High frequency leakage current return wire-contained motor drive cable, low inductance return wire-contained unshielded cable, and motor drive control system using the cables

A high frequency (HF) leakage current return wire-contained motor drive cable comprising:

• a plurality of drive insulated wires;
• a ground wire;
• at least one HF leakage current return wire, the plurality of drive insulated wires and the at least one HF leakage current return wire being arranged adjacent to and in close contact to thereby reduce inductances of the at least one HF leakage current return wire, and the drive insulated wires, the at least one HF leakage current return wire, and the ground wire being arranged substantially parallel to a longitudinal direction and being stranded;
• and
• a sheath provided on the outer circumference of the stranded wires without a shield being provided outside of the strand wires.

A high frequency (HF) leakage current return wire-contained motor drive cable comprising:

• a plurality of drive insulated wires;
• at least one HF leakage current return wire, the plurality of drive insulated wires and the at least one HF leakage current return wire being arranged adjacent to and in close contact to thereby reduce inductances of the at least one HF leakage current return wire and substantially parallel to a longitudinal direction and are stranded;
• a shield provided outside of the strand wires;
• and
• a sheath provided outside of the shield.

A high frequency (HF) leakage current return wire-contained motor drive cable comprising:

• a plurality of drive insulated wires;
• a ground wire;
• at least one HF leakage current return wire, the plurality of drive insulated wires and the at least one HF leakage current return wire being arranged adjacent to and in close contact to thereby reduce inductances of the at least one HF leakage current return wire, and the drive insulated wires, the at least one HF leakage current return wire, and the ground wire being arranged substantially parallel to a longitudinal direction and being stranded;
• a shield provided outside of the strand wires;
• and
• a sheath provided outside of the shield.

A low inductance return wire-contained unshielded cable comprising, as viewed from a cable cross-sectional direction:

• three insulated wires respectively arranged independently at three apexes of a substantially equilateral triangle;
• three return wires respectively arranged in external portions of valley portions of an assembly formed from the three insulated wires at three apexes of a substantially equilateral triangle to be adjacent to and in close contact with the insulated wires, thereby to reduce inductances of loop circuits configured from the respective insulated wires and return wires, the three insulated wires and the three return wires being arranged substantially parallel to a longitudinal direction and stranded along the same direction;
• and
• a sheath being provided on the outer circumference of the stranded wires without a shield being provided outside of the strand wires.

A low inductance return wire-contained unshielded cable comprising:

• three insulated wires;
• one ground wire;
• one or more return wires arranged adjacent to and in close contact with an outer circumference of any one of the three insulated wires to thereby reduce inductances of loop circuit configured from the insulated wires and the return wires, the three drive insulated wires, the one or more of return wires, and the one ground wire being arranged substantially parallel to a longitudinal direction and being stranded;
• and
• a sheath provided on the outer circumference of the stranded wires without a shield being provided outside of the strand wires.

A high frequency (HF) leakage current return wire-contained drive cable for interconnecting an inverter and a driven control device comprising:

• a plurality of drive insulated wires;
• one or more HF leakage current return wires not each jacketed with an insulative sheath, the plurality of drive insulated wires and the one or more HF leakage current return wire being adjacently arranged substantially parallel to a longitudinal direction and being stranded;
• and
• a sheath provided on the outer circumference of the stranded wires without a shield being provided outside of the strand wires,
• wherein the inverter and the driven control device are interconnected by the drive cable to thereby reduce inductances of loop circuits configured from the respective insulated wires and return wires, thereby to form the HF leakage current return wire as a return path of the HF leakage current from the driven control device to the inverter.

A high frequency (HF) leakage current return wire-contained motor drive cable for interconnecting an inverter and a driven control device comprising, as viewed from a cable cross-sectional direction:

• three insulated wires respectively arranged independently at three apexes of a substantially equilateral triangle;
• three HF leakage current return wires respectively arranged at three apexes of a substantially equilateral triangle, the three HF leakage current return wires arranged to be adjacent to and in close contact with the insulated wires, and the wires thus arranged are stranded;
• and
• a sheath provided on the outer circumference of the stranded wires without a shield being provided outside of the strand wires,
• wherein the inverter and the driven control device are interconnected by the drive cable to thereby reduce inductances of loop circuits configured from the respective insulated wires and return wires, thereby to form the HF leakage current return wires as return paths of the HF leakage current from the driven control device to the inverter.