EM-8. Frame material vs size and cost

Choose frame material suitable for the given environment.

Case 1

Application - food & beverages (wet, acids, etc.)

Take CONVEYOR with drive system with just frequency converter.

Available information:

• One drum to be driven
• No overloads, duty cycle – 100%
• Dusty environment, abundant heat removal capability, wet floor
• Grid 400 V
• Distance between the driven drum of the conveyor and the FC (cable length) – 30 m
• Rated torque 500 Nm
• Speeds: min – 300, max - 400 rpm

Case 2

Application - mining (dusty, mechanical shocks)

Take WINCH with drive system with just frequency converter.

Available information:

• empty drum diameter 0.2 m
• full drum diameter 0.3 m
• linear speed at which the cable is to be reeled on the drum - 1 m/s
• force/tension on the cable 2 kN
• grid voltage 400 V
• no overloads

Case 3

Application – marine deck machinery (salty environment)

Case 4

Application – light/portable winch for a palette truck operating in a clean storage hall.

Draw conclusions.