초록 ▼

The brushless motor has: a field unit having a rotor permanent magnet (12); three-phase driving windings (20A, 20B, and 20C) of the stator; driving transistors for supplying a power to the driving windings; a driving command unit (43) for generating sinusoidal driving command signals; and a driving

The brushless motor has: a field unit having a rotor permanent magnet (12); three-phase driving windings (20A, 20B, and 20C) of the stator; driving transistors for supplying a power to the driving windings; a driving command unit (43) for generating sinusoidal driving command signals; and a driving unit which supplies to the driving windings sinusoidal driving currents in accordance with the driving command signals. The driving command unit (43) consists of: a time interval measurement device (42) which measures timing intervals from a pulse signal of a rotation detector (41), the timing intervals being inversely proportional to the rotational speed of the rotor; and a driving command generation unit (43) which changes an estimated electric angle at time intervals responding to the measurement result of the time interval measurement device thereby to generate the sinusoidal driving command signals corresponding to the estimated electric angle.

대표청구항 ▼

[ What is claimed is:] [1.] A brushless motor comprising:a field means having a permanent magnet type rotor for producing P field poles (P is an even number integer not less than 2);K-phase driving windings (K is an integer not less than 2) fixed to a stator;driving commanding means for generating a

[ What is claimed is:] [1.] A brushless motor comprising:a field means having a permanent magnet type rotor for producing P field poles (P is an even number integer not less than 2);K-phase driving windings (K is an integer not less than 2) fixed to a stator;driving commanding means for generating a substantially sinusoidal driving command signal; anddriving control means for supplying a substantially sinusoidal driving current to said driving windings responding to said driving command signal,said driving commanding means comprising:rotation detecting means for obtaining a pulse signal in synchronization with rotation of said rotor;time interval measurement means for measuring a timing interval of said pulse signal; anddriving command generating means for estimating an estimated electric angle at an estimating interval shorter than said timing interval and responsive to a measurement result of said time interval measurement means, and generating the substantially sinusoidal driving command signal corresponding to said estimated electric angle.