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运动控制名词解释2（Glossary of Motion Control Terms 2） |
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原文链接： http://www.control-drive.com/glossary.html
Control Area Network (CAN):
Is a serial bus system, which was originally developed for automotive applications in the early 1980's. The CAN protocol was internationally standardized in 1993 as ISO 11898-1 and comprise the data link layer of the seven layer ISO/OSI reference model.
CANopen:
CANopen is a CAN-based higher layer protocol. It was developed as a standardized embedded network with highly flexible configuration capabilities. CANopen was designed motion oriented machine control networks, such as handling systems. It is used in many various fields, such as medical equipment, off-road vehicles, maritime electronics, public transportation, building automation, etc.
C-face mounting:
A standard NEMA mounting design, where the mounting holes in the face are threaded to receive the mating mount.
Class B insulation:
A NEMA insulation specification. Class B insulation is rated to an operating (internal) temperature of 130°C.
Class F insulation:
A NEMA insulation specification. Class F insulation is rated to an operating (internal) temperature of 155°C
Class H insulation:
A NEMA insulation specification. Class H insulation is rated to an operating (internal) temperature of 180°C.
Closed Loop System:
In motion control, this term describes a system wherein a velocity or position (or both) sensor is used to generate signals for comparison to desired parameters. For cases where loads are not predictable, the closed loop feedback from an external encoder to the controller may be used for stall detection, position maintenance or position verification.
Closed Loop:
A broadly applied term relating to any system where the output is measured and compared to the input. The output is then adjusted to reach the desired condition. In motion control, the term describes a system wherein a velocity or position (or both) transducer is used to generate correction signals by comparison to desired parameters.
Constant Current driver:
A control or device for adjusting the voltage to force or maintain design current in the winding when switching from one winding to another.
Coefficient of Friction:
This is defined as the ratio of the force required to move a given load to the magnitude of that load. Typical values for the ball and crossed roller slides are 0.001 to 0.005.
Cogging:
A term used to describe non-uniform angular velocity. Cogging appears as a jerkiness especially at low speeds.
Command Position:
The desired angular or linear position of an actuator.
Commutation:
The switching sequence of drive voltage into motor phase windings necessary to assure continuous motor rotation. A brushed motor relies upon brush/bar contact to mechanically switch the windings. A brushless motor requires a device that senses rotor rotational position, feeds that information to a drive that determines the next switching sequence.
Commutator:
A mechanical cylinder consisting of alternating segments of conductive and insulating material. This cylinder used in DC motors passes currents from the brushes into the rotor windings and performs motor commutation as the motor rotates.
Compensation:
The corrective or control action in a feedback loop system which is used to improve system performance characteristics such as accuracy and response time.
Compensation, Feedforward:
A control action which depends on the command only and not the error to improve system response time.
Compensation, Integral:
A control action which is proportional to the integral or accumulative time error value product of the feedback loop error signal. It is usually used to reduce static error.
Compensation, Lag:
A control action which causes the lag at low frequencies and tends to increase the delay between the input and output of a system while decreasing static error.
Compensation, Lead:
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