Understanding DC motors through experiments |
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| Authors: | Harish Ravi Rajesh B Khaparde |
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| Institution: | 1. Department of Electrical Engineering, IIT Madras, Chennai, 600036, India
2. Homi Bhabha Centre for Science Education, TIFR VN PuravMarg, Mankhurd, Mumbai, 400088, India
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| Abstract: | We present here a set of simple experiments through which various characteristics of a DC motor can be investigated. The experiments also provide insights on how to control a DC motor. We first study the back-emf versus angular speed and the torque versus current characteristics. We then extract the moment of inertia of the rotor and the speedtorque curve for the load from the start-stop dynamics of the motor. Finally, we study an alternate way of obtaining the angular speed from the back-emf waveform. |
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