2.1 Effects and Development of Machine
What is Electrical Machine? ----------An Electrical machine is a device that converts mechanical energy to electrical energy or vice versa, and changes AC voltage from one level to another level according to law of electromagnetic induction.
The British Hopkinson also invented a transformer with closed magnetic circuit.
Bullough invented high voltage oil immersion transformer, which makes long-distance high-voltage transmission a reality.
2.1 Effects and Development of Machine
Effects of Machine
Power production, transmission and distribution Generator Transformer
……
Drive machinery and
equipment Motor
1888
Faraday invented the model of the first induction generator.
Jacobi invented rod core motor which power is 15W.
Davenport first tried to use motors to drive machines.
The British Gordon created a large two-phase AC generator.
The French Gauland and the British John Gibbs successfully developed the first practical transformer.
Edison created large DC generator named “big elephant”.
Ferraris proposed rotating magnetic field principle, and developed a two-phase asynchronous motor.
Machine and Electric Appliance & Control Technology
2.1 Effects and Development of Machine 2.2 Classification and Structure of Machine 2.3 Application Fields of Machine 2.4 Selection and Operation Control of Machine 2.5 Research Contents of Electro-mechanics 2.6 Development of Electric Appliance 2.7 Classification of Electric Appliance 2.8 High Voltage Electric Appliance 2.9 Low Voltage Electric Appliance
application
DC Motor AC Motor
The functions in application
Generator Motor
Transformer Converter
Frequency converter Phase modifier Control motor
Russians made a single three-phase AC squirrel cage induction motor
2.1 Effects and Development of Machine
1882 1882 1882 1884 1891
The British Fee Langdi improved AC generators and put forward the concept of AC high voltage transmission.
2.2 Classification and Structure of Machine
1.Classification-sized motor Small and medium-
sized motor Micro-motor
The current types in
Machine tool Pump ……
Control motor Valve control Gun control
Computer ……
2.1 Effects and Development of Machine
1831 1834 1836 1845
1866
1870 1878
1880 1885
Gramme made the ring armature self-excitation generator.
Core grooving method was invented. The structure with Slotted core and drum winding are still in use now.
Wheatstone made the first electromagnetic generator by replacing permanent magnet for electromagnet.
Siemens made the first self-excitation generator using electromagnet.