PowerLab Dissectible Machines 62-005

The PowerLab Dissectible Machines System is a complete trainer that covers awide range of dc, Single and Three Phase ac motors and generators. The traineris built around the unique Feedback Dissectible Machine, designed to introducestudents to the basic principles of electrical motors and generators.

It is supplied with manuals on CD which provide a step-by-step guide to settingup and carrying out a wide range of assignments.

The trainer includes power supplies, drive and control equipment, loading andinstrumentation that are all provided in the form of panels which mount into apurpose designed bench-standing frame, that can be easily slotted in and outas required.The system provides a dynamic approach to understanding electrical machinesfor a wide range of student and technician engineers.

It gives a step-by-step course of theory and experiment using the versatile andextensive dissectible machine.

The characteristics of the machines that can be assembled closely representthose of their industrial equivalents.

The modular panels that make up the heart of the system are availableseparately, enabling those with power supplies and metering equipment toconfigure a trainer that suits their needs.

The frame is constructed of an advanced, fibre-loaded, rigid plastics materialwhich is electrically insulated for safety.

The Dissectible Machine

The focus of this system is a fully dissectibleexperimental machines kit. This allows overfifty machine assemblies to be built coveringa wide range of ac and dc Single and ThreePhase motor and generator assemblies.The machines that may be assembled use lowvoltages, have protected rotating parts andoperate at relatively low power levels, therebyminimising the risk of accidents. Nominaloperating voltages are 50V dc and 125V ac.

The components of the system include:-

• Baseplate• Frame Ring• Shaft• Fixed and removable bearing housings• Wound Stator• Squirrel Cage Rotor• Hand Crank• Centrifugal Switch• Coupling• Brush Holders and Brushes• Commutator/Slip Rings• Interpoles• Armature Poles and Hub• Field Poles• Armature, Field and Interpole coils• Compound Field Coils• Tools and Hardware

The separate field poles, interpoles, armaturepoles, hub, 12-slot stator and squirrel cagerotor are made from electrical steel laminationsriveted together. Coils are wound fromsynthetic enamel-covered copper wire andwrapped with a strong cloth-base tape.Each has ‘coil finish’ and identification bands.A stainless steel shaft of high corrosion resist-ance is supported plain and self-aligning ballrace bearings. These are held in aluminiumalloy housings fixed to a cast aluminium base-plate. The shaft speed can range from very lowvalues up to 3600 rev/min (for ac machines), or5000 rev/min (for dc machines) according to theapplication.The commutator, slip rings and brush gear areof simple design to facilitate armature assemblyand give good accessibility.A sturdy component storage panel is providedfor easy inventory control.

Machine Assemblies

The following studies and machine assembliesmay be investigated using the system:

• Introductory electromagnetism• Machine operating principles• Elementary ac and dc generators• dc series motor - with and without interpoles• dc shunt motor - with and without interpoles• dc compound motor - with and without

interpoles• dc separately excited generator - with and

without interpoles

• dc series generator - with and withoutinterpoles

• dc shunt generator - with and withoutinterpoles

• dc compound generator - with and withoutinterpoles

• Single Phase ac induction motor, squirrelcage, 2 pole

• Single Phase ac induction motor, squirrelcage, 4 pole

• Single Phase ac series universal motor• Single Phase ac repulsion motor

• Single Phase ac synchronous motor/generator, 2 pole

• Single Phase ac synchronous motor/generator, 4 pole

• Single Phase ac generator, rotating field• Single Phase ac generator, rotating armature

• Three Phase ac induction motor, squirrelcage, 2 pole

• Three Phase ac induction motor, squirrelcage, 4 pole

• Three Phase ac synchronous motor, 2 pole

• Three Phase ac synchronous generator,2 pole

• ac brushless generator• Stepper motors• Shaded pole induction motor• Split field series motor• Dynamic braking of a dc motor• Power factor correction of ac motors• Synchronisation• Synchronous motor characteristics• Pole-changing induction motor• dc shunt motor faults• 4 pole induction motor faults

