Predictive pulse width modulation for an open delta H-bridge driven high efficiency ironless permanent magnet machine

• US 8,796,978 B2
• Filed: 05/01/2012
• Issued: 08/05/2014
• Est. Priority Date: 09/23/2008
• Status: Active Grant

• Current Assignee: Aerovironment
• Original Assignee: Aerovironment
• Inventors: Daboussi, Zaher Abdallah
• Primary Examiner(s): Paul, Antony M
• Application Number:
  US13/460,976
• Publication Number:
  US 20120326651A1
• Time in Patent Office: 826 Days
• Field of Search: 318/599, 318/811, 388/804, 388/811, 388/819, 363/41, 363/71, 347/144, 700/296
• US Class Current: 318/599
• CPC Class Codes: F02D 2041/2027 Control of the current by pulse width modulation or duty cycle control
• CPC Class Codes: F02D 2041/2051 using voltage control
• CPC Class Codes: F02D 2041/2058 using information of the actual current value
• CPC Class Codes: F02D 41/20 Output circuits, e.g. for controlling currents in command coils
• CPC Class Codes: G05B 11/28 using pulse-height modulation; using pulse-width modulation
• CPC Class Codes: H02P 23/14 Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage

Abstract

Embodiments of the present method and system permit an effective method for determining the optimum selection of pulse width modulation polarity and type including determining machine parameters, inputting the machine parameters into a predicted duty cycle module, determining the optimum polarity of the pulse width modulation for a predicted duty cycle based on a pulse width modulation generation algorithm, and determining the optimum type of the pulse width modulation for a predicted duty cycle based on the pulse width modulation generation algorithm.

Claims

1. A method for determining a predictive duty cycle that is able to determine the magnitude and pulse width of an H-bridge pulse width modulation that is used to drive a machine motor, comprising:

determining one or more machine parameters;

inputting the machine parameters into a predicted duty cycle module;

determining the optimum polarity, selected from a negative polarity or a positive polarity, of the pulse width modulation for a predicted duty cycle based on a pulse width modulation generation algorithm; and

determining, during a transition period in which machine emf voltage has a different polarity from a terminal voltage, whether the pulse width modulation is unipolar or bipolar for a predicted duty cycle based on the pulse width modulation generation algorithm.

2. A system for determining a predictive duty cycle that is able to determine the magnitude and pulse width of an H-bridge pulse width modulation that is used to drive a machine motor, comprising:

means for determining one or more machine parameters;

means for inputting the machine parameters into a predicted duty cycle module;

means for determining the optimum polarity, selected from a negative polarity or a positive polarity, of the pulse width modulation for a predicted duty cycle based on a pulse width modulation generation algorithm; and

means for determining, during a transition period in which machine emf voltage has a different polarity from a terminal voltage, whether the pulse width modulation is unipolar or bipolar for a predicted duty cycle based on the pulse width modulation generation algorithm.

3. A non-transitory computer-readable medium for determining a predictive duty cycle that is able to determine the magnitude and pulse width of an H-bridge pulse width modulation that is used to drive a machine motor, comprising:

means for determining one or more machine parameters;

means for inputting the machine parameters into a predicted duty cycle module; and

means for determining the optimum polarity, selected from a negative polarity or a positive polarity, of the pulse width modulation for a predicted duty cycle based on a pulse width modulation generation algorithm; and

means for determining, during a transition period in which machine emf voltage has a different polarity from a terminal voltage, whether the pulse width modulation is unipolar or bipolar for a predicted duty cycle based on the pulse width modulation generation algorithm.