Tiêu đề Motors and Drives.pdf ✅

4/25/22 2 Audit Considerations Organization: • Policies on design, purchase, use and operations • Organization in charge of policy implementation • Operation – loading, duty, application, set-points, production requirements • Maintenance – requirements, logs, performance trend, incidences, etc. Take note of: • Required standards, guides and practices to ensure efficiency and reliability • Their energy use, impact to operation, finance, and productivity • Identify energy savings measures for motors and drives systems; opex-capex trade offs for efficiency improvements 3 Electric Motors 4
4/25/22 3 (Motors are governed by these equations) AC Motor Power Equation Essentials 5 About Motors 6
4/25/22 4 DC Motors Direct Current - DC Motors • DC motors have excellent speed control and the ability to provide high torque at various speed levels • DC motors are also excellent choices in applications in which the motor is supplied by a DC bus as part of an uninterruptible power system • Often used in the transport industry • Getting popular with battery storage (EVs) with renewable energy scenarios 7 Electronically Commutated Motors • These are recent development and are a hybrid of a DC motor and 3-phase motor • A circuit generates a DC output that is electronically switched to different phases of an electric motor, generating a rotating magnetic field on the stator. The rotor is typically a permanent magnet for smaller sizes • Speed determined by electronic switching frequency thru microprocessor inverter EC Motor 8