An electronic circuit comprises a charge storing component, a set of one or more switching components coupled to the charge storing component, and an additional switching component coupled to each of the one or more switching components in the set. The additional switching component is configured to operate in a first state or a second state based on a received current or voltage. The first state prevents current to flow from the charge storing component to each of the one or more switching components in the set and the second state allows current to flow from the charge storing component to each of the one or more switching components in the set.

A drive system includes a frequency converter, a drive unit, and a power supply. The drive unit includes an electric motor and a further component, including a sensor element, actuator element, and/or data storage element. The frequency converter supplies the further component of the drive unit with energy via at least the power supply. The frequency converter is adapted to obtain a first piece of information about the maximum available electrical energy of the power supply and to obtain a second piece of information about the electrical energy requirement of the further component of the drive unit. The frequency converter is adapted to check the plausibility of the first piece of information with respect to the second piece of information. The decision-making criterion for the plausibility check is formed by a logical comparison of the first piece of information with the second piece of information. The frequency converter is configured to adapt the system state of the drive system in accordance with the result of the plausibility check.

A drive system includes a frequency converter, a drive unit, and a power supply. The drive unit includes an electric motor and a further component, including a sensor element, actuator element, and/or data storage element. The frequency converter supplies the further component of the drive unit with energy via at least the power supply. The frequency converter is adapted to obtain a first piece of information about the maximum available electrical energy of the power supply and to obtain a second piece of information about the electrical energy requirement of the further component of the drive unit. The frequency converter is adapted to check the plausibility of the first piece of information with respect to the second piece of information. The decision-making criterion for the plausibility check is formed by a logical comparison of the first piece of information with the second piece of information. The frequency converter is configured to adapt the system state of the drive system in accordance with the result of the plausibility check.

An electric power steering device and method are disclosed. An electric power steering device according to an embodiment of the present invention comprises: a steering motor comprising a first winding and a second winding, each of Which receives applied three-phase power; a first control unit for controlling power supplied to the first winding; and a second control unit for controlling power supplied to the second winding, wherein, when one of a phase of the first winding and a phase of the second winding has failed to be opened, the control unit controlling the winding including the phase that has failed to be opened, among the first control unit and the second control unit, performs torque compensation control for additional output of compensation torque.

An electric power conversion control apparatus includes: a first converter of the first electric power conversion control apparatus and a second converter of the second electric power conversion control apparatus, which feed electric power to a first winding wire and a second winding wire of a dual three-phase motor; a first controller and a second controller, which control the first converter and the second converter; a communication line, which is connected between the first controller and the second controller; and a fifth signal wire for deactivating the operation of the second converter, from the first controller. When a fault is caused by communication errors, the first controller uses the fifth signal wire to deactivate the operation of the second converter, and the electric power conversion control apparatus switches to one system operation by the first controller.

A main power supply having a large capacity and a backup power supply having a small capacity are switchable by a power supply switching determination unit in a system. A motor control device drives a motor by the main power supply or the backup power supply. A drive control unit outputs a drive signal, calculated by feedback control of the current detection value with respect to the current command value, to an inverter circuit. When the power supply switching determination unit switches from the main power supply to the backup power supply, the drive control unit moves from a normal control using the main power supply to a backup control that restricts an electric power consumption and prevents the backup power supply from stopping.

A motor control unit (10) includes, for example, a motor control block (11) that performs feedback control of a drive current that flows through a motor (20) and a machine learning block (14) that analyzes input data including at least the drive current so as to detect a failure level of the motor (20). The motor control block (11) could be configured to dynamically switch a control parameter or a control method in accordance with the failure level. The input data may further include, for example, a drive voltage applied to the motor (20). Furthermore, the input data may further include, for example, at least one of vibrations and a temperature of the motor (20) or a motor device (1) mounting the motor (20) therein.

An electric movable body includes an output shaft and multiple motors that drive the output shaft. The electric movable body performs a double drive control to assign a drive state to at least two of the motors, performs, when the double drive control is performed and on determination that one of the motors is abnormal, a single drive control to assign the drive state to only one of the motors and to assign a stop state to another of the motors, and identifies, when the single drive control is performed, a drive motor, to which the drive state is assigned and which is abnormal, based on a predetermined state quantity correlated with a drive state of the drive motor.

A digital positioner for a valve includes a valve controller configured to obtain a set point value for a valve travel of a valve, and generate a pulse-width modulated current signal based on the set point value. The digital positioner also includes a current-to-pressure converter configured to receive the pulse-width modulated current signal from the valve controller, convert the pulse-width modulated current signal to a pulse-width modulated pressure signal, and provide the pulse-width modulated pressure signal to a pneumatic actuator in the valve to adjust a position of the valve.

A digital positioner for a valve includes a valve controller configured to obtain a set point value for a valve travel of a valve, and generate a pulse-width modulated current signal based on the set point value. The digital positioner also includes a current-to-pressure converter configured to receive the pulse-width modulated current signal from the valve controller, convert the pulse-width modulated current signal to a pulse-width modulated pressure signal, and provide the pulse-width modulated pressure signal to a pneumatic actuator in the valve to adjust a position of the valve.