Magnetic Reducing Gear's Electromagnetic Torques
Abstract
The article considers a magnetic reducing gear (MRG) with a threephase winding on its stator, which is fed by a static frequency converter in the form of a sinewave current that is in co or counterphase with the winding noload EMF. When being set to operate in this mode, the MRG will produce the maximal values of shaft electromagnetic torques proportional to the stator current. Such reducing gear will be free from rotor stalling phenomena as long as the frequency converter is able to increase its current with a growth of load. The electromagnetic torques of the MRG rotors (with adjustable and nonadjustable reduction coefficients) are due to the stator electromagnetic torque and are rigidly linked with it via constant coefficients. All three torques produced by an MRG with a frequency converter are directly proportional to the stator winding active current. If there is no stator winding active current, the electromagnetic torques produced by the stator and rotors are equal to zero. The electrical channel of such reducing gear can operate as a motor and generator; it can also impart the synchronous condenser properties to the reducing gear.Analytical formulas for calculating the electromagnetic torques of reducing gears with adjustable and nonadjustable reduction coefficients, which have a similar form, are proposed. Experimental values of electromagnetic torques have been obtained for the mockup samples of both reducing gear types and compared with the analytical and numerical analysis data.
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