The RIGHT MOTOR for the right place

摘要

Much has been written about the process of selecting motors for applications in motion control. The decisions to be made include whether to employ brushless or brushed dc, or stepper motors. Stepper motors are generally considered special-purpose devices because they can't handle large inertial loads very well. In contrast, dc motors are usually considered more general-purpose motion-control devices. Parameters that define the best motor type for an application include the mechanical output power, the shaft bearing system, the commutation system, and the possible combinations with gearheads and sensors. The most important criteria include the required speed and torque and the commutation system. There are a number of factors that can influence a motor's rated torque. Motor manufacturers usually specify rated torque under conditions that are well spelled out. Before one can specify the appropriate winding for a motor type, it is necessary to understand the winding electrical qualities and how they influence motor performance.