Synchronous Machine


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synchronous machine

[′siŋ·krə·nəs mə′shēn]
(electricity)
An alternating-current machine whose average speed is proportional to the frequency of the applied or generated voltage.

Synchronous Machine

 

an AC machine (usually three-phase) whose rotational speed n is proportional to the frequency of the power circuit. The relation between n and f is given by the equation n = f/p, where P is the number of pole pairs in the machine.

Depending on how they are operated, synchronous machines are classified as synchronous generators (generators of active power), synchronous motors (motors with a constant rotational speed), and synchronous condensers (generators of reactive power). A synchronous machine can perform any of these three roles. In practice, however, present-day synchronous generators, motors, and condensers have certain design differences.

The principal components of a synchronous machine are a stator and a salient-pole or nonsalient-pole rotor. The stator has an AC winding. The rotor winding is the field winding and is always supplied with direct current through slip rings. Sometimes in low-power (up to 20 kilowatts) machines, the AC winding is placed on the rotor, and the field winding on the stator. This type of machine is said to be of inverted design.

REFERENCES

Petrov, G. N. Elektricheskie mashiny, part 2. Moscow-Leningrad, 1963.
Kostenko, M. P., and L. M. Piotrovskii. Elektricheskie mashiny, 3rd ed., part 2. Leningrad, 1973.
Vol’dek, A. I. Elektricheskie mashiny, 2nd ed. Leningrad, 1974.

M. D. NAKHODKIN

References in periodicals archive ?
Friedrich, "Modelling of a wound rotor salient pole synchronous machine and its converter in the constant power zone," in Congres EVS-17, 2000.
Recently, dual three-phase stator windings based permanent magnet synchronous machines have been modeled, designed and tested for industrial automation and electrified transportation applications [17-19].
In this grid, the synchronous machine is absent and the inverter was used to replace it by means of operation as the synchronverter while other less powerful inverters can be connected to such grid.
Therefore first expression that must be optimized is shown in th equation (4): Minimum (J1) = ) 4( Increase in the critical clearing time leads to the increase in the angular stability of the rotor of the synchronous machine. The swing equation for the ith synchronous machine can be written according to equation (5) it is observed that with the reduction in reactive power changes during fault occurrence the angular stability increasing is available.
Based on remarkable advantages such as low inertia, high efficiency, high torque-to-current and torque-to-volume ratios (high power density), compact structure, fast dynamic response and reliability, the Permanent Magnet Synchronous machines (PMSMs) drives are replacing classic DC and induction machine drives in a variety of residential and industrial applications where fast and accurate torque response is required such as industrial robots and machine tools with high-performance servo drives.
Kawamura, "A multipole synchronous machine with non-overlapping concentrated armature and field windings on the stator," IEEE Trans.
Hu, "A novel direct torque controlled interior permanent magnet synchronous machine drive with low ripple in flux and torque and fixed switching frequency," IEEE Transactions on Power Electronics, vol.
The gearless motor--also called a wrap-around motor or ring motor--is a large synchronous machine, which uses power electronics and a magnetic field to control the speed of the motor rotation.
Iana 'Matlab & Simulink Simulation with FPGA-Based Implementation Sliding Mode Control of a Permanent Magnet Synchronous Machine Drive.
These equations directly follow form the equations of the smooth-air-gap synchronous machine expressed in the rotor reference frame, but instead of the flux linkage produced by field winding, now the magnetic flux [[PSI].sub.PM] is present
The 1eDT240 uses a permanently synchronous machine that delivers maximum output of 82kW.

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