05-11-2012, 04:43 PM
INDUSTRIAL DRIVES and APPLICATIONS
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An Introduction to Electrical drives & its dynamics: Electrical drives. Advantages of electrical drives. Parts of electrical drives, choice of electrical drives, status of dc and ac drives, Dynamics of electrical drives, Fundamental torque equation, speed torque conventions and multiquadrant operation. Equivalent values of drive parameters, components of low torques, nature and classification of load torques, calculation of time and energy loss in transient operations, steady state stability, load equalization.
Components in electric drives
Motors
DC motors - permanent magnet – wound field
AC motors – induction, synchronous (IPMSM, SMPSM), brushless DC
Applications, cost, environment
Power sources
DC – batteries, fuel cell, photovoltaic - unregulated
AC – Single- three- phase utility, wind generator - unregulated
Control unit
Complexity depends on performance requirement
analog- noisy, inflexible, ideally has infinite bandwidth.
digital – immune to noise, configurable, bandwidth is smaller than the analog controller’s
DSP/microprocessor – flexible, lower bandwidth - DSPs perform faster operation than microprocessors (multiplication in single cycle), can perform complex estimations
Overview of AC and DC drives
DC motors: Regular maintenance, heavy, expensive, speed limit
Easy control, decouple control of torque and flux
AC motors: Less maintenance, light, less expensive, high speed
Coupling between torque and flux – variable spatial angle between rotor and stator flux
[attachment=38213]
An Introduction to Electrical drives & its dynamics: Electrical drives. Advantages of electrical drives. Parts of electrical drives, choice of electrical drives, status of dc and ac drives, Dynamics of electrical drives, Fundamental torque equation, speed torque conventions and multiquadrant operation. Equivalent values of drive parameters, components of low torques, nature and classification of load torques, calculation of time and energy loss in transient operations, steady state stability, load equalization.
Components in electric drives
Motors
DC motors - permanent magnet – wound field
AC motors – induction, synchronous (IPMSM, SMPSM), brushless DC
Applications, cost, environment
Power sources
DC – batteries, fuel cell, photovoltaic - unregulated
AC – Single- three- phase utility, wind generator - unregulated
Control unit
Complexity depends on performance requirement
analog- noisy, inflexible, ideally has infinite bandwidth.
digital – immune to noise, configurable, bandwidth is smaller than the analog controller’s
DSP/microprocessor – flexible, lower bandwidth - DSPs perform faster operation than microprocessors (multiplication in single cycle), can perform complex estimations
Overview of AC and DC drives
DC motors: Regular maintenance, heavy, expensive, speed limit
Easy control, decouple control of torque and flux
AC motors: Less maintenance, light, less expensive, high speed
Coupling between torque and flux – variable spatial angle between rotor and stator flux