2

Measuring EquipmentA combination of electronic and moreconventional analogue metering is provided toenable a full range of dc and ac parameters tobe measured.The Electronic Single and Three PhaseMeasurements panel gives digital readout ofsuch parameters as voltage, current, power,kVA, kVAR, kWH, etc.Large scale analogue voltmeters & ammetersare provided for ac and dc readings togetherwith a frequency meter and synchronisinglamps.A hand-held tachometer allows machine speedto be determined and torque is measured by aFriction brake mounted on the machine base.Both are supplied in the package.

Loading EquipmentBoth electrical and mechanical loading devicesare provided in the system.The electrical loading is with variable resistance

The Dissectible Machine continued

loads and a resistor/capacitor unit for ac singlephase and three phase machines.The mechanical loading is by a friction (Prony)brake, which is calibrated for quantitivemeasurement.

CoursewareAll of the equipment is supplied complete withcourseware, which is manual-based, andincludes theoretical information, practicalassemblies, typical results and questions withtypical answers. It is profusely illustrated andgives circuits, step-by-step assemblyinstructions and procedures.

As the courseware for each assembly isstand-alone, users have the ability to selectthose relevant to their particular syllabusrequirements and to create a practical andrealistic workstation to suit courses at anylevel from vocational to graduate engineer.

Curriculum CoverageThe unique character of the DissectibleMachine System enables students to constructand investigate over fifty different machineassemblies. The System may be used for studyover a wide range of topics from the principlesof magnetic circuits and electrical machinetheory through to Three Phase synchronousmachines. By selection from the coursewaresupplied and theassemblies that may beimplemented with thistrainer, users can createa practical and realisticworkstation to suit coursesat any level from vocationalto graduate engineer.

By using a dissectible machinesystem, students are able to seeclearly the component parts ofthe machine and how they areinterconnected, both electricallyand mechanically. They mayassemble machines from thesecomponent parts and theninvestigate the operation andcharacteristics of them. dc Machine components ac Machine components

3

4

A stand-alone unit with built-in field and armaturesupplies to power the Dissectible Machine whenconstructed as a separately excited dc motor.Armature voltage control is provided usingthyristors.Open and closed loop control is possible usingvoltage and current feedback methods.

• All supplies built-in• Speed control with armature voltage or

tachogenerator feedback• Armature current control and IR compensation• Acceleration/deceleration control• Max and min speed controls• Demonstrates loss of field and loss of

tachogenerator feedback• Dynamic braking• System instability (oscillatory motion)• For use with all models of Feedback

Dissectible Machines• Field and Armature supply protection• Maintenance technician relevant

Dissectible Machines System

Description

Two System Frames are provided: one tohouse the equipment panels and the other astorage panel for the components of theDissectible Machine, leads, etc. A range ofoptional panels and accessories is availablefor oscilloscope and computer mounting, etc.

Universal Power Supply 60-105The mains supply required is a 5-wire, 380/415V Three Phase 50/60Hz power systemwith neutral and earth connections.The power supplies in the trainer haveovercurrent circuit breakers and have variablevoltage outputs for dc, Single Phase ac andThree Phase ac.The outputs provided are:• Circuit breaker protection• Comprehensive Power Supply• Three Phase: nominally 0-400V ac line at 4A• 3 x Single Phase: each nominally 0-230V ac

line to neutral at 4A dc nominally 0-270V at 6A• Three Phase 400V line, 230V Single Phase,

fixed dc 220V 10A• Single Phase power distribution• Safety earth connection for all unitsConnections from the power supplies are byleads with 4mm shrouded connectors.

MachineThe package is based on the DissectibleMachine, described earlier.

Variable Speed Drive 63-500A dc Variable Speed Drive is provided.This comprises a 250W motor mounted on abase unit and an electronic motor driveproviding the motor supply. The shaft speedrange is from zero to 4,000 rev/min and has allcontrols and fuses are accessible externally.It has current limiting, electronic control forgood regulation and soft-start.

