CN2113566U - Fully digital control power pulling device - Google Patents

Abstract

The utility model relates to a fully digital control power pulling device, which belongs to the technical field of the generative power machine and is used for various mechanical power sources, particularly applied to a system which needs to control to the output revolution rate, the motional direction, the torsion and the distance of run. The utility model comprises a stator, a stator coil, a rotor and a rotor bearing. The utility model is characterized in that the outer edge of the rotor is provided with a rare-earth permanent magnetic material, and a guard ring is arranged at the outer edge of the rare-earth permanent magnetic material; the outer part of the stator coil is connected with a variable frequency inverter, and also is provided with a programmable controller which can control the variable frequency inverter and can share with other devices. The output revolution rate, the motional direction, the torsion and the distance of run of the utility model can be controlled with using digital.

Description

Fully digital control power pulling device

A kind of fully numerical-controlled electric towing, it belongs to motility mechanical, is used to do the power source of various machineries, is specially adapted to the system that need control output speed, the direction of motion, moment of torsion and stroke.Power source as hoisting machinery, transportation, trolley bus and various blower fan and liquid pump.It belongs to motor type.

Present existing motor mainly contains induction motor and exciting motor two big classes.The foundation of induction motor rotor field is the electric current generation by the stator field rotary inductive, and the rotor field of exciting motor is to produce or use the permanent magnetic material generation by extrinsic current.The induction motor operation principle is simple, and is easily manufactured, is widely adopted.But present existing induction motor all is immutable operating mode, and its projected working point narrow range, and when departing from this scope, the operating efficiency of motor reduces greatly, so when the bigger occasion of power condition changing was used, energy dissipation was bigger.Also very difficult to the active regulating working conditions.It is very difficult particularly requiring the output speed and the moment of torsion of control motor.Use the motor of extrinsic current excitation, can be by regulating the extrinsic current size, therefore the operating mode of active adjustment motor is adapted to variable working condition (a lot of direct current machines come to this work).Now externally the size of current method of regulating is to use the external resistance case to become resistance (as trolley bus etc.).Because resistance box will consume certain energy, produce decrease in efficiency, but also will solve the heat dissipation problem of external resistance case, the volume of external resistance case is also very huge.The more important thing is that use to change the method for exciting current, though can regulate the power condition of motor, its output speed is relevant with load, change with the change of load, thus very low to the control precision of rotating speed.Owing to must use brush (no matter being annular brush or commutating brush) when powering to rotor with extrinsic current, like this, problem on the one hand is that the wearing and tearing of brush require frequent maintenance and replacement; On the other hand, brush contact is also unreliable, is easy to generate electric spark etc., and this explosion-proof when using motor under specific condition is very disadvantageous.In addition, brush also is this class motor easy out of order place in service.Present plant equipment all to the electromechanical integration development, uses a computer and measures and control.And above-mentioned said motor all is not directly numerical control.

The utility model purpose provides a kind of fully numerical-controlled electric towing, and it comprises electric power operating part and digital control part.Structural principle is simple, and higher efficient is arranged, and can directly use digital controlly, is suitable for various variable working condition occasions and uses.Be used to do the power source of various machineries, be specially adapted to the system that need control output speed, the direction of motion, moment of torsion and stroke.

Structure of the present utility model as shown in Figure 1, it comprises stator 1, stator coil 2, rotor 3, rotor bearing 4 is characterized in that: in rotor 3 outer rims rare earth material permanent magnet 5 is arranged, be surrounded by retaining ring 6 outside rare earth material permanent magnet 5, be circumscribed with variable ratio frequency changer inverter 7 at stator coil 2,7 that control, and the Programmable Logic Controller 8 that can be total with miscellaneous equipment of pair variable ratio frequency changer inverter is arranged.

