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
