![]() ![]() When the poles are magnetized, the rotor teeth become attracted to the energized stator poles and rotate to line up. Referring to the diagram below, the poles become magnetized when the stator windings are energized with DC current. The equation relating these two variables can be found in the formula section of this guide. The step angles taken in VR stepper motors are related to the number of teeth contained within the stator and rotor. In general operation, VR stepper motors have relatively high step rates of 5 to 15 degrees and no detent torque. They generally operate on the basic principle of the magnetic flux finding the lowest reluctance pathway through a magnetic circuit. VR stepper motors are characterized as having multiple soft iron rotors and a wound stator. The three most common types of stepper motors are Variable Reluctance, Permanent Magnet, and Hybrid Stepper Motors. Increasing input pulse frequency increases shaft rotation speed.Ī stepper motor varies per application by construction and functionality. Another relation between the input pulses and motor's rotation is that between frequency and speed. When proper sequential pulses are delivered to the device, the shaft will undergo a clockwise or counterclockwise rotation. One such relationship is that between the applied pulse sequence and rotation direction. There are numerous relationships between input pulses and the motor’s shaft rotation. Each revolution requires a given number of pulses, each of which equals one rotary increment or step, which is only a portion of one complete rotation. A train of digital pulses translates into shaft revolutions. A pulse (also referred to as a clock or step signal) can be produced by microprocessors, timing logic, a toggle switch or relay closure. ![]() In the case of rotational motion, receiving digital pulses in a correct sequence allows the shaft to rotate in discrete step increments. The main use of stepper motors is to control motion, whether linear or rotational. ![]()
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