CN1078581A - Numeral-control electric hauling device that can recuperated energy - Google Patents

Abstract

A kind of numeral-control electric hauling device that can recuperated energy is specially adapted to do the power source relevant with lifting.It includes the rotor of being made magnetic pole by stator, stator coil and rare earth permanent-magnetic material, by the variable ratio frequency changer inverter to the stator coil feed, pair variable ratio frequency changer inverter is arranged, and the high-power electric and electronic switch module controls, and Programmable Logic Controller that can be total with other equipment.When impulse stroke, can be to its rotating speed, turn to, moment of torsion, stroke carry out data; When its reverse drive, available numerical control method becomes the potential energy converting and energy that stores in the course of work direct current to drag DC load, perhaps converts alternating current to and presents back power supply network.

Description

Numeral-control electric hauling device that can recuperated energy

The present invention relates to a kind of fully numerical-controlled electric towing, particularly a kind of numeral-control electric hauling device that can recuperated energy in the inverse process of its motion belongs to motor and Drag Control field thereof.

Existing motor mainly is divided into induction motor and exciting motor two big classes.The former operation principle is simple, easily manufactured, is widely used in the industrial industry-by-industry.Latter's complex structure, maintenance are big, though can suitably regulate its running operating mode, control precision is low, and load characteristic is soft.The both can not directly adopt digital control.For this reason, the applicant developed a kind of structural principle simple, greater efficiency is arranged, can directly adopt digital controlly again, be particularly suitable for the fully numerical-controlled electric towing (number of patent application CN92100001.4) that various variable working condition occasions are used.This device can carry out real-time numerical control to five kinematic parameters such as the speed that drags object, acceleration, direction, moment of torsion, strokes, can be as the power source of various machineries.But, in some devices relevant with lifting, in its course of work, install sometimes when from electric current, obtaining energy acting (that is: sling weight), its energy of importing has quite a few mode with potential energy to be stored in the mechanical moving element of device to have gone, and this process can be called thermal energy storage process; And in its inverse process (promptly unloading weight), this a part of energy stored does not obtain reasonable and effective use well, has usually consumed in vain.In traditional conventional equipment, normally utilize a cover brake system device, utilize the mechanical friction method that the potential energy converting and energy that stores is become heat energy, again by air heat exchange, this part energy is consumed away from device.This conventional method, extremely unreasonable from energy-conservation viewpoint, and also the brake apparatus condition of work is abominable, very easily wearing and tearing, and maintenance workload is big.

The objective of the invention is on the basis of original invention, to be improved and design a kind of numeral-control electric hauling device that can recuperated energy.

Structure of the present invention as shown in Figure 1, it includes by stator 1, stator coil 2, rotor 3, electric machine and numerical control device that rotor bearing 4 is formed, it is characterized in that: the magnetic pole of making at the useful rare earth permanent-magnetic material of the outer rim of rotor 35, be surrounded by retaining ring 6 in the periphery of magnetic pole 5, be circumscribed with variable ratio frequency changer inverter 7 at stator coil 2, this inverter 7 also joins with DC load 11 by a high-power electric and electronic switch module 9 and filtering capacitor group 10, pair variable ratio frequency changer inverter 7 is arranged, power electronic switch assembly 9 is controlled, and Programmable Logic Controller 8 that can be total with other equipment.

Accompanying drawing 2 has shown the sectional structure schematic diagram of motor part.

