Abstract
This paper discusses the wound rotor induction motor and variable-frequency drive (VFD) that regulates the stator voltage frequency. The stator and rotor windings are connected to a common electrical circuit. The slip energy of the motor goes to the DC link and feeds the stator winding of the motor. The block diagram of the electric drive, the equivalent circuit and the basic characteristic of the cascade VFD are considered. It is shown that the energy-saving mode with a minimum ratio âstator current/torqueâ is achieved at an angle between vectors of the stator current and the excitation current at the level of 45 degrees. The experimental static mechanical characteristics of the electric drive were obtained. These characteristics provide a limitation of the starting torque.
Highlights
Squirrel-cage induction motors are most widely used in electric drives of industrial mechanisms [1,2,3]
(7â12) dependences of the angle 0 on the stator current relative value I/IN in the cascade variable-frequency drive (VFD) system. From these graphs it can be seen that the greatest ratio of "stator current/torque" is achieved when 0 = 450, which is typical for variable-frequency electric drive systems [23, 24]
In the area of small slips, they coincide with the mechanical characteristics of the induction motor with a shortcircuited wound rotor
Summary
Squirrel-cage induction motors are most widely used in electric drives of industrial mechanisms [1,2,3]. The design of the energy-saving control system for starting the wound rotor induction motor is an important task. Energy losses at the start are large in these electric drive systems. The frequency control systems are the most economical for induction motors [8,9,10,11,12,13,14]. Such systems provide high quality control, while microprocessors are widely used in them [15]. Efficient frequency control can be applied for wound rotor induction motor. It is reasonable to use an additional cascade connection of the stator and rotor of the motor through rectifier and inverter units
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
