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Increasing Permanent Magnet DC Motor Safety with Effective Protection Solutions

A PM motor is typically constructed with a stator that features a permanent magnet and a rotor. For safety reasons, manufacturers add protection to the motor in the event that the rotor locks or an overload condition occurs during operation. This application note provides an overview of how PM DC motors work and compares the two most common forms of thermal protection for DC motors – bimetal and polymer PTC protection devices.
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