Control Switches 63-130• A panel of heavy duty power switches is

provided to allow multipoint metering,component selection and motor speedchanging

• The switches are rated at 240V ac, 10A

Dissectible Machinesdc Motor Speed Controller 66-121

5

Utilities

System Frame 91-200• Made from a fibre glass composite, non-

conductive material• Easy 'lift in/out' panel removal• Maximises bench space• Provides clear view of multi-panel experiments

Dissectible Machines Storage System90-100This storage system holds all the coils andcomponents. The system may be securelycoupled to the main frame and has clearlyidentified positions for components togetherwith two bins for further storage.This provides easy inventory control.

Storage Bin 91-240• Holds leads and tools associated with the

System• Can be used in either landscape or portrait

format

• Voltage ranges 0-50, 0-250 & 0-500V ac• Current ranges 0-1A, 0-5A & 0-10A ac• Ammeter ranges are fuse protected

Synchronising Lamps 68-120• Basic synchronising by Phase indicator

lamps grouped in a triangle• Uses either lamps-bright or lamps-dark

technique• A power switch is provided to connect the

systems together• Can accommodate Three or Single Phase

ac Voltmeter & Frequency Meter 68-121• Used in the study of synchronous generators ·• Three Phase supply measurements• Ideally suited to the application of

synchronising generators and supplies

Optical/Contact Tachometer 68-470• Versatile measuring of shaft speed• Non-contact by photo sensing• Direct shaft contact through conical

rubber drive• Measurement range 99,999 rev/min

non-contact, 20,000 rev/min contact

Dissectible Machines System continued

Loading Equipment

Friction (Prony) Brake 67-470

• Fits directly onto the shaft of the machine• Provides direct loading with integral

measurement of the torque output of themotor assemblies under test

• Indicates torque output in either directionup to ±2Nm

Resistor/ Capacitor Unit 67-190• Low Power resistive/reactive component unit,

for loading ac motor starting and dc powersmoothing

• Resistive elements 3 x 68 ohms, 50W each• Capacitive elements:- 2µF, 4µF, 8µF & 10mF• Capacitors 400V (63V for 10mF)

Variable Resistance 67-113High power variable resistance element foruse where short term dissipation is required inapplications such as:• Generator loading• Motor starting• Motor speed control applications

MeasurementsElectronic Single & Three Phase 68-100• Measures all the parameters on 3 or 4 wire,

balanced, Three Phase systems.Including: voltage, current, power factor,watts, KVA, KVAR, KWH etc.

• Unit is rated at 750V ac 5A per phase.

dc Voltmeter & Ammeter 68-110• Moving coil dc voltmeter• Voltmeter ranges 0-50, 0-250, and 0-500V dc• Ammeter range 0-1A, 0-5A and 0-10A dc• Ammeter is fuse protected• Meters are to DIN standard 96 x 96mm

dc Milliammeter, Centre Zero 68-113Ideal instrument for use in:-• Electrical circuit investigations• Motor/generator set-ups• Provides direct indication of polarity and

polarity reversal• Ranges: ±1mA, ±1A and ±5A• Meters are to DIN standard 96 x 96mm

Rectifier Voltmeter/Ammeter 68-117• Ideally suited to ac measurements over awide range of voltages and currents with goodaccuracy

Dissectible Machines Components 62-110This Tutor provides the basic dissectible machinescomponents as described in ‘The DissectibleMachine’ section at the beginning of this document.It is intended for use where there are already powersupply, drive, loading and measuring instrumentsavailable. Included in this package are the Resistor/Capacitor unit and the Control Switches panelproviding the basic elements of electrical loads andelectromechanical control.

