Hdd spindle motor pdf

Axial flux permanent magnet brushless machines 253 coil shapes, 10, 153 rhomboidal, 10, 36, 37, 267 toroidal, 10, 35 trapezoidal, 10, 3537, 141, 162, 197 computer hard disc drive hdd, 154, 306 hdd spindle motor, 307. The spindle holds these platters in a fixed position with enough space for the readwrite arms to get to the data on the disks. On the other hand, the motors of the hard disks called spindle motors must be able to generate enough torque so the magnetic platters could rotate at the desired speed. If the hard drive is not spinning up properly, do not keep trying to use it. Yaskawa provides the high reliability and performance your machine tool applications demand with a complete line of motor products to operate all machine tool spindles.

The stator core is formed by laminated steel sheets. Changes are periodically made to the information herein which will be incorporated in revised editions of the publication. Mar 07, 2006 i m need to use hard disk spindle motor for my proj bcos it gives constant high rpm like 5400 or 7200rpm. An approach to improvement of hdd spindle motor efficiency. Request pdf torque performance analysis of hdd spindle motors based on geometrical interpretation by visualizing the torque as an area enclosed by. Spindle motor definition by the linux information project linfo.

Running a hard drive motor with an rc speed controller. Many hard drive failures occur due to spindle motor not functioning properly. You can get information about the stepper motor and running machanism in. Youre in luck, i worked on hard drive spindle motor engineering for 5 years. Another fan made with hdd dc brushless motor 1080p duration.

With a traditional hard drive, there is the need to have multiple platters. Rather than attempting to revive the motor yourself, you should contact a professional data recovery company. Computerized numerical controller spindle motors mitsubishi. An hdd with disks and motor hub removed, exposing coppercolored stator coils surrounding a bearing in the center of the spindle motor. Hard disk drive spindle motors are outer rotor type pm bldc motor and normally driven by the voltage source inverter. Hard disk drive hdd spindle motors are what cause the disks in hdds to rotate. Pdf design of brushless dc spindle motors for high speed hdd.

A tutorial on control design of hard disk drive selfservo. Consumer electronics m units annual hdd shipments pc era 3. This series of drives consists of the following models. A bipolarstarting and unipolarrunning method to drive a hard disk. Its also possible to use the driver chips from the original hard disk pcb to get an idea of the sort of chips used, this site has a listing of various driver chips with links to datasheets, but they are usually much more complicated since they often combine both the spindle motor driver and the voice coil driver readwrite head into one package. In this paper we discuss the trends of hdd, requirements for hdd spindle motors, motor construction, problems in relation to magnetic circuits, and constituent fdb technologies view show abstract. Strictly speaking, drive refers to the motorized mechanical aspect that is distinct from its medium, such as a tape drive and its tape, or a floppy disk drive and its floppy disk. Its not flashy, but it must provide stable, reliable and consistent turning power for thousands of hours of often continuous use to allow the hard disk to function properly. Us200806285a1 spindle motor, disk drive, and method of. In fact, evercom is the only company outside japan who can design and manufacture hdd spindle motors. Spindle motor plays an important role in hard drive operation by turning the hard disk platters. The salient poles made of the steel sheets are formed by etching. The motor maximum speed is 4500 rpm 75 rotationsecond and the maximum power is reached during the seeki n g phase is about 6.

Optimum design of oil lubricated thrust bearing for hard disk. In yesteryear, while i was doing a science fair project that exploited a hard disc drive spindle motor, i came across dozens of hard disc drive spindle motors in my junk box and eventually settled on a pretty cool one i lifted earlier from a samsung 3. Hard disk drive servo systems since the commercial usage of magnetic disk drives began in 1956 1, the hard disk drive hdd has been playing an important role in the modern era of digital technology. This chapter provides an overview of the contents of this manual, including the intended user, manual organization, terminology and conventions. The hard drive spindle motor is threephased which provides stability of magnetic disks rotation mounted on an axis spindle of the engine. A hard disk drive is a nonvolatile storag e device that stores digitally encoded data on rotati ng rigid platters with magnetic surfaces. Hard disk drive hdd designs have continued to evolve over time to meet the everchanging requirements of applications, performance, and cost. This paper presents the application of optimization method developed by hashimoto to design oil lubricated thrust bearings for 2. First of all, note that a common hard disc drive hdd spindle motor is in fact a sensorless threephase brushless. Hard disk drive is a compact mechatronic component and there is no lot available space for placing its motor. This advantage makes it a candidate among the design options for hdd spindles. The designing involves optimization of groove geometry and dimensions. The sigma sd line of spindle drive systems brings a notable increase in precision and productivity to automated machining equipment. Hard drive spindle motor is a brushless motor with wye wiring with 4 connectors.

