DC MOTORS

Connect a Ward-Leonard System

Module: DC-3

Overview:

 In this module you will learn how to connect Ward Leonard speed control

Key and critical concepts which you will learn how to:

  • Wire all the given components to form a Ward-Leonard control system.
  • Comply with the requirements of the hazard identification and control(HIAC) form

Tools, consumables, machinery and equipment required:

  • Generator
  • Load
  • DC Machines
  • AC Motor
  • A panel to wire, connecting conductors,

Related modules:

  • DC-T
  • DC-1
  • DC-2

Application:

  • The ward learnard is commonly used in heavy drive applications i.e mining winders

Additional resources

  • Subject matter experts
  • In-company Standard Operating Procedures

Connect a DC Motor and Starter

Module:  DC-2

Overview:

 In this module you will learn how to connect a DC motor and starter

Key and critical concepts which you will learn how to:

  • Draw the wiring diagram for a DC motor and starter.
  • Test the motor and starter and connect them
  • Comply with the requirements of the hazard identification and control (HIAC) form

Tools, consumables, machinery and equipment required:

  • Learning material
  • Face plate starter
  • Direct Current motor
  • Load
  • A panel to wire, connecting conductors

Related modules:

  • DC-T
  • DC-1

Application:

  • These motors is commonly used in industry as they produce better power, torque characteristics than the AC machines of the same power torque

Additional resources

  • Subject matter experts
  • In-company Standard Operating Procedures

Connect a Load to a DC Generator

Module:  DC-1

Overview:

 In this module you will learn how to connect a load to a generator

Key and critical concepts which you will learn how to:

  • Test the leads to determine the field coils and the armature of a DC machine.
  • Connect the machine to run as a series, shunt and compound generator.
  • Measure the terminal voltage and load current and draw the characteristics curves of the three generators mentioned above, on the graph paper supplied.
  • Comply with the requirements of the hazard identification and control(HIAC) form

Tools, consumables, machinery and equipment required:

  • Generator
  • Learning material
  • Load
  • A panel to wire, connecting conductors,

Related modules:

  • DC-T

Application:

  • These generators is commonly used to generate DC power to loads

Additional resources

  • Subject matter experts
  • In-company Standard Operating Procedures

Explain Direct Current Machines (Theory)

Module:  DC-T

Overview:

 In this module you will learn the theory of direct current machines

Key and critical concepts which you will learn how to:

  • Explain why the armature of a DC machine is laminated.
  • Explain the purpose of a commutator.
  • Explain why is dangerous to lose the field of a shunt motor.
  • Explain the effect on a series DC motor when it is run without a load.
  • Name TWO methods of speed control used on a DC motor.
  • Explain how the output voltage of a shunt generator is controlled.
  • Name two methods of controlling the arcing of the brushes on the commutator of a DC machine
  • Explain how the polarity of the interpoles of a DC machine is determined.
  • Draw the schematic diagrams of a shunt and series wound DC motor.
  • Comply with the requirements of the hazard identification and control (HIAC) form

Tools, consumables, machinery and equipment required:

  • Learning material
  • Direct current motors series, shunt and compound motors

Related modules:

  • PST-1

Application:

  • These motors can be used for portable power tools and appliances. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills.

Additional resources

  • Subject matter experts
  • In-company Standard Operating Procedures