SLIP
(Serial Line IP) A communications protocol for dial-up access to TCP/IP networks. It was commonly used to gain access to the Internet as well as to provide dial-up access between LANs. SLIP transmits IP packets over any serial link (dial up or private lines). SLIP has been mostly superseded by the Point-to-Point Protocol (PPP). See CSLIP and PPP.
slip11. US and Canadian a narrow space between two piers in which vessels may dock
3. a kind of dog lead that allows for the quick release of the dog
4. a small block of hard steel of known thickness used for measurement, usually forming one of a set
5. Engineering the ratio between output speed and input speed of a transmission device when subtracted from unity, esp of a drive belt or clutch that is not transmitting full power
6. Cricketa. the position of the fielder who stands a little way behind and to the offside of the wicketkeeper
b. the fielder himself
7. the relative movement of rocks along a fault plane
8. a landslide, esp one blocking a road or railway line
9. Metallurgy crystallog the deformation of a metallic crystal caused when one part glides over another part along a plane
10. the deviation of a propeller from its helical path through a fluid, expressed as the difference between its actual forward motion and its theoretical forward motion in one revolution
slip21. a part of a plant that, when detached from the parent, will grow into a new plant; cutting; scion
2. Dialect a young pig
3. Chiefly US a pew or similar long narrow seat
4. a small piece of abrasive material of tapering section used in honing
slip clay mixed with water to a creamy consistency, used for decorating or patching a ceramic piece
Slip (electricity) A numerical value used in describing the performance of electrical couplings and induction machines. In an electrical coupling, slip is defined simply as the difference between the speeds of the two rotating members. In an induction motor, slip is a measure of the difference between synchronous speed and shaft speed.
When the stator windings of an induction motor are connected to a suitable alternating voltage supply, they set up a rotating magnetic field within the motor. The speed of rotation of this field is called synchronous speed, and is given by Eq. (1) or
(1)
(2)
Eq. (2), where
f is the line frequency and
p is the number of magnetic poles of the field. The number of poles is determined by the design of the windings. In accord with Faraday's voltage law, a magnetic field can induce voltage in a coil only when the flux linking the coil varies with time. If the rotor were to turn at the same speed as the stator field, the flux linkage with the rotor would be constant. No voltages would be induced in the rotor windings, no rotor current would flow, and no torque would be developed. For motor action it is necessary that the rotor windings move backward relative to the magnetic field so that Faraday's law voltages may be induced in them. That is, there must be slip between the rotor and the field.
See Electromagnetic induction,
Induction motor The amount of slip may be expressed as the difference between the field and rotor speeds in revolutions per minute or radians per second. However, the slip of an induction motor is most commonly defined as a decimal fraction of synchronous speed, as in Eq. (3) or Eq. (4).
(3)
(4)
Here
n is the motor speed in revolutions per minute, &ohgr; is its speed in radians per second, and
s is the slip, or more properly the per unit slip. Typical full-load values of slip for an induction motor range from 0.02 to 0.15, depending on rotor design. Slip is sometimes expressed in percent of synchronous speed, rather than per unit. If an induction machine is driven faster than synchronous speed, the slip becomes negative, and the machine acts as a generator, forcing energy back into the electrical supply line.
See Electric rotating machinery
| 1. | | SLIP - Serial Line Internet Protocol. | |
| 2. | | SLIP - Symmetric LIst Processsor. Early 1960's list processing
subroutine package for Fortran by J. Weizenbaum. Later also
embedded in MAD and ALGOL. ["Symmetric List Processor",
J. Weizenbaum CACM 6:524-544(1963). Sammet 1969, p.387]. | |