ME350 L08-09 W19 DCMotor.pdf - ME350 Actuators Lectures 8...

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1 ME350: Actuators Lectures 8 and 9: Permanent Magnet DC Motor Torque, Speed, Power and Efficiency, Operation under load, Transmission
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2 Goal for these lectures: DC Motor Model (from Lectures 7 Slides) At what speed will the motor turn for a given load Understand power and efficiency of a DC motor Understand the need for transmission: Pros and Cons Motor Selection 2
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3 How to read Motor Specs
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4 How to read Motor Charts
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Motor Operation Limits SPEED ( ω ) TORQUE (T m ) Increasing V s Slope of lines remain the same No-Load Speed ω o = V S /K b 1
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6 Torque-Speed Curve The performance of motors are usually portrayed graphically in the form of a family of torque-speed characteristic. The Torque-Speed Curve gives how the torque supplied by the motor varies as a function of the speed of rotation of the motor for steady-state speeds for a given input (e.g., motor voltage or current). This graph will vary depending on the type of motor. Torque-speed curve of motor
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7 Torque-Speed Curves of Motors TORQUE SPEED AC motor Gasoline engine DC motor
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8 Operation Point Electric motor torque T M Torque load T L (e.g. fan) Speed Torque T M T L At this point T M = T L , and acceleration ceases Accelerating torque T M - T L T M - T L The motor operates where the torque-speed curve of the load and he motor intersect.
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9 Using Torque-Speed Curves Two main operations regions: I. Start Up Torque This is the torque required to change a speed in a motor.
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  • Winter '10
  • Shih
  • Electric motor, DC Motor Model, Motor Charts

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