Disclosed is a motor protection device (1). The motor protection device (1) includes an interrupter unit (11, Q1, Q2) for electrically connecting a power supply (Vcc) and an electric motor (M) in an operation mode and electrically disconnecting the power supply (Vcc) and the electric motor in an alternative overload mode. The motor protection device further includes an overload detection unit (12). The overload detection unit (12) is configured to monitor a motor current and to control the interrupter unit (11, Q1, Q2) to switch from the operation mode into the overload mode if the motor current indicates an overload condition of the electric motor (M) in the operation mode. The motor protection device (1) further includes a recovery detection unit (13). The recovery detection unit (13) is configured to monitor a motor temperature and to control the interrupter unit (11, Q1, Q2) to switch from the overload mode back into the operation mode if the motor temperature indicates a recovery from the overload condition.

Disclosed is a motor protection device (1). The motor protection device (1) includes an interrupter unit (11, Q1, Q2) for electrically connecting a power supply (Vcc) and an electric motor (M) in an operation mode and electrically disconnecting the power supply (Vcc) and the electric motor in an alternative overload mode. The motor protection device further includes an overload detection unit (12). The overload detection unit (12) is configured to monitor a motor current and to control the interrupter unit (11, Q1, Q2) to switch from the operation mode into the overload mode if the motor current indicates an overload condition of the electric motor (M) in the operation mode. The motor protection device (1) further includes a recovery detection unit (13). The recovery detection unit (13) is configured to monitor a motor temperature and to control the interrupter unit (11, Q1, Q2) to switch from the overload mode back into the operation mode if the motor temperature indicates a recovery from the overload condition.

A motor apparatus for a switch drive of an electric switch has an electric motor and a controller for controlling the electric motor. The controller has: a rectifier unit for rectifying a supply voltage of the motor apparatus, if the supply voltage is an alternating voltage, and for reverse polarity protection if the supply voltage is a direct voltage, a voltage measurement unit for detecting the supply voltage or a rectifier output voltage of the rectifier unit, a switch unit for generating a drive voltage for the electric motor from the supply voltage or from the rectifier output voltage and a control unit for controlling the switch unit as a function of the supply or rectifier output voltage detected. The electric motor is operable by direct current and the switch unit generates a drive direct voltage for the electric motor.

A motor apparatus for a switch drive of an electric switch has an electric motor and a controller for controlling the electric motor. The controller has: a rectifier unit for rectifying a supply voltage of the motor apparatus, if the supply voltage is an alternating voltage, and for reverse polarity protection if the supply voltage is a direct voltage, a voltage measurement unit for detecting the supply voltage or a rectifier output voltage of the rectifier unit, a switch unit for generating a drive voltage for the electric motor from the supply voltage or from the rectifier output voltage and a control unit for controlling the switch unit as a function of the supply or rectifier output voltage detected. The electric motor is operable by direct current and the switch unit generates a drive direct voltage for the electric motor.

An electric motor system having substantially independent hardware-based and software-based pathways for detecting and initiating responses to fault conditions, such as over-current conditions, in an electric motor which is powered by a power inverter which is controlled by a power module and a microprocessor. Each pathway involves comparing a voltage, which is representative of an electric current flowing to the motor, to a predetermined maximum voltage, and if the former exceeds the latter using hardware or software to initiate shutting off the motor, such as by shutting off the power inverter. When one pathway detects a fault condition it may notify the other pathway, and the notified pathway may also initiate shutting off the motor.

A multifunctional signal isolation converter (10) is arranged in a safe area (20), and is applied to an electronic apparatus (40) arranged in a dangerous area (30). The multifunctional signal isolation converter (10) includes a microprocessor (108) and a power supply unit (116). The microprocessor (108) determines whether internal functions of the multifunctional signal isolation converter (10) are normal or not to obtain a first judgment value. The electronic apparatus (40) sends an input signal (42) to the microprocessor (108). The microprocessor (108) determines whether functions of the electronic apparatus (40) are normal or not to obtain a second judgment value according to the input signal (42). The microprocessor (108) controls whether the power supply unit (116) supplies a driving power (122) to the electronic apparatus (40) or not according to the first judgment value and the second judgment value.

A device having an armature including a main wall; a rotary part intended to be mechanically coupled to a control shaft of an electrical switching unit; a bar integral with the rotary part and able to rotate between a first position and a second position and extending through a slot in the main wall; a position sensor having a movable contact pushed into a retracted position by the bar when the bar is in the first position; a stabilizing device having a resilient strip extending along the slot in order to exert a retaining force on the bar when it is in the first position.

In an opening/closing body control device, catching determination part (15) determines whether or not a catching in an opening/closing body has occurred based on a value of current that flows in a motor; a plurality of sensors (51 to 53) disposed to be shifted by predetermined electrical angles detect positions of magnetic poles of the motor (40); a counterclockwise pattern storage unit (14) stores a counterclockwise pattern which is a pattern corresponding to outputs of the plurality of sensors (51 to 53) and a predetermined shift in the electrical angles; and drive command part (16) controls the drive circuit (30) using a clockwise pattern or the counterclockwise pattern based on the outputs of the plurality of sensors (51 to 53), and in a case where the catching determination part (15) determines that a catching has occurred, controlling the drive circuit (30) in a predetermined pattern for eliminating the catching.

In an opening/closing body control device, catching determination part (15) determines whether or not a catching in an opening/closing body has occurred based on a value of current that flows in a motor; a plurality of sensors (51 to 53) disposed to be shifted by predetermined electrical angles detect positions of magnetic poles of the motor (40); a counterclockwise pattern storage unit (14) stores a counterclockwise pattern which is a pattern corresponding to outputs of the plurality of sensors (51 to 53) and a predetermined shift in the electrical angles; and drive command part (16) controls the drive circuit (30) using a clockwise pattern or the counterclockwise pattern based on the outputs of the plurality of sensors (51 to 53), and in a case where the catching determination part (15) determines that a catching has occurred, controlling the drive circuit (30) in a predetermined pattern for eliminating the catching.

A collision stress releasing device reversely rotates a feed motor by a return amount set in a return amount setter based on a contact position of a movement unit or a collision detection position regarded as a contact position. Generally, a large error does not occur even when the collision detection position is regarded as the contact position, but when the movement unit or the colliding member has low rigidity, a control of setting a return amount in response to the speed of the movement unit or a control of estimating an actual contact position from a rise curve of a load after a collision is more desirable.