1845results about "Starter arrangements" patented technology

Disclosed herein is a method and system for initializing a rotating device such as an electronically commutated electric machine. The system comprises: an electric machine; a position sensor subsystem operatively connected to the electric machine configured to measure a position and transmit a position signal to a controller. The controller executes a method initializing position for the electric machine, the method comprising: establishing a sensor subsystem datum indicative of a measurement reference point for a sensor subsystem; obtaining a calibration value corresponding to a distance to a selected magnetic reference position for the electric machine, relative to the sensor subsystem datum; and measuring a position and calculating a position delta relative to an initial reference. The method also includes: estimating an offset from the sensor subsystem datum to an initial reference; determining an absolute position estimate of the electric machine relative to the magnetic reference position. The absolute position estimate is responsive to the calibration value, the position delta, and the offset from the sensor subsystem datum to the initial reference.

A process to start a brushless direct current motor with a multiphase stator winding is disclosed, in which, during rotor standstill, a plurality of current impulses is intruded on the stator winding, the current rise time until a current threshold is reached is measured in the stator winding with every current impulse and the rotor position is derived from the measured current rise times. A more precise determination of rotor position is achieved with lower control-related effort for a regulated sensorless start-up in that a plurality of test current impulses is successively intruded on the stator winding in such a way that the test current impulses generate stator flow vectors offset by the same angular increments over 360° electrically in the stator. The current rise time for each stator flow vector is measured in the total current of the stator winding and the phase position of the stator flow vector with the smallest current rise time is determined as the rotor position.

After the rotor position has been fixed prior to the start of a motor, the driving mode can be rapidly switched to sensorless driving and the motor can be started and controlled, by conducting current conversions in such a power supply pattern that increases the starting output torque of the motor, and controlling the inverter output voltage.

A motor apparatus, such as a DC brushless motor, is provided for the obtaining a position detection signal by detecting the intersection of the divided voltage of a bus voltage and three phases of the divided voltage of the three phases by a comparator which results in the central position of a flat portion. For the divided voltage for the three phases of the respective positive terminal of the comparator, the comparison voltage obtained by dividing the voltage between the divided voltage for the three phases of the following phase in the order and the divided voltage of the bus voltage is applied to the respective negative terminal. As the comparison voltage is phase shifted, the position can be detected by making a slant position ahead of the flat point of the intersection. When the comparison voltage obtained by dividing the voltage between the divided voltage for the three phases of the preceding phase in the order and the divided voltage of the bus voltage is applied to the respective negative terminal, as the phase is shifted in the opposite direction, the position can be detected by making a slant position near the flat point of the intersection. Thereby, the motor apparatus having an intersection whose position is to be detected, can be detected precisely even when the intersection is a flat crossing and is unclear.