Permanent Magnet Can Stack Motors for Clinical Diagnostics

Portescap stepper motor technology focuses on simplicity. Where reasonable accuracy and moderate torque are required, this permanent magnet stepper motor uses the simplest of techniques and designs to create an effective solution for many applications. The stepper motor is an electromechanical device that converts electrical pulses into discrete mechanical movements, and therefore can be operated directly from a pulse train or a microprocessor. The shaft of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence. The motor’s rotation has several direct relationships to these applied input pulses. The sequence of the applied pulses is directly related to the direction of motor shaft’s rotation. The speed of the motor shaft rotation is directly related to the frequency of the input pulses and the length of rotation is directly related to the number of input pulses applied. Error is non-cumulative as long as step integrity remains. Can stack motors are usually 2 phase in construction. They consist of two stator cups with claw tooth poles formed around a winding creating each half of the motor. The rotor has the same number of pole pairs as the stator, while the poles on each stator cup are constructed to be a half a pole pitch apart. With two coils, this means there can be 4 discrete positions per pole pitch. A 2-phase motor, for example, with 12-pole pairs in each stator / coil sector will therefore have 48 steps per revolution or 7.5 degrees per step. High-performance, Portescap stepper motors provide accuracy and torque to meet numerous application needs: Excellent open loop control solution High continuous motor torque output per package size Long life provided by high-quality bearing assembly Unipolar and bipolar windings available Stepper Motor Uses: Clinical Diagnostics Valves Pharmaceutical dispensing Robotics Antenna positioning Printers and copiers