Abstract: A method for recording the number of sterilizations of a piece for a medical device. The piece can be a motor and/or a handpiece. The piece includes a temperature sensor and/or a pressure sensor and/or a humidity sensor and/or an angular position. The method includes the following steps: inserting the piece into the sterilization camber; detecting the sterilization based on the temperature and/or the pressure and/or the humidity and/or the angular position in which the handpiece is received in the sterilization chamber by the temperature sensor and/or the pressure sensor (102) and/or the humidity sensor and/or the angular position sensor. This solution allows recording of the number of sterilizations of a handpiece and/or a motor for a medical device, in particular for a dental device.

Abstract: Surgical system, in particular a dental system including a surgical instrument, in particular a dental instrument and a device for controlling the electronic instrument. The device for controlling the electronic instrument includes a first electronic module. The instrument includes a rotary motor for driving the tool and a second electronic module. The rotary motor of the instrument is electrically powered by the first electronic module of the control device through the first electrical conductors dedicated to supply the rotary motor. The instrument is powered and/or electrically controlled by the first electronic module of the control device only through the second electrical conductors distinct from the first electrical conductors. The system also includes a management module of the second electrical conductors for sending on the second electrical conductors a number of signals larger to a number of second electrical conductors.

Abstract: A method for recording the number of sterilizations of a piece for a medical device. The piece can be a motor and/or a handpiece. The piece includes a temperature sensor and/or a pressure sensor and/or a humidity sensor and/or an angular position. The method includes the following steps: inserting the piece into the sterilization camber; detecting the sterilization based on the temperature and/or the pressure and/or the humidity and/or the angular position in which the handpiece is received in the sterilization chamber by the temperature sensor and/or the pressure sensor (102) and/or the humidity sensor and/or the angular position sensor. This solution allows recording of the number of sterilizations of a handpiece and/or a motor for a medical device, in particular for a dental device.

Abstract: A sensorless brushless motor control device includes a first amplification module common to all motor phases and generating an intermediary voltage signal, a voltage divider between each motor phase and a node on which the intermediary voltage signal is generated, and a computation unit. Each voltage divider generates a first corrected electromotive force with a predetermined average value. The computation unit controls the motor on the basis of the first corrected electromotive forces. By using only hardware components, the control device maintains the average of the corrected electromotive forces at the center of the analog acquisition zone of the computation unit.

Abstract: Surgical system, in particular a dental system including a surgical instrument, in particular a dental instrument and a device for controlling the electronic instrument. The device for controlling the electronic instrument includes a first electronic module. The instrument includes a rotary motor for driving the tool and a second electronic module. The rotary motor of the instrument is electrically powered by the first electronic module of the control device through the first electrical conductors dedicated to supply the rotary motor. The instrument is powered and/or electrically controlled by the first electronic module of the control device only through the second electrical conductors distinct from the first electrical conductors. The system also includes a management module of the second electrical conductors for sending on the second electrical conductors a number of signals larger to a number of second electrical conductors.

Abstract: Sensorless brushless motor control device, comprising: a first amplification module common to the motor phases and laid out for generating an intermediary voltage signal, a voltage divider between each motor phase and a node on which the intermediary voltage signal is generated, wherein each voltage divider is laid out for generating a first corrected electromotive force having a predetermined average value, wherein the computation unit is laid out for controlling the motor on the basis of these first corrected electromotive forces. By using hardware means, this control device enables the average of the corrected electromotive forces to be maintained at the center of the analog acquisition zone of the computation unit.

Abstract: A surgical device includes a manual instrument provided with a rotary motor for driving a tool and at least one sensor for determining at least one operating parameter of the motor (1). The device further includes an electronic servo-control module of the motor, and a flexible connection for electrically connecting the instrument to the electronic module. The instrument includes a digital electronic circuit for processing output signals of the sensor and transmitting them to the electronic module through the flexible connection.

