drecon-unity/Assets/8_Scripts/2_General/Rotate.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Rotate : MonoBehaviour
{
    // Update is called once per frame
	public float m_Speed;
    private float m_X;
    private float m_Y;
    private float m_Z;
    public enum Axis
    {
        X, 
        Y, 
        Z
    }

    public Axis m_Axis;
    void Update()
    {
        float speed = -Time.fixedDeltaTime * m_Speed;

        m_X = 0;
        m_Y = 0;
        m_Z = 0;

        if (m_Axis == Axis.X)
        {
            m_X = speed;
        } else if (m_Axis == Axis.Y)
        {
            m_Y = speed;
        } else if (m_Axis == Axis.Z)
        {
            m_Z = speed;
        }

        this.transform.Rotate(m_X, m_Y, m_Z, Space.World);
    }
}