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Hydraulic Motors. Objectives. 1. Explain the difference in a motor and a pump. 2. Explain the difference in a fixed displacement and a variable displacement motor. 3. Describe the design differences in the three common types of motors explained in the book.
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Objectives • 1. Explain the difference in a motor and a pump. • 2. Explain the difference in a fixed displacement and a variable displacement motor. • 3. Describe the design differences in the three common types of motors explained in the book. • 4. Explain the difference in the two types of gear motors. • 5. Explain how a gear motor works. • 6. Explain how a vane motor works. • 7. Explain how a piston motor works. • 8. List six factors to consider when selecting a motor. • 9. Explain how torque is related to motor selection. • 10. List and explain five common malfunctions of a motor. • 11. Describe 5 examples of improper operation. • 12. List 5 symptoms of a motor failure. • 13. Given a situation related to motor failure, suggest a cause and a remedy.
Types of Motors(same as Pumps) • Gear • Piston • Vane
How are they different • Function • Design • Rating systems • Effectiveness of operations
How are they different –Function • Pumps Push -- Point A • Create pressure • Motors Apply – Point B • Apply the pressure to create rotary motion. • Do the work Pump
How are they different – Design • Design of bearing to endure the load • Pressure on back side of vanes in a vane type pump • Reversible (pumps are not generally reversible – Motors are) • Inlet and outlet size • Pump inlet side needs to be bigger • Motor the outlet sides needs to be larger
Pump Pressure psi Horsepower (HP) GPM RPM (1800 or 3600) Direction of rotation (CCW) Inlet or outlet size Mounting Shaft size Motor Torque GPM RPM HP How are they different --Rating
How are Motor different from each other? • Physical Size • Weight to power ratio • PSI range • RPM • Torque • Overload torque • Volumetric efficiency • Bearing life • Repair cost and life of motor • Cost • See chart in the book for more details
Motor Problems • Refer to the text