Pot magnet for a plunger coil arrangement

A pot magnet for a plunger coil arrangement, the pot magnet including:

• (a) a housing having a housing interior defined by a housing bottom surface and a housing interior peripheral surface extending perpendicular to the housing bottom surface;
• (b) a permanent magnet unit arranged in the housing interior, the permanent magnet unit including a permanent magnet and a pole plate;
• (c) wherein the permanent magnet unit is located in the housing interior such that an annular plunger coil receiving gap is formed between a circumferential surface of the pole plate and the housing interior peripheral surface;
• (d) wherein the permanent magnet is bonded to the housing bottom surface with an underside of the permanent magnet facing the housing bottom surface and with an adhesive material layer with a thickness dK formed between the housing bottom surface and the underside of the permanent magnet;
• (e) wherein the pole plate is connected to the housing by a rigid fastening device which positions the pole plate such that a lower side of the pole plate faces an upper side of the permanent magnet and a pole plate gap of width d is formed between the lower side of the pole plate and the upper side of the permanent magnet;
• and
• (f) wherein the rigid fastening device includes a support element that extends through an opening in the permanent magnet without interfering contact between the support element and the permanent magnet.