A drive device for a vehicle flap includes an electric motor (2) for driving the vehicle flap, and a supply switching circuit (3). The supply switching circuit (3) includes a first voltage source (9) for supplying current to the electric motor (2), a first electrical supply line (4) and a second electrical supply line (5). The first voltage source (9) is arranged between the first electrical supply line (4) and the second electrical supply line (5). The drive device also includes a control switching circuit (12) including a second voltage source (14) and a switching control device (13). The drive device includes a switching element (10) and a diode (11) connected between the first electrical supply line (4) and the second electrical supply line (5).

An electric work machine (1) includes a motor (1), a manipulatable part (9), a control part (20) configured to perform a first braking control and a second braking control that differ from each other, and a kickback-detection part (20, S30) that detects whether kickback has occurred. The control part energizes the motor in response to detection of user-manipulation of the manipulatable part. In response to detection of kickback, the control part performs the first braking control and thereby causes the motor to generate a first braking force. In response to detection of a state change of the manipulatable part to an unmanipulated or OFF state, the control part performs the second braking control and thereby causes the motor to generate a second braking force, which is weaker than the first braking force.

A safety torque off (STO) device interrupts torque generation by an elevator installation drive machine supplied by a power supply device being part of an inverter device, for example. The STO device includes a control input, signal input terminals connected to signal generation device outputs and signal output terminals connected to driver circuit inputs. Each of the STO signal input terminals is electrically connected to an associated one of the signal generation device outputs via first and second signal transmission switches connected in series. The control input is connected to first and second control units, wherein the first control unit, controlled by a control signal applied to the control input, switches switching states of all the first signal transmission switches and the second control unit, controlled by a control signal applied to the control input, switches switching states of all of the second signal transmission switches.

A safety torque off (STO) device interrupts torque generation by an elevator installation drive machine supplied by a power supply device being part of an inverter device, for example. The STO device includes a control input, signal input terminals connected to signal generation device outputs and signal output terminals connected to driver circuit inputs. Each of the STO signal input terminals is electrically connected to an associated one of the signal generation device outputs via first and second signal transmission switches connected in series. The control input is connected to first and second control units, wherein the first control unit, controlled by a control signal applied to the control input, switches switching states of all the first signal transmission switches and the second control unit, controlled by a control signal applied to the control input, switches switching states of all of the second signal transmission switches.

A two-stage braking method for a brushless DC (BLDC) motor. The method includes control a switching array to drive the BLDC motor according to a commutation scheme to decrease a speed of the BLDC motor, allow the BLDC motor to coast, determine the speed of the BLDC motor, and actuate high side switches and/or low side switches to substantially stop rotational movement of the BLDC motor.

This disclosure describes at least embodiments of an aircraft monitoring system for an electric or hybrid airplane. The aircraft monitoring system can be constructed to enable the electric or hybrid aircraft to pass certification requirements relating to a safety risk analysis. The aircraft monitoring system can have different subsystems for monitoring and alerting of failures of a component, such as a battery pack, a motor controller, and/or a motors. The failures that pose a greater safety risk may be monitored and indicated by one or more subsystems without use of programmable components.

A gate driver includes a variable strength driver circuit that provides an output signal to drive a high power device. The gate driver receives an update request from a host controller during an operating mode in which switching operations occur and updates one or more operating parameters associated with driving the high power device. The operating parameters including turn-on parameters, turn-off parameters, and soft shutdown parameters. The variable strength driver circuit uses the turn-on parameters for turn-on phases for the output signal, uses the turn-off parameters for turn-off phases for the output signal, and uses the soft shutdown parameters for soft shutdown phases for the output signal. The update request adjusts current, voltage, and/or time for one or more phases of the turn-on, turn-off and/or soft shutdown parameters.

A gate driver includes a variable strength driver circuit that provides an output signal to drive a high power device. The gate driver receives an update request from a host controller during an operating mode in which switching operations occur and updates one or more operating parameters associated with driving the high power device. The operating parameters including turn-on parameters, turn-off parameters, and soft shutdown parameters. The variable strength driver circuit uses the turn-on parameters for turn-on phases for the output signal, uses the turn-off parameters for turn-off phases for the output signal, and uses the soft shutdown parameters for soft shutdown phases for the output signal. The update request adjusts current, voltage, and/or time for one or more phases of the turn-on, turn-off and/or soft shutdown parameters.

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event, and in response to detecting the fault event, causes the translator to brake using an electromagnetic technique. Braking includes causing the translator to stop reciprocating, by applying a force opposing an axial motion, which may occur within one cycle, or over many cycles. The fault event may include, for example, a fault associated with an encoder, a controller, an electrical component, a communications link, a phase, or a subsystem. The system includes a power electronics system configured to apply current to the phases. The system may use position information, current information, operating parameters, or a combination thereof to brake. Alternatively, the system need not use position information, current information, and operating parameters, and may brake the translator independent of such information.

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event, and in response to detecting the fault event, causes the translator to brake using an electromagnetic technique. Braking includes causing the translator to stop reciprocating, by applying a force opposing an axial motion, which may occur within one cycle, or over many cycles. The fault event may include, for example, a fault associated with an encoder, a controller, an electrical component, a communications link, a phase, or a subsystem. The system includes a power electronics system configured to apply current to the phases. The system may use position information, current information, operating parameters, or a combination thereof to brake. Alternatively, the system need not use position information, current information, and operating parameters, and may brake the translator independent of such information.