Junior high school physics electromagnetics teaching instrument hand-cranked three-phase AC and DC generator
1. Purpose: Demonstrate the generation of three-phase AC and DC generators and the connection of three-phase circuits, and can be used as a low-power low-voltage three-phase power supply.
2. Technical features: The excitation voltage is 6V, the speed is 1500 rpm, and the output frequency is 25HZ.
1. No-load output phase voltage is not less than 10V.
2. The load output phase voltage is not less than 10V, and the load output line voltage is not less than 16V.
3. The output power is not less than 7VA.
3. Structure:
1. Generator
(1) The rotor winding is connected to an external power supply through the collector ring brush, and is excited by DC. The current should be between 4.5-6V.
(2) The three coils of the stator winding are bundled with red, yellow, and green silk cloths to distinguish them.
(3) The terminal board with six connection posts is the output terminal of the generator, which can be connected to star (Y) or delta (△) connection output.
2. Load board
(1) Star connection method (Y) load board. The three lamp sockets on the layout are connected in a star shape, and the common end is connected to the fourth lamp socket. For demonstration, when the three phases are not parallel, there is current through the neutral line. The star load board can demonstrate two connection methods of three-phase six-wire system and three-phase four-wire system.
(2) Delta connection (△) load board. The three lamp sockets on the board are connected in a triangle shape.