Electrical Machinery Principles Operation And Management
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199. The power-factor, therefore, is the ratio of the line; 1, 5 to 1, 3, or the ratio of the energy component of the current to the total current and this can be roughly estimated as shown.
304. Loss of Efficiency of an Induction Motor at Reduced Speeds. * When an induction motor is operated at reduced speeds by increasing the- slip, as by increasing the secondary resistance or decreasing the primary voltage, the efficiency is lowered by an amount nearly proportional to the speed reduc- tion, ...as expressed by the formula: (57) E 2 = E, -- (efficiency) * B. G. Lamme, National Electric Light Association Convention, Niagara Falls, June, 1897, 196 ELECTRICAL MACHINERY [ART. 305 in which EI = the efficiency of the motor when running at a given torque and a slip Si. E 2 = the efficiency when the motor is developing the same torque but with a different slip $2, efficiencies and slips being expressed in per cent.
EXAMPLE. Suppose a given 60-cycle, 8-pole motor with a synchronous speed of 900 r.
What to read after Electrical Machinery Principles Operation And Management?
You can find similar books in the "Read Also" column, or choose other free books by Terrell Croft to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
199. The power-factor, therefore, is the ratio of the line; 1, 5 to 1, 3, or the ratio of the energy component of the current to the total current and this can be roughly estimated as shown.
304. Loss of Efficiency of an Induction Motor at Reduced Speeds. * When an induction motor is operated at reduced speeds by increasing the- slip, as by increasing the secondary resistance or decreasing the primary voltage, the efficiency is lowered by an amount nearly proportional to the speed reduc- tion, ...as expressed by the formula: (57) E 2 = E, -- (efficiency) * B. G. Lamme, National Electric Light Association Convention, Niagara Falls, June, 1897, 196 ELECTRICAL MACHINERY [ART. 305 in which EI = the efficiency of the motor when running at a given torque and a slip Si. E 2 = the efficiency when the motor is developing the same torque but with a different slip $2, efficiencies and slips being expressed in per cent.
EXAMPLE. Suppose a given 60-cycle, 8-pole motor with a synchronous speed of 900 r.
What to read after Electrical Machinery Principles Operation And Management?
You can find similar books in the "Read Also" column, or choose other free books by Terrell Croft to read onlineMoreLess
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