Title :
Design and analysis of a two-phase two-axis-compensated compulsator
Author :
Weiduo Zhao ; Liwei Song ; Shumei Cui
Author_Institution :
Dept. of Electr. Eng., Harbin Inst. of Technol., Harbin, China
Abstract :
As power supplies, compulsators are popular choices for electromagnetic railguns. In this paper, a two-phase two-axis-compensated compulsator (2P2AC compulsator) with lower internal inductance and higher power density was designed and analyzed. Two-phase armature windings are allocated on the stator, and discharge pulse currents to the load via a rectifier. This arrangement decouples the machine speed from the pulse width, thus enables a higher tip speed. Two sets of windings with electrical orthogonal displacement are allocated on the rotor. The bigger one is the field winding, which freewheels via a diode and provides the direct-axis compensation during the discharge process. While the smaller one is the short-circuit compensating winding providing the quadrature-axis compensation. The effect of the composition of the d- and q-axis compensation is equivalent to a passive compensation by using a continuous conductive shield, which compresses the flux for all rotor positions. Compared to the passive compensation, this arrangement has no conductive path to couple with the field winding due to the orthogonal displacement, thus speeding up the charging process. This paper presents the design methodology of the 2P2AC compulsator, along with its system performance of driving railgun load.
Keywords :
pulsed power supplies; rotors; short-circuit currents; 2P2AC compulsator; charging process; continuous conductive shield; diode; direct-axis compensation; discharge process; discharge pulse currents; electrical orthogonal displacement; electromagnetic railguns; field winding; freewheels; internal inductance; passive compensation; power density; power supplies; quadrature-axis compensation; railgun load; rectifier; short-circuit compensating winding; stator; two-phase armature windings; two-phase two-axis-compensated compulsator; Conductors; Discharges (electric); Inductance; Integrated circuit modeling; Railguns; Rotors; Windings; Electromagnetic launch; compensation; compulsator; pulsed power supply; railgun;
Conference_Titel :
Electromagnetic Launch Technology (EML), 2014 17th International Symposium on
Conference_Location :
La Jolla, CA
DOI :
10.1109/EML.2014.6920617