The present invention has been made of the power switching device of electric energy and mechanical energy stator 1, stator coil 2, rotor 3 and rotor bearing 4, its action principle is identical with synchronous machine: because the rotor outer rim is fixed with the magnetic pole 5 that rare earth permanent-magnetic material is made, make rotor 3 become p-m rotor.When feed-in alternating current in stator coil 2, this electric current can produce a rotating magnetic field, and the permanent magnetic field of this rotating magnetic field and rotor interacts, thereby drives rotor 3 rotations, produces output torque.The rotary speed of rotor is identical with the rotary speed that alternating current produces.The present invention uses variable ratio frequency changer inverter 7 to give stator coil 2 feeds, variable ratio frequency changer inverter 7 becomes frequency and all variable alternating current output of phase place to common industrial-frequency alternating current or direct current, it not only can controlled change output current frequency and phase relation, size that also can controlled change output current.Output current frequency and phase place by control break variable ratio frequency changer inverter 7, velocity of rotation, acceleration and rotation direction with regard to may command rotor 3, output current size by control break variable ratio frequency changer inverter 7, can regulate the output torque of rotor 3, also can be by the output current of Programmable Logic Controller 8 to its variable ratio frequency changer inverter of controlling 7, frequency is carried out integration, realizes the control to stroke.In a word, can be by numerically controlled method, nationality helps Programmable Logic Controller 8 pairs of output speeds of the present invention, acceleration, the direction of motion, moment of torsion and strokes all to realize accurate control in real time.When the present invention is used for hoisting machinery, lift in the impulse stroke of weight at it, the present invention can utilize Programmable Logic Controller basis operating mode at that time and export requirement as above-mentioned, and the variable ratio frequency changer inverter is sent control signal, and rotating speed, acceleration, the direction of motion, moment of torsion and stroke are controlled; And in the inverse process that unloads the weight load, just device discharges in the process of potential energy, understands some potential energy converting and energy and becomes mechanical energy and convert three-phase alternating current to by motor.In other words, in inverse process,, be to be in the work of typical synchronous generator state, thereby in its power line, have three-phase alternating current output by mechanical energy and the device for converting electric energy that stator, stator coil, rotor and rotor bearing constitute.This three-phase alternating current enters in the adjustable frequency inverter power 7, convert direct current to by its inner three phase full wave rectification axle assemble rectification, again through a high-power electric and electronic switch module 9 and filtering capacitor group 10, just can be fed to a direct current power consumption load 11 and get on to export work done, this DC load can be determined it as the case may be.The effect of high-power electric and electronic switch module 9 is: it is in cut-off state in the course of the work in the present invention, makes device thereafter all be in off state, does not influence operate as normal of the present invention; Have only in the reverse process, it just is in conducting state, and the alternating current that makes motor partly produce can be to auxiliary DC load feed.The three-phase alternating current that motor produces is converted into after the direct current, also can by adjustable frequency inverter power 7 inside become three-phase alternating current with the synchronous DC-AC inverter another mistake of three-phase alternating current electrical network, present back power supply grid.These processes all by Programmable Logic Controller 8 send that command adapted thereto is coordinated, balanced and control relevant apparatus action and finishing.And the control strategy of Programmable Logic Controller 8 and requirement can be pre-stored in its memory, also can use other upper strata control computers to give the Programmable Logic Controller various digital commands that 8 inputs adhere to specification by serial communication interface, again by Programmable Logic Controller 8 according to working condition requirement, to variable ratio frequency changer inverter 7, power electronic switch assembly 9 provides corresponding control signal, finishes the operation operation of electric drive of the recoverable energy of total control.

The magnetic pole 5 that rare earth permanent-magnetic material among the present invention is made can be divided into several piece, fixing respectively; Also can be the integral body of annular.The retaining ring 6 of magnetic pole 5 peripheral parcels is used the manufacturing of high strength paramagnetic material, makes rotor can bear the active force that high speed rotating produces.Rotor adopts ferrimagnet (as ore deposit steel disc, glass alloy etc. not) to make, in order to magnetic conduction.

The present invention again through motor and corresponding control device, converts the potential energy that has accumulated the acting of to direct current or alternating current in the inverse process of normal externally acting, both avoided the unnecessary consumption of energy, with the aggravation wearing and tearing of mechanical part, improved the service efficiency of energy again, reduce maintenance workload.

Used adjustable frequency inverter power 7 can be used the patent of the patent No. as CN90202757 or CN90203323 among the present invention, also can use the G7 series inverter of Japanese fuji company, and the present invention does not have specific (special) requirements.Programmable Logic Controller 8 can be the general industry process controller, it also can be industrial control computer, can also be and other control systems or the common central control computer of other equipment, by standard industrial control, use and divide the method for time-division location that each transducer and controlling organization are carried out data acquisition and control.

Claims (1)

1. A kind of numeral-control electric hauling device that can recuperated energy, include by stator 1, stator coil 2, rotor 3, electric machine and numerical control device that rotor bearing 4 is formed, it is characterized in that: the magnetic pole of making at the useful rare earth permanent-magnetic material of the outer rim of rotor 35, be surrounded by retaining ring 6 in the periphery of magnetic pole 5, be circumscribed with variable ratio frequency changer inverter 7 at stator coil 2, this inverter 7 also joins with DC load 11 by a high-power electric and electronic switch module 9 and filtering capacitor group 10, pair variable ratio frequency changer inverter 7 is arranged, power electronic switch assembly 9 is controlled, and Programmable Logic Controller 8 that can be total with other equipment.

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