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Definition of Inherent Motor Protection Devices

Despite our continued trek into the digital age, motors still hold a solid place in the market for electronic components. We rely on devices to safeguard their operation because it is impractical for a person to do so.

  1. Motor Operation Problems

    • All motors generate heat when they operate. The resistance of the motor windings as current flows through them is a byproduct that normally is not a problem. However, under heavy load or continued operation, this heat can accumulate to levels dangerous for use, leading to component failure or fire. Loose connections caused by wear can cause similar symptoms as well.

    General Motor Protection

    • Most electronic devices rely on numerous systems to protect them from fires or overloads. Fuses protect a device from the dangers of high current. Relays can allow components safe cycling times before restart to allow time for the components to return to safe temperature. However, these systems only protect the complete device.

    Inherent Motor Protection Devices

    • For complex devices, such as refrigerators, numerous motors exist on the same circuit. The fuse that protects the high-demand compressor motor will fail to protect the lower-demand motors found in the fans. Inherent motor protection devices allow for individualized safeguards for all the motors in a device. This means that each component contains an internal device that can shut it down if it begins to operate unsafely. Because these devices are so effective, they can be found in applications varying from aircraft to household appliances.

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