Patent ID: 6430463
Filing Date: 2002-08-06
Classification: B23P,B25B,G05B,G05D,Y02P

Abstract:
An apparatus for controlling torque delivered by a transducerless, power driven tool comprising:a power driven tool; a variable frequency drive (VFD) providing power to the power driven tool; a controller connected to the VFD that selects a target frequency for the power the VFD provides the tool, wherein the controller also monitors the power the VFD is providing the tool; a microprocessor connected to the controller programmed to provide a specific power at a given frequency, programmed with a power to torque curve for each given frequency, programmed to calculate the torque the tool is providing using the curve, and programmed to compare the calculated torque to a target torque; and means for turning off the power the VFD is providing the tool when the calculated torque reaches the target torque.