SECTION 4 ELECTRIC MOTORS UNIT 20 TROUBLESHOOTING
... – Can result in oxidation on electrical contacts – Oxidation increases circuit resistance – Resistance increases the amount of heat generated – Can result in low voltage being supplied to the motor – Low voltage can result in increased motor amperage ...
... – Can result in oxidation on electrical contacts – Oxidation increases circuit resistance – Resistance increases the amount of heat generated – Can result in low voltage being supplied to the motor – Low voltage can result in increased motor amperage ...
Numerical Methods
... model of the electromagnetic torque Te (or power) that is required in the swing equation to obtain the accelerating torque. This simple model was based on the assumption that there are no dynamics associated with the machine internal voltage. This is not true. We now want to construct a model that w ...
... model of the electromagnetic torque Te (or power) that is required in the swing equation to obtain the accelerating torque. This simple model was based on the assumption that there are no dynamics associated with the machine internal voltage. This is not true. We now want to construct a model that w ...
Engineering Letters
... However, operating flux density in stator teeth and core increases, which results into higher iron losses. Thus reducing the efficiency and raising the temperature rise of the machine. With improvement in magnetic materials, it is possible to choose comparatively higher value of flux density in mode ...
... However, operating flux density in stator teeth and core increases, which results into higher iron losses. Thus reducing the efficiency and raising the temperature rise of the machine. With improvement in magnetic materials, it is possible to choose comparatively higher value of flux density in mode ...
Modeling of the Starting Performance of Large Solid-Pole Synchronous
... Most parameters in the equivalent circuit can be derived from the magnetic circuit analysis [18] or FEA [27]. There is no damping winding on the rotor of solid-pole machines, and the rotor poles consist of the solid conductive bodies. Therefore, the torque in solid pole motors is developed by the ed ...
... Most parameters in the equivalent circuit can be derived from the magnetic circuit analysis [18] or FEA [27]. There is no damping winding on the rotor of solid-pole machines, and the rotor poles consist of the solid conductive bodies. Therefore, the torque in solid pole motors is developed by the ed ...
COMPARISON OF SCALAR AND VECTOR CONTROL
... In this paper two control methods are compared: scalar control and vector control. Scalar control is a relatively simple method. The purpose of the technique is to control the magnitude of the chosen control quantities. At the induction motor the technique is used as Volts/Hertz constant control. Ve ...
... In this paper two control methods are compared: scalar control and vector control. Scalar control is a relatively simple method. The purpose of the technique is to control the magnitude of the chosen control quantities. At the induction motor the technique is used as Volts/Hertz constant control. Ve ...
Induction Motor - ENCON - Department of ENergy CONversion
... Easy to manufacture Almost maintenance-free, except for bearing and other “external” mechanical parts ...
... Easy to manufacture Almost maintenance-free, except for bearing and other “external” mechanical parts ...
2 marks EC2201
... 22.How will you change the direction of rotation of d.c.motor? Either the field direction or direction of current through armature conductor is reversed. 23. What is back emf in d.c. motor? As the motor armature rotates, the system of conductor come across alternate north and south pole magnetic fie ...
... 22.How will you change the direction of rotation of d.c.motor? Either the field direction or direction of current through armature conductor is reversed. 23. What is back emf in d.c. motor? As the motor armature rotates, the system of conductor come across alternate north and south pole magnetic fie ...
Training: How Often Is Enough
... What types of trending data should be gathered, and how often? When it comes to data collecting, “trend is your friend.” Using software and testing equipment that can analyze both dynamic and static data a detailed history can be obtained for a motor that shows potential problems before a catastroph ...
... What types of trending data should be gathered, and how often? When it comes to data collecting, “trend is your friend.” Using software and testing equipment that can analyze both dynamic and static data a detailed history can be obtained for a motor that shows potential problems before a catastroph ...
Electric Motor
... electric motor, these attracting and repelling forces create rotational motion. A motor is consist of two magnets. ...
... electric motor, these attracting and repelling forces create rotational motion. A motor is consist of two magnets. ...
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.