a set of devices for starting an internal-combustion engine; in general, it consists of a power-producing device, a source of energy, and a connecting-system. The starting system for a gas-turbine aircraft engine includes a starter, a source of energy, that is, a fuel supply system that...
Starting torque and current are considerably lower at star-delta starting than at direct-on-line starting: one third of the equivalent DOL value. Mismatching of motor torque speed curve and load torque speed curve. In the example shown here, the motor would slowly accelerateup to approximately ...
current value I exceeds a predetermined value IH, and the preset voltage value in the next step is calculated at the same time according to the pressure-raising curve; and an electric motor is switched over to closed-loop operation when the current converting frequency is greater than the ...
In the course of the evolution of the organic world, pain was transformed into a danger signal; it became an important biological means for saving the life of an individual and, consequently, of a species. Pain mobilizes the body’s defenses to eliminate the painful stimuli and restore the ...
The time curve of the electric voltage (u(t)) and the resulting flow of electric current (i(t)) is measured at the terminals of the asynchronous motor. The measurement values of current and voltage are fed in to the processor and the vol... FWP Garbrecht 被引量: 5发表: 1994年 ...
aAs a large rotor resistance, the torque curve shown in Figure 3, curve 1, with ordinary asynchronous motor torque curve than 2, a marked difference. It will enable the critical slip S0> 1, so that not only the torque characteristics (mechanical properties) is closer to linear, and has a...
it has such a high temperature that the resistance then obtaining will keep the current adequately small in the starting branch. Recommended PTC resistors are those of which the resistance temperature curve has a flat section below a limiting temperature and a steep section above this limiting tempe...
applied voltage V by a small angle, while the current Im passing through the main winding lags behind the applied voltage V, by a very large angle. Phase angle between Is and Im is made as large as possible, because the starting torque of a split-phase motor is proportional to sin α....
overload protection of motor operation and the factory default value is 3; Level 9~16 is used in the thermal overload protection of motor start and the factory default value is 0 (close protection; no matter what kind of start mode, there is already protection on star...
a limited allowable current and the required short time to reach the full speed. Consequently, the motor is designed so that its performance at normal full-load running conditions is a compromise. In some instances expensive hydraulic controls are employed to delay the imposition of the load torqu...