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Method and apparatus for electromagnetically braking a motor
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 2011 |
| Description | An electromagnetic braking system and method is provided for selectively braking a motor using an electromagnetic brake having an electromagnet, a permanent magnet, a rotor assembly, and a brake pad. The brake assembly applies when the electromagnet is de-energized and releases when the electromagnet is energized. When applied the permanent magnet moves the brake pad into frictional engagement with a housing, and when released the electromagnet cancels the flux of the permanent magnet to allow a leaf spring to move the brake pad away from the housing. A controller has a DC/DC converter for converting a main bus voltage to a lower braking voltage based on certain parameters. The converter utilizes pulse-width modulation (PWM) to regulate the braking voltage. A calibrated gap is defined between the brake pad and permanent magnet when the brake assembly is released, and may be dynamically modified via the controller. |
| File Size | 722540 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110023489 |
| Archival Resource Key | ark:/13960/t8tb64381 |
| Language | English |
| Publisher Date | 2011-11-29 |
| Access Restriction | Open |
| Subject Keyword | Electronics And Electrical Engineering Controllers Electric Potential Patents Braking Calibrating Rotors Inventions Friction Factor Electromagnets Permanent Magnets Pulse Duration Modulation Voltage Converters Dc To Dc Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
