A solid state motor control circuit for controlling the operation of a servo motor comprises a comparator circuit including a differential amplifier having its inputs connected across terminals of the motor and having its output connected to a drive circuit the output of which is connected to a supply terminal of the motor. A reference circuit maintains a reference terminal of the motor at a reference level, and in the absence of a command signal, the differential amplifier and drive circuit maintain the voltage at the motor supply terminal at the reference level. A control switch enabled by the command signal applies a control signal to an input of the differential amplifier, and the differential amplifier responsively enables the drive circuit to raise or lower the potential at the motor supply terminal relative to the reference level, thereby energizing the motor. Upon termination of the command signal, the control switch is disabled, removing the control signal from the input of the differential amplifier and through negative feedback, the differential amplifier and drive circuit return the voltage at the motor supply terminal to the reference level, approximating a dynamic braking function for stopping the motor.

A control circuit for an electric motor is proposed, whose rate of rotation and rotational direction depends on a control signal (Ue) at the input terminal (10). The rotational direction is given by means of a determined control signal level being exceeded or fallen short of. The rate of rotation is controlled by means of a pulse width modulation of the control signal (Ue). There is a nonlinear relationship between the change in the pulse duty factor of the pulse width modulation and the control signal. The mean adjusting speed of an actuating motor accordingly adapts to the control deviation signal of an actuating control.

This disclosure provides a motor control system and method that is preferably applied to cargo power drive units. Power is supplied to a motor having one or more windings and a thermocouple that is embedded in the motor windings. The thermocouple provides an electronic signal from which both motor temperature and rate of temperature change are derived. A motor control circuit uses these values to determine if a jam condition has occurred (as represented by improper temperature rise) or whether critical overheating is occurring. If so, the motor control circuit causes a power switch to disconnect power from one or more PDUs in the subject bank of PDUs. Power is temporarily disabled, until a cargo operator releases a joy stick control to a neutral position and then attempts to use it again.

The invention is a control system for generating time modulated pulse signals to effect movement of a doser type actuator. The control system is characterized in that it includes an augmenter circuit which generates a first correction signal additive to scheduled control signals when the actuator fails to respond or has a response below a predetermined limit to an actuating pulse, a second correction circuit which generates a correction signal proportional to the magnitude of the first movement of the actuator response to a pulse signal for reducing the magnitude of the pulse signal in proportion to the magnitude of the movement, and a gating signal or circuit which blocks said first and second correction signal generating circuits generating the augmentation signal when the movement of the actuator in response to a pulse signal is negative or above a predetermined limit, when the positional error changes direction, or when the actuator position is within the desired deadband limits.

A control device for regulating the output voltage of a voltage regulator wherein the output from that regulator would normally be variable includes inputting that voltage to the control device. There are two overlapping bands which define an effective bandwidth between the upper limit of the lower band and lower limit of the upper band. The output of the device provides a signal responsively regulated in the effective bandwidth such that the output from the regulator can be similarly regulated. In power generation systems a narrow bandwidth can be effectively maintained to permit narrow variations of voltage. A micro-processor facilitates changing the regulated levels for the control device such that the output from the control device can be selectively and controllably changed as desired.