Hard Drive Brushless Motors

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• Integrated Drive Electronics for Brushless DC Motors
  . factors influencing brushless motor performance, BLDCs can achieve rapid acceleration and high speed,. generate less audible noise and less electromagnetic interference, and promote long life with low. maintenance. These features make BLDCs ideal to drive devices such as computer hard/floppy disks...
• Sensorless Brushless DC Motor Reference Design
  by electronics. Brushless dc motors offer longer life and less maintenance than conventional brushed dc motors. AN208Rev0_2.fm AN208. SENSORLESS BRUSHLESS DC MOTOR REFERENCE DESIGN. 1. Introduction. This reference design provides a hardware and Most computer hard disc drives use a sensorless...
• Brushless DC Motor Control Made Easy
  This application note discusses the steps of developing several controllers for brushless motors. We cover sensored, sensorless, open loop, and closed loop design. There is even a controller with independent voltage and speed controls so you can discover your motor's characteristic's empirically...
• Determining MOSFET Driver Needs for Motor Drive Applications
  driver is normally in the form of a power transistor. This can be a bipolar transistor, MOSFET or an Insulated Gate Bipolar Transistor (IGBT). In some small Brushless DC motor or stepper motor applications, the MOSFET driver can be used to directly drive the motor. For this application note, though...
• Dc motor impersonators
  brushed, brushless, wound-field, and permanent-magnet varieties. They are widely used simply because it's easier to regulate the operation of dc motors than that of ac motors. This is especially true if the application demands tight control of motor torque, velocity, or position. Within specific...
• Switches put a new spin on motors
  , improvements in motor and drive designs have generally been incremental. That has changed with recent development by DynaMotors Inc., Cleveland, of a totally integrated motor/drive that provides adjustable speed and high torque over a wide speed range even from a single-phase source. It is brushless...
• Snake-oil specs spell trouble for motor sizing
  accurate values for electrical and mechanical time constants, peak power, peak torque, and motor constants. This Servostar drive, for example, controls brushless motors, direct-drive motors, and servomotors using parameters derived from tests routinely performed to set up drives for robust motion...
• Application Note: Controlling Motor Runaway (April 2002)
  - Phase Problems in Electronically Commutated Systems. Electronically Commutated motor, like Brushless Servos and AC Vectors, have vulnerabilities due to their commutation algorithms. Simply put, the commutation algorithm is out of sync with the torque command of the motor. This commutation angle error...
• Sensorless BLDC Control with Back-EMF Filtering
  in the 40k to 100k electrical RPM range. Some BLDC motor applications that run in this RPM range are model RC motors, fans, hard drives, air pumps and dental drills. AN1083, Sensorless BLDC Control with Back-EMF Filtering AN1083. Sensorless BLDC Control With Back-EMF Filtering...
• Choose wisely
  of feedback depends largely on the type of servomotor and amplifier. Brushless servomotors must sense rotor position to control the points at which the drive electronically switches current through the windings in a process called electronic commutation. Often the same position feedback device...

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