![]() ![]() Stepper motors are usually rated in terms of their holding torque and can even hold a position (to a lesser degree) without power applied, using magnetic ‘detent’ torque. – Stepper motors have very good low speed and holding torque. Motors with contact brushes create sparks, undesirable in certain environments. The size of this step is dependent on the teeth arrangement of the motor, but a common value is 1.8 degrees, or 200 steps per revolution. Each step causes the shaft to rotate a certain number of degrees. A step is defined as the angular rotation produced by the output shaft each time the motor receives a step pulse. ![]() Each revolution of the stepper motor’s shaft is made up of a series of discrete individual steps. A stepper motor converts electronic pulses into proportionate mechanical movement. ![]() In other words, they can run “open-loop”, which significantly reduces the cost of a position control system. The main advantage of stepper motors is that they can achieve accurate position control without the requirement for position feedback. Stepper motors were developed in the early 1960’s as a low cost alternative to position servo systems in the emerging computer peripheral industry. RH2T Magazine Vol 2, Dec 2009 STEPPER MOTORS OPERATE DIFFERENTLY FROM NORMAL DC MOTORS, WHICH ROTATE WHEN VOLTAGE IS APPLIED TO THEIR TERMINALS. ![]()
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