Bearing test method, bearing test device, bearing monitoring device and storage device
First Claim
1. A bearing test method to test, in a bearing that can retain a shaft element and a bearing element coaxially positioned in a non-contact state when the number of revolutions exceeds a predetermined number of relative revolutions, whether the shaft element and the bearing element are in a contact rotation state, the method comprising the steps of:
- relatively rotating the shaft element and the bearing element;
detecting a change in impedance between the shaft element and the bearing element in the relative rotation state, determining, based on the change in impedance, whether the shaft element and the bearing element are in a contact rotation state.
2 Assignments
0 Petitions
Accused Products
Abstract
A bearing test method and a bearing test device are provided for bearings in which a non-contact state is maintained between a shaft element and a bearing element in a normal rotation state. In addition, a motor bearing monitoring device is provided to detect an abnormality in a motor or that a motor'"'"'s life is near its end, where the motor utilizes the bearing. Furthermore, a storage device such as a hard disk drive equipped with the motor monitoring device is provided. For a bearing that can retain a shaft element and a bearing element coaxially positioned in a non-contact state when the number of revolutions exceeds a predetermined number of relative revolutions, a bearing test method is provided to determine whether the shaft element and the bearing element are in a contact rotation state. The bearing test method includes at least the steps of rotating the shaft element and the bearing element relatively with one another and detecting impedance between the shaft element and the bearing element in the relative rotation state. A determination is made based on a change in impedance as to whether the shaft element and the bearing element are in a contact rotation state.
25 Citations
81 Claims
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1. A bearing test method to test, in a bearing that can retain a shaft element and a bearing element coaxially positioned in a non-contact state when the number of revolutions exceeds a predetermined number of relative revolutions, whether the shaft element and the bearing element are in a contact rotation state, the method comprising the steps of:
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relatively rotating the shaft element and the bearing element;
detecting a change in impedance between the shaft element and the bearing element in the relative rotation state, determining, based on the change in impedance, whether the shaft element and the bearing element are in a contact rotation state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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12. A bearing test device for testing a bearing that can retain a shaft element and a bearing element coaxially positioned in a non-contact state when the number of revolutions exceeds a predetermined number of relative revolutions, whether the shaft element and the bearing element are in a contact rotation state, the bearing test device comprising:
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an impedance detection circuit that detects impedance that changes with the contact or non-contact state between the shaft element and the bearing element in a relative rotation state, wherein the impedance detection circuit is equipped with a voltage application device that applies voltage to one of the shaft element and the bearing element, and an output voltage detection device that detects output voltage from the other, and a determination is made based on a change in the output voltage as to whether the shaft element and the bearing element are in a contact rotation state.
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28. A motor bearing monitoring device comprising:
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a status detection device that detects the state of a motor bearing;
an abnormality determination device that makes a determination whether the bearing is in an abnormal state based on the state of the bearing as detected by the status detection device; and
an output device that outputs a result of the determination from the abnormality determination device.
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54. A memory device having a disk-shaped memory media, a disk driving motor that rotationally drives the memory media, and a head device that performs at least one of two operations that are recording information on or retrieving information from the memory media, the memory device comprising:
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a status detection device that detects the status of a bearing of the disk driving motor;
an abnormality determination device that makes a determination as to whether the bearing is in an abnormal state based on the state of the bearing as detected by the status detection device; and
an output device that outputs a result of the determination from the abnormality determination device. - View Dependent Claims (55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81)
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Specification