Title: Unit 6 Outline
Course: HET 194 NATE Certification Preparation - Spring 2015 > Section: HET 194 NATE Certification Preparation - Spring 2015

Unit 6 Outline

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Unit 6 - Week 11 and 12 Outline

1. Motor Components
  - Rotor
  - Stator
  - Shaft
  - Run Windings
  - Start Windings
  - End Bells
2. Inductive Motor Operation
  - Magnetism
  - Induction
  - Two Pole Motors
  - Speed of Motors
  - Strength of Motors
3. Split Phase Motors
  - Sets of Windings
  - Purpose of Start Windings
  - Purpose of Start Windings
  - Controls used for disconnecting the Start Windings
4. Permanent Split Capacitors Motors
  - Operation of a PSC Motor
  - Efficiency of a PSC Motors
  - Uses of PSC Motors
5. Controlling the start windings
  - Centrifugal Switches
  - Current Relays
  - Potential Relays
6. Shaded Pole Motors
  - Operation of a Shaded Pole Motors
  - Efficiency of a Shaded Pole Motor
  - Uses of Shaded Pole Motors
7. Higher Efficiency Split Phase Motors
  - Types of higher efficiency motor
8. Capacitor Start Motors
  - Operation of a Capacitor Start Motor
  - Type of Efficiency of a Capacitor Start Motor
  - Uses of Capacitor Start Motors
9. Capacitor Start, Capacitor Run Motors
  - Operation of a Capacitor Start, Capacitor Run Motor
  - Type of Efficiency of a Capacitor Start, Capacitor Run Motor
  - Uses of a Capacitor Start, Capacitor Run Motor
10. Three Phase Motors
  - Operation of a Three Phase Motors
  - Type of Three Phase Motors
  - Type of Efficiency of a Three Phase Motor
  - Uses of a Three Phase Motor
11. Control Voltage
  - Transformer
  - Primary Coil
  - Secondary Coil
  - Turns and Voltage Relationship
12. Types of Transformers
  - Step Down Transformers
  - Step Up Transformers
13. Ratings of Transformers

Summary

- Motors make comfort feasible through moving air, fluids, heat, cooling, and energy more efficiently.
- There are many types of motors but each type of motor will have its own special purpose.
- Shaded poles motors are the least efficient motor, while 3 phase motors are the most efficient.
- Capacitors are used on split phase motors to make it more efficient.
- Start windings should only stay in the circuit for a short time or the motor can be damaged.
- Relays or switches are used to disconnect the start windings after starting up.
- The speed and strength of a motor is based on the number of windings the motor have.
- Control Devices are the part of an electrical system to operate when, how, where, and what will be turned on, off, and by a variable signal.
- HVAC/R systems need to control the temperature, pressure, flow, humidity, and level for the comfort of humans; therefore, it is necessary to know all possible sequence of operations of a HVAC/R system.

Vocabulary

- End Bell
- Rotor
- Stator
- Shaft
- Capacitor
- Current Relay
- Potential Relay
- Split Phase
- Permanent Split Capacitor Motor
- Shaded Pole Motor
- Inductive Motor
- 3 Phase
- Delta
- Wye
- Start Capacitor
- Run Capacitor
- Potential Relay
- Starting Relay
- Service Factor
- Power Factor
- Motor Ratings