DC MOTORS AND GENERATORS
PublicResourceOrg・19 minutes read
Rotating electrical machinery in military equipment relies on AC and DC motors and generators, with DC generators producing pulsating direct current and different types of DC generators having unique characteristics for voltage and current regulation. DC motors, like generators, use electromagnets for the field and different windings affect torque and speed control, with shunt, series, and compound motors offering varying starting torque and speed regulation capabilities.
Insights
- The functioning of military equipment heavily depends on the proper operation of rotating electrical machinery, with AC and DC motors and generators being crucial components that generate electromotive force (EMF) through conductor movement in a magnetic field, influencing factors like magnetic field strength, conductor length, and velocity.
- DC generators convert rotary motion into pulsating direct current (PDC) using commutators, which can be optimized to reduce ripple by increasing loops and commutator segments; DC motors, utilizing electromagnets for field control, vary in characteristics like torque and speed regulation based on different field winding configurations, such as series, shunt, and compound motors, each designed for specific applications within the machinery.
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Recent questions
What are the two common types of motors and generators?
AC and DC
How is electromotive force (EMF) generated in motors and generators?
Through movement of conductors in a magnetic field
How can the amount of EMF generated be influenced?
By the strength of the magnetic field, length of the conductor, and velocity of the conductor
How can sparking between the commutator and brush assembly in DC generators be prevented?
By adjusting brush position or adding Interpol's
What are the different types of DC generators?
Series, shunt, and compound
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Summary
00:00
Understanding AC and DC Motors and Generators
- Military equipment relies on properly functioning rotating electrical machinery.
- Two common types of motors and generators are AC and DC.
- DC motors and generators operate based on the generation of electromotive force (EMF) through the movement of conductors in a magnetic field.
- The amount of EMF generated is influenced by the strength of the magnetic field, length of the conductor, and velocity of the conductor.
- In a rotary path, the number of lines cut by the conductor varies, affecting the generated EMF.
- All rotary generators produce AC internally.
- To convert a generator into a DC generator, a commutator is attached to the conductor.
- DC generators produce pulsating direct current (PDC) with ripple, which can be reduced by adding more loops and commutator segments.
- Sparking between the commutator and brush assembly in DC generators can be prevented by adjusting brush position or adding Interpol's.
- Different types of DC generators include series, shunt, and compound, each with varying voltage and current regulation characteristics.
24:51
DC Motor Characteristics and Operation Explained
- Shunt motor with starting box gradually builds up rotor speed and CE EMF by closing circuit through resistance coils, cutting them out until running speed is reached; electromagnet holds lever open, returning it to start if power fails.
- DC motors, like generators, use electromagnets for field instead of permanent magnets; different field windings have unique characteristics and uses, affecting torque and speed control.
- Series wound motor has good starting torque dependent on armature current and field strength; shunt motor has less starting torque but better speed control due to parallel field coil connection.
- Compound motor combines series and shunt motor characteristics for good starting torque and speed regulation; operation of rotating electrical machinery relies on generating EMF, with AC generators becoming DC generators with commutators for direct current production.
