Apparatus for use with a motor drive
AssigneeOlympus Optical Co., Ltd.
InventorsKatumi Terada, Kazuyuki Nemoto
Life of this patent
Estimating the term…
Abstract
An apparatus is provided for use with a motor drive for cancelling the electromagnetic reaction energies developed by a pair of drive motors upon rapid starting or sudden stopping, the latter occurring upon the application of dynamic braking to said motor drive. The apparatus comprises a pair of motors each provided with rotors preferably having moments of inertia which are substantially equal. The output shafts of the motors are operatively connected so as to rotate in opposing directions.
Claims9
Apparatus for use with a motor drive comprising:
- a pair of motors each having a cooperating stator and rotor and an output shaft operatively driven by said rotor:
- the moments of inertia of said motors being substantially equal;
- circuit means including a power source for selectively energizing and deenergizing said pair of motors substantially simultaneously;
- means for maintaining said motors in fixed positions relative to one another;
- means including gear means operatively coupling the output shafts of said motors in such a manner that the output torque of the apparatus is substantially the sum of the torques of said motors and that the output shafts rotate in opposite directions, whereby the electromagnetic reaction energies developed by said motors when they are rapidly accelerated or decelerated, tend to cancel one another;
- said circuit means including switch means for simultaneously coupling said motors to said power source when said switch means is moved to a first position;
- and
- said switch means further including means for simultaneously applying dynamic braking to both of said motors when said switch means is moved to a second position.
Apparatus for use with a motor drive comprising a pair of motors each having a cooperating stator and rotor and an output shaft operatively driven by said rotor;
- means for maintaining said motors in fixed positions relative to one another;
- means operatively connecting the output shafts of said motors in such a manner that the output shafts rotate in opposite directions, whereby the electromagnetic reaction energies developed by said motors when they are rapidly accelerated or decelerated, tend to cancel one another;
- a source of power;
- first and second switch means, each associated with one of said motors and each being adapted to couple its associated motor to said source of power when moved to a first position;
- means associated with said first and second switch means for applying dynamic braking to its associated motor when said first and second switch means are moved to a second position;
- delay means responsive to movement of one of said first and second switch means to said second position for moving the remaining one of said first and second switch means to said second position after a predetermined time delay, the length of said delay compensating for the difference between the operating characteristics of said motors so that the electromagnetic reaction energies developed by said motors tend to cancel one another when the first and second switch means are moved to said second position.
Dependencies are inferred from the claim text.