| 摘要 |
An elevator system includes a roller ( 16 ) having a hardness that varies responsive to a magnetic field ( 20 ). The roller ( 16 ) rolls along a guide rail ( 28 ) to maintain a desired orientation of the elevator car ( 12 ). In one example, the roller ( 16 ) includes a membrane ( 30 ) defining a generally annular chamber ( 36 ) containing fluid ( 22 ) that changes viscosity responsive to changes in the magnetic field ( 20 ). The rollers ( 16 ) are associated with at least one magnetic field generator ( 18 ) that generates a magnetic field ( 20 ) of a selected strength. Varying the magnetic field varies the hardness of each roller ( 16 ) to control vibrations of the elevator car ( 12 ) to improve ride quality.
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