Electricity: motive power systems – Braking – Plural – diverse or diversely controlled braking means
Reexamination Certificate
2009-05-29
2011-11-29
Budd, Mark (Department: 2837)
Electricity: motive power systems
Braking
Plural, diverse or diversely controlled braking means
C318S372000
Reexamination Certificate
active
08067909
ABSTRACT:
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.
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Davis Donald R.
Mehling Joshua S
Parsons Adam H
Permenter Frank Noble
Radford Nicolaus A
Budd Mark
GM Global Technology Operations LLC
Quinn Law Group PLLC
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