Hydraulic Motors

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Hydraulic Motors
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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.

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Types of Motors(same as Pumps)

• Gear
• Piston
• Vane

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How are they different

• Function
• Design
• Rating systems
• Effectiveness of operations

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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
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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

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How are they different --Rating

• 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

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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

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Motor Problems

• Refer to the text

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End.
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