Abstract: Surgical device, in particular a dental device, comprising: a manual instrument (100) provided with a rotary motor (1) for driving a tool and at least one sensor (H1, H2) for determining at least one operating parameter of the motor (1), an electronic servo-control module (3) of the motor (1), a flexible connection (2) for electrically connecting the instrument (100) to the electronic module (3). The instrument (100) comprises a digital electronic circuit (4) for processing output signals (cH1, sH2) of the sensor (H1, H2) and transmitting them to the electronic module (3) through the flexible connection (2).

Abstract: This method consists in supplying at least a first alternating signal, at a determined frequency, to one end of a stator coil and recuperating a measurement signal at a second end of said coil, said measurement signal being provided to electronic processing means, which are arranged to extract data relating to a periodic variation of the effective inductance of the stator coil. This variation is a function of the angular position of the rotor. By alternately carrying out such a measurement on the stator coils, three periodic curves can be extracted (SPCA, SPCB, SPCC) defining a zigzag curve (70) allowing the angular position of the rotor to be determined.

Abstract: This method consists in supplying at least a first alternating signal, at a determined frequency, to one end of a stator coil and recuperating a measurement signal at a second end of said coil, said measurement signal being provided to electronic processing means, which are arranged to extract data relating to a periodic variation of the effective inductance of the stator coil. This variation is a function of the angular position of the rotor. By alternately carrying out such a measurement on the stator coils, three periodic curves can be extracted (SPCA, SPCB, SPCC) defining a zigzag curve (70) allowing the angular position of the rotor to be determined.

Abstract: The present invention concerns a device (20) for controlling an electric motor (1) including a rotor (6) and at least three stator coils (2, 3, 4) connected between three connection terminals, means (5) for providing three control signals (Ua, Ub, Uc) to said connection terminals, and means (22) for dectecting said rotor angular postion. Said dectecting means include measuring means (24) designed to be connected to the motor, such that the means form with said coils at least two oscillating circuits supplying two respective signals (U1, U2) at two measurement frequencies respectively which are themselves periodic functions of said rotor angular position, and means (26) for calculating a single value corresponding to the two measurement frequencies, this value being the desired angular position.

Abstract: The display system includes a device for memorizing the time when each competitor (C.sub.i) in a sequential start race passes a detector (D.sub.k); a device (12) for classifying competitors (C.sub.j) as they pass each detector (D.sub.k) to establish for each detector (D.sub.k) a list of competitors according to their time; and a processing device (20) which operates when a competitor (C.sub.i) passes a detector (D.sub.k): to determine the instantaneous ranking of competitor (C.sub.i) reaching the detector (D.sub.k) by comparing his time of passage with the times of passage of a plurality of previously classified competitors (C.sub.j), to calculate the time differences R and A between the time of passage of competitor (C.sub.i) and the times of passage of competitors (C.sub.j) of immediately adjacent rankings, to convert each time difference R and A into a distance using a conversion function f, and to display, in a predetermined display area (28), a symbol (30) representing competitor (C.sub.

Abstract: This arrangement enables the identification of a plurality of vehicles (4) and determination of the instant of their passing over a reference line (30). It includes a moving station (1) mounted on the vehicle and a fixed station (2) arranged alongside a racetrack (3). The fixed station broadcasts a low-frequency synchronization signal of period T which is received by the moving station, the latter in turn broadcasting a series of signals of duration Tn located in a predetermined rank relative to the time t.sub.o marking each start of period T. Conjointly the moving station allocates an identification code peculiar to a given moving object to each signal Tn. The signals received by the fixed station are stored in a memory which for each signal memorizes its absolute time, its association with a given vehicle and its amplitude. The arrangement is used for motor vehicle races which include a large number of competitors.

Abstract: A method and an installation permit the electronis transmission of data between a master station and slave stations and the simultaneous return of data in the direction of the master station, and this by means of a bus having only two conductors. The digital signals emitted by the master station are at the same time control signals feeding in power to the slave stations. The bits of these signals are of a shape such that they present dead zones during which these signals do not have any effect and during which one can interrupt the faithful transmission, while putting at high impedance one of the conductors of the bit, which allows a momentary alteration of the signal. Such an alteration is obtained by loading strongly the conductor put at high impedance, the presence or the absence of such an alteration constituting the data which has to be transmitted from one slave station to the master station.