Troubleshooting Induction Motors
... Fig. 3 – Load Speed-Torque Curve A motor having high LRT, such as defined by the National Electrical Manufacturer’s Association (NEMA) for Design C on small motors, or large motors with less exaggerated high torque curves, will normally have a large dip in torque in the 50-80% speed range. This desi ...
... Fig. 3 – Load Speed-Torque Curve A motor having high LRT, such as defined by the National Electrical Manufacturer’s Association (NEMA) for Design C on small motors, or large motors with less exaggerated high torque curves, will normally have a large dip in torque in the 50-80% speed range. This desi ...
Electromagnetic Induction and Power Transmission
... Electromagnetic induction is the process of generating an electric current by varying the magnetic field that passes through a circuit. Oersted’s discovery that an electric current creates a magnetic field resulted in experimentation that led to Faraday’s discovery of induced currents. Faraday was ...
... Electromagnetic induction is the process of generating an electric current by varying the magnetic field that passes through a circuit. Oersted’s discovery that an electric current creates a magnetic field resulted in experimentation that led to Faraday’s discovery of induced currents. Faraday was ...
electrical drives
... Other processes of energy conversion in Fig 1.1 still attract investigators’ interest. Thousands of different devices, systems and principles where invented, investigated and practically applied during the last century. Some of them were quite complex and expensive because of the indirect conversio ...
... Other processes of energy conversion in Fig 1.1 still attract investigators’ interest. Thousands of different devices, systems and principles where invented, investigated and practically applied during the last century. Some of them were quite complex and expensive because of the indirect conversio ...
Fundamentals of Linear Electronics Integrated & Discrete
... • Small ones used in light dimmer circuits. • Can control series-wound DC motors. • Commutation is “provided free” by the AC current. ...
... • Small ones used in light dimmer circuits. • Can control series-wound DC motors. • Commutation is “provided free” by the AC current. ...
Motors for Makers: A Guide to Steppers, Servos, and Other Electrical
... In this and the following chapter, the primary concern is motion control— making sure the motor turns with a specific angle and/or speed. This book discusses two types of motors intended for motion control: stepper motors and servomotors. I’ll refer to them as steppers and servos, respectively, and ...
... In this and the following chapter, the primary concern is motion control— making sure the motor turns with a specific angle and/or speed. This book discusses two types of motors intended for motion control: stepper motors and servomotors. I’ll refer to them as steppers and servos, respectively, and ...
Fuzzy System for the Detection of Power Quality Performance on
... efficiency decreases. The results indicating the impact of PQ on motor efficiency and the corresponding fuzzy diagnosis of all the 14 cases are illustrated in Table 2. By examining the results, the following conclusions could be reached. 1. Fuzzy Logic approach has its unique advantages and these ...
... efficiency decreases. The results indicating the impact of PQ on motor efficiency and the corresponding fuzzy diagnosis of all the 14 cases are illustrated in Table 2. By examining the results, the following conclusions could be reached. 1. Fuzzy Logic approach has its unique advantages and these ...
Supplemental Protection (Fuses Protectors)
... No.3 for situations where the appliance is marked with both a horsepower rating and an amp rating. For branch circuits which supply a single non-motor operated appliance rated more than 13.3A, the fuse rating shall not exceed 150% of the appliance rating [422.11(E)(3)]. Electric heating appliances u ...
... No.3 for situations where the appliance is marked with both a horsepower rating and an amp rating. For branch circuits which supply a single non-motor operated appliance rated more than 13.3A, the fuse rating shall not exceed 150% of the appliance rating [422.11(E)(3)]. Electric heating appliances u ...
University of Michigan Hospitals and Health Centers Facilities Planning and Development
... All VFD's for motors larger than 5 HP, and/or on systems serving critical loads (as defined in program statement), and/or systems that do not have a means of 100% backup/redundancy shall include full maintenance bypass systems. These bypasses shall be configured to allow operation of the motor in “a ...
... All VFD's for motors larger than 5 HP, and/or on systems serving critical loads (as defined in program statement), and/or systems that do not have a means of 100% backup/redundancy shall include full maintenance bypass systems. These bypasses shall be configured to allow operation of the motor in “a ...
Induction motor
An induction or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.Three-phase squirrel-cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.