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.

(armature) current and rotor coil current is the same? What is the relationship between them

The two are different.Coil current is branch current (ia), rotor current (ia) is more than the total

current branch. Branch of how many depends on the type of winding.In terms of single pile, shan bo

winding, the single lap winding of three phase generatora route.(2 a) is equal to the number of poles (2 p), namely Motor vehicle a = 2 p.Shan bo winding because has nothing to do with the number of magnetic poles, only two.Article 2 a = 2.So, shan bo winding rotor current Ia Ia = 2.After understand this, for the rotor.The cross-sectional area of.electricalmotor1.blogspot.com winding wire (guidelines) have a certain guiding role.

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

YEJ Series Electromagnetic Brake Three-Phase Asynchronous Electro motor

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