Hopkinson’s Test of DC Machine is an adaptable training system used for Electrical Laboratory. It is designed to demonstrate the fundamental concepts and also facilitates easy learning about the various losses of DC Machine.

Two similar machines are required to carry out Hopkinson’s Test. Electrically these two machines are connected in parallel to determine the Efficiency of DC Machine by separately calculating the losses. It has been designed in such an easy way that users can observe the voltages and current of windings of both the motors. All protection devices are in built negligible chance of fault or danger.

• Machine with standard electrical loading arrangement through flexible lovejoy coupler
• Machine winding consist of copper for long term service
• Machine Conforms to all leading industrial standards with Class “B/F” Insulation
• Heavy Duty Base/Channel with facility to concrete machine using suitable heavy nuts and bolts
• Provided with contact type Digital speed measuring equipment
• Inbuilt DC Drive of suitable rating with overload protection
• Control panel with digital microcontroller based measuring devices with high accuracy and resolution
• Front board consist of MS Material with power coating to avoid any rust
• Provided with suitable protection such as fuses, MCB, etc wherever requires
• Specially designed BS10 Terminals and patch cords for electrical safety
• Lamp indication for single phase supply
• Earthing screw provided at the back side of the control set-up
• Screen printed diagrammatic representation for the ease of connections.
• Product should be provided with protection fuses, colored patch cords, single phase cords, learning manual having theory operating procedure with connecting diagram, FAQ, Glossary, etc

• Operating Supply of Control Panel           : 230VAC ± 10%, 50Hz
• Machine Specifications
• Both the machines are flexibly coupled and mounted on a “C” Channel base
• Type                                                                      : Shunt
• Rating                                                                   : 0.5 HP to 3HP
• Voltage Rating                                                 : 220VDC ± 10%
• Speed                                                                    : 1500 rpm ± 10% at load
• Insulation                                                            : Class ‘F’
• Winding                                                         : Copper
• Duty                                                                      : Continuous
• Enclosure                                                             : SPDP
• Mounting                                                            : Horizontal foot mounted
• Shaft Extension                                              : Single Sided
• Loading arrangement                                     : Electrical
• Digital Meters used
• DC Voltmeter                                                     : 300V
• DC Ammeter                                                      : 20A (4nos)
• DC Power Supply
• Output Fixed voltage                                       : 200VDC ± 10%
• Output Variable voltage                               : 0 – 240VDC ± 10%
• Current Rating                                                : Based on Power Rating of Machine
• Protection                                                           : Overload Protection
• Digital Tachometer                         
• Range                                                                    : 19,999 rpm
• Type                                                                       :  Contact / Non-contact
• Protection Devices
• MCB (DP)                                                            : 1No
• Glass Fuse                                                           : 3Nos
• Grounding Nut                                                 : Available at the rear side of the panel

• Study and obtain the losses separately and correspondingly. Determine the efficiency of a DC Shunt Machine by Hopkinson’s test