Motori a riluttanza variabile - [ Translate this page ]25 giu 1999 ... I motori a riluttanza variabile anche denominati motori VR, si possono considerare come la classe più importante; un semplice esempio di ...
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Magnetless versions

Variable-reluctance (VR) or switched-reluctance (SR) motors also can operate as brushless dc motors. VR motors have salient poles on a soft-iron rotor. Motor action results from interaction between the rotor poles and a rotating field set up by the stator windings. The construction yields high torque-to-inertia ratios.

VR motors cost less than corresponding permanent-magnet brushless types. And because VR types call for unidirectional current, amplifiers for them cost less than those for conventional types. The motors are increasingly used in motion-control systems that require very high torque or high horsepower -- levels where the cost of magnets in conventional PM motors become excessive.

A 150-pole version of a variable-reluctance motor is widely used for powering robots and other machines calling for slow speed and precise positioning. The motors exhibit much wider bandwidths -- typically over 80 Hz -- than conventional motors. A 32-bit microprocessor-based adaptive controller adjusts frequency response in real time.
Brushless servo motor - motor controller | gear motor | gearmotor ...brushless AC electric servo-motor Applied Motion Products .... in both incremental motion and continuous speed that is not attainable with conventional ...
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