초록 ▼

A motor control apparatus and a motor unit having such a motor control apparatus according to the present invention are constructed to detect a terminal voltage for switching elements of the same phase in a dead time period by a voltage output circuit 10, and to detect the instant when the sign of a

A motor control apparatus and a motor unit having such a motor control apparatus according to the present invention are constructed to detect a terminal voltage for switching elements of the same phase in a dead time period by a voltage output circuit 10, and to detect the instant when the sign of a phase current changes from the detected terminal voltage by a current sign change detection part 11. Based on the phase of a current sign change timing provided from the current sign change detection part 11 and the phase of a phase applied voltage, the first applied voltage control circuit 14 generates a phase applied voltage command to a switching element modulation circuit 9. Such arrangement makes it possible to provide motor continuous energization or motor energization drive near to 180 degrees at high efficiency, without the provision of any current sensors.

대표청구항 ▼

[ What is claimed is:] [1.] A motor control apparatus comprising:an upper switching element group having a plurality of switching elements which form current paths to coils of respective phases of a motor;a lower switching element group having a plurality of switching elements which form current pat

[ What is claimed is:] [1.] A motor control apparatus comprising:an upper switching element group having a plurality of switching elements which form current paths to coils of respective phases of a motor;a lower switching element group having a plurality of switching elements which form current paths from said coils of a respective phases of said motor;a plurality of diodes, each said diode being connected in reverse parallel with a corresponding one of said switching elements of said upper and lower switching element groups;switching element modulation means for providing a conduction/cut-off signal to said upper and lower switching element groups thereby to cause switching elements of the same phase to perform a switching action so that said switching elements conduct or are cut off with the provision of a simultaneous cut-off period, for the application of voltages to said coils of said respective phases of said motor;voltage output means for detecting terminal voltage values of said coils of said respective phases connected between said switching elements of respective phases in said upper and lower switching element groups, and for providing said detected terminal voltage values;at least one current sign change detection means for detecting, from said conduction/cut-off signal of said switching element modulation means and said terminal voltage values detected by said voltage output means, a timing of the sign change of a phase current, and for providing a current sign change timing signal; andfirst applied voltage control means for issuing, based on said current sign change timing signal and applied voltage values of said coils of said respective phases, a phase applied voltage command to said switching element modulation means.