Angular displacement

About: Angular displacement is a research topic. Over the lifetime, 5102 publications have been published within this topic receiving 46081 citations. The topic is also known as: rotational displacement.

Torque control apparatus for rotary machine

Abstract: A torque control apparatus for a compressor driven by a motor through a main shaft, in which variations of the rotation speed of the main shaft due to torque variations are detected at selected angular positions of rotation of the main shaft. Current values to be supplied to the motor for eliminating the rotation speed variations depending on the angular positions of rotation of the main shaft are computed and stored during at least one revolution of the main shaft, and, in the next revolution of the main shaft, that is, when the main shaft rotates then to a 360° advanced angular position, the motor current is controlled on the basis of the current values supplied for at least one revolution of the main shaft, thereby eliminaitng variations of the rotation-speed of the main shaft.

Belt drive control method and its device, belt device, image forming device, process cartridge, program, and recording medium

Abstract: PROBLEM TO BE SOLVED: To provide a belt drive control method and its device in which a belt is driven at a constant moving speed without being affected by the fluctuation in the thickness of the belt while increase in the cost is suppressed, to provide a belt device, a process cartridge, an image forming device, a program and a recording medium. SOLUTION: Detection is made for rotational angular displacement or rotational angular velocity of a follower roller 502, alternating components in the rotational angular velocity having the frequency corresponding to the periodic thickness fluctuation along the peripheral direction of a belt 500 are extracted based on the detection results and rotation of a driving roller 501 is controlled based on the amplitude and the phase of the alternating components. COPYRIGHT: (C)2005,JPO&NCIPI

Frequency Domain Modelling and Identification of 2D Digital Servo Valve

Abstract: The 2D digital servo valve studied here is a two-stage valve designed by using both rotary (angular) and linear motions of a spool. The rotary motion is driven by a stepper motor operating under continual angular displacement control, while the linear motion of the spool is actuated by hydraulic servo control with feedback of the spool's displacement, which is achieved by a unique “servo screw”.The modelling of the 2D valve is based on linear theory and is further verified by the special experiments. Because of the extremely large hydraulic natural frequency, the control of the 2D valve is identified as being that of a first-order-system. The relation between the time constant and the structural parameters is established, accounting for the non-linearity of the pilot hydraulic bridge. For the continual control of the stepper motor, a mathematical model considering the rotary motion, the rotating magnetic field and the angular control signal is established. In order to prevent the stepper motor fro...

Drive control method, drive control device, belt apparatus, image forming apparatus, image reading apparatus, computer product

Abstract: Driving of a pulse motor is controlled in such a manner that a rotating body driven by the pulse motor rotates at a uniform angular velocity. Angular displacement of the rotating body is detected, a difference between a detection value of the angular displacement and a target value of angular displacement set in advance is calculated, and a drive pulse frequency of a drive pulse signal to be used for driving the pulse motor is calculated based on the difference and a reference drive pulse frequency. Whether the difference is added to the reference drive pulse can be selected.

Calibration of an articulating probe head for a coordinate positioning machine

Abstract: A method is disclosed whereby a probe head which articulates a probe on the moveable arm of a coordinate measuring machine is calibrated to reduce the effect of errors, such as misalignment of the rotary axes of the head, and droop of the head and the probe. The method involves measurement of the probe position at a number of orientations of the head, the angle of orientation being determined by encoders within the head. Pairs of adjacent orientations at which the probe position is measured define segments, over which it is assumed that all errors change linearly. From the measured probe positions, a value of actual angular displacement between measured probe positions is calculated. The position of the probe at a given angular orientation within a segment may then be determined from the encoder reading at that orientation, and the ratio of the actual angular displacement between measured probe positions to the difference in the encoder readings at the orientations defining the segment (and corresponding to these measured positions). The size of the segments depends upon the linearity with which the droop changes with changing angular orientation of the head; as the change in droop becomes less linear, the segment size decreases in order to ensure that the assumption of linearity remains valid.