A power tool system includes a battery pack, a charger connectable to the battery pack, and a power tool body connectable to the battery pack. The battery pack includes a battery pack memory that stores identification information in a smallest unit allowing for communication with the charger and the power tool body. Each of the charger and the power tool body includes a device memory that stores at least one piece of identification information of a usable battery pack. Each of the charger and the power tool body or the battery pack includes a determination unit that determines whether or not the at least one piece of identification information stored in the device memory includes the identification information stored in the battery pack memory.

A system and method to detect an onset of motor rotation for an induction motor. The system and method involves monitoring a power supplied to a motor via a sensor, determining a power quantity based on the power monitored by the sensor, detecting an envelope of the power quantity, detecting an onset of rotation of the motor when an amplitude of the envelope has increased, and inhibiting power flow to the motor when the onset of rotation does not occur within a predetermined time period or logging a first time period of the detected onset of rotation of the motor for use in monitoring the condition of the motor. The power quantity can be a current vector magnitude or an instantaneous power corresponding to the supplied power.

A method is provided for determining an operational readiness state of an electric motor, a pump motor for pumping an operating fluid, for example, an aqueous urea solution, in a vehicle. The method includes applying an electric drive voltage to the electric motor according to a prescribed drive voltage curve in order to drive a rotor of the electric motor to rotate through a prescribed angle of rotation, detecting a response behavior of the electric motor, and determining the state of the electric motor based on the results determined in step b).

Controllers for controlling hybrid motor drive circuits configured to drive a motor are provided herein. A controller is configured to drive the motor using an inverter when a motor commanded frequency is not within a predetermined range of line input power frequencies, and couple line input power to an output of the inverter using a first switch device when the motor commanded frequency is within the predetermined range of line input power frequencies.

A motor starter apparatus includes at least one semiconductor switch configured to selectively couple a power source to a motor, at least one current sensor configured to generate a current sense signal indicative of a current provided via the at least one semiconductor switch, and a control circuit coupled to the at least one current sensor and configured to cause the at least one semiconductor switch to momentarily couple the power source to the motor and identify a fault based on a behavior of the current sense signal in response to the momentary coupling. The control circuit may be configured to identify the fault responsive to detecting that a rate of change of the current in response to the momentary coupling meets a predetermined criterion.

The invention relates to the field of alternating current electric machines and is intended for restoring winding insulation to its original parameters. According to the present method of drying the windings of an electric machine, a direct current having a magnitude of 10-60% of the nominal value of the current intensity in the windings is passed through the windings for intervals of 1-10 seconds. The active direct current intervals are alternated with pauses, which differ from said intervals by 0.5-1.5 times. In one embodiment of the invention, for the purpose of passing direct current through the windings, an intentionally small direct voltage is applied to the winding ends and is increased until a predetermined direct current intensity is reached. In another embodiment, the resistance of the insulation is determined during the pauses and once it has reached a given value, current is no longer supplied. The invention provides for the more rapid drying of winding insulation without the risk of damage to the insulation material.

Device for operating an electric motor, comprising a detection unit for detecting zero-crossings and phase angles of applied phase-shifted sinusoidal voltage phases of a multi-phase power supply network; and a switching unit for connecting half-waves of the applied sinusoidal voltage phases through by means of semiconductor switches in accordance with switching patterns applied to the semiconductor switches, said patterns being synchronised with the detected phase angles and zero-crossings, to generate phase-shifted quasi-sinusoidal voltage phases which are applied directly to the electric motor.

A motor capacitor verification unit includes a capacitor selection section coupled to an electric motor employing a motor capacitor for its operation that connects the motor capacitor for verification testing. Also included is a capacitor testing section coupled to the capacitor selection section that evaluates the motor capacitor for operation with the electric motor. Further included is an AC power control section coupled to the capacitor testing section and that only permits application of an AC operating voltage to the electric motor and the motor capacitor after a successful motor capacitor verification as required for electric motor operation. An electric motor operating system, an HVAC operating system and methods of operating an electric motor, retrofitting a motor capacitor verification unit to an electric motor and manufacturing a motor capacitor verification unit for use with an electric motor are also provided.

A power supply system having a wireless security module for vehicles is provided. The power supply system comprises a battery module, a power management module, an energy management module and the wireless security module. The battery module powers a starting motor of a vehicle. The power management module is used to receive a power from a power generating device. The power management module transmits the power of the power generating device into the battery module. The power management module comprises a monitoring unit and a controlling unit. The monitoring unit is used to monitor a voltage value of the battery module. When the voltage value monitored is equal to a minimum setting, the power management module is used to prevent the battery module from powering the starting motor. When the voltage value monitored is equal to a maximum setting, the power management module stops powering the battery module. The controlling unit is used to control a current value outputted from the battery module. Furthermore, when the voltage value of the battery module is equal to the maximum setting, the energy management module is used to receive a power from the power generating device. The power is transmitted into the vehicle by the energy management module.

Controllers for controlling hybrid motor drive circuits configured to drive a motor are provided herein. A controller is configured to drive the motor using an inverter when a motor commanded frequency is not within a predetermined range of line input power frequencies, and couple line input power to an output of the inverter using a first switch device when the motor commanded frequency is within the predetermined range of line input power frequencies.