ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Brushless DC MotorOutlineReference listTo explore further…Major applicationsMajor applicationsBasic working principle illustratedSlide 8Slide 9Slide 10Slide 11Slide 12A typical sample configuration in applicationA typical sample configuration in application (Additional)A typical sample configuration in application (additional)Major specificationsSlide 17Slide 18LimitationsSelectionSlide 21Slide 22Slide 23Comparison (Reference 1)Slide 25Where to buy???ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Assignment#01: Literature Survey on Sensors and Actuators Topic: Brushless DC MotorPrepared by:Carlos DiazDept. of Electrical and Computer Engineering Utah State UniversityT: (435)797-2840; F: (435)797-3054 (ECE Dept.)http://www.engineering.usu.edu/ece/3/10/200601/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-2Outline –Reference list–To probe further–Major applications–Basic working principle illustrated–A typical sample configuration in application (application notes)–Major specifications–Limitations–And many more relevant issues in applications (such as, how to choose, cost information, where to buy etc.)01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-3Reference list1. AN885 - Brushless DC (BLDC) Motor Fundamentals - Padmaraja Yedamale.2. Brushed DC Motors – Kevin Craig. ECE 5320 Class Notes (Used by USU under author’s permission).3. Mechatronics Handbook - Robert H. Bishop. CRC Press.* Note: All internet references will be alluded within the time of their reproduction.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-4To explore further…•http://en.wikipedia.org/wiki/Brushless_DC_electric_motor•http://www.silabs.com/tgwWebApp/public/web_content/products/Microcontrollers/en/motor_bldc.htm•http://focus.ti.com/docs/apps/catalog/general/applications.jhtml?templateId=6066&path=templatedata/cm/general/data/dctrl_mocon_ovw_bldc•http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=02nQXGrrlPY7r8hv0V•http://homepages.enterprise.net/jayjay/cdrom_motors.htm•http://www.answers.com/topic/electric-motor•http://www.infolytica.com/en/coolstuff/ex0122/•http://www.ecmweb.com/mag/electric_maybe_choose_brushless/index.html•http://homepages.enterprise.net/jayjay/cdrom_motors.htm01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-5Major applications •In theory, Brushless DC Motors can potentially be used in any type of application where Brushed DC Motors are currently employed. Certain limitations (like cost primarily), however prevent them from replacing brushed motors in common areas of use.•Areas in which Brushless DC Motors currently dominate include specialized applications where higher torque, longer product life or even more precision is required, such as computer hard drives, CD/DVD players and PC cooling fans, mechanisms within office products like laser printers and photocopiers as well as industrial automation equipment.•It should be noted that because of their ease of operation, when torque / high precision is required (such as servomotor construction), Brushless DC Motors are the growing choice when designing this type of applications. And since the ratio of torque delivered to the size of the motor is higher than in other motor types, the Brushless DC Motor is very useful in applications where space and weight are critical factors.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-6Major applicationsHere are some detailed example of DC Brushless Motor applications:•Industrial automation •Fans (i.e. PC & Ceiling)•Electrical Power Steering •Electric vehicle traction drive •Office automation equipment Servo drives •HVAC systems (air handling equipment) •Refrigerator•Washing machines •Blowers01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-7Basic working principle illustrated•To understand how Brushless DC Motors operate, first it is necessary to understand the working principle of conventional (brushed DC Motors).•In these motors a voltage applied to the rotor (rotating part of the motor), generates a magnetic field that opposes that of the stator (stationary part of the motor), inducing the movement. In other words, the magnetic field induced by the polarity of the applied voltage causes the rotor to realign itself in respect to the stator magnetic field.Image Taken from: http://www.ul.ie/~gaughran/flynn/dcmotor.html01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-8Basic working principle illustrated•Brushes make mechanical contact with the commutator, and each turn assures the required change of polarity. A circuit is then created between the power supply and the contacts on the rotor, by means of the stator coil windings.•As each side of the commutator (shaped as a two sided ring) turns, the brushes change the applied polarity, inverting the magnetic field. This is due to the fact that when the coil is perpendicular to the magnetic field, the current must be reversed in direction for the torque to remain in the same direction.•It should be noted, that DC Motors operate under the principle that current-carrying conductors placed in a magnetic field, experience mechanical forces with their direction determined by Fleming's Left-hand rule. Images: http://www.ul.ie/~gaughran/flynn/dcmotor.html01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-9Basic working principle illustrated•The brushless motor system consists of a wound stator, a permanent magnet rotor, a rotor position sensor, and a solid state switching assembly. (2) •On the Brushless DC motors, the commutation is controlled electronically. For rotation to be achieved, the stator windings have to be energized in a sequence. The must common type of Brushless DC motors includes 3 stator windings. Every sequence has one of the windings energized to positive, the second to negative and the third is a non-energized condition.•The decision of which winding is to be energized relies heavily on knowing the rotor position (determined by the use of Hall effect sensors in the stator). The majority of DC Brushless motors have three Hall sensors on the non-driving end of the motor, and may be at 60° or 120°
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