1a: If you use a regular micro DC motor (the type used in toys), this is relatively simple. Depending on the different directions of rotation of the rotor, the voltage polarity presented by the two motor pins will be opposite. , so measure the polarity based on the rotation direction of your rotor, then connect it.
1b: For the same motor, different rotation speeds will result in different voltage outputs. Likewise, measure based on your rotation. After the output voltage is obtained, reasonably calculate the current limiting resistor of the LED, and then connect it in series.
2: Performance, for ordinary micro DC motors, this statement does not exist basically not because it does not require processes such as rectification and filtering, there will be almost no output loss, if there is any loss it is mechanical friction loss. In short, no matter how you do it, the effectivenessof the conversion of mechanical energy. in electrical energy will certainly not be greater than its efficiency in the conversion of electrical energy into mechanical energy.
3a: The blue-green is a rechargeable battery, composed of several rechargeable micro-batteries connected in series and then packaged. The rare earth magnet is inside the tube, and the outer surface. You can't see it, but you can see it in the 5th picture.
3b: The principle of power generation is to use magnets to move back and forth in the tube, so that the coil wound outside the tube cuts the magnetic lines of force, so that the coil The voltage is output from both ends and rectified by four diodes, then the battery is charged, and then the switch is lit when needed to light the LED and use it as a flashlight.
The conductors are formed in a magnetic field. Lors the magnetic field lines move, an induced electromotive force is generated. , and with the loop closed, a current is generated.
The phenomenon of induced electromotive force due to changes in magnetic flux When part of the conductor in a closed circuit moves to intersect the magnetic field lines in the magnetic field, a current will be generated in the conductor . . This phenomenon is called electromagnetic induction.
If the surface of the closed coil remains unchanged and the magnetic field intensity is changed, the magnetic flux will also change and electromagnetic induction will also occur. The precise definition is therefore as follows: The phenomenon of induced electromotive force due to changes in magnetic flux.
Detailed informationThe main engine classifications are:
1. Hydraulic motor: It is customary to refer to an energy conversion device that producesa rotational movement and converts the hydraulic energy supplied by a hydraulic pump into mechanical energy.
2. High-speed motor: The gear motor has the advantages of small size, light weight, simple structure, good workmanship, insensitivity to oil contamination, shock resistance and low inertia.
3. Vane motor; This is a hydraulic motor in which the blades of the rotor slot are in contact with the housing (stator ring) and the rotor rotates under the action of the incoming liquid.
4. Radial piston motor: It has good reversing characteristics, which makes the motor operation absolutely silent and is suitable for servo systems.
5. Axial Piston Motor: It is a distributed shaft cycloidal hydraulic motor supported by bearings.
6. Low speed hydraulic motor: simple structure, reliable operationreliable, many varieties and specifications and low prices.
7. Axial piston motor: It is a rolling motorCycloidal hydraulic motor matched with a shaft supported by bearings.
Baidu Encyclopedia - Cutting the movement of magnetic field lines