A fan motor stopping apparatus includes a conversion circuit that converts alternating-current voltage supplied from an alternating-current power supply into direct-current voltage, a smoothing capacitor that is connected to a fan motor included in an air conditioner and smooths the direct-current voltage from the conversion circuit, a voltage detection circuit that detects a voltage across the smoothing capacitor, and a fan motor shutdown circuit that suspends the fan motor in operation when the voltage detection circuit detects a voltage less than or equal to a threshold that is preset for suspending the operation of the fan motor.

An electronically commutated motor driving module for driving a motor includes a voltage detector, an electronically commutated motor driver, a current detector, a voltage converter, and a controller. The voltage detector detects supply voltage to generate a voltage detection signal. The electronically commutated motor driver is supplied by the supply voltage to generate, according to an electronically commutated signal, an operating current for driving the motor. The current detector detects the operating current to generate a current detection signal. The voltage converter converts the supply voltage into an internal voltage. The controller is supplied by the internal voltage and generates the electronically commutated signal according to a plurality of control parameters. When the controller determines that a specific event has happened according to the control parameters, the controller stops generating the electronically commutated signal and then stores the control parameters.

An electric powered work machine includes an inverter circuit, a power-source-side switching element, a power-source-side resistor, at least one circuit-side resistor, and a fault determiner. The power-source-side switching element is arranged between a direct-current power source and the inverter circuit. The power-source-side resistor is connected in parallel to the power-source-side switching element. The circuit-side resistor is connected to the inverter circuit in such a state that electrical conduction is possible between a positive side and a negative side of the direct-current power source in the inverter circuit in a case where semiconductor switching elements in the inverter circuit are all OFF. The fault determiner determines whether the switching elements are short-circuited based on a voltage at a connection point between the power-source-side switching element and the inverter circuit.

A method of feedthrough and overcurrent protection of a sealed compressor used in a transport climate control system (“TCCS”) is provided. The TCCS includes a climate control circuit with a sealed compressor. The sealed compressor includes an outer housing and an electrical motor within the outer housing. The method includes operating the sealed compressor to compress a working fluid by supplying electrical power to the electric motor of the sealed compressor via a sealed electrical feedthrough in the outer housing of the sealed compressor. The method also includes detecting an operating parameter of the sealed electrical feedthrough, and determining whether the sealed electrical feedthrough is in a melting condition based on the detected operating parameter. Also, the method includes adjusting operation of the climate control circuit upon determining that the sealed electrical feedthrough is in the melting condition until the sealed electrical feedthrough is no longer in the melting condition.

A motor control device includes at least one power converter. The at least one power converter is connected between a DC power supply and a motor. The at least one power converter converts a DC electric power into a multi-phase AC electric power by operating a plurality of switching elements and supplies the multi-phase AC electric power to the motor. The motor control device calculates a command value for operating the at least one power converter to control electrical conduction to the motor. The motor control device determines an overcurrent fault when a value of a current flowing through the at least one power converter or a motor winding of the motor exceeds an overcurrent threshold value. The motor control device estimates or detects a power supply current that is a direct current flowing between the DC power supply and the at least one power converter.

An opening/closing body drive device includes: a motor which opens or closes an opening/closing body; a drive unit which rotates the motor; and a control unit which controls the drive unit. The drive unit includes a first and second integrated circuits having first and second switching elements and third and fourth switching elements which are connected to each other in series with respect to a power source and connection points of which are connected to one and the other terminals of the motor, respectively. The control unit turn-on drives the first and fourth switching elements or the second and third switching elements when driving the motor to be rotated forward or reversely. The control unit turn-on drives any one of the second and third switching elements when braking the motor during the forward rotation of the motor.

A power system with an electric rotating machine providing an operation of power generation and power running, a switching circuit providing electricity for each phase, by switching a plurality switching elements ON/OFF by the electric rotating machine, a battery section connected to the switching circuit, and switches on electrical pathway, between the switching circuit and the battery section. A power shutoff section to shutoff an electrical pathway when an overcurrent flows in, at least one of the electric rotating machine and the switching circuit. Power control devices are provided with an overcurrent determination which determines that an overcurrent has occurred, based on results of, a first determination that determines a current flow has increased to a predetermined over current threshold, and a second determination that determines that current flow has decreased thereafter, and a switch control that switches the switches open based on a determined result of the overcurrent determination.

The present disclosure provides a motor driving device capable of inhibiting unstable driving of a motor even in the occurrence of a sudden fluctuation of a power supply voltage. The motor driving device includes a power supply voltage sudden fluctuation detector, a power supply voltage fluctuation width generator and a current limit value setting unit. The power supply voltage sudden fluctuation detector detects a sudden fluctuation in a direction in which the power supply voltage rises. The power supply voltage fluctuation width generator detects a fluctuation width of the power supply voltage. When the sudden fluctuation is detected by the power supply voltage sudden fluctuation detection unit, a current limit value of the current limit value setting unit is reduced from a normal value and corrected by the correction width corresponding to the fluctuation width of the detected power supply voltage.

A drive circuit for driving an electronically commutated motor contains a DC voltage intermediate circuit, and an inverter which is connected to the latter and has a bridge circuit containing a plurality of transistors, to which the motor phases of a motor configuration containing the motor can be connected. For detecting an insulation fault in the motor configuration, a positive or negative transistor of the inverter is switched on, while all other transistors of the inverter are switched off before all transistors of the inverter are switched off. A motor phase voltage of a selected motor phase of the motor phases with respect to a reference potential is then captured, while all transistors of the inverter remain switched off in order to determine whether there is an insulation fault on the motor phase on a basis of a voltage profile of the motor phase voltage.

A system (1) has a control device (10) with central electronics (11) designed for connection and operation of differently coded electric motors (En), with different motor characteristics (Mn) and/or power classes (Ln), to a device connection (12) of the control device (10). The at least one electric motor (En) is selectable from a number (n) of electric motor (En), that can be connected as intended, has a coding element (Kn). The central electronics (11) have a coding capture device (2) to recognize, via coding element (n), the motor characteristics (Mn) and/or the power class (Ln) of the respective currently connected electric motor (En).