the purpose of the motor starter is to protect the motor, personnel, and associated equipment. our company is professional hydraulic motor,piston motor,hydraulic winch,gearbox,pg电子下载-pg电子游戏 supplier providing customers from domestic zhongyiyepk and overseas the best and reliable hydraulic products.welcome to visit our website.over 90% of the motors used are ac induction motors, and motor starters are used to start and stop them. a more generic term would identify this piece of equipment as a motor controller.
a controller may include several functions, such as starting, stopping, overcurrent protection, overload protection, reversing, and braking. the motor starter is selected to match the voltage and horsepower of the system. other factors used to select the starter include: motor speed, torque, full load current (flc), service factor (sf), and time rating (10 or 20 seconds).
understanding the thermal patterns of this equipment is critical to a successful inspection. also correctly identifying the source of the anomaly can make recommendations more valuable.
motors may be damaged or their life significantly reduced if they operate continuously at a current above full load current. motors are designed to handle in-rush or locked rotor currents without much temperature increase, providing there is a limited duration and a limited number of starts. overcurrents up to locked rotor current are generally caused by mechanical overloading of the motor. the national electric code (nec) describes overcurrent protection for this situation as "motor running overcurrent (overload) protection."
this can be shortened to overload protection. overcurrents caused by short circuits or ground faults are dramatically higher than those caused by mechanical overloads or excessive starts. the nec describes this type of overcurrent protection as "motor branch-circuit short-circuit and ground-fault protection." this can be shortened to overcurrent protection. the four common varieties of motor starters are: across-the-line, the reversing starter, the multispeed starter, and the reduced voltage starter. motor starters are generally comprised of the same types of components. these include a breaker or fused disconnect, contactor and overloads. there may also be additional components, including control circuitry and a transformer. understanding the thermal patterns of this equipment is critical to a successful inspection. also correctly identifying the source of the anomaly can make recommendations more valuable.
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