1. A probe pin comprising:
a conductive housing having a first end and a second end opposite the first end, and a space extending from the first end to the second end being formed internally;
a first conductive plunger provided at the first end;
a second conductive plunger provided at the second end; and
a coil spring received in the housing to elastically support at least one of first and second plungers;
wherein the coil spring comprises a first coil portion having coils, each with a substantially equal diameter, and a second coil portion adjacent to one end of the first coil portion and having coils with gradually reduced diameters relative to the diameter of the first coil portion,
wherein the second coil portion extends diagonally from the first coil portion,
wherein an end of the second coil portion is connected to the first plunger or the second plunger,
wherein the coil spring comprises a third coil portion adjacent to an other end of the first coil portion and having coils with gradually reduced diameters relative to the diameter of the first coil portion,
wherein the third coil portion extends diagonally from the first coil portion, and
wherein an end of the third coil portion is connected to the second plunger or the first plunger.
2. The probe pin according to claim 1, wherein a diameter dl of a final end of the second coil portion is smaller than a diameter d of the first coil portion and wherein a diameter d2 of a final end of the third coil portion is smaller than the diameter d of the first coil portion.
3. The probe pin according to claim 2, wherein the diameter dl of the final end of the second coil portion is equal with the diameter d2 of the final end of the third coil portion
4. The probe pin according to claim 1, wherein a central axis of the second coil portion crosses a central axis of the first coil portion.
5. The probe pin according to claim 1, wherein a central axis of the third coil portion crosses a central axis of the first coil portion.
6. The probe pin according to claim 1, wherein the second and third coil portions are extended to the same side relative to a central axis of the first coil portion.
7. The probe pin according to claim 1, wherein the second and third coil portions are extended to opposite sides relative to a central axis of the first coil portion.
8. The probe pin according to claim 1, wherein a first angle formed by central axes of the first and second coil portions equals a second angle formed by central axes of the first and third coil portions.
9. The probe pin according to claim 1, wherein the coil spring is symmetric with respect to a centerline orthogonal to a central axis of the first coil portion.
10. The probe pin according to claim 1, wherein the coil spring is rotationally symmetric with respect to a center of a central axis of the first coil portion.
11. The probe pin according to claim 1, wherein the first plunger comprises a cylindrical first contact portion and a cylindrical first sliding portion having the same axis as that of the first contact portion, the first sliding portion formed with a conical first abutting portion, the first abutting portion connected to the end of the second coil portion.
12. The probe pin according to claim 1, wherein the second plunger comprises a cylindrical second contact portion and a cylindrical second sliding portion having a same axis as that of the second contact portion, the second sliding portion formed with a conical second abutting portion, the second abutting portion connected to the end of the second coil portion.
13. A socket having a plurality of probe pins, each probe pin comprising:
a conductive housing having a first end and a second end opposite the first end, and a space extending from the first end to the second end being formed internally;
a first conductive plunger provided at the first end;
a second conductive plunger provided at the second end; and
a coil spring received in the housing to elastically support at least one of first and second plungers;
wherein the coil spring comprises a first coil portion having coils, each with a substantially equal diameter, and a second coil portion adjacent to one end of the first coil portion and having coils with gradually reduced diameters relative to the diameter of the first coil portion,
wherein the second coil portion extends diagonally from the first coil portion, and
wherein an end of the second coil portion is connected to the first plunger or the second plunger,
wherein the coil spring comprises a third coil portion adjacent to an other end of the first coil portion and having coils with gradually reduced diameters relative to the diameter of the first coil portion,
wherein the third coil portion extends diagonally from the first coil portion, and
wherein an end of the third coil portion is connected to the second plunger or the first plunger.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An electric drive system for a household appliance, the electric drive system comprising:
an electric motor; and
a passive power factor correction coil, wherein
the passive power factor correction coil is mechanically coupled to an end shield of the electric motor or the passive power factor correction coil is arranged inside a housing of the electric motor.
2. The electric drive system according to claim 1, wherein:
the electric motor comprises a 3 phase electric motor.
3. The electric drive system according to claim 1, wherein:
the electric drive system comprises a frequency converter, wherein the frequency converter is adapted to control the electric motor.
4. The electric drive system according to claim 3, wherein:
the frequency converter is electrically connected to the electric motor and to the passive power factor correction coil by means of a connector assembly.
5. The electric drive system according to claim 3, wherein:
the frequency converter and the passive power factor correction coil are arranged inside the housing of the electric motor.
6. The electric drive system according to claim 1, wherein:
the passive power factor correction coil comprises a U, E, or EI core shape coil design.
7. The electric drive system according to claim 1, wherein:
the passive power factor correction coil comprises a ring core shape coil design.
8. The electric drive system according to claim 1, wherein:
the passive power factor correction coil is mechanically coupled to the end shield of the electric motor by means of coil brackets.
9. A household appliance comprising:
a drivable, or rotatable, functional unit; and
an electric drive system according to claim 1 being adapted to drive the functional unit.
10. The household appliance according to claim 9, wherein:
the functional unit comprises a washing machine drum.
11. The household appliance according to claim 9, wherein:
the functional unit comprises a dryer drum.
12. The household appliance according to claim 9, wherein:
the functional unit comprises a fan.
13. The household appliance according to claim 9, wherein:
the functional unit comprises a pump.