Abstract: The present invention relates to an apparatus for testing a bearing, as well as systems including such an apparatus. In one instance, the apparatus allows for torsional losses of a bearing to be determined in a highly sensitive manner. Results can be determined in a controlled environment, as the system can include an environmental enclosure to encapsulate the testing apparatus.

Abstract: Provided is a dynamometer system control device capable of stable and highly responsive control. This dynamometer system control device is provided with a torque control device which outputs a torque command signal on the basis of an output signal (LC_det) of a load cell, and with a characteristic vibration suppression circuit which corrects the torque command signal to suppress the characteristic vibration of an oscillator and which inputs said signal to an inverter as a control input signal. The circuit is provided with a differential compensator which performs a differentiation operation on a load cell approximation signal (Pmdl_det) calculated using an approximation equation in a secondary delay canonical form in a vibration output calculation unit, and with a subtractor which corrects the torque command signal by subtracting the output signal from the compensator from the torque command signal (Tdy_ref).

Abstract: A surgical instrument (12) includes a tool for screwing in a surgical implant or for cutting a thread in human bone tissue with thread tap. Also included is a unit (2) for supplying power and controlling the speed of an electric motor included in the tool, for example a d.c. motor (1). Detection members (7, 8) transmit signals (i1), dependent on the torque of the tool, to display members which comprise a computer unit (9) with screen (10). Displayed on the screen is a curve which shows the torque in relation to the torsional angle position. A curve or curves displayed in this way form(s) the basis for assessing the quality of the implant or of the bone tissue.