Motor exciting device and motor exciting method and motor control device and motor control method

摘要

A motor control device which can determine a magnetic pole position for a magnetic pole position detector included in a permanent magnet motor (11) in which the reluctance torque proportion is larger than the magnet torque proportion is provided. In a permanent magnet synchronous motor (11) having multi-phase windings (111, 112,..., 11K) of N axes (N ≥ 2), the windings of optionally selected K axes (K ≤ N) are DC excited using corresponding independent power supplies. Namely, to determine the magnetic pole position of the motor (11), the first-axis windings (111) are DC excited by a first-axis exciting device (211); the second-axis windings (112) are DC excited by a second-axis exciting device (212) so as to generate a magnetomotive force equal in magnitude to and shifted in electrical phase by π/N from the magnetomotive force generated by the first-axis windings (111); - - -; and the Kth-axis windings (11K) are DC excited by a Kth-axis exciting device (21K) so as to generate a magnetomotive force equal in magnitude to and shifted in electrical phase by (K - 1)π/K from the magnetomotive force generated by the first-axis windings (111).