Driving apparatus and stop position detection method

摘要

A driving apparatus including an inverter unit for energizing the coil by switching ON and OFF of the switching element, an energization pattern determination unit for selecting a plurality of energization patterns, each of which indicates a direction of a current that flows through the coil, one by one when driving of a motor is started, and energizing the coil by switching ON and OFF of the switching element based on a selected energization pattern at a duty ratio corresponding to a value of a maximum current capable of being supplied by the power supply apparatus, a current applied time measurement unit for measuring an energization time, which is a time until a value of the current flowing through the coil reaches a predetermined target current value for each energization pattern, and a rotor stop position estimation unit for estimating a position at which the rotor stops.

主权项

1. A driving apparatus, which drives a motor by supplying power from a power supply apparatus to the motor having a stator around which a plurality of coils are wound and a rotor, comprising:
an inverter unit, having a switching element provided for each coil, configured to energize the coil by switching ON and OFF of the switching element; an energization pattern determination unit configured to select from a plurality of energization patterns one by one, each of which indicates a direction of a current that flows through the coil, when driving of the motor is started, and energizing the coil by switching ON and OFF of the switching element based on a selected energization pattern at a duty ratio corresponding to a value of a maximum current capable of being supplied by the power supply apparatus only for a time for which the rotor does not rotate; a current applied time measurement unit configured to measure an energization time, which is a time until a value of the current flowing through the coil reaches a predetermined target current value for each energization pattern; and a rotor stop position estimation unit configured to:
compare a plurality of energization times corresponding to the plurality of energization patterns, which are measured by the current applied time measurement unit,select an energization pattern corresponding to a smallest energization time among the plurality of energization times, andestimate that the rotor stops at a position corresponding to the selected energization pattern corresponding to the smallest energization time.