The brushless servomotors are permanent magnet three-phase syncronous motors which, incorporated to the electronic converters, build up the servosystems allowing to operate the axis which must assure the highest performances, both intended as torque and dynamics, above all when the speed control and the positioning are of utmost importance.
These R.C.V. servomotors are ideally suited and offer excellent performances to satisfy the following requirements:
The highest rapidity in the cycle – a brushless servomotor can reverse the direction of rotation in a few thousandths of second
An excellent control – only few motors of this kind, fitted with sophisticated seek sensors and driven by adequate electronic systems, can assure such a level of performance which was virtually inconceivable only some years ago
The utmost precision in the positioning – the use of modern seek transducers allows to reach precision in the positioning and obtain a repeteability of the result very near to thousandth of a millimeter
The uniformity in low speed running – absolutely only a brushless system can assure to operate at low speed without modifying the torque conditions and the regularity in the running, even intermittent
The very quick accelerations or decelerations – the reaction time of the brushless motors is less than the half of the one supplied by direct current motors
The sturdy construction – the absence of wiping contacts is a further warranty for long life and it spreads out the need for the regularly planned servicing
The overload capacity – the performances which can be obtained in relation to overload endurance are absolutely astonishing: approximately three times and a half the nominal current rate
The torsion rigidity – a brushless system, above all if fitted with axial air gap, features an extremely high torsion rigidity; if, furthermore, we consider the possibility to remove the reducers, the transmission shafts (in a word all the components building up the kinematic transmission line), therefore the allowance and the elasticity, this torsion rigidity of the system becomes exceptionally high
The high torque – the acceleration and running torque of the brushless servomotors can in no way be approached by traditional asynchronous or direct current motors
The low inertia or a specific inertia – a good electric plan of a brushless motor allows to obtain very low rotor inertia but, in some cases, different features are required and R.C.V. is in a position to study and develop machines with expressly calculated inertia according to the requirements
The strong pulse stress – a brushless motor only can fully stand intermittent cycles, contemplating reduced time intervals: up to 500 actions per minute!
The reduced overall dimensions – substantially the dimensional ratio between a brushless motor and a direct current motor is 1:4
The exclusion of reducers up to a ratio of 1:10 – the elimination of the reducers in the transmission of the motion is one of the most important advantages involved by the choice a a brushless motor, even in consideration of the exclusion of the allowance
The replacement of the transmission systems of the rotare motion with motors fitted with hollow shaft (even with through hole having considerable diameter) – often the coaxiality of the components to be moved will cause difficulty during operation, whereas a flat hollow shaft motor allows to make these elements pass through, thus reducing the overall dimensions and the connections.
The need to install the equipment in unfriendly environments – the presence of dust particles, fibrils, vapours, humidity or under extreme thermal conditions will not allow to install a traditional motor, but an expressly developed brushless motor will perfectly fit.