At the end of this module, you will be able to:
- Explain the fundamental principles of DC motor operation
- Identify and describe common DC motor components
- Explain the concepts of torque, speed, and power
The following key questions are answered in this module:
How does a DC motor convert electrical energy to mechanical energy?
To convert electrical energy into mechanical energy, a DC motor relies on the controlled movement of components that are subjected to opposing magnetic fields.
How is an electromagnet created?
Magnetic fields can either be produced by magnets or generated by passing an electrical current through a wire to create an electromagnet.
What are some common components needed for a DC motor to function?
Most DC motors require the following components to function: An associated power supply, often a type of battery or AC rectifier; A "stator," the stationary device with magnets or windings that produces a magnetic field around the armature; An armature assembly, or rotor, with windings that rotate around a shaft and create a magnetic field of alternating polarity; A commutator that directs current flow and polarity through the armature windings.
Below is a transcript of the video sample provided for this module:
DC motors are electrical motors powered by direct current, or DC. DC is a type of electrical current that flows in one direction only from sources such as batteries or solar panels. DC may also be produced through the use of a rectifier, which is an electrical device which converts alternating current, or AC, to DC. In spite of their structural differences, the five main types of DC motors discussed in this course perform the same basic function. They convert electrical energy into mechanical energy to spin, lift, wind, or move objects.
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