High Speed ​​Hydraulic Motor Overview

1. Axial piston hydraulic motor

• Working principle The larger the inclination angle of the swash plate, the greater the torque and the slower the speed.

• Parameter calculation The speed and torque of the straight-axis axial piston motor are calculated as follows:

  n = 4Q/πd²zD₀tgγ₁·η_v (rpm)

  M = 1/8·d²zD₀tgγ₁(p₁-p₂)·η_m (kgf·cm)

  The speed and torque of the inclined-axis axial piston motor are calculated as follows:

  n = 4Q/πd²zD₀sinγ₂·ηv (rpm)

  M = 1/8·d²zD₀sinγ₂(p₁-p₂)·η_m (kgf·cm)

  Where:

  Q - input flow (cm³/min)

  d - plunger diameter (cm)

  z - number of plungers

  D₀ - plunger distribution diameter (cm)

  γ₁ - inclined plate inclination

  γ₂ - cylinder inclination

  p₁ - inlet liquid pressure (kgf/cm²)

  p₂ - outlet liquid pressure (kgf/cm²)

  η_v - volumetric efficiency

  η_m - mechanical efficiency

2. Gear hydraulic motor

• Parameter calculation The speed n and torque M are calculated as follows

        n＝Q/q₀·ηv＝Q/2πzm²b·η_v (rpm)

        M＝(p₁-p₂)bzm²·ηm (kgf·cm)

        Where: Q——input flow (cm³/min)

        q₀——theoretical displacement (cm³/rev)

        z——number of teeth

        m——module (cm)

        b——tooth width (cm)

        p₁——inlet fluid pressure (kgf/cm²)

        p₂——outlet fluid pressure (kgf/cm²)

        η_v——volumetric efficiency

        η_m——mechanical efficiency

Gear hydraulic motor has simple structure, small size, light weight, impact resistance, small inertia, easy maintenance, low price, low requirements for oil filtration accuracy, but large flow pulsation, low volumetric efficiency, small torque, and poor low-speed stability.

2. Vane hydraulic motor (generally used double-acting type, cannot be variable)

• Parameter calculation The speed n and torque M are calculated as follows

        n＝Q/q₀·ηv＝Q/2[π(R²-r²)-(R-r)/cosθ·δ_z]b·η_v (rpm)

        M＝(p₁-p₂)q₀/2π·η_m＝(p₁-p₂)[π(R²-r²)-(R-r)/cosθ·δ_z]b /π·η_m (kgf·cm)

        Where: Q——input flow (cm³/min)

        q₀——theoretical displacement (cm3/rev)

        R——large radius of stator cavity (cm)

        r——small radius of stator cavity (cm)

        δ——blade thickness (cm)

        z——number of blades

        b——blade width (cm)

        θ——blade inclination angle

        p₁——inlet liquid pressure (kgf/cm2)

        p₂——outlet liquid pressure (kgf/cm2)

        η_v——Volumetric efficiency

        η_m——Mechanical efficiency

       

Tags: Hydraulic Motor, Piston Motor, Motor Formula, Motor Parts, Gear Motor, Vane Motor, Motor Fulid Pressure, Input Flow