Motor overload phenomenon

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Motor overload phenomenon

Overload

Overloading is putting too much load on an electric motor. The motor should attempt to pull in the loaded load when the power is turned on (ON). The larger the load, the more the required capacity. All motors have a limit to the load they pull. For example, a 3ɸ 460V, 5 Hp motor should be used no more than 7.6 A. See table 430.250 of the NEC standard. Overloads do not harm an appropriately protected motor. Any overload present longer than the delay created inside the protective device will be detected and eliminated. The properly sized heating elements in the motor starter ensure an overload is removed before any failure occurs.

The repairer can observe the black burn of all motor windings, it occurs when a motor is damaged by overload. Black burns are all caused by the slow destruction of the motor over a long time. There is no apparent damage to the insulation and no isolated damaged areas.

If a motor uses rated current, it works with its maximum rating. If the motor is used with a current higher than the specified norm, the motor is overloaded. If the overload problem becomes a serious problem, the motor size may be increased or the motor load may be reduced.

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SAI GON KIM LAN JSC CORP

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