Control Switches• Component selection• Changing motor speed

Switches are:- 1 x 3way,3 x 1way, 1 x 4waySwitch ratings 240V ac l0A

Resistor/Capacitor Unit• Low power resistive/

reactive component unit• Resistive elements 3 x 68W• Capacitive elements:-

2µF, 4µF, 8µF and 10mF• Nominal ratings

Resistance 50W eachCapacitors 400V(63V for 10mF)

Dissectible Machines Components & Accessories

Dissectible Machines Storage Panel 62-101• Holds coils and components for the

Dissectible Machine• Provides easy inventory control• Clearly identified positions for components• Can be mounted in a System Frame,

or wall-mounted.

Rotatable Brush Gear 62-102• Replaces the Dissectible Machine static

brush gear• Easily fitted to the non-drive-end bearing

mounting• Can be rotated to any angle with respect to

the neutral axis• Scale calibrated in 5° increments• Thumbscrew locking

Friction (Prony) Brake 67-470• Fits directly onto the shaft of the Feedback

range of machines• Provides direct loading with integral

measurement of the torque output ofvarious motor assembles

• Indicates torque output in either directionup to ±2Nm

6

4mm Patch Leads 68-800• For interconnections between panels and

bench mounted equipments.• Leads are fitted with 4mm stackable

shrouded safety connectors & made fromdouble insulated cable.

This storage system holds all the leads, coils andcomponents for the Complete Dissectible MachinesSystem. The system has clearly identified positions forcomponents together with three storage bins for furtherstorage. This provides easy inventory control.

The System comprises:• The Dissectible Machines Storage Panel 62-101• Machines Frame 91-200• Three Storage Bins 91-240• Lead Storage 91-245

Option - Oscilloscope/Computer housing 91-210

Dissectible Machines Storage System 90-100

7

Park Rd, Crowborough, East Sussex,TN6 2QR, England.Tel: +44 (0) 1892 653322Fax: +44 (0) 1892 663719E-mail: feedback@fdbk.co.ukWebsite: www.fbk.com

For further information on Feedback equipment please contact: . . . . . . . .

Dissectible Machines - 4 Printed in England by FI Ltd, Crowborough 0105

Feedback reserves the right to change these specifications without notice. Registered in England number 990620. A subsidiary of Feedback plc.

Complete Dissectible MachinesSystem 62-005

Comprises:

Universal Power Supply 60-105

Variable ac/dc Supply 5A 60-121

Dissectible Machines Tutor *62-100

Variable Speed Drive 63-500

Control Switches *65-130

Variable Resistance 200W 3A 67-113

Resistor Capacitor Load Unit *67-190

Friction (Prony) Brake 67-470Electronic Single and Three PhaseMeasurements 68-100

dc Voltmeter and Ammeter x2 68-110

dc Milliammeter Centre Zero 68-113

Rectifier Voltmeter/Ammeter 68-117

Synchronising Lamps 68-120

ac Voltmeter and Frequency Meter 68-121

Digital Optical/Contact Tachometer 68-470

Patch Leads 68-800

Dissectible Machines Storage SystemFrame 91-100

* Items supplied as 62-110

Optional Equipment for 62-005

Oscilloscope/Computer Housing 91-210

Storage Bin 91-240

Earth Leakage Breaker Three Phase 60-140-1

(recommended where earth leakage protection

is not part of the laboratory supplies installation).

Ordering InformationPlease quote the following product namesand numbers when ordering equipment:

Dissectible Machines System 62-005(230/400V operation)

Dissectible Machines System 62-035(120/208V operation)

Additional Dissectible Machinesitems available are:

Dissectible Machines Components 62-110includes Control Switches & Resistor/Capacitor Unit

Dissectible Machines Storage Panel 62-101

Rotatable Brush gear 62-102

Friction (Prony) Brake 67-470

dc Tachogenerator and Mount 68-432

Standard set of Patch Leads 68-800

Dissectible Machines Storage System 90-100

Oscilloscope/Computer Housing 91-210

Storage Bin 91-240

System Frame 91-200