A motor controller circuit includes an electrical powertrain having a three phase input, a DC link and a three phase output, a controller including a processor and a memory, a first current sensor configured to sense a current at the three phase input, a second current sensor configured to sense a current at the three phase output, and a third sensor configured to sense a current at the DC link, and wherein the memory stores instructions configured to cause the processor to compare an operational model of the powertrain against a mathematical model of the powertrain and to detect a high impedance fault when a deviation between the operational model and the mathematical model exceeds a threshold.

A protection circuit is provided with: a suppression element that is coupled to a power source side of a main circuit and suppresses current flowing into the main circuit that drives a load; and a soft start circuit that is configured to gradually increase voltage of a control terminal of the suppression element when voltage is applied to the soft start circuit from a boosting circuit used for controlling the main circuit.

MCU (2001) determines whether at least one of double three-phase inverter (2030) or battery (2002) has a failure, or battery (2002) is fully charged, and switches control to be performed in inverter (2030) between all-phase shut off and three-phase short circuit based on a motor rotation speed of double three-phase motor (2050) when MCU (2001) determines that any one of inverter (2030) and battery (2002) has a failure, or battery (2002) is fully charged. Battery (2002) and inverter (2030) can be protected when current is inhibited from flowing from motor (2050) to battery (2002) due to a failure of inverter (2030) or battery (2002).

A failure diagnostic apparatus for current sensors of a 3-phase brushless AC (BLAC) motor may include: a 3-phase BLAC motor; current sensors each configured to measure a phase current of the 3-phase BLAC motor; a motor driving unit configured to drive the 3-phase BLAC motor; and a control unit configured to drive the 3-phase BLAC motor through the motor driving unit, periodically calculate a phase current error using the phase current fed back through each of the current sensors, and diagnose that a failure occurred in the current sensor of the corresponding phase, when an error count accumulated during a preset time reaches a preset value, based on the phase current error.

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.

A battery interrupter system including an electrical motor for a machine, at least one battery which powers an electrical system of a machine, a programable logic controller electrically connected to the electrical system and an ignition electrically connected to the programmable logic controller. The battery interrupter system also includes a button, which initiates the battery interrupter system, is connected to the programmable logic controller, at least one contactor electrically connected to the at least one battery and the programmable logic controller, wherein the programmable logic controller is configured to sends a signal to the at least one contactor to latch-in the contactor and enable an electrical connection between the at least one battery and the electrical system of the machine, and a detection sensor electrically connected to the programmable logic controller, wherein the detection sensor identifies operating conditions of the electrical system.

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.

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 solid-state circuit breaker (SSCB) with self-diagnostic, self-maintenance, and self-protection capabilities includes: a power semiconductor device; an air gap disconnect unit connected in series with the power semiconductor device; a sense and drive circuit that switches the power semiconductor device OFF upon detecting a short circuit or overload of unacceptably long duration; and a microcontroller unit (MCU) that triggers the air gap disconnect unit to form an air gap and galvanically isolate an attached load, after the sense and drive circuit switches the power semiconductor device OFF. The MCU is further configured to monitor the operability of the air gap disconnect unit, the power semiconductor device, and other critical components of the SSCB and, when applicable, take corrective actions to prevent the SSCB and the connected load from being damaged or destroyed and/or to protect persons and the environment from being exposed to hazardous electrical conditions.

A dual motor system includes a first motor providing a lower speed range and a second motor providing a higher speed range, wherein the motors are coaxially arranged and aligned on and drive a common shaft, and a motor control system controlling the speed of the first motor and engaging the second motor as needed. The first motor is a variable speed motor providing a lower two-thirds of a full speed range, and the second motor is an induction motor providing the upper one-third in the form of one or more discrete fixed speeds. The system may include a transformer including a first winding tap which provides a first higher speed, and a second winding tap which provides a second higher speed. The system may also include a flow control system for automatically controlling the speed of the motors for particular applications, such as flow control in a pool.