Abstract: A sinusoidal signal is superimposed on a current command value of a q-axis (torque shaft) supplied from a host, and according to the resulting current command value, the output voltage of a power converter is controlled. For the calculation of the superimposed signal added to the current command value of the q-axis, with the use of the ripple component information of induced voltage coefficients of the d-axis and q-axis of the rotating coordinate system of a permanent magnet motor, the current command values of the d-axis and q-axis, an average value of induced voltage coefficients of the d-axis, and inductance values of the d-axis and q-axis, the sinusoidal superimposed signal is calculated and added to the above-described current command value of the q-axis.

Abstract: A sinusoidal signal is superimposed on a current command value of a q-axis (torque shaft) supplied from a host, and according to the resulting current command value, the output voltage of a power converter is controlled. For the calculation of the superimposed signal added to the current command value of the q-axis, with the use of the ripple component information of induced voltage coefficients of the d-axis and q-axis of the rotating coordinate system of a permanent magnet motor, the current command values of the d-axis and q-axis, an average value of induced voltage coefficients of the d-axis, and inductance values of the d-axis and q-axis, the sinusoidal superimposed signal is calculated and added to the above-described current command value of the q-axis.

Abstract: An outer rotor type brushless motor comprising an outer rotor having permanent magnets fixed onto an inner periphery of a rotor yoke, a stator including a stator core having a plural of magnetic pole portions protruded on an outer periphery thereof and coils wound on the magnetic pole portions, a cylindrical boss disposed on an inner periphery of an annular portion of the stator core, a rotational shaft extending along an axis of the boss and rotationally supported on the boss through a bearing with a leading end of the shaft having a center portion of the rotor yoke fixed thereto and a mounting plate fixed onto an outer periphery of the boss wherein the boss is formed of resin mold and extending through a hole in the mounting plate and fixed thereto and the annular portion of the stator core is mounted on and fixed to a rising portion on the inner periphery of the mounting plate.

Abstract: An outer rotor type brushless motor comprising an outer rotor having permanent magnets fixed onto an inner periphery of a rotor yoke, a stator including a stator core having a plural of magnetic pole portions protruded on an outer periphery thereof and coils wound on the magnetic pole portions, a cylindrical boss disposed on an inner periphery of an annular portion of the stator core, a rotational shaft extending along an axis of the boss and rotationally supported on the boss through a bearing with a leading end of the shaft having a center portion of the rotor yoke fixed thereto and a mounting plate fixed onto an outer periphery of the boss wherein the boss is formed of resin mold and extending through a hole in the mounting plate and fixed thereto and the annular portion of the stator core is mounted on and fixed to a rising portion on the inner periphery of the mounting plate.