Patent ID: 8378604

Claim:
A DC brushless motor apparatus, comprising: a DC brushless motor ( 101 ), including: a first electrical machinery structure including a magnetic field winding and a magnetic circuit; a second electrical machinery structure including a magnetic pole; an angle position detecting device ( 103 ) for detecting a relative position of the first and second electrical machinery structures as the first electrical machinery structure is driven to rotate relative to the second electrical machinery structure, a detected position signal being transmitted to a motor drive control device ( 201 ) to provide a reference for controlling operation of the DC brushless motor ( 101 ); and a motor load detection device ( 102 ) for detecting a value of a load current of the DC brushless motor ( 101 ) and outputting a motor load detection signal to the motor drive control device; wherein the motor drive control device ( 201 ) is arranged to control an input voltage of the DC brushless motor ( 101 ) in response to said detected position and motor load detection signals, to an internal feedback gain setting of the motor drive control device ( 201 ), and to a running operation device ( 301 ) including a user interface, wherein the input voltage varies with the load current such that an increase in input voltage compensates for a decrease in load current resulting from increased inductive reactance of the magnetic field winding as a rotational speed of the DC brushless motor increases.