抄録
Classifying the electric equipments and facilities in ships, we find the most of load are rotating machines such as pumps and blowers etc. moved by induction motors, and the other load are lighting equipments and navigation instruments. We studied the influence of voltage and frequency to performance of those equipments. We found that we can calculate the revolution speed under various voltages and frequencies, if we can measure the constant Km/Kl under rated voltage and frequency. Km/Kl is proportional to the ratio of square of revolution speed to load torque. Measuring this constant, we could calculate the change of revolution speed, gantity of flow, head or total pressure and output power of pumps and blowers under various voltages and frequencies. Furthermore, we studied the performance of steering machines and lighting equipments under changing voltage and frequency.
