CN201044406Y

CN201044406Y - Three-phase asynchronous motor with large variation ratio and electro-magnetic brake

Info

Publication number: CN201044406Y
Application number: CNU2007200175707U
Authority: CN
Inventors: 汪洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-19
Filing date: 2007-01-19
Publication date: 2008-04-02
Anticipated expiration: 2017-01-19

Abstract

Currently, the prior AC asynchronous motor basically has three modes of speed regulation, namely speed changing by pole variation, electromagnetic speed regulation and speed regulation by frequency variation. The common problem of the three modes of speed regulation is that: a top speed ratio can not be greater than one to twenty, a low speed torque is greater than a high speed rated torque by more than one and a half folds, and when a rotating speed is lower than 50 turns per minute, the service performance and efficiency of the prior motor are both really bad. The prior motor is hardly adequate to a load (a working machine) which demands a high speed of 1000-3000 turns per minute, a low speed of 15-50 turns per minute, the low speed torque greater than the high speed torque by a plurality of folds, a braking function both at the high speed and the lower speed, as well as a speed changing function. The utility model adopts a large speed ratio electromagnetic braking three-phase asynchronous motor proposal that a main motor outputs a high speed toque of 1000-3000 turns per minute and a low speed torque is coaxially outputted after the main motor shaft is connected with a speed reducer and an electromagnetic clutch, thereby meeting the requirements of the load (the working machine).

Description

Big gear ratio electromagnetic braking threephase asynchronous

Affiliated technical field:

The utility model belongs to new varieties of " middle-size and small-size threephase asynchronous " subseries, is one of power-equipment of electromechanical industries use.

Background technology:

AC asynchronous motor gear shift mode commonly used mainly contains three kinds at present:

The pole-changing threephase asynchronous:

It is to utilize the wiring that changes stator winding to change electromotor series, obtains two or more rotating speed thereby make motor overlap windings with a cover or two.Its maximum gear ratio is 1: 6.

The electromagnetic speed-adjusting threephase asynchronous:

It is a kind of interchange constant-torque stepless speed-regulating motor, form by drive motor, electromagnetic slip clutches, tachogenerator and control device, wherein motor is as dragging motive power, and electromagnetic slip clutches are as transmitter, with the output transmission of torque of motor to load.Its maximum gear ratio is 1: 10, maximum output torque≤drive motor torque, and mechanical property is very soft, and efficient is lower during low speed.

Frequency converter---three-phase alternating-current motor governing system

Form by frequency converter and three-phase alternating-current motor.Power frequency supply is all adjustable alternating current of frequency and voltage by the frequency converter inversion, supplies with motor and realizes stepless speed regulation.Though this system's governor control characteristics is better, overload capacity is poor, and cost is higher.Maximum gear ratio is 1: 20, but operation characteristic is very poor in this scope, and noise and vibration all can increase a lot.

The common problem that exists of above-mentioned three kinds of motor is: the maximum (top) speed ratio is difficult to greater than more than 1: 30, and when low cruise, efficient is low, power consumption is big, and operation characteristic is very poor, and the low speed torque of motor is relevant with the high speed electric acc power, is generally less than its nominal torque.

Summary of the invention:

The purpose of this utility model is: design three asynchronous motors of a kind of big gear ratio electromagnetic braking, has 1: 50 above rotating speed pen, the power of low speed torque and high speed drive motor is irrelevant, and the high, low speed running all has efficient height, characteristics that operation characteristic is good.

During the technical solution of the utility model, three asynchronous motors of described big gear ratio electromagnetic braking are by secondary motor 2, worm reducer 1, and electromagnetic clutch 3, connecting flange 4, main motor 5 is formed.When running up, electromagnetic clutch 3 is in off-state, main motor 5 energising runnings, and outage stops, and in the time of outage, electromagnetic clutch 3 momentary connections are by the self-locking action braking of worm reducer.During low-speed running, main motor 5 is in off-state, secondary motor 2, and electromagnetic clutch 3 is connected, and secondary motor 2 connects worm reducer 1, and electromagnetic clutch 3, connecting flange 4 are by the axle output low speed torque of main motor 5.Low speed torque is only relevant with the moment of friction of secondary motor, worm reducer and clutch, thereby can obtain big gear ratio 1: 30～100 and high low speed torque.The mutually noninterfere in the running of major and minor motor is all worked under its rated condition, so no matter at a high speed or low speed fabulous service performance and high efficient are all arranged.

Description of drawings:

Accompanying drawing is big gear ratio threephase asynchronous structure principle chart

Sequence number content: 1 worm screw speed changer, 2 secondary motor 3 electromagnetic clutchs

4 coupling flanges, 5 main motors

Embodiment:

Major and minor motor is all selected the efficient height for use, starting, Y series and YS series threephase asynchronous that behavior in service is good, and needed specification requirement was selected when the power of main motor, rotating speed ran up according to load.The moment of frictions of the bearing capacity of secondary power of electric motor, rotating speed, worm reducer, rotation ratio, clutch etc., required correlation technique requires to select during with the low speed load operation.Secondary motor high speed shaft direct and worm reducer links, the slow-speed shaft of worm reducer and electromagnetic clutch input link, and the electromagnetic clutch output links to each other with the main motor axle by connecting flange can form a big gear ratio electromagnetic braking threephase asynchronous.

Embodiment: according to the utility model of accompanying drawing and said structure, main motor power 3KW, rotating speed 1440rpm, nominal torque is 20N.M, low speed torque 50N.M, rotating speed 18rpm, select the DLM4-10 electromagnetic clutch for use, the secondary motor of the worm reducer of rotating ratio i=80 and 0.18kw.

Claims

1. big gear ratio electromagnetic braking threephase asynchronous, form by main motor, secondary motor, worm reducer, electromagnetic clutch and coupling flange, it is characterized in that: the output shaft of worm reducer, electromagnetic clutch, main motor is installed on the same axis, electromagnetic clutch is the energising combination, the instantaneous energising braking of electromagnetic clutch during disconnection.