@classmethod
def build_from_coeffs(cls, nor_max_rpm_a, nor_max_rpm_b, nor_min_rpm_a,
    nor_min_rpm_b, max_torque, stall_torque):
    """Used to build a motor model if you already know the motor coefficients.
        
        Parameters
        ----------
        nor_max_rpm_a : float
            nor_max_rpm_a
        nor_max_rpm_b : float
            nor_max_rpm_b
        nor_min_rpm_a : float
            nor_min_rpm_a
        nor_min_rpm_b : float
            nor_min_rpm_b
        max_torque : float
            max_torque
        stall_torque : float
            stall_torque
        
        Returns
        -------
        MotorModel
            A :obj:`MotorModel` object

        """
    motor_model = cls([0, 1], [0, 1], [1, 2], stall_torque, max_torque)
    motor_model.nor_max_rpm_a = nor_max_rpm_a
    motor_model.nor_max_rpm_b = nor_max_rpm_b
    motor_model.nor_min_rpm_a = nor_min_rpm_a
    motor_model.nor_min_rpm_b = nor_min_rpm_b
    return motor_model
