An electric drive apparatus , provided in an electric device to drive the electric device, and comprising: a DC motor , for driving the electric device; a DC power source , for outputting constant-voltage DC power to the DC motor ; and a chopper , for converting the constant-voltage DC power into variable-voltage DC power according to a driving signal and providing the variable-voltage DC power to the DC motor ; characterized in that : wherein, the DC motor has 2j armature winding branches each consisting of m windings , 2j ×m commutator segments connected to the windings , and two brush sets respectively connected to two power line sets of the DC motor and in contact with the commutator segments; each of the brush sets comprises j brushes ; each of the power line sets comprises j power lines; the chopper has k bridge arm portions , and each of the bridge arm portions comprises j bridge arm units connected to j power lines of one power line set in one-to-one correspondence, and each of the bridge arm units provides a current for two armature winding branches through correspondingly connected power lines; the armature winding branches generate an output torque to drive the electric device; and both j and m are positive integers not less than 2, and k is 1 or 2. a DC motor , for driving the electric device; a DC power source , for outputting constant-voltage DC power to the DC motor ; and a chopper , for converting the constant-voltage DC power into variable-voltage DC power according to a driving signal and providing the variable-voltage DC power to the DC motor ; characterized in that : wherein, the DC motor has 2j armature winding branches each consisting of m windings , 2j ×m commutator segments connected to the windings , and two brush sets respectively connected to two power line sets of the DC motor and in contact with the commutator segments; each of the brush sets comprises j brushes ; each of the power line sets comprises j power lines; the chopper has k bridge arm portions , and each of the bridge arm portions comprises j bridge arm units connected to j power lines of one power line set in one-to-one correspondence, and each of the bridge arm units provides a current for two armature winding branches through correspondingly connected power lines; the armature winding branches generate an output torque to drive the electric device; and both j and m are positive integers not less than 2, and k is 1 or 2. wherein, the DC motor has 2j armature winding branches each consisting of m windings , 2j ×m commutator segments connected to the windings , and two brush sets respectively connected to two power line sets of the DC motor and in contact with the commutator segments; each of the brush sets comprises j brushes ; each of the power line sets comprises j power lines; the chopper has k bridge arm portions , and each of the bridge arm portions comprises j bridge arm units connected to j power lines of one power line set in one-to-one correspondence, and each of the bridge arm units provides a current for two armature winding branches through correspondingly connected power lines; the armature winding branches generate an output torque to drive the electric device; and both j and m are positive integers not less than 2, and k is 1 or 2. <EOS>