Diax04 hdd and hds drive controllers 2nd generation. In this projet i reuse a bldc motor that i retrieved from an old hdd, the seagate st31722a. Some computer enthusiasts believe that freezing or even heating a drive will help to revive it, however this is a high risk move. Jun 06, 2009 initial attempt at bldc motor control fail. Direct drive motor specifications and instruction manual. Si9993cs vishay siliconix faxback 4089705600, request 70653 s60752rev. Drag torque measurement of hard disk drive spindle motors. Failure to follow these precautions and guidelines outlined here may lead to product failure, damage and invalidation of all warranties. However, youre not in luck, because driving that motor isnt going to be as easy as you hoped.

The stator of the engine has three windings included by a star with the tap in the middle, and a rotor contains a permanent section magnet. Torque performance analysis of hdd spindle motors based on. Oct 17, 2017 in the case of a hard drive, the spindle shown below is what holds the hard drives platters in place. Hdds spindle replacement tool is used to replace jammed spindle and solve the stuck motor problem on following hard drives. Pdf this paper focuses on the design issues for brushless dc motors used in hard disk drives. Accordingly, these motors must offer superior performance in terms of rotational speed and low nonrepeatable run out nrro. The linear servo motor, directdrive motor and builtin ipm spindle motor uses permanent magnets in the rotor, so observe the following precautions.

Brushless motor driver for disk drive motors imajeenyus. Brushless dc motor drive circuit tda5144 features fullwave commutation using pushpull drivers at the output stages without position sensors builtin startup circuitry three pushpull outputs. We offer a comprehensive line of factory automation solutions. The stator has a stator core comprising a yoke and salient poles and also includes a stator coil. Calculations are carried out to maximize the dynamic stiffness of the thrust bearing spindle motor. The spindle motor is sort of a work horse of the hard disk, like a heart of human, it give the motivity of power to the hdd. The precision of these motors determine the capacity and speed of hdds, making these components critical to hdd performance. Spindle motor vmag pgadj 3 vco vco adjust vco phase and frequency so ia, ib, and ic change polarity in the center of a pllstate pllstate 3 a sin 60 fvco t 120 a sin 60 fvco t 240 a sin 60 fvco t va vb vc modulation frequency pwm modulator pwm modulator pwm modulator upa upb upc driver driver driver ia phb phc pha phb phc ct ib ic pha. Instead of transplanting the platters to a new hard drive, only the bearing is replaced on a patient hard drive. Hard drive for low power energy efficiency in disk storage.

Electromagnetic design for hard disk drive spindle motors. Hello all, here i have tried to run the hard disk with ic 555 and ic 4017 and motor controller ic l293d the idea is simple, hard disk motor requires 3 shifted pulses to run. Maxtor may make changes or improvements in the products described in this. The orange stripe along the side of the arm is a thin printedcircuit cable, the spindle bearing is in the center and the actuator is in the upper left. Find the common, then attach the other three to the speed. For the love of physics walter lewin may 16, 2011 duration. About kickoff with hdd spindle motors evercom micro motors, was founded in 1988 at sciencebased industrial park, hsinchu, taiwan to produce spindle motor for hdd harddisk drive. Air bearing spindle motor for hard disk drives request pdf. A platter is a thin, highprecision aluminum or glass disk that is coated on both sides with a high precision magnetic material and which is used in a hdd to. Solutions include robots, automation platforms, sequence controllers, humanmachine interfaces, variable frequency drives, servo amplifiers and motors, motion controllers, computer numerical control, pcbased cnc, linear servos, and industrial sewing machines, for a broad range of factory automation applications. Spindle motor, six main reasons why spindle motor does not get started. A hard disk drive often shortened as hard disk, hard drive, or hdd is a nonvolatile storage device that stores digitally encoded data on rapidly rotating rigid i. A spindle motor must provide stable, reliable, and consistent turning power for many hours of continuous use. Request pdf an approach to improvement of hdd spindle motor efficiency to improve the efficiency of hdd spindle motor, reducing air gap length agl and raising magnetic energy product mep.