as manufacturing and industrial facilities evolved over the years, so have the ways we power the machinery. 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.by power, i am referring to the controlling or initiating motion to perform a process. the key here is the industrial motors themselves.
whether they're small, medium, or large, motors need to be controlled. they need to be started, stopped, and varied in overall speed for safety and also to properly perform their selected function. a motor rotating at unsafe speeds can be hazardous to personnel and dangerous to the equipment to which they are connected. the motor controller comes into play to do just that. control of the startup as well as the acceleration to an appropriate speed, then the monitoring of the motor to ensure it is operating within its power rating, and of course the stoppage of the motor.
for decades, a magnetic dc motor control was the most efficient way to get the job done. these sometimes complex circuits composed of relays, contactors, timers, and resistors could be found anywhere there was an industrial electric motor. at the time, they were new technology replacing drum controllers which used the human element to control a motor's acceleration. on these controllers, an operator had the responsibility of turning on the motor and bringing it up to its proper speed using a handle attached to a drum of contacts. the faster the operator turned the handle, the faster the motor accelerated. operating speed for the motor could also be controlled using the handle by stopping at a certain position short of full deflection. motors could also be reversed using these controls by turning the handle in the opposite direction. drum controllers relied too much on an operator's gentle touch to be efficient and safe. the dc magnetic controller easily became the accepted method of motor control in its time.
the controlled acceleration of a dc motor and its controlled top speed made these controllers ideal for industrial machinery. the names cutler hammer, westinghouse, allen bradley, and general electric were synonamous with motor control. they all consisted of similar circuitry but various manufacturers had their own improvements and idiocyncrasies. the motor is usually started and stopped from a normally open and normally closed push button assembly. this controls a relay typically labeled cr, for control relay. the control circuit was also interfaced with overload and overtemp contacts for protection of the motor, the machinery, and human personnel. an m contactor indicates a main contactor. these dc contactors are designed with large current carrying contacts because they are responsible for applying and disconnecting the main circuit for the armature. once the control circuit is energized, the accelerating of the motor is initiated using a series of resistors and contactors. these contactors are typically labeled 1a, 2a, 3a, and so forth. accelerating contacts are opened and closed based on the armature current draw in some controllers and by timers in others.
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