Abstract:
The feed system (30) for a honing machine (10) provides a capability to dynamically correct in real time errors in bore size inferred arising from variations in feed force, and a method of operation of the same. The system (10) allows a user to select between rate and force controlled honing modes, which provides one or more of the advantages of both modes. The system provides capabilities for automatic rapid automatic bore wall detection, compensation for elasticity of elements of the feed system (30) and honing tool (14), and automatic tool protection. The system is automatically operable using feed force, feed rate and positional information for honing a work piece (20) to one or more target parameters, such as one or more in-process sizes and a final size.
Abstract:
The invention relates to a positioner, especially for a valve that can be actuated by means of a drive. The inventive positioner comprises a locator (9) for detecting the real position of an actuator (7) and a control unit (13) for comparing the real position with a desired position that can be predetermined and for generating an actuating signal. A magnet (18) having a magnetoresistive sensor, preferably a GMR sensor, is provided as the locator. The locator (9) is less easily soiled and is less prone to wear and tear than a conventional slider potentiometer. The positioner is thus less interference-prone.
Abstract:
An improved method for controlling a servomechanism, applicable to nearly all types of servomechanism control systems. The inventive method improves the performance of servomechanism control systems which utilize a digital feedback sensor (20) by enabling the gain to be varied (16). The variable gain (16) allowed by the inventive method enables tighter control, and better performance.
Abstract:
A method and apparatus for controlling a positioning mechanism comprising a smaller scale positioning mechanism for moving a tool within a smaller scale work space and a larger scale positioning mechanism for changing a position of the smaller scale work space within the larger scale work space. A commanded position for the tool is received by a processor unit. An error component is determined using a difference between the commanded position and a current position of the tool in the larger scale work space. A restoring component configured to move the tool toward a selected position in the smaller scale work space is determined. Control signals for controlling the smaller scale positioning mechanism and the larger scale positioning mechanism together to move the tool from the current position to the commanded position are generated using the error component and the restoring component.
Abstract:
In a preferred embodiment, an apparatus, including: a motor; a code wheel attached to a rear surface of a rotor of the motor; and an read head/circuit board assembly attached to an inside surface of an end bell of the motor, the read head/circuit board assembly disposed so as to read the code wheel. A method of using the encoder is also provided.
Abstract:
A motion controller and a method of controlling the motion of a plurality of axes which prevents a discontinuous position command being generated to a follower axis. A follower mode transfer function circuit or routine generates a position command in response to a master axis position. This function can be in the form of electronic gearing or camming. A bias latch is utilized to offset any change in position resulting from a change in mode, such as changing from electronic gearing to electronic camming, changing cam profiles or gearing ratios, or changing the master axis. The latch is summed with the transfer function position command and a standard move command profile generator position command to provide the follower axis position command. The latch is recalculated each time the follower mode is changed. A halt command can be used to selectively block or enable an independent move command signal, allowing the follower axis to remain in motion when the follower mode is turned off (not following the master axis), or allowing the follower mode to be turned on while the follower axis is in motion without a sudden change in position. Trigger calculation circuitry is used to precalculate timing for activating the follower mode when follower mode is changed from off to on while the follower axis is already in motion such that the axes are in phase after ramping time.
Abstract:
Device for digitally slaving the position of a moving part, including: a digital sensor (20) which is intended to measure the actual position of the moving part (10) and delivers a digital effective position value, drive means comprising an electric motor (30) for driving the moving part into a setpoint position defined by a digital setpoint value, a digital control unit (50) delivering at least one signal for controlling a circuit (40) for supplying the motor as a function of the discrepancy between the said setpoint value and the said actual value, in which the digital sensor having a determined measuring interval, the motor supply circuit comprises timer means for maintaining the supply to the motor for the time which is necessary and sufficient for the sensor to be positioned at the middle of the interval corresponding to the setpoint value.
Abstract:
An actuator having electronically controllable tactile responsiveness which is flexibly programmable to facilitate provision in a single actuator of torque-position characteristics, such as a selectable number of detents per actuation through its full operative path. A rotary actuator (114) facilitates provision in a single actuator, of torque versus angular position characteristics, such as a selectable number of detents per revolution. The actuator is in communication with a servo motor (116) having a position encoder (118) which outputs position information to a controller (120) that has access to torque-position relation information. The controller outputs a digital torque signal, which is converted to an analog current signal applied to the servo motor (116). The torque, presenting a tactile response to a human interacting with the actuator (114), is sensed as a detent or a plurality of detents.
Abstract:
Es wird eine Reglerstruktur fr mehr als zwei mechanisch an ein bewegliches Element (1) gekoppelte Antriebseinheiten (10) beschrieben. Die Reglerstruktur weist ein Positionsmessgerät (4) zur Feststellung einer Ist-Lage (Xact) des beweglichen Elements und einen Lageregler (5) zur Berechnung einer Soll-Geschwindigkeit (Vnom) aus einer Soll-Lage (Xnom) und der Ist-Lage auf, wobei das Positionsmessgerät und der Lageregler allen Antriebseinheiten gemeinsam dienen. Jede Antriebseinheit verfügt aber jeweils über einen eigenen Geschwindigkeitsregler (6). Die Antriebseinheiten sind entweder als Master oder Slave konfiguriert, wobei einzelne Antriebseinheiten auch beide Funktionen wahrnehmen können. Ein Momenten-Master-Slave-Regler (8) sorgt für einen Ausgleich der Drehmomente zwischen den Antriebseinheiten.
Abstract:
Kinematic control of an electronic positioner and its associated actuator is effected through a control algorithm that delivers energy to the actuator based on observed motion produced by a previous delivery of energy. The algorithm achieves control based on a desired or user-specified resolution. Electronic braking between energy delivery intervals improves the speed at which the desired position is achieved. Temperature of the force producing mechanism is determined, as by monitoring energy consumed, and used to control how power is delivered to the actuator.