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How to Design a Custom Brushless PM Motor
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When off-the-shelf motors can’t meet the specs, you might have to go custom, but it’s not as bad as it used to be.
Pilotless aircraft engine controls and avionics have joined with the “X-box” and miniature motor-control devices and graphics displays to create a new generation aircraft designated the Unmanned Aerial Vehicle or UAV. Aerial vehicle names like the Predator, Reaper, Shadow and Mexican-S4 are currently working in strategically assigned reconnaissance roles.
Designing a custom motor can be an expensive undertaking, and most of us try to avoid doing so. But sometimes cost has to be a secondary consideration, especially when an off-the-shelf unit cannot be made to meet certain tough specifications—such as military standards AS9100. This is roughly the equivalent of the more familiar ISO 9000 industry standards, wherein both documents demand a rigorous control and quality assurance system.
One specific design example is an electric fuel-pump motor developed for an Unmanned Aerial Vehicle (UAV) such as the Predator, Reaper, Shadow and Mexican-S4. No off-the-shelf motor can survive the challenging environment needed for this UAV application, so a custom one had to be designed. What made this small motor-design job particularly tough was meeting the torque requirement over a specific temperature range at an unusually low motor weight. Other hurdles included a tight schedule, the ability to maintain robust communications with a specific pump manufacturer, match the motor to a drive, and engage some prior application experience on the motor maker’s side that was necessary to mate the motor, pump and drive components flawlessly.
Full Article Here>>
When off-the-shelf motors can’t meet the specs, you might have to go custom, but it’s not as bad as it used to be.
Pilotless aircraft engine controls and avionics have joined with the “X-box” and miniature motor-control devices and graphics displays to create a new generation aircraft designated the Unmanned Aerial Vehicle or UAV. Aerial vehicle names like the Predator, Reaper, Shadow and Mexican-S4 are currently working in strategically assigned reconnaissance roles.
Designing a custom motor can be an expensive undertaking, and most of us try to avoid doing so. But sometimes cost has to be a secondary consideration, especially when an off-the-shelf unit cannot be made to meet certain tough specifications—such as military standards AS9100. This is roughly the equivalent of the more familiar ISO 9000 industry standards, wherein both documents demand a rigorous control and quality assurance system.
One specific design example is an electric fuel-pump motor developed for an Unmanned Aerial Vehicle (UAV) such as the Predator, Reaper, Shadow and Mexican-S4. No off-the-shelf motor can survive the challenging environment needed for this UAV application, so a custom one had to be designed. What made this small motor-design job particularly tough was meeting the torque requirement over a specific temperature range at an unusually low motor weight. Other hurdles included a tight schedule, the ability to maintain robust communications with a specific pump manufacturer, match the motor to a drive, and engage some prior application experience on the motor maker’s side that was necessary to mate the motor, pump and drive components flawlessly.
Full Article Here>>
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