By stator 1, stator coil 2, rotor 3 and rotor bearing 4 have been formed electric power of the present utility model and machine power conversion portion.Because rotor 3 outer rims are fixed with rare earth material permanent magnet 5, make rotor 3 become p-m rotor.When feeding alternating current among stator coil 2, alternating current produces 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 velocity of rotation of rotor is identical with the rotating magnetic field rotary speed that alternating current produces, thereby electric power is identical with the effect and the synchronous motor of machine power conversion portion.The utility model uses variable ratio frequency changer inverter 7 to give stator coil 2 power supplies, variable ratio frequency changer inverter 7 becomes frequency and all variable alternating current output of phase place to common fixed alternating current frequently or direct current, it not only can controlled change output current frequency and phase relation, size that can also controlled change output current.Output current frequency by control break variable ratio frequency changer inverter 7 and phase relation are with regard to the output velocity of rotation and the rotation direction of may command rotor 3, output current size by control break variable ratio frequency changer inverter 7 can also be regulated the output torque of rotor 3, thereby controls its operating mode.Variable ratio frequency changer inverter 7 of the present invention has been controlled output speed of the present utility model, the direction of motion and moment of torsion by Programmable Logic Controller 8 controls by numerically controlled method.Owing to used Programmable Logic Controller 8 to control, carried out integration by 8 pairs of controlled variable ratio frequency changer inverter 7 output current frequencies of Programmable Logic Controller, thereby obtain control to stroke.

Rotor 3 outer rims in the utility model have rare earth material permanent magnet 5, are surrounded by retaining ring 6 outside rare earth material permanent magnet 5, and rare earth material permanent magnet 5 can be to be divided into several piece, and are fixing respectively.Also can be annular, be enclosed within outside the rotor 3.Be surrounded by retaining ring 6 outside rare earth material permanent magnet 5, retaining ring 6 should use the manufacturing of high strength paramagnetic material, as carbon fiber or fiberglass reinforced plastics, stainless steel etc.Can adopt winding method, after rare earth material permanent magnet 5 is fixed, again retaining ring 6 is fastened outside rare earth material permanent magnet 5.Also can be processed into tubular to retaining ring 6 earlier, be enclosed within outside the rare earth material permanent magnet 5.The effect of retaining ring 6 is an intensity of strengthening rotor, makes it the active force that bear rotor 3 high speed rotating produce.Rotor 3 uses ferrimagnets (as silicon steel sheet, glass not alloy or pure iron) to make, and is beneficial to magnetic conduction, and the magnetic field intensity that rare earth material permanent magnet 5 is formed is higher.Because rare earth material permanent magnet 5 has higher magnetic energy product, thereby can be so that the volume of rotor 3 is less, starting torque is bigger.

The utility model uses Programmable Logic Controller 8 that its output speed, the direction of motion, moment of torsion and movement travel are controlled, and situation and output that Programmable Logic Controller 8 was worked at that time according to the utility model require to provide control variable ratio frequency changer inverter 7 control signals.The control strategy of Programmable Logic Controller 8 and requirement can exist in its memory, also can use other upper strata control computer to require the digital quantity of setting for Programmable Logic Controller 8 inputs, provide corresponding variable ratio frequency changer inverter 7 control signals according to working condition by Programmable Logic Controller 8 by the standard serial communication interface.

The utility model uses by stator, stator coil, the conversion that electric power of the present utility model that rotor and rotor bearing are formed and machine power conversion portion are only finished electric power and mechanical force, the control section of being made up of variable ratio frequency changer inverter and Programmable Logic Controller is finished the control to output speed of the present utility model, the direction of motion, moment of torsion and movement travel.Because Programmable Logic Controller uses digital quantity to control, thereby the utility model is total control.Rotor uses permanent-magnet structure, can use any brush, and wearing and tearing do not produce any dust yet, particularly can not produce electric spark, therefore can be used in the occasion of requirement of explosion proof.

The used adjustable inverter 7 of the utility model can use as the patent No. and be CN90202757 and the patent No. patent as CN90203323, also can use the G7 series inverter of Japanese fuji company, and the utility model does not have specific (special) requirements.Programmable Logic Controller 8 in the utility model can be the general industry process controller, it also can be industrial control computer, even can be and other control section or the total central control computer of other oil well, by standard industrial control, use and divide the method for time-division location that each transducer and controlling organization are measured and controlled.

Claims (1)

1, a kind of fully numerical-controlled electric towing, it comprises stator 1, stator coil 2, rotor 3, rotor bearing 4 is characterized in that: in rotor 3 outer rims rare earth material permanent magnet 5 is arranged, be surrounded by retaining ring 6 outside rare earth material permanent magnet 5, be circumscribed with variable ratio frequency changer inverter 7 at stator coil 2,7 that control, and the Programmable Logic Controller 8 that can be total with miscellaneous equipment of pair variable ratio frequency changer inverter is arranged.

Images