DC Motors for Missile Fin Actuation Systems
Missile systems require precision control to navigate and intercept targets while being exposed to extreme environments, including wide temperature ranges and heavy vibrations. Within the larger missile system is the missile fin actuation system, which oversees the movement and positioning of the missile fins (also known as control fins) in response to the steering commands from the flight computer. Miniaturized, lightweight technologies are essential to improving the maneuverability of these mission-critical systems, as when a missile is launched, these control fins position the trajectory of the missile towards the intended target.
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Topics:
Aerospace & Defense,
DC motors
Estimate Brush DC Motor Reliability With Confidence
When it comes to manufacturing advanced medical instruments, reliability is a critically important consideration for coreless miniature DC motors. To estimate a motor’s expected lifetime, manufacturers employ reliability tests to measure a motor’s survivability against typical stresses like torque, speed, temperatures and vibration. Because it can take months or years to test a motor’s resistance to these conditions, accelerated life testing (ALT) over an abbreviated schedule is often the most practical testing approach.
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Topics:
Brush DC Motors,
Portescap,
DC motors,
DC motor lifetime testing,
DC motor B10 reliability,
medical instruments,
coreless brush DC motors,
motor reliability analysis,
motor lifetime,
Weibull analysis,
Weibull distribution,
torque speed curve,
DC monitor reliability testing,
time-to-failure,
TTF,
DC motor B10 life
Motion System Options for HVAC Gas Valve Actuators
In HVAC systems that provide heat for enclosed spaces, gas and liquid flow must be controlled and metered accurately using sensing and modulating elements such as flow control valves or isolation valves. Some control valves are opened and closed manually at the valve stem, while electronic valves incorporate an actuator to move the stem with control from a motor and drive system. Designers have three motor types to choose from, depending on the application requirements. Here’s a summary of the motion system options:
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Topics:
Stepper Motors,
brushed DC motors,
Portescap,
DC motors,
motor selection,
electric damper actuators,
HVAC systems,
HVAC,
gas and liquid flow,
fluid control,
linear stepper motors,
actuators,
HVAC gas valve actuators,
position system,
rotary motion,
linear motion,
closed loop positioning
How To Select a DC Motor Coil Based on the Required Working Point and Power Supply
Although DC motors have a common operating principle, many applications — including portable medical devices like infusion pumps — require one that converts electrical energy to mechanical energy with the highest efficiency to achieve a long, reliable service life. This is typically where an ironless DC motor comes in.
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Topics:
Portescap,
DC motors,
ironless DC motors,
Portescap 16DCT ironless DC motor,
Athlonix ironless DC motor,
DC motor coil selection,
DC motors for portable medical devices,
high-efficiency DC motors,
motor coil selection
Improve Thermal Performance for Ironless Brush DC and Brushless DC Motors
Electric motor manufacturers must ensure that a motor’s instant internal temperature never exceeds its various components’ maximum allowable temperature. Depending on the design of the motor and the materials used, thermal phenomena will dictate the motor’s performance. Motor designers typically have two options to enhance motor performance without overheating and damaging its components: increase power conversion efficiency by generating less heat for a given mechanical power output or improve the motor's cooling capability through heat dissipation.
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Topics:
brushed DC motors,
Portescap,
Brushless DC motors,
DC motors,
iron losses,
power conversion,
heat dissipation,
spotless brushless motors,
motor design,
thermal management,
power losses,
temperature rise,
steady state operation,
heat transfer,
thermal resistance,
excessive temperature,
electrical resistance,
thermal conductivity,
transient operation,
peak torque,
periodic duty cycle
Understand the Effect of PWM When Controlling a Brushless DC Motor
Designers of motion systems often face challenges when selecting or developing electronics using pulse width modulation (PWM) to drive brushless DC motors. To avoid unexpected performance issues, it’s important to understand some of the basic concepts.
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Topics:
PWM drive,
pulse width modulation,
Portescap,
brushless DC motor,
DC motors,
PWM regulations,
PWM method,
PWM frequency,
chopper amplifiers,
ripple,
joules losses,
iron losses,
Faraday-Lenz law of induction,
linear amplifiers,
eddy currents
