Abstract: The present invention provides a method and system for controlling the temperature of an electric motor by adjusting the electric losses in the motor. In an embodiment, the required load on the motor is determined and a first motor voltage is provided to meet the required load. A predetermined temperature set point for the motor is compared against the temperature of the motor and based on the temperature of the motor and the predetermined temperature set point, a secondary motor voltage is determined. The motor voltage may then be adjusted based on the calculated voltage and the motor load measurement adjusted based on the measured motor speed and actual motor voltage.

Abstract: The present invention provides a method and system for controlling the temperature of an electric motor by adjusting the electric losses in the motor. In an embodiment, the required load on the motor is determined and a first motor voltage is provided to meet the required load. A predetermined temperature set point for the motor is compared against the temperature of the motor and based on the temperature of the motor and the predetermined temperature set point, a secondary motor voltage is determined. The motor voltage may then be adjusted based on the calculated voltage and the motor load measurement adjusted based on the measured motor speed and actual motor voltage.

Abstract: The present invention provides a method and system for controlling the temperature of an electric motor by adjusting the electric losses in the motor. In an embodiment, the required load on the motor is determined and a first motor voltage is provided to meet the required load. A predetermined temperature set point for the motor is compared against the temperature of the motor and based on the temperature of the motor and the predetermined temperature set point, a secondary motor voltage is determined. The motor voltage may then be adjusted based on the calculated voltage and the motor load measurement adjusted based on the measured motor speed and actual motor voltage.

Abstract: The present invention provides a method and system for controlling the temperature of an electric motor by adjusting the electric losses in the motor. In an embodiment, the required load on the motor is determined and a first motor voltage is provided to meet the required load. A predetermined temperature set point for the motor is compared against the temperature of the motor and based on the temperature of the motor and the predetermined temperature set point, a secondary motor voltage is determined. The motor voltage may then be adjusted based on the calculated voltage and the motor load measurement adjusted based on the measured motor speed and actual motor voltage.

Abstract: A method of detecting the state of a gap between an electrode and a workpiece in electrical discharge machining (EDM) equipment, the method including the steps of: prior to generating an electrical discharge to remove material from the workpiece, applying a low energy checking pulse across the gap during a checking phase period (Tc); and inferring a short circuit gap state when the gap current exceeds a current threshold (IT).

Abstract: A method of detecting the state of a gap between an electrode and a workpiece in electrical discharge machining (EDM) equipment, the method including the steps of: prior to generating an electrical discharge to remove material from the workpiece, applying a low energy checking pulse across the gap during a checking phase period (Tc); and inferring a short circuit gap state when the gap current exceeds a current threshold (IT).

Abstract: A method of sensing contact between a first member (606, 908) and a second (608, 910) member in a computer numerical control machine, wherein the position of at least one of the first member and the second member is controlled by one or more servo mechanisms, the method including the steps of: causing at least one of the first member and the second member to be driven towards the other; monitoring an error signal in one of the servo mechanisms; and detecting when the error signal exceeds a predetermined threshold.

Abstract: A method of computing imbalance in a motion control system is disclosed. The motion control system includes an object mounting mechanism for holding and rotating the object about a first axis; an object positioning mechanism for displacing the object mounting mechanism; an object positioning drive for driving the object positioning mechanism; and one or more rotation detection devices for generating an output signal indicative of the rotation of the object about the first axis. The method includes the steps of computing an object rotation signal indicative of the speed and phase of the object about the first axis from the rotation detection devices' output signal; demodulating an output signal from the drive with the object rotation signal to derive a demodulated output signal that is synchronous with rotation of the object about the first axis; and computing the magnitude and phase of the object imbalance from the demodulated output signal.

Abstract: A computer numerically controlled (CNC) machine tool is provided in which a cutting tool is movable along a programmed path determined by a part program in a programmable control unit (PCU). A trajectory interpolator receives high level motion commands and a feedrate specification from the PCU to produce interpolated position commands. A position controller controls movement of the cutting tool in response to the interpolated position commands. The machine tool further includes a handwheel and a manual pulse generator (MPG) which can be used in MPG feed mode to control movement of the cutting tool incrementally along the programmed path in either the forward or reverse direction. In MPG feed mode, an MPG feed specification from an MPG position counter is superimposed onto the feedrate specification in the trajectory interpolator.