Fundamentals of Electrical Drives

Fundamentals of Electrical Drives:

Choice of Electrical Drives : Choice of Electrical Drives depends on a number of factors. Some of the important factors are: Steady state operation requirements: Nature of speed torque characteristics, speed regulation, speed range, efficiency, duty cycle, quadrants of operation, speed fluctuations if any, ratings. Transient operation requirements: Values of acceleration and deceleration, starting, braking and reversing performance. Requirements related to the source: Type of source, and its capacity, magnitude of voltage, voltage fluctuations, power factor, harmonics and their effect on other loads, ability to accept regenerated power. Capital and running cost, maintenance needs, life. Space and weight restrictions if any. Environment and location. Reliability. Status of DC and AC …


Electrical Drives Introduction : Motion control is required in large number of industrial and domestic applications like transportation systems, rolling mills, paper machines, textile mills, machine tools, fans, pumps, robots, washing machines etc. Systems employed for motion control are called drives and may employ any of the prime movers such as, diesel or petrol. engines, gas or steam turbines, steam engines, hydraulic motors and electric motors, for supplying mechanical energy for motion control. Drives employing electric motors are known as Electrical Drives Introduction. Block diagram of an electrical drive is shown in Fig 1.1. Load is usually a machinery designed to accomplish a …


Types of Electrical Drives : Types of Electrical Drives has the following major parts: load, motor, power modulator, control unit and source. There are large number of loads and each load has its own specific requirements. Some common aspects to loads are discussed and specific requirements of some common loads in later chapters. Here we examine four Types of Electrical Drives; viz. motors, power modulators, sources and control unit. Electrical Motors Motors commonly used in Types of Electrical Drives are: dc motors–shunt, series, compound and permanent magnet; Induction motors—squirrel-cage, wound rotor and linear; Synchronous motors—wound field and permanent magnet; Brushless dc motors; Stepper motors; …