[en] Describes induction motors having an outer squirrel-cage or slip-ring rotor driving the shaft, and an inner, free-running rotor with the function of compensating the reactive load of the stator. Investigates theoretically the suggestion that a superconducting inner rotor would also produce very high excitation, and enable the iron circuits to be dispensed with. (R.W.S.)

[en] This is a drive for systems rotating at high speed, e.g. for gas ultra centrifuges, which when used in large plant creates an energy conversion system to the motor, having appreciably lower conversion losses and also shows a lower harmonic content in the motor current. (orig.)

[en] A rotor flux state observer considering iron loss, for an Induction Motor (IM), is proposed. The aim of this proposal is to avoid detuning caused by the IM iron loss on a field-oriented control (FOC). An adaptive scheme for the K_Fe, a parameter that represents the IM iron loss, is also proposed. The main objective of this scheme is to improve the dynamic response of control by compensating the variations of iron losses due to possible variations in the stator core characteristics. Simulation results demonstrated that the observer and the adaptive scheme showed a good performance fulfilling then the objectives

[en] A conceptual design is presented for a nanoengine governor based on the end interfacial effect of two rotary nanotubes. The governor contains a thermal-driven rotary nanomotor made from double-walled carbon nanotubes (DWCNTs) and a coaxially laid out rotary nanotube near one end of the nanomotor rotor. The rotation of the rotor in the nanomotor can be controlled by two features. One is the stator (the outer tube of DWCNTs) which has some end atoms with inward radial deviation (IRD) on the stator. The other is the relative rotation of the neighboring rotary tube of the rotor. As the configuration of the stator is fixed, the end interfacial interaction between the two rotors will govern the dynamic response of the rotor in the nanomotor system. The obtained results demonstrate that the relative rotational speed between the two rotors provides friction on the rotor in the nanomotor system. In particular, higher relative rotational speed will provide lower friction on rotor 1, which is opposite to that between neighboring shells in DWCNTs. (paper)

[en] A detailed component development program is followed in which the critical components necessary to achieve superconducting generators for central power plant applications are discussed. The stator concept is described and illustrated. Its development is described and the armature bar and assembly are illustrated. Future (1981) tests are projected. The overall design of the 20-MVA superconducting generator is summarized in two tables, one of principal dimensions and the other of computed parameters

[en] BBC build turbo-generators with full liquid cooling for large nuclear power stations. The stator and rotor are cooled with water and the laminated core with oil. The rotor and stator space which are separated by an air-gap cylinder, contain nitrogen. The author describes the cooling principle and construction features. (orig.)

[en] The shutdown of Trillo NPP due to an irreparable in situ fault in the stator of the electric generator, has resulted in the need to transport a spare stator from Mulheim (Germany) to Trillo I NPP (Spain). The problem occasioned by this type of transport have been exacerbated by the very short period of time available to plan and carry out this operation. Owing to this pressing need, the logistics of the transport were tackled from all possible alternative approaches. Within each one of these alternatives, all available modes were considered, so as to minimise the possibility of an insurmountable difficulty arising and thus making it impossible to continue with trans transportation. The two basic alternatives considered were road and rail. This paper describes the different aspects which intervened in this special transport, especially the following: - The very short time period available for planning and execution - The railway transport mode used - The large number of organisations participating in the operation - The solution to the technical problems caused by the use of different types of transportation equipment - The studies, adaptations and improvements carried out on the different routes - The coordination of the resources used in the operation. (Author)

[en] The efficiency of linear as well as rotational electric drives can be improved by filling the gap between the acting magnets (rotor, stator) with a ferrofluid. This reduces the magnetic resistance and thus amplifies the driving force. Results of calculations and measurements of this amplification effect are presented and compared here

[en] The rotation transmission system (RTS) made from co-axial multi-walled nanotubes (MWNTs) has the function of regulating the input rotation from a nanomotor. The mechanism for the regulation is that the friction among the tubes during rotation governs the rotation of the rotors in the nanosystem. By integrating a rotary nanomotor and a nanobearing into an MWNT-based RTS, it is discovered that the stator (outer tube) provides relatively greater friction on the rotors by penetrating the motor tube, which has a higher stable rotational frequency. And the output rotation of the rotors in the system depends significantly on the temperature of the system, as the rotor tubes are slightly longer than the motor tube. Briefly, at low temperatures, say 8 K, the rotors rotate synchronously with the motor. However, at high temperatures, the rotors rotate slower than the motor with a bigger difference between their rotational frequencies. Hence, the output rotational frequencies can be adjusted by changing the temperature as well as the input rotational frequency. (paper)

[en] The features of operation of electromagnetic vibration tables are analyzed. It is shown that the widely utilized diode connection of a feed of two-stroke electromagnetic vibrators leads to excitation of polyharmonic vibrations and limits their use in tests of products for sine wave vibration. We offer to indemnify a constant component in the mechanical movement of the platform of a vibrating stand at the expense of the counter connection of the windings of a two-stroke electromagnetic vibration exciter