Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2008-03-25
2008-03-25
Masih, Karen (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S811000, C318S800000, C318S807000, C363S056070
Reexamination Certificate
active
07348755
ABSTRACT:
Methods and apparatus are provided for frequency scaling the PWM signal output of a controller/driver for an electrical device such as a BLDC motor. The apparatus comprises a number of multiple half-bridge assemblies, with each multiple half-bridge assembly connected to a respective phase winding of the motor. Each individual half-bridge assembly is operated within the frequency limit of its internal switching elements, but the composite output frequency of each multiple half-bridge assembly can be the product of the switching element frequency and the number of individual half-bridge assemblies in the multiple half-bridge assembly. High-speed torque loop control is implemented by synchronizing multiple DSP's with overlapping interrupts, so that the output pulse width of the PWM signal can be adjusted on a pulse-to-pulse basis. Moreover, the frequency scaling and pulse-to-pulse control processes can be achieved with standard off-the-shelf devices.
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Ingrassia Fisher & Lorenz P.C.
Masih Karen
The Boeing Company
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