ConstantRotate

using UnityEngine;
using System.Collections;

public class ConstantRotate : MonoBehaviour {

    public float RotationsPerMinuteY=0;
    public float RotationsPerMinuteX=0;
    public float RotationsPerMinuteZ=0;

    void Update ()
        {
            Vector3 ConstantRotation = new Vector3 (0,0,0);

            if(RotationsPerMinuteX>0) {
                ConstantRotation.x=6.0f*RotationsPerMinuteX*Time.deltaTime;
            }

            if(RotationsPerMinuteZ>0) {
                ConstantRotation.z=6.0f*RotationsPerMinuteZ*Time.deltaTime;
            }

            if(RotationsPerMinuteY>0) {
                ConstantRotation.y=6.0f*RotationsPerMinuteY*Time.deltaTime;
            }
            transform.Rotate (ConstantRotation); //rotates 50 degrees per second around z axis
        }
}