Disadvantages Of Dc Motors

2.4 DC Motors

Fig. 2.4.1 DC Motor

DC motor is an electrical machine that converts the direct current electrical power into mechanical power. Most of the DC motors depends on the forces produced by magnetic fields. All types of DC motors have some internal mechanism, either electromechanical or electronics, to periodically change the direction of current flow in part of the motor. Most types produce rotary motion; a linear motor directly produces force and motion in a straight line. A DC motor's speed can be controlled over a wide range, using either a variable supply voltage or by changing the strength of current in its field windings. Small DC motors are used in tools, toys, and appliances. The torque equation of a DC Motor can be further simplified as:

Where, P is no of poles, φ is flux per pole, Z is no. of conductors, A is no. of parallel paths, and N is the speed of the D.C. motor.

Fig 2.4.2 High Torque Motors

High torque DC motors are required for this project. Cheap E-Bike motors are used with high torque. These motors are of 24V, 350W rating with the key features:

1. 24 volt 350 watt

2. 9 tooth 1/8" bicycle chain sprocket

3. Left or right rotation by reversing wires

4.

Lithium ions move from the anode to the cathode during discharge and are intercalated into (inserted into voids in the crystallographic structure of) the cathode. The ions reverse direction during charging. Since lithium ions are intercalated into host materials during charge or discharge, there is no free lithium metal within a lithium-ion cell. In a lithium ion cell, alternating layers anode and cathode are separated by a porous film (separator). An electrolyte composed of an organic solvent and dissolved lithium salt provides the media for lithium ion