The difference between DC motor and AC motor
Master formulas n1=60f/P, S= (N1-N), /n1, n= (1-S), 60f/P, and understand their meaning (very important), and be able to flexibly use these formulas for calculations. Also remember: the slip rate of the motor at normal load is approximately SN, 0.01-0.06. The examples in the book should be emphasized.
The construction of three-phase induction motor is also divided into two parts: stator and rotor.(1) stator:The stator is the fixed part of the motor, which is used to produce rotating magnetic field. It is mainly composed of stator core, stator winding and frame.(2) rotor:The rotor is the main part of the rotor. There are two kinds of rotor, squirrel cage and wound rotor. Grasp their respective characteristics and differences. The squirrel cage type motor used for medium and small power (100K or less) is simple in structure, reliable in operation and convenient in operation and maintenance. Winding type can improve startup performance and speed regulation. The air gap between stator and rotor will affect the performance of the motor. The general air gap thickness is between 0.2-1.5mm.Master the wiring method of stator winding.
AC motor is divided into two categories: asynchronous motor and synchronous motor. According to the number of stator phases, asynchronous motors are divided into single induction motors, two-phase asynchronous motors and three-phase asynchronous motors. The three-phase asynchronous motor is widely used in industry and agriculture production because of its advantages of simple structure, reliable operation and low cost.
