Electric drive apparatus, chopper, dc motor, and electric device

A chopper, respectively connected to a DC motor (driving an electric device and comprising 2j armature winding branches, 2j×m commutator segments, 2j brushes, and 2j power lines), and to a DC power source (outputting constant-voltage DC power to the DC motor);

• used 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 it comprises:
• k bridge arm portions,
• wherein, each of the bridge arm portions comprises bridge arm units connected to j power lines of one power line set in one-to-one correspondence;
• each of bridge arm units outputs current for two armature winding branches through correspondingly connected power lines, and 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, connected with the chopper, wherein, the chopper has k bridge arm portions, each bridge arm portion comprises j bridge arm units, and each bridge arm unit outputs current;

• characterized in that it comprises:
• 2j armature winding branches, each composed of m windings connected in series, for generating an output torque to drive the electric device;
• a main pole, providing a working magnetic field for the armature winding branches;
• a commutator, comprising 2j×m commutator segments respectively connected to the windings;
• 2j brushes, evenly arranged on the commutator, corresponding to the main pole, each coming in contact with at least one commutator segment, and each connected to one power line;
• and
• 2j power lines, with one end connected to the bridge arm unit and the other end connected to one brush, providing current for two armature winding branches;
• wherein, both j and m are positive integers not less than 2, and k is 1 or 2.