CN2353710Y

CN2353710Y - Alternative-frequency speed-regulation elevator

Info

Publication number: CN2353710Y
Application number: CN 99201279
Authority: CN
Inventors: 缪步升; 张玉平; 隋书杰; 吕德齐; 崔桂花
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-02-03
Filing date: 1999-02-03
Publication date: 1999-12-15
Anticipated expiration: 2009-02-03

Abstract

The utility model relates to a novel frequency conversion speed-regulation elevator, which is composed of a PLC, a frequency converter, a motor, a rotary encoder and a cage of lift. The three-phase rectification bridge of the frequency converter, an inverter and the motor are orderly connected together; the inverter, a PWM controller, a current controller, a speed position controller and the PLC are orderly connected together; the motor, the rotary encoder and the speed position controller are orderly connected together; the current controller is connected with the motor. The utility model has the advantages of homogeneous speed regulation, small starting current, high power factor, simple structure and high reliability.

Description

Novel frequency control elevator

The utility model relates to a kind of elevator, particularly a kind of novel frequency control elevator.

Frequency control elevator of the prior art has the following disadvantages.

1. the retaining segment existence is creeped, and sense of acceleration is arranged, and influences operating efficiency.

2. langding accuracy is relatively poor.

3. when heavy duty or light running, easily the car phenomenon is drawn and is slipped in generation.

The purpose of this utility model is to design a kind of novel frequency control elevator in order to overcome the deficiencies in the prior art.

The utility model is realized as follows: described elevator comprises PLC (programmable controller), frequency converter, motor, rotary encoder, car, it is characterized in that: frequency converter is made up of three-phase commutation bridge, inverter, PWM controller, current controller and velocity location controller, wherein, three-phase commutation bridge, inverter, motor link successively; Inverter, PWM controller, current controller, velocity location controller, PLC link successively; Motor, rotary encoder, velocity location controller link successively, and current controller and motor link.The three-phase main-frequency alternating current enters inverter behind three phase rectifier sedan-chair rectifying and wave-filtering, under each controller control, inversion is frequency and all adjustable three plase alternating current of voltage in inverter, be used for drive motor, in the use, car is with the outgoing call signal, in select signal, the stop signal, the on-off signal of door etc. is sent into PLC, through running software, provide corresponding acknowledge signal, to starting wherein again, fast, signals such as parking are sent into the velocity location controller, the velocity location controller will access corresponding speed command curve and send into current controller and PWM controller, described controller is according to the speed command curve, the switching frequency of insulated transistor and ON time in the control inverter, with the outgoing current of acquisition different frequency and voltage, thereby realization is to the control of elevator speed.The utility model has the advantages that:

1., evenly change frequency and voltage, realized the elevator speed smooth adjustment, obtained good ride comfort sense to the motor power supply by frequency converter;

2., the electric motor starting electric current is little, is no more than rated current, realized requirements of saving energy;

3., power factor higher (approximating 1);

4., simple in structure, it is few that system forms main part, integrated level height, good reliability;

5., the parking of realization elevator zero-speed, directly stop are creeped in cancellation.

Below in conjunction with accompanying drawing to this practical being described further

Fig. 1 is that elevator is formed block scheme

Fig. 2 is that velocity curve forms circuit diagram

Among Fig. 1, three-phase commutation bridge, inverter, motor link successively; Inverter, PWM controller, current controller, velocity location controller, PLC link successively; Motor, rotary encoder, velocity location controller link successively, and current controller and motor link.

