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Commonly used terms in the Electrical industry.
single-phase inverter
an inverter with a single-phase AC voltage output. Half-bridge and full-bridge configurations are commonly used.
single-phase rectifier
a rectifier with a single-phase AC voltage input. See also half-wave rectifier and full-wave rectifier.
single-phasing
a condition that occurs when a three-phase motor has an open circuit occur in one of the three lines. The motor continues to operate with one line to line voltage as a single-phase motor, with an increase in noise, vibration, and current. Proper overload protection should detect the higher current and shut down the motor after some time delay.
single-pole reclosing
the practice of clearing a fault which appears on one phase of a three-phase electric power line by disconnecting and reclosing only that phase as opposed to opening and reclosing all three phase conductors.
single-pole double-throw (SPDT)
a switch that has a common port and two output ports. Among these two ports, only one selected port can be connected to the common port.
single-pole single-throw (SPST)
a switch that has a pair of input-output ports. By changing its status, the switch works as short or open circuit.
skew
(1) an arrangement of slots or conductors in squirrel cage rotors so that they are not parallel to the rotor axis.
(2) in computer buses, a condition where values on certain bus lines have slightly different transmission times than values on other lines of the same bus. See also tape skew.
skewed symmetry
the nonperpendicular appearance of a symmetry-axes system for an object, when the plane of the object is not perpendicular to the line of sight from the viewpoint.
skewing
(1) the bending of a curve away from it's original shape.
(2) In a differential amplifier, the offset between two signals.
skin effect
the tendency of an alternating current to concentrate in the areas of lowest impedance.
slip
in an induction motor, slip is defined as the ratio of the slip speed to the synchronous speed. The slip speed is the difference between the synchronous speed and the speed of the rotor.
See
synchronous speed
slip frequency
the frequency of the rotor induced currents in an induction machine. Denoted by fsl, the slip frequency is given by slip - stator frequency (fs) and is the prime frequency used in slip frequency control of induction machines.
slip power recovery control
a method of controlling the speed of a wound rotor induction machine by recovering the slip frequency power from the rotor to an AC power source or mechanical shaft through the converter connected to the rotor windings of the motor. Slip power recovery control reduces the losses that occur with rotor resistance control.
slip-ring contact
a rotating, brush-contacted ring electrode connected to one end of a coil in an AC generator.
slot
a space between the teeth used to place windings in electrical machines.
slot pitch
the angular distance (normally in electrical degrees) between the axes of two slots.
slotless motor
permanent magnet brush-less DC motor in which stator teeth are removed and the resulting space is partially filled with copper. The slotless construction permits an increase in rotor diameter within the same frame size, or alternatively an increase in electric loading without a corresponding increase in current density.
soil electrode
an electrical connection to the soil, often in the form of a metal stake driven into the earth.
solenoid
a wound cylindrical and magnetic material assembly used typically for producing linear motions.
solidly grounded
an electrical distribution system in which one of the normal current-carrying conductors, often the neutral, is intentionally connected to ground with no impedance other than that of the conductor comprising the connection.