(under subclass 445) Subject matter in which means are provided for preventing or for reducing the tendency of the motor control means to cause the motor to "hunt" overtravel or to be over-compensated. The systems included herein are "open loop" controls and thus are not servomechanisms.
(1) Note. "Overcompensation" is defined for the purposes of this class as that condition which exists when the automatic control means, in consequence of its sensing means responding to a change in some predetermined condition, cause the operation or control of the motor to be extended or continued beyond that necessary to restore the condition to the desired value. "Overtravel" is defined as the movement of the motor, or devices actuated thereby, beyond that necessary to cause the condition to be restored to the desired value and is the direct and proximate result of the "overcompensation" defined above. "Hunting" is defined as that condition which exists as a result of "overcompensation" or "overtravel" in which the sensing means again responds to the extended or excessive change in condition beyond that desired to cause the control means to effect a control of the motor in the opposite direction. Should the control means again overcompensate, the operation of the control means may be initiated for several or for an indefinite number of times. These successive operations or controls of the motor in an attempt to restore the condition to a predetermined value is known as "hunting"; and the means provided to prevent or reduce hunting are known as "anti-hunting" means.
(2) Note. Where the system is a closed loop position servomechanism, classification is not herein, but in subclass 611, above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
362, and the subclasses specified in the Notes thereto, for motor systems having means for braking a motor in order to prevent overtravel of a motor after the energy flow thereto has been terminated.
611, see Note (2) above. SEE OR SEARCH CLASS
322, Electricity: Single Generator Systems,
39, for anti-hunting means in electric generating systems.
333, Wave Transmission Lines and Networks,
19, for differentiating or integrating networks of the passive type.
