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Controller and associated drive assembly for power sharing, time sliced control of a brushless direct current motor
| Details |
Inventors: Atmur, Robert J.;
Assignee: The Boeing Company (Seattle, WA)
Primary Examiner: Nappi; Robert E.
Assistant Examiner: Colon-Santana; Eduardo
Attorney, Agent or Firm: Alston & Bird LLP
A controller for controlling a BLDC motor controller includes a drive assembly, and a processing element. The processing element is in electrical communication with the drive assembly and the BLDC motor, and the processing element is capable of controlling operation of the drive assembly. The drive assembly, is in electrical communication with a power supply and the BLDC motor. The drive assembly includes a plurality of half-bridge assemblies that each include two switching elements. In this regard, at least two half-bridge assemblies are electrically connected to each phase winding of the BLDC motor. Thus, each switching element is capable of operating at an operating frequency with a first duty ratio such that the half-bridge assemblies are capable of providing the pulse-width-modulated input voltage to the respective phase winding of the BLDC motor at the operating frequency at a second duty ratio higher than the first duty ratio. |
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DETAILED DESCRIPTION In light of the foregoing, various embodiments of the present invention provide an improved controller and associated drive assembly for power sharing, time sliced control of a brushless direct current (BLDC) motor, where the motor includes a predetermined number of phase windings.
Various embodiments of the controller and associated drive assembly of the present invention include a plurality of switching elements, such as IGBT's, arranged such that the power dissipation of each switching element is reduced, as compared to the switching elements of a conventional driver.
In this regard, the switching elements can be operated at a desired frequency with a duty cycle less than the duty cycle of the operating frequency at which the switching elements of the drive assembly collectively drive the BLDC motor.
Further, even though the drive assembly of embodiments of the present invention provide for more switching elements than the conventional driver, the number of transitions of the switching elements does not increase.
Thus, operation of the drive assembly of the present invention does not reduce the efficiency of the switching elements, as compared to a conventional drive assembly.
According to one embodiment, a controller for controlling a BLDC motor controller includes a drive assembly, and a processing element.
The processing element is in electrical communication with the drive assembly and the BLDC motor, and the processing element is capable of controlling operation of the drive assembly.
The drive assembly, on the other hand, is in electrical communication with a power supply and the BLDC motor.
As such, the drive assembly is capable of receiving a voltage output of the power supply and is capable of providing a pulse-width-modulated input voltage to the BLDC motor.
The drive assembly includes a plurality of half-bridge assemblies that each include two switching elements, such as insulated gate bipolar transistors (IGBT's).
In this regard, at least two half-bridge assemblies are electrically connected to each phase winding of the BLDC motor
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