variabledisplacementmotor

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variabledisplacementmotor

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Iconic Diagrams\Hydraulics\Pumps\Basic Pumps

Use

Domains: Continuous. Size: 1-D. Kind: Iconic Diagrams (Hydraulics).

Description

This model describes an ideal motor with an axial speed that is proportional to the input flow rate:

 

pa.phi = pb.phi = i * p_rot.omega;

i = D * c / (2*pi);

 

The torque is equal to:

 

p.T = i*(pa.p - pb.p);

 

The displacement is controllable by the input signal c. For a positive rotation of the driving axis the flow is:

 

c >= 1

c = 0

c <= -1

maximum flow from port 1 to port 2

zero flow

maximum flow from port 2 to port 1

 

If the port pressure is smaller than the vapour pressure (p < p_vapour), the flow is zero. If the port pressure becomes larger than the vapour pressure the flow gradually grows to its normal value, until the atmospheric pressure (p = 0) is reached.

Interface

Ports

Description

pa

pb

p_rot

inlet port (hydraulic)

outlet port (hydraulic)

axis (rotation)

Causality

 

fixed volume flow out pa

fixed volume flow out pb

fixed torque out p_rot

 

Input

 

c

relative displacement

Parameters

 

D

displacement per revolution [m3]