Search results
Results from the WOW.Com Content Network
A resolver is similar to a synchro, but has a stator with four leads, the windings being 90 degrees apart physically instead of 120 degrees. Its rotor might be synchro-like, or have two sets of windings 90 degrees apart. Although a pair of resolvers could theoretically operate like a pair of synchros, resolvers are used for computation.
Concept of rotor excited resolver Rotor excitation and response. The most common type of resolver is the brushless transmitter resolver (other types are described at the end). On the outside, this type of resolver may look like a small electrical motor having a stator and rotor. On the inside, the configuration of the wire windings makes it ...
Analogue devices that perform a similar function include the synchro, the resolver, the rotary variable differential transformer (RVDT), and the rotary potentiometer. A linear encoder is similar to a rotary encoder, but measures position or motion in a straight line, rather than rotation. Linear encoders often use incremental encoding and are ...
Sometimes as a precaution against out-of-step connection of a machine to a system, a "synchro check" relay is installed that prevents closing the generator circuit breaker unless the machine is within a few electrical degrees of being in-phase with the system. Synchro check relays are also applied in places where several sources of supply may ...
Synchronous motors fall under the category of synchronous machines that also includes synchronous generators.Generator action occurs if the field poles are "driven ahead of the resultant air-gap flux by the forward motion of the prime mover".
However, the accuracy of this approach is low since it is difficult to discern slight phase differences, and the lamps do not show the relative speeds of the two systems. Synchroscopes are instruments that show the relative frequency (speed) difference and the phase angle between the machine to be synchronized and the system voltage.
It's a question that I think leaves most of us scratching our heads -- what exactly is the distinction between being Latino, Hispanic or Spanish? There's a difference, of course, between ethnicity ...
Positioning servomechanisms were first used in military fire-control and marine navigation equipment. Today servomechanisms are used in automatic machine tools, satellite-tracking antennas, remote control airplanes, automatic navigation systems on boats and planes, and antiaircraft-gun control systems.