# US 10,374,475 B2 · Reduced reel motor disturbances in a tape drive system

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- Number: US 10,374,475 B2
- Document ID: US10374475B2
- Status: Granted
- Kind: B2
- Application number: 15/215,501
- Filed: 2016-07-20
- Published: 2016-11-10
- Granted: 2019-08-06
- Earliest claimed: 2014-04-11
- Assignees: International Business Machines Corporation
- Applicants: International Business Machines Corporation
- Inventors: David H. F. Harper; Hugo E. Rothuizen
- Web page: https://patentgrep.com/patent/US10374475B2

## CPC

- H02K 1/30: using intermediate parts, e.g. spiders
- G11B 5/00813: {magnetic tapes}
- G11B 15/18: Driving; Starting; Stopping; Arrangements for control or regulation thereof {(G11B15/56 takes precedence)}
- G11B 15/26: Driving record carriers by members acting directly or indirectly thereon {(G11B15/44 takes precedence; driving features inside container, see G11B23/04 and subgroups)}
- H02K 1/2733: Annular magnets
- H02K 3/20: for auxiliary purposes, e.g. damping or commutating
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

An apparatus according to one embodiment includes a motor having: a rotor, a magnet, and a damping layer positioned between the rotor and the magnet. The damping layer is constructed of a material characterized by converting kinetic energy into heat.

## Claims

### Claim 1

An apparatus, comprising:
a motor having:
a rotor;
a magnet; and
a damping layer positioned between the rotor and the magnet;
wherein the damping layer is constructed of a material characterized by converting kinetic energy into heat.

### Claim 2 (depends on 1)

The apparatus of claim 1, further comprising a pole piece.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the magnet, the pole piece, and the damping layer are concentric rings.

### Claim 4 (depends on 2)

The apparatus of claim 2, wherein the damping layer is positioned between the first end of the magnet and the rotor.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the rotor has a cup shape, having a sidewall extending away from a flange and along an outer circumference of the magnet.

### Claim 6 (depends on 2)

The apparatus of claim 2, wherein the pole piece is detachably coupled to the rotor.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the damping layer is detachably coupled to the rotor.

### Claim 8 (depends on 5)

The apparatus of claim 5, further comprising a pole piece between the magnet and the sidewall of the rotor, wherein the damping layer is positioned between the pole piece and the sidewall of the rotor.

### Claim 9 (depends on 1)

The apparatus of claim 1, further comprising:
a magnetic head;
a guide for guiding a magnetic medium over a magnetic head; and
a controller electrically coupled to the magnetic head.

### Claim 10

A tape drive system, comprising:
a magnetic head; and
a drive mechanism for passing a magnetic medium over the magnetic head, the drive mechanism including a motor having:
a rotor;
a magnet; and
a separate damping layer positioned between the rotor and the magnet;
wherein the damping layer is constructed of a material characterized by converting kinetic energy into heat.

### Claim 11 (depends on 10)

The tape drive system of claim 10, further comprising a pole piece.

### Claim 12 (depends on 11)

The tape drive system of claim 11, wherein the pole piece is detachably coupled to the rotor.

### Claim 13 (depends on 11)

The tape drive system of claim 11, wherein the damping layer is positioned between the pole piece and the rotor.

### Claim 14 (depends on 10)

The tape drive system of claim 10, wherein the rotor has a cup shape, having a sidewall extending away from a flange and along an outer circumference of the magnet.

### Claim 15 (depends on 14)

The tape drive system of claim 14, wherein the sidewall acts as a pole piece.

### Claim 16 (depends on 15)

The tape drive system of claim 15, wherein the damping layer is positioned between the magnet and the sidewall of the rotor, wherein the damping layer is detachably coupled to the rotor.

### Claim 17 (depends on 10)

The tape drive system of claim 10, further comprising:
a controller electrically coupled to the magnetic head.