PLURAL ELECTRIC MOTOR CONTROL SYSTEMS
First Claim
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1. An electric motor system, comprising;
- a first electric motor and a first driven member, said motor comprising first and second independently rotatable rotors, one of which constitutes a motor armature while the other constitutes a casing and field winding, the first of said independently rotatable rotors being connected to drive said first driven member;
a second electric motor and a second driven member, said second motor comprising third and fourth independently rotatable rotors, one of which constitutes a second motor armature while the other constitutes a second casing and field winding, said third independently rotatable rotor being connected to drive said second driven member;
intercoupling drive means between said second and fourth independently rotatable rotors through which rotation of one of said second and fourth rotors produces opposite rotation of the other, whereby, the reaction torque on said first motor due to the driving thereby of said first driven member is sustained by the second motor, and vice versa;
electrical circuitry connecting the armatures and field windings of said first and second motors to a common electrical supply, and including switch means for removing the current supply from the armature of said second motor without interrupting the supply to the first motor, and electrical control means for changing the field current of said second motor.
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Abstract
An electric motor control system, in which: two coacting electric motors, each having a rotatable armature and rotatable casing and field assemblies, are arranged to afford infinitelyvariable speed-control of members driven by them jointly; and the motors are interconnected mechanically and electrically in such manner that, by operation of electrical control means in circuit with the motors, their respective armatures and field assemblies are enabled to rotate at different speeds and, during part of the acceleration and deceleration phases of operation, in opposite directions relative to each other.
14 Citations
7 Claims
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1. An electric motor system, comprising;
- a first electric motor and a first driven member, said motor comprising first and second independently rotatable rotors, one of which constitutes a motor armature while the other constitutes a casing and field winding, the first of said independently rotatable rotors being connected to drive said first driven member;
a second electric motor and a second driven member, said second motor comprising third and fourth independently rotatable rotors, one of which constitutes a second motor armature while the other constitutes a second casing and field winding, said third independently rotatable rotor being connected to drive said second driven member;
intercoupling drive means between said second and fourth independently rotatable rotors through which rotation of one of said second and fourth rotors produces opposite rotation of the other, whereby, the reaction torque on said first motor due to the driving thereby of said first driven member is sustained by the second motor, and vice versa;
electrical circuitry connecting the armatures and field windings of said first and second motors to a common electrical supply, and including switch means for removing the current supply from the armature of said second motor without interrupting the supply to the first motor, and electrical control means for changing the field current of said second motor.
- a first electric motor and a first driven member, said motor comprising first and second independently rotatable rotors, one of which constitutes a motor armature while the other constitutes a casing and field winding, the first of said independently rotatable rotors being connected to drive said first driven member;
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2. An electtic motor control system according to claim 1, in which each of the motors has its armature connected through gearing to a reversing gearbox, and has its casing arranged to drive the corresponding driven member.
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3. An electric motor control system according to claim 1, in which each of the motors has its rotatable casing connected to a reversing gearbox, and has its armature connected through gearing to the corresponding driven member.
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4. An electric motor control system according to claim 1, in which the motors have their casings coupled together by gearing, and each motor armature drives the corresponding driven member.
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5. An electric motor control system according to claim 1, in which the drive to each of the driven members is transmitted by epicyclic gearing or other speed-reduction gearing.
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6. An electric motor control system according to claim 1, in which the two motors are series-wound and have their field windings connected in series with each other across a DC supply;
- a switch is arranged so that it can short-circuit the supply to one of the motors; and
the same motor has the strength of its field controlled by a variable shunt resistance.
- a switch is arranged so that it can short-circuit the supply to one of the motors; and
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7. An electric motor control system according to claim 1, in which the two motors are connected across a DC supply, and the field of one or of each of them is arranged to be influenced by a DC chopping circuit which is electronically controlled.
Specification