Patent ID: 9602037
Date: 2017-03-21
CPC Classifications: H02P

Claim:
1. A motor drive device comprising: a power source terminal for connecting to a power source; a charging and discharging unit that performs charging and discharging, connected in series with the power source terminal; connecting terminals to be connected to each of primary and secondary excitation coils of an anti-symmetric two phase motor; and a drive control unit that has a plurality of switching elements, and that forms a first path for independently supplying power to each of the primary and secondary excitation coils from the power source terminal via the connecting terminals, by turning the plurality of switching elements on and off, and further forms a second path for independent regeneration of each residual energy remaining in the primary and secondary excitation coils from the respective primary and secondary excitation coils into the charging and discharging unit via the connecting terminals by turning these switching elements on and off, wherein the primary and secondary excitation coils have a phase period corresponding to cyclic change of inductance due to rotation of a rotor of the anti-symmetric two phase motor, the phase period of the primary excitation coil is shifted in phase from the phase period of the secondary excitation coil by 180 degrees, the first path includes a path of a first form for supplying electricity from the power source terminal to the primary excitation coil via the connecting terminals, and a path of a second form differing from the path of the first form, for supplying electricity from the power source terminal to the secondary excitation coil via the connecting terminals, the second path includes a path of a third form for regenerating residual energy remaining at the primary excitation coil from the primary excitation coil to the charging and discharging unit via the connecting terminals, and a path of a fourth form different from the path of the third form, for regenerating residual energy remaining at the second excitation coil from the secondary excitation coil to the charging and discharging unit via the connecting terminals, and with a predetermined number 1 phase as a starting point in a case where inductance of the primary excitation coil is increasing, the drive control unit repeats, synchronously with the inductance cycle of the primary excitation coil, a first electricity supply mode where electricity is supplied to the primary excitation coil by the path of the first form, a first regeneration mode where residual energy remaining at the primary excitation coil is regenerated by the path of the third form, a second electricity supply mode where electricity is supplied to the secondary excitation coil by the path of the second form, and a second regeneration mode where residual energy remaining at the second excitation coil is regenerated by the path of the fourth form, in this order.