-08 | 2014-03-19 | 株式会社安川電機 | Elevator control device and control method thereof |
-
1985
- 1985-04-01 CN CN 85101333 patent/CN1006543B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85101333A (en) | 1986-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1042315C (en) | Device for controlling speed of elevator | |
| CN1224566C (en) | Elevator control device | |
| CN101360675B (en) | Control apparatus for elevator | |
| CN1083392C (en) | Method and device for controlling emergency operation of elevator system | |
| US5157228A (en) | Adjusting technique for a digital elevator drive system | |
| US4982816A (en) | Speed control system for elevators | |
| KR19980065633A (en) | Inverter abnormal operation prevention device of elevator | |
| KR20070088740A (en) | Elevator device | |
| CN1043976C (en) | Device for controlling electric vehicle | |
| US5229558A (en) | Control of an elevator hoisting motor during under voltage conditions in the main power source | |
| US5281774A (en) | Drive control unit for hydraulic elevator | |
| CN1006543B (en) | Speed control apparatus for elevator | |
| EP0896564A1 (en) | Procedure and apparatus for the deceleration of an elevator | |
| US4779708A (en) | Control device for an elevator | |
| JPH065995B2 (en) | Elevator speed control device | |
| JP2888671B2 (en) | Speed control device for elevator inverter | |
| JP2848605B2 (en) | Inverter motor speed control device | |
| KR20160043301A (en) | Over heat detector of motor | |
| US4776434A (en) | Method and apparatus for smoothly stopping an elevator car at a target floor | |
| JP2005041672A (en) | Device and method for controlling elevator | |
| JP2005187172A (en) | Speed control method and device of inverter for elevator | |
| JP2677804B2 (en) | How to start / stop the inverter | |
| KR900002066B1 (en) | Formula controlling velocity of elevator | |
| SU777784A2 (en) | Device for control of dc electric drive | |
| JPH0336177A (en) | Speed control device for elevator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |