HVACR 150 - Electric Motors and Motor Maintenance

Credits: 3
LAB hours per week: 4.500
This course teaches electrical and motor safety, motor applications and characteristics, installation, operation, performance, maintenance, and repair of all AC and DC series motors. Wiring for wye and delta applications is also covered. Electronically Commutated Motors (ECM) will be included in the instruction. NEMA and NEC codes will be applied for motor installation, operations, and maintenance. Other topics will include nameplate data, torque, efficiency, connections, reversing rotation, and instruments used for motor maintenance and testing.
Course Outcomes:

Identify and apply the five rules of safe dress and the nine rules for safe electric motor operation.
Calculate a load on gear-drive and belt-drive systems.
Use a motor pony-break to determine torque measurement and a photo-tachometer to identify motor speed.
Evaluate motor current draw, motor efficiency, and input/output power using motor performance curves.
Operate AC single-phase motors using capacitor-start, permanent-capacitor, and two capacitor applications.
Identify resistor value using color code for bleed resistor.
Determine capacitance using apparent power calculation and power factor correction.
Identify proper terminal connections on capacitors.
Operate three-phase induction motor in both forward and reverse.
Describe connections for wye and delta uses in a three-phase application.
Use National Electric Code ® Article 430 to reference motors, conductors, and controls.
Operate 2.3,3.O, and X13 Electronically Commutated Motors.

Course Topics:

Introduction to electric motors and electrical motor safety
DC series, shunt, and compound motors
Motor speed, torque, and motor performance
Split-phase motors, capacitor-start AC motors, permanent-capacitor motors, and two capacitor motors
Three-phase induction motors
The NEC, motor installation, maintenance, and troubleshooting
ECM motor history, operating characteristics, and troubleshooting