Appliance Design - January 2008 - (Page 37)

Conventional Radial Motor Rotor USMicro-III fan Controller 1 component MOTORS 5V Supply Vdd Stator QSI Vertical Motor Rotor Tach or Alarm USMicro-III Three Phase Speed control (Optional) Test Motor Coils, Three Fan controller VSS Stator Fig. 4. Conventional radial motor vs. vertical motor. Outward facing stator shown above. Fig. 6. 1-Watt, 3-phase drive system PCB and block diagram. drive. This kind of drive saves controller cost, but uses two times the wire, 10 percent more stator material, and has higher torque ripple as compared to a bipolar drive. The cost penalty on the motor side is considerably less than the cost savings on the controller side. Fig. 3 shows the first two of the three commutation sequences. Magnetics the motor shaft or outward away from the To better understand the vertical architec- shaft. This form of architecture is necesture motor, which has been named the Powder sary because the stator is made of a stacked Keg® (3), one must first understand the basic series of steel laminations. Because laminamotor architecture of conventional brushless tions are magnetically two dimensional, (in terms of efficient magnetic flux transfer), permanent magnet motors (BLDC). The stator poles of conventional (hori- sound engineering requires that the11/8/07 stator AD12071Vent:ApplDesign 1/4 Ignition coils zontal) BLDC motors face inward toward pole laminations lie in a plane perpendicu- 1:22 Transformers, Inductors, Coils & Ignition Coils UL/CSA/CE Standards & Medical UL2601 Featuring Standard & Custom SMT Products Capacitors • Varistors • Transformers • Plug-In Power Adapters 346 Monroe Ave., Kenilworth, NJ 07033 Tel: (908) 272-9262 • Fax: (908) 272-7630 www.ventronicsinc.com • e-mail: ventronics@prodigy.net For more Information Enter 111 www.applianceDESIGN.com AD01084AmRad.indd 1 11/30/07 9:37:11 AM For more Information Enter 112 applianceDESIGN January 2008 37 http://www.AmericanRadionic.com http://www.ventronicsinc.com http://www.AmericanRadionic.com http://www.AmericanRadionic.com http://www.ventronicsinc.com http://www.appliancedesign.com

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Appliance Design - January 2008 Contents Editorial Shipments/Forecasts News Watch Makers of Commercial Refrigeration Equipment Turn to Variable-Speed Motors to Improve Energy Efficiency. New Motor Design and Control Scheme Makes Brushless Motors More Economically Feasible for a Wider Range of Applications. External Gas Molding, a Relatively New Technique, Solves Many of the Challenges Associated with the Injection Molding of Large Plastic Parts. Plastic Housings Offer Many Benefits: EMI Protection Isn't One of Them. But, New Materials and Techniques are Solving that Problem. Choosing the Optimal Strategy for Effective EMI Shielding Depends on Both Mechanical and Electrical Requirements Ethernet-Enabled Microcontroller Makes Networking Schemes Easier and More Cost Effective to Implement The Ever-Changing Array of Microcontroller Memory Options Makes it Imperative to Keep Abreast of What's Available to Determine the Optimal Choice for an Application. A Vast Range of Components and Finished Products will be Exhibited at the Country's Preeminent HVAC/R Show, AHR Expo, which is Scheduled for Jan. 22-24 in New York. Advertiser's Index Association Report: PRBA

Appliance Design - January 2008

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