Velocity location controller among Fig. 1 forms circuit by velocity curve shown in Figure 2 and constitutes, among the figure:

1. amplifier U3 and C2, W5, R14, R16 form voltage follower circuit, wherein, C2 is parallel to end of oppisite phase and the mouth of U3, W5 links to each other with the mouth of U3, R14 links to each other with the end of oppisite phase of U3 with R16, the end of oppisite phase of U3 links to each other with the adjustment end of W15 by R16, and this circuit plays the buffer action to input and feedback signal;

2. U5 and R23, R27, R44 form comparator circuit, R23 is parallel to end of oppisite phase and the mouth of U3, R27 is the output resistance of U5, the end of R44 links to each other with the in-phase end of U5, the other end inserts zero level, this circuit compares prime input and back level integral feedback signal, makes it obtain deamplification output;

3. U6 and C4, R35, R31 form an integrating circuit, and C4 is parallel to end of oppisite phase and the mouth of U6, and R3 is connected in series with the end of oppisite phase of U6 and the adjustment end of W6, the end of R35 links to each other with the in-phase end of U6, the other end inserts zero level, and when input end was linear signal, it was output as a steady state value;

4. U7 and C5, R32, R36 form the quadratic integral circuit, and C5 is parallel to end of oppisite phase and the mouth of U7, and R32 is series at the end of oppisite phase of U7 and the adjustment end of W7, the in-phase end of R36 one termination U7, and the other end links to each other with zero level.

5. U4 and R17, R19, R20 form differential circuit, R19 is parallel to end of oppisite phase and the mouth of U4, and R17 links to each other with the end of oppisite phase of U4, and R20 one end links to each other with the in-phase end of U4, the other end links to each other with zero level, and this circuit makes starting spot speed curve carry out the transition to acceleration by zero.

6. U8 and C7, R38, R40, R43 form filter circuit, and C7 and R40 all are parallel to end of oppisite phase and the mouth of U8, R38 links to each other with the end of oppisite phase of U8, R43 one end links to each other with the in-phase end of U8, and the other end links to each other with zero level, and this circuit makes the flex point slyness of velocity curve.

Claims

1, the whole elevator of a kind of novel frequency conversion, described elevator comprises PCL (programmable controller), frequency converter, motor, rotary encoder, car, be characterised in that: frequency converter is made up of three-phase commutation bridge, inverter, PWM controller, current controller and velocity location controller, wherein, three-phase commutation bridge, inverter, motor link successively; Inverter, PWM controller, current controller, velocity location controller, PLC link successively; Motor, rotary encoder, velocity location controller link successively, and current controller and motor link.

2, novel frequency control elevator according to claim 1 is characterised in that:

1. amplifier U3 and C2, W5, R14, R16 form voltage follower circuit, and wherein, C2 is parallel to end of oppisite phase and the mouth of U3, and W5 links to each other with the mouth of U3, and R14 links to each other with the end of oppisite phase of U3 with R16, and the end of oppisite phase of U3 links by the adjustment end of R16 and W5;

2. U5 and R23, R27, R44 form comparator circuit, and R23 is parallel to end of oppisite phase and the mouth of U3, and R27 is the output resistance of U5, and the end of R44 links to each other with the in-phase end of U5, and the other end inserts zero level;

3. U6 and C4, R35, R31 form an integrating circuit, and C4 is parallel to end of oppisite phase and the mouth of U6, and R3 is connected in series with the end of oppisite phase of U6 and the adjustment end of W6, and the end of R35 links to each other with the in-phase end of U6, and the other end inserts zero level;

4. U7 and C5, R32, R36 form the quadratic integral circuit, and C5 is parallel to end of oppisite phase and the mouth of U7, and R32 is series at the end of oppisite phase of U7 and the adjustment end of W7, the in-phase end of R36 one termination U7, and the other end links to each other with zero level;

5. U4 and R17, R19, R20 form differential circuit, and R19 is parallel to end of oppisite phase and the mouth of U4, and R17 links to each other with the end of oppisite phase of U4, and the in-phase end of R20 one end and U4 links, and the other end links to each other with zero level;

6. U8 and C7, R38, R40, R43 form filter circuit, and C7 and R40 all are parallel to end of oppisite phase and the mouth of U8, and R38 links to each other with the end of oppisite phase of U8, and R43 one end links to each other with the in-phase end of U8, and the other end links to each other with zero level.