Motor-vibrator assembly for a vibrating machine
AssigneeOli S.P.A.
InventorsMichele Modenese, Raffaello Frati, Giacomo Fabbri
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Abstract
Motor-vibrator assembly for a vibrating machine having a plurality of motor-vibrators, each having a synchronous motor and at least one eccentric mass divided into two bodies fixed to two respective free ends of the shaft of the motor. The motor-vibrator assembly comprises position sensing means to sense the angular position and the angular velocity of the shafts of the synchronous motors, electronic drive devices to operate the synchronous motors and an electronic control unit, which is configured to control the electronic drive devices based on the angular positions and on the angular velocities sensed, so that the motor-vibrator assembly generates a predetermined vibratory motion.
Claims16
Motor-vibrator assembly for a vibrating machine, the motor-vibrator assembly comprising a plurality of motor-vibrators, each of which comprises an electric motor consisting of a synchronous motor and at least one eccentric mass connected on the drive shaft of the synchronous motor, position sensing means to sense the angular position and measure the angular velocity of the drive shafts, electronic drive means to drive the synchronous motors, and electronic control means, which are configured to control said electronic drive means based on the angular positions sensed and on the angular velocities measured so that the motor-vibrator assembly generates a predetermined vibratory motion;
- wherein the eccentric mass is fixed to the drive shaft of the relative synchronous motor and is divided into two bodies which are fixed to two respective free ends of the drive shaft, the two free ends of the drive shaft projecting from a casing of the synchronous motor in the area of two respective opposite longitudinal ends of the synchronous motor;
- wherein said electronic control means are configured to control said electronic drive means in order to bring the drive shafts in rotation according to respective angular velocity profiles along a turn angle and respective directions of rotation, by keeping the centres of gravity of the eccentric masses in phase with each other or out of phase with each other according to predetermined angular deviations, in order to obtain said predetermined vibratory motion.
Method to control a vibrating machine comprising a body, elastic means to mount the body on a base and a motor-vibrator assembly comprising:
- a plurality of motor-vibrators, each of which is fixed to the body and comprises a synchronous motor and at least one eccentric mass fixed on the drive shaft of the synchronous motor, the eccentric mass being divided into two bodies fixed to two free ends of the drive shaft, the two free ends of the drive shaft projecting from a casing of the synchronous motor in the area of two respective opposite longitudinal ends of the synchronous motor;
- position sensing means to sense the angular position and measure the angular velocity of the drive shafts;
- and electronic drive means to drive the synchronous motors;
- the method comprising:
- sensing first vibrations by means of first acceleration sensing means fixed to a casing of the synchronous motor;
- processing the first vibrations sensed so as to determine a vibrational state of the motor-vibrator assembly;
- and
- controlling the electronic drive means based on the angular positions sensed, on the angular velocities measured and on the vibrational state, so that the motor-vibrator assembly generates a predetermined vibratory motion;
- wherein said body is designed to contain material to be treated by means of said vibratory motion and the vibrating machine receives the material from a further machine;
- the method comprising:
- sensing the load of material in the further machine by means of load sensing means, before the material is transferred onto the vibrating machine;
- said electronic drive means being controlled based on the load sensed.
Dependencies are inferred from the claim text.