-------------------------------------------------------------------------------
-- Copyright (c) 2003 Mentor Graphics Corporation
--
-- This model is a component of the Mentor Graphics VHDL-AMS educational open 
-- source model library, and is covered by this license agreement. This model,
-- including any updates, modifications, revisions, copies, and documentation 
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-- THIS MODEL IS LICENSED TO YOU "AS IS" AND WITH NO WARRANTIES, EXPRESS OR 
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-- File       : fan.vhd
-- Author     : Mentor Graphics
-- Created    : 2001/06/16
-- Last update: 2003-04-18
-------------------------------------------------------------------------------
-- Description: Fan Load (ROTATIONAL_VELOCITY domain)
-------------------------------------------------------------------------------
-- Revisions  :
-- Date        Version     Author              Description
-- 2001/06/16  1.0         Mentor Graphics     Created
-- 2003-04-02  1.1         Mentor Graphics     IEEE package update v1.3
-------------------------------------------------------------------------------

-- Use proposed IEEE natures and packages
library IEEE;
use IEEE.mechanical_systems.all;

entity fan is

  generic (d1 : real;              -- First order drag coef [N*m/(rad/s)]
           d2 : real;              -- Second order drag coef [N*m/(rad/sec)**2]
           j  : moment_inertia);  -- Moment of inertia [kg*meter**2]

  port (terminal rotv1 : rotational_velocity);

end entity fan;

-------------------------------------------------------------------------------
-- Ideal Architecture
-- Tload = D1*W + D2*W**2 + J*dW/dt
-------------------------------------------------------------------------------
architecture ideal of fan is

  quantity w across torq through rotv1 to rotational_velocity_ref;

begin

  torq == d1*w + d2*w*abs(w) + j*w'dot;

end architecture ideal;

-------------------------------------------------------------------------------
-- Copyright (c) 2003 Mentor Graphics Corporation
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