A common faults and elimination method of induction motor

1) the motor can't start motor starting,ringing or low speed,this is the most common fault.Its reason is: power disconnection or blown fuse,switch starting equipment or a poor contact or broken line in the stator coil;Or because of lag in the brush brush card,no contact with the slip ring;Stator

voltage is too low or excessive load on the permanent magnet generator reason leads

to the failure.Processing methods available voltmeter to check voltage of the motor,such as a phase power lines to check the power supply of power,insurance,switch and starting equipment contact,repair or update processing respectively.If starting rheostat is damaged,can be used to check the lamp or shaking table test,find out the fault wholesalemotor.blogspot.com repair;If it is found that the load is too big,should reduce or change the capacity of the larger motor.(2) motor

overheating causes overload or stator terminal voltage is too high,too low,poor ventilation,may also have a bolt stator coil,etc.Measures should be taken,such as reducing load,to adjust the mechanical and electrical pressure rating,remove the body ventilation slot dirties dustiness,bolt repair.(3) the spark to appear on the slide Reason is lack of the pressure on the slip ring or carbon brush and slip ring dirt,etc.,can be used sand paper to grind is good,with the cleaning brush frame,make the carbon brush block,adjust the spring pressure;Also can use clean cloth dipped in a small amount of

gasoline,cleaning brush.If spark acmotortrading.blogspot.com for slip ring is not round,can take fine car slip ring polishing.

(4) motor violent vibration Reason to install more bad,basic not firm,foot screw is not tight;The individual may also be due to rotor copper bar tensile fracture or short circuit ring.Find out that the former should be correct,which can replace the new copper,the fracture of the available copper weld repair.Sometimes because the rotational part touching the fixed place.Should check the shaft wear and clearance of the stator and rotor,take the fine car rotor or replacement of wearing parts.(5) motor no-load current balance,but value is big 1.The cause of the problem (1) to repair,the stator winding turns to reduce too much;(2) power supply voltage is too high;(3) Y after motor misconnection Δ;(4) in the motor assembly,rotor installed backwards,motor lamination making the stator core unaligned,effective length cut short;(5) the air gap is too large or uneven;6 overhaul when the demolition of the old winding,using hot tear open method is undeserved,make the iron core loss.2.The troubleshooting (1) rewind stator winding,restore the correct number of turns;(2) managed to restore rated voltage;(3) to connect to Y;(4) to assembly;(3) to replace the new rotor or adjust the air gap;(5) maintenance core or

recalculate winding,appropriately increase the number of turns.

Delta connection of the motor and the difference between y connection

Under the small motor (4 kw) most using Y type connection, large motor usually adopt delta connection, star triangle decompression can also be used as a large motor starting, motor spare parts when starting torque motor coil Y type runtime is only half of the delta connection, but the current is only starting about a third of the triangle. Triangle when starting current is rated current of 4 to 7 times, but the torque is big. Speed is the same, but different torque For ordinary three-phase electricity, the phase voltage 220 v, line voltage 380 v. Y connection is three-phase power electricalmotor1.blogspot.com to one end of acmotortrading.blogspot.com each winding, the other three phase asynchronous motor end connect together. That each winding can gain phase voltage of 220 v. Delta connection is each winding end to end in order to form a triangle, three phase electricity in the Angle of the triangle. That each winding can gain line voltage of 380 v. If the phase voltage is 220 v, the rating of the motor is in y connection. If it is 380 v with delta connection. In particular, if the motor is belong to the rated voltage 380 v, you can use 220 v y connection step-down start, start to finish to switch to the delta connection

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Success with DC motors

The first commutator DC electric motor capable of turning machinery was invented by the British scientist William Sturgeon in 1832.[12] Following Sturgeon's work, a commutator-type direct-current electric motor made with the intention of commercial use was built by the American inventor Thomas Davenport, which he patented in 1837. The motors ran at up to 600 revolutions per minute, and powered machine tools and a printing press.[13] Due to the high cost of primary battery power, the motors electric motor were commercially unsuccessful and Davenport went bankrupt. Several inventors followed Sturgeon in the development of DC motors but all encountered the same battery power cost issues. No electricity distribution had been developed at the time. Like Sturgeon's motor, there was no practical commercial market for these motors.

In 1855, Jedlik built a device using similar principles to those used in his electromagnetic self-rotors that was capable of useful work.[5][11] He built a model electric vehicle that same year.The first commercially successful DC motors followed the invention by Zénobe Gramme who had in 1871 developed the anchor ring dynamo which solved the double-T armature pulsating DC problem. In 1873, Gramme found that this dynamo could be used as a motor, which he demonstrated to great effect at exhibitions in Vienna and Philadelphia by connecting two such DC motors at a distance of up to 2 km away from each other, one as a generator.

In 1886, Frank Julian Sprague invented the first practical DC motor, a non-sparking motor that maintained relatively constant speed under variable loads. Other Sprague electric inventions about this time greatly improved grid electric distribution (prior work done while employed by Thomas Edison), allowed power from electric motors to be returned to the electric grid, provided for electric distribution to trolleys via overhead wires and the trolley pole, and provided controls synchronous motor
systems for electric operations. This allowed Sprague to use electric motors to invent the first electric trolley system in 1887–88 in Richmond VA, the electric elevator and control system in 1892, and the electric subway with independently powered centrally controlled cars, which were first installed in 1892 in Chicago by the South Side Elevated Railway where it became popularly known as the "L".

Sprague's motor and related inventions led to an explosion of interest and use in electric motors for industry, while almost simultaneously another great inventor was developing its primary competitor, which would become much more widespread. The development of electric motors of acceptable efficiency was delayed for several decades by failure to recognize the extreme importance of a relatively small air gap between rotor and stator. Efficient designs have a comparatively small air gap.ac electric motor The St. Louis motor, long used in classrooms to illustrate motor principles, is extremely inefficient for the same reason, as well as appearing nothing like a modern motor.

Application of electric motors revolutionized industry. Industrial processes were no longer limited by power transmission using line shafts, belts, compressed air or hydraulic pressure. Instead every machine could be equipped with its own electric motor, providing easy control at the point of use, and improving power transmission efficiency. Electric motors applied in agriculture eliminated human and animal muscle www.dongfeng-motor.com power from such tasks as handling grain or pumping water. Household uses of electric motors reduced heavy labor in the home and made higher standards of convenience, comfort and safety possible. Today, electric motors stand for more than half of the electric energy consumption in the US.

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