ABSTRACT
The application of a correct motor to a given machine is a joint effort between the electrical and mechanical engineers. This chapter provides more coverage for the application of medium- and large-sized motors. The motor is accelerated through a frequency converter, and upon reaching the system frequency, the motor is transferred to the network. The motor-starting torque can be shaped to suit the load characteristics. Two types of drives — load commuted inverter and pulse-width modulation — are used. The torque required to accelerate the drive train at any point on the speed—torque curve is the difference between the motor torque and the load torque. The inertia of a load and its speed—torque characteristic determine the acceleration torque required to bring the load up to speed. Data on motor-starting power factor is required for the evaluation of motor performance during acceleration and for harmonic analysis.
