Shunt wound DC motor driving device and electrical equipment

A shunt wound DC motor driving device, characterized by comprising:

• a shunt wound DC motor having a rated voltage;
• a DC power supply having a constant voltage that corresponds to the rated voltage;
• and
• a chopper that converts the constant voltage into a variable voltage based on a control signal and provides the variable voltage for the shunt wound DC motor,
• wherein the chopper is provided with m chopping units;
• each of the chopping units is provided with a first power output end, a second power output end and w switching control ends;
• the control signal comprises m unit control signals that respectively correspond to the m chopping units and are formed according to a preset phase stagger rule;
• each of the unit control signals comprises w switching control signals that correspond to the w switching control ends in the corresponding chopping units;
• the w switching control ends are used for correspondingly receiving the w switching control signals;
• m first power output ends of all the chopping units and m second power output ends of all the chopping units respectively correspondingly form m pairs of power output terminals;
• the shunt wound DC motor comprises:
• a casing;
• m pairs of electric brushes fixed in the casing;
• a stator, arranged in the casing and comprising m pairs of main poles corresponding to the m pairs of electric brushes and further comprising an exciting winding part;
• and
• a rotor that is arranged in the stator and comprises a plurality of armature windings connected in a one-to-one correspondence manner in a preset connection manner;
• each pair of the main poles comprises an S-polarity main pole and an N-polarity main pole;
• two adjacent main poles have different polarities;
• two electric brushes in each pair of electric brushes have adjacent positions;
• each pair of the electric brushes comprises an S-pole corresponding electric brush that corresponds to the S-polarity main pole and an N-pole corresponding electric brush that corresponds to the N-polarity main pole;
• the exciting winding part comprises m exciting winding units;
• each of the exciting winding units is formed by respectively making exciting coils from insulated conductor strips composed of metal wires coated with insulating layers on at least one pair of main poles;
• the insulated conductor strip in each of the exciting winding units is provided with one end and the other end;
• the m ends of all the insulated conductor strips are electrically connected with m S-pole corresponding electric brushes in all the electric brushes to form m first wiring terminals;
• meanwhile, the m other ends of all the insulated conductor strips are electrically connected with m N-pole corresponding electric brushes in all the electric brushes to form m second wiring terminals;
• or the m ends of all the insulated conductor strips are electrically connected with m N-pole corresponding electric brushes in all the electric brushes to form m first wiring terminals;
• meanwhile, the m other ends of all the insulated conductor strips are electrically connected with m S-pole corresponding electric brushes in all the electric brushes to form m second wiring terminals;
• the m first wiring terminals and the m second wiring terminals respectively correspondingly form m pairs of external wiring terminals;
• the m pair of external wiring terminals are connected with the m pairs of power output terminals in a one-to-one correspondence manner;
• m is a positive integer of being not less than 2;
• and w is 1, 2 or 4.