The Power Electronics trainers are part of the Feedback PowerLab range for the study of Thyristor Control Principles and dc Motor Control (including two and four Quadrant control).
Curriculum is provided in the following main subject areas:
Single and three phase uncontrolled rectification
Single and three phase controlled rectification
Single and three phase motor speed and current control
Zero crossing, burst firing circuits
Four Quadrant control
Single and three phase equipment
The dc Motor Control Trainer deals with the motor characteristics and parameters in single and three phase thyristor circuits.
Motor speed and current control circuits may be investigated with various types of feedback, including armature voltage, armature current, tachogenerator and a combination of voltage and current,
PI controllers. Four quadrant control can be implemented for continuous and discontinuous current operation in single and three phase circuits .
Bi-directional load, voltage and current waveforms
Six pulse voltage and current waveforms
Curriculum Coverage
Basic Firing Circuits l Firing Circuit requirements
Basic Motor Control l Single phase half and full wave l controlled bridge
Three phase half and full wave controlled bridge
Advanced Firing Circuits l l
Thyristor phasing
Multipulse firing circuits
Advanced Motor Control l Feedback Measurement l l
Full wave controlled bridge with speed feedback
PI Control l l
Full wave controlled bridge with armature voltage feedback and/or current feedback
Full wave controlled bridge with tachogenerator/feedback
Four Quadrant Control l l
Dual converter – Single Phase
Dual converter – Three phase l l l l l l
Converter selection by error signal
Continuous and discontinuous current operation
Bi-directional speed & current control
Bi-directional control time behaviour
Regenerative braking
Effects of inertia on system performance www.fbk.com Tel: +44 (0) 1892 653322, Fax: +44 (0) 1892 663719, E-mail: feedback@fdbk.co.uk

The Thyristor Control Principles trainer provides extensive training in the principles of thyristor control circuits, and can be used as the basis of a programme, starting with the principles of uncontrolled rectification and simple control using thyristors, progressing through single and three phase controlled rectification and their associated firing circuits.
The characteristics of the various thyristor circuits are studied in conjunction with inductive, capacitive and resistive loads.
ac voltage & current wavefroms
Resistive load
Inductive
Inductive
Curriculum Coverage
Uncontrolled Rectification
Circuits l l l
Single phase half and full wave
Three phase half and full wave dc levels
Controlled Rectification Circuits l l l
Single phase half/full wave
Three phase half wave, star supply
Three phase full wave, Fully controlled bridge
Basic Firing Circuits l Firing circuit requirements
Advanced Firing Circuits l Thyristor phasing l Multipulse firing circuits single and Three phase
Thyristor Control Principles (70-002) and the dc Motor Control Trainer (70-005) may be ordered as a complete package (70-003). An upgrade package (70-004) is also available that extends the
Thyristor Control Principles (70-002) to cover the dc Motor Control curriculum.
Safety is of prime concern. The Power supply and modules include overload protection and optional earth leakage breaker. Double insulated, colour coded, shrouded plug leads provide safe and quick interconnections. All units have the means to be bonded to the supply earth.
The frame is constructed of a fibre-composite material which is electrically safe.
Feedback Instruments Limited, Park Rd, Crowborough, E.Sussex, TN6 2QR, England.
Feedback Incorporated, 437 Dimmocks Mill Road, Suite 27, Hillsborough, NC 27278
Tel: 800-526-8783, 919-644-6466, Fax: 919-644-6470, E-mail: info@feedbackinc.com, Website: www.fbk.com
SFC 7.3.2
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Feedback plc 0606