16 Years Factory Air circuit breaker-FTW3 Export to Vancouver
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With the "Client-Oriented" business philosophy, a rigorous quality control system, advanced manufacturing equipment and a strong R&D team, we always provide high quality products, excellent services and competitive prices for 16 Years Factory Air circuit breaker-FTW3 Export to Vancouver, With the aim of "compete with good quality and develop with creativity" and the service principle of "take customers' demand as orientation", we will earnestly provide qualified products and good service for domestic and international customers.
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The simplest case is a switch to connect a motor to a power source, such as in small appliances or power tools. The switch may be manually operated or may be a relay or contactor connected to some form of sensor to automatically start and stop the motor. The switch may have several positions to select different connections of the motor. This may allow reduced-voltage starting of the motor, reversing control or selection of multiple speeds. Overload and over current protection may be omitted in very small motor controllers, which rely on the supplying circuit to have over current protection. Small motors may have built-in overload devices to automatically open the circuit on overload. Larger motors have a protective overload relay or temperature sensing relay included in the controller and fuses or circuit breakers for over current protection. An automatic motor controller may also include limit switches or other devices to protect the driven machinery.
More complex motor controllers may be used to accurately control the speed and torque of the connected motor (or motors) and may be part of closed loop control systems for precise positioning of a driven machine. For example, a numerically controlled lathe will accurately position the cutting tool according to a preprogrammed profile and compensate for varying load conditions and perturbing forces to maintain tool position.