| 摘要 |
An electrically operable magnetic rail brake device (1) for magnetically cooperating with a rail of magnetisable material in a braking state and comprising: a magnetic circuit of soft-magnetic material (5), coil means (7) of electrically conducting material for generating an electromagnetic field when an electric current flows through the coil means (7), switchable magnetisable core means (9) belonging to the magnetic circuit and located within the coil means, a working area (11) to be directed to a rail, where in the braking state as a result of the coil means being passed through by an electric current a magnetic brake field is switched on which extends beyond the working area and can be closed via the rail. <??>The switchable core means (9) are made of hard-magnetic material. As a result of at least an electrical magnetizing pulse of suitable duration and strength flowing through the coil means (7), the switchable core means (9) can be magnetized permanently up to a permanent magnetizing state. The magnetic brake field comprises a permanent magnetic brake field that is produced by the switchable core means (9) in the permanent magnetizing state. The rail brake device (1) can advantageously also contain lasting permanent magnetic material. <??>The invention also relates to an arrangement that is movable along one or more rails, such as a rail carriage, a lift, a hoisting device etc. provided with an electrically operable rail brake device according to the invention.
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