Enhanced efficiency motor and drive circuit

A drive circuit (10, 80, 104, 110, 134) for a motor comprising: a power source (12, 82, 120, 136) having a first pole (16, 140) and a second pole (18 , 142); a phase coil (14a, 14b, 14c, 84a, 84b, 84c, 106a, 106b, 106c, 112a, 116a) coupled to the first pole (16, 140) of the power supply (12, 82, 120, 136) , the phase coil (14a, 14b, 14c, 84a, 84b, 84c, 106a, 106b, 106c, 112a, 116a) configured to receive electrical energy from the power source (12, 82, 120, 136) to form a magnetic field for imparting motion to a rotor (62); a switch (20a, 20b, 20c, 86a, 122a) that couples the phase coil (14a, 14b, 14c, 84a, 84b, 84c, 106a, 106b, 106c, 112a, 116a) to the second pole (18, 142) from the power supply (12, 82, 120, 136); characterized in that the drive circuit (10, 80, 104, 110, 134) further includes a battery (24, 90, 114, 118, 150, 152, 154) having a first pole (26, 92, 125, 126) and a second pole (28, 94, 127, 128), the first pole (26, 92, 125, 126) of the battery (24, 90, 114, 118, 150, 152, 154) configured to receive energy from the field phase coil (14a, 14b, 14c, 84a, 84b, 84c, 106a, 106b, 106c, 112a, 116a), with the second pole (28, 94, 127, 128) of the battery (24, 90 , 114,118,150, 152, 154) coupled to the first pole (16, 140) of the power supply (12, 82, 120, 136) and having a polarity that is opposite to a polarity of the first pole (16, 140) of the power supply and wherein a voltage of the battery (24, 90, 114, 118, 150, 152, 154) is equal to or less than a voltage of the power supply (12, 82, 120, 136).