Mass velocity controller
AssigneeTektronix, Inc.
InventorEdward F. Burke
Life of this patent
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Abstract
A system (11) for monitoring and controlling the movement of a mass (12) along a predetermined path (14) by a motor-driven flexible member (20) is provided to modulate the motor drive output so that the actual velocity of the mass corresponds more closely to the desired target velocity profile. The system preferably employs a dual loop servo system wherein an outer servo loop uses conventional linear encoding techniques and is supplemented by an inner servo loop utilizing a sensor (27) that detects a physical characteristic of the flexible member representative of the relative velocity of the mass. Relative velocity transducers utilizing magnetic circuits and operating according to variable reluctance principles for generating relative mass velocity signals directly are disclosed.
Claims20
A system for monitoring the movement of a mass driven by a flexible element comprising:
- a mass moveable along a predetermined path;
- a flexible element coupled to the mass;
- a motor for driving the flexible element and thereby the mass along a predetermined path;
- a transducer mounted on the mass and in communication with the flexible element capable of detecting a physical characteristic of the flexible element representative of velocity of the mass relative to velocity of the motor;
- and
- means for generating a relative velocity signal therefrom.
A dual loop servo system for monitoring and controlling the movement of a mass moved along a predetermined path by a motor-driven flexible member comprising:
- an outer servo loop employing linear encoder techniques to generate a signal indicative of the velocity of the mass;
- and
- an inner servo loop employing a sensor that detects a physical characteristic of the flexible member representative of the velocity of the mass relative to the velocity of the motor to generate a relative velocity signal.
A dual loop servo system for monitoring and controlling the movement of a mass moved along a predetermined path by a motor-driven flexible member comprising:
- a first servo loop employing linear encoder techniques to generate a mass velocity signal;
- and
- a second servo loop employing a sensor that detects a physical characteristic of the flexible member representative of the velocity of the mass relative to the velocity of the motor.
A relative velocity transducer that senses velocity of a mass movable along a predetermined path by a motor-driven flexible element coupled to the mass relative to the velocity of rotational output of the motor utilizing a magnetic circuit operating according to variable reluctance principles.
Dependencies are inferred from the claim text.