Upgrading the Rotor Ground Fault Protection on Electric Generators
... First generation non-contact ground detectors became available several decades ago and replaced slip ring connections with primitive optical or radio frequency communication off the rotor, but they are still go/no go alarms and have life and reliability limitations. THE ACCUMETRICS’ EFREM In 2005, A ...
... First generation non-contact ground detectors became available several decades ago and replaced slip ring connections with primitive optical or radio frequency communication off the rotor, but they are still go/no go alarms and have life and reliability limitations. THE ACCUMETRICS’ EFREM In 2005, A ...
Elec467 Power Machines & Transformers
... direction if caused by motor action would have current flowing from X to X’ and flux bunching occurring on the left side of the conductor. Assume there is zero current flow at the start. Since the movement source was mechanical, the reaction of the conductor is opposite and seeks to oppose the movem ...
... direction if caused by motor action would have current flowing from X to X’ and flux bunching occurring on the left side of the conductor. Assume there is zero current flow at the start. Since the movement source was mechanical, the reaction of the conductor is opposite and seeks to oppose the movem ...
Experiment No. 1 Study of Separately
... A dc Motor/Generator can run either as a motor or as a generator. A motor converts electrical power into mechanical power while a generator converts mechanical power into electrical power. A generator must, therefore, be mechanically driven in order to produce electricity. Since the field winding is ...
... A dc Motor/Generator can run either as a motor or as a generator. A motor converts electrical power into mechanical power while a generator converts mechanical power into electrical power. A generator must, therefore, be mechanically driven in order to produce electricity. Since the field winding is ...
Tuning the P700VC in Sens Vector and FVC
... Tuning the drive to the motor is extremely important. The purpose of Autotune is to identify the correct motor flux and stator resistance. This will ensure higher starting torque and better performance at low speed operation. An improperly tuned drive can cause the motor to exhibit instability at lo ...
... Tuning the drive to the motor is extremely important. The purpose of Autotune is to identify the correct motor flux and stator resistance. This will ensure higher starting torque and better performance at low speed operation. An improperly tuned drive can cause the motor to exhibit instability at lo ...
THE FUNDAMENTALS OF AC ELECTRIC INDUCTION MOTOR
... form similar to that of the stator winding. The winding terminals are brought out to three slip rings. This allows an eternal threephase resistor to be connected to the rotor winding for the purpose of providing speed control. The squirrel-cage winding consists merely of a number of bars imbedded in ...
... form similar to that of the stator winding. The winding terminals are brought out to three slip rings. This allows an eternal threephase resistor to be connected to the rotor winding for the purpose of providing speed control. The squirrel-cage winding consists merely of a number of bars imbedded in ...
Stepper motor controllers have full/half step mode for different
... Onboard memory will not be used. Expanded mode will be enabled so HC11 reads from external memory. ...
... Onboard memory will not be used. Expanded mode will be enabled so HC11 reads from external memory. ...
Spindle Drive System Troubleshooting
... at Spindle Off or during deceleration. Disconnect REGEN wires and check the OHM value of resistor. Value must not be zero (open). ...
... at Spindle Off or during deceleration. Disconnect REGEN wires and check the OHM value of resistor. Value must not be zero (open). ...
Answers Electrical Motor Controls Chapter 4
... 7. What should be done with silver-oxide contacts that appear tarnished? Nothing 8. What is indicated by heavy dark lines, thin lines, and dashed lines on a wiring diagram? Power circuit, control circuit, and user connections 9. What is a mechanical interlock for a manual starter? Contacts arranged ...
... 7. What should be done with silver-oxide contacts that appear tarnished? Nothing 8. What is indicated by heavy dark lines, thin lines, and dashed lines on a wiring diagram? Power circuit, control circuit, and user connections 9. What is a mechanical interlock for a manual starter? Contacts arranged ...
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.