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  1. What are the main advantages of gear motors?
  • The main advantages of hydraulic motors are following: -


This does not mean just increasing the torque by using a geared type motor. Rather, whereas

the inertia that the motor itself can drive is 10 times the rotor inertia, the geared type can drive

this inertia multiplied by the square of the speed reduction ratio. Therefore, for driving an

inertial body such as in this case, selecting a geared type makes it possible to reduce the

installation dimension from 85 mm ???? 60 mm square and the total length from 128 mm to 93.5

mm. Comparison of operation conditions

Reduced Vibration

Vibration can be reduced for the following reasons.

  • The vibration characteristic itself is reduced.
  • Through speed reduction, the low-speed region at which the motor vibrates can be avoided.
  • Because the motor is smaller, its own vibration is reduced.

Positioning time

Because this comparison uses an inertia structure that can be driven by the motor itself the

advantages of geared type motors for acceleration were not manifest, but the larger the inertia

body, the more the geared type motor reduces the acceleration time.

Positioning angle

For and RK series, since the basic step angle is 0.72°,30° and 60° positioning was not possible,but

since 1/7.2, 1/36, and other speed reduction ratios are available for geared type motors, 30° and

60° positioning are possible. This time, to compare a motor alone and a geared type motor

under the same conditions, 45° positioning was used because it can be used by both types of motors.


  1. For a hydraulic motor, define volumetric, mechanical and overall efficiency.
  • Volumetric Efficiency: -

The theoretical flow rate compared to the actual flow rate. Volumetric efficiency describes the amount of leakage, or losses in volume, in a hydraulic component.


Mechanical Efficiency: -

The theoretical operating horsepower compared to the operating horsepower. Mechanical horsepower describes the amount of energy loss in a hydraulic component.


Overall Efficiency: -

A variable that describes all energy losses in a hydraulic system. Overall efficiency is determined by multiplying volumetric efficiency by mechanical efficiency and dividing by 100.


  1. What is a hydrostatic transmission? Name four advantages it typically possesses.
  • Four hydrostatic transmission advantages are following: -
  • Split transmission
  • Vehicle Propulsion
  • Closed circuit hydrostatic transmissions
  1. Knowing the displacement and speed of a hydraulic motor, how do you calculate the gpm flowing through it?
  2. A hydraulic system contains a pump that discharges oil at 2000 psi and 100 gpm to a hydraulic motor, as shown in the following graphic. The pressure at the motor inlet is 1800 psi due to a pressure drop in the line. If oil leaves the motor at 200 psi determine the output power delivered by the 100 % efficient motor.
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  1. What are xxxxxxx main advantages xxxxxxx gear motors?


This xxxxxxx not xxxxxxx xxxxxxx increasing the xxxxxxx by using xxxxxxx geared type xxxxxxx Rather, whereas

the xxxxxxx that the xxxxxxx itself can xxxxxxx xxxxxxx 10 xxxxxxx the rotor xxxxxxx the geared xxxxxxx can xxxxxxx xxxxxxx multiplied by xxxxxxx square of xxxxxxx speed reduction xxxxxxx Therefore, for xxxxxxx an

inertial body xxxxxxx as in xxxxxxx xxxxxxx selecting xxxxxxx geared type xxxxxxx it possible xxxxxxx reduce xxxxxxx xxxxxxx from 85 xxxxxxx ???? 60 xxxxxxx square and xxxxxxx total length xxxxxxx 128 mm xxxxxxx 93.5

mm. Comparison xxxxxxx xxxxxxx conditions

Reduced xxxxxxx can be xxxxxxx for the xxxxxxx reasons.

  • The xxxxxxx xxxxxxx itself is xxxxxxx speed reduction, xxxxxxx low-speed region xxxxxxx which the xxxxxxx vibrates can xxxxxxx avoided.
  • Because the xxxxxxx xxxxxxx smaller, xxxxxxx own vibration xxxxxxx reduced.

Positioning time

Because xxxxxxx comparison xxxxxxx xxxxxxx inertia structure xxxxxxx can be xxxxxxx by the xxxxxxx itself the

advantages xxxxxxx geared type xxxxxxx for acceleration xxxxxxx xxxxxxx manifest, xxxxxxx the larger xxxxxxx inertia

body, the xxxxxxx the xxxxxxx xxxxxxx motor reduces xxxxxxx acceleration time.

Positioning xxxxxxx and RK xxxxxxx since the xxxxxxx step angle xxxxxxx 0.72°,30° and xxxxxxx xxxxxxx was xxxxxxx possible,but

since 1/7.2, xxxxxxx and other xxxxxxx reduction xxxxxxx xxxxxxx available for xxxxxxx type motors, xxxxxxx and

60° positioning xxxxxxx possible. This xxxxxxx to compare xxxxxxx motor alone xxxxxxx xxxxxxx geared xxxxxxx motor

under xxxxxxx same conditions, xxxxxxx positioning xxxxxxx xxxxxxx because it xxxxxxx be used xxxxxxx both types xxxxxxx motors.


  1. Volumetric Efficiency: xxxxxxx theoretical flow xxxxxxx compared xxxxxxx xxxxxxx actual flow xxxxxxx Volumetric efficiency xxxxxxx the amount xxxxxxx leakage, or xxxxxxx in volume, xxxxxxx a hydraulic xxxxxxx xxxxxxx -

    The xxxxxxx operating horsepower xxxxxxx to the xxxxxxx horsepower. xxxxxxx xxxxxxx describes the xxxxxxx of energy xxxxxxx in a xxxxxxx component.


    Overall Efficiency: xxxxxxx variable that xxxxxxx all energy xxxxxxx xxxxxxx a xxxxxxx system. Overall xxxxxxx is determined xxxxxxx multiplying xxxxxxx xxxxxxx by mechanical xxxxxxx and dividing xxxxxxx 100.


    1. What xxxxxxx a hydrostatic xxxxxxx Name four xxxxxxx it typically xxxxxxx xxxxxxx hydrostatic xxxxxxx advantages are xxxxxxx -
      • Split transmission
      • Vehicle xxxxxxx circuit xxxxxxx xxxxxxx value="4">Knowing the xxxxxxx and speed xxxxxxx a hydraulic xxxxxxx how do xxxxxxx calculate the xxxxxxx flowing through xxxxxxx xxxxxxx hydraulic xxxxxxx contains a xxxxxxx that discharges xxxxxxx at xxxxxxx xxxxxxx and 100 xxxxxxx to a xxxxxxx motor, as xxxxxxx in the xxxxxxx graphic. The xxxxxxx at the xxxxxxx xxxxxxx is xxxxxxx psi due xxxxxxx a pressure xxxxxxx in xxxxxxx xxxxxxx If oil xxxxxxx the motor xxxxxxx 200 psi xxxxxxx the output xxxxxxx delivered by xxxxxxx 100 % xxxxxxx xxxxxxx
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