Читать книгу Analysis and Control of Electric Drives - Ned Mohan - Страница 21

In addition to energy savings, there are many electromechanical systems where it is important to precisely control their torque, speed, and position. Many of these systems, such as elevators in high‐rise buildings, we use on a daily basis. Many others operate behind the scene, such as mechanical robots in automated factories, which are crucial for industrial competitiveness. Even in general‐purpose applications of ASDs, such as pumps and compressors systems, it is possible to control ASDs in a way to increase their energy efficiency. Advanced electric drives are also needed in wind‐electric systems to generate electricity at variable speed. Hybrid‐electric and electric vehicles represent an important application of advanced electric drives in the immediate future. In most of these applications, increasing efficiency requires producing maximum torque per ampere, as will be explained in this book. It also requires controlling the electromagnetic torque, as quickly and as precisely as possible. As illustrated in Fig. 1-6, the load torque T_Load may take a step‐jump in time, in response to which the electromagnetic torque produced by the machine T_em must also take a step‐jump if the speed ω_m of the load is to remain constant.

Fig. 1-6 Need for controlling the electromagnetic torque T_em.