Transcription of Motor torque, load torque and selection of motors
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Motor torque, load torque and selection of motors
2/41. Motor torque , load torque and 2 selection of motors Contents Motor speed torque curve 2/43. NEMA rotor designs 2/43. Special designs of rotors 2/44. Double squirrel cage motors 2/44. Other designs of rotor cage 2/45. Effect of starting current on torque 2/46. NEMA recommendations on starting currents 2/47. load torque or opposing torque 2/47. selection of motors 2/47. Time of start-up and its effect on Motor performance 2/47. Motor heating during start-up 2/49. Heating during a no- load start-up 2/50. Heating during an on- load start-up 2/50. Thermal withstand time 2/50. Heating phenomenon in a Motor during a stalled condition 2/51. Plotting thermal withstand characteristics of the Motor 2/52. Braking 2/54. Types of braking 2/54. Inching or jogging 2/58. Number of starts and stops 2/59. Relevant Standards 1/60. List of formulae used 2/60.
Motor torque, load torque and selection of motors 2/43 2.1 Motor speed–torque curve Refer to Figure 2.1 where T st = starting torque or breakaway torque. T m = minimum, pull-in or pull-up torque. T po = pull-out, breakdown or maximum torque, obtainable over the entire speed range.
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