hw4 - + + = 3 2 1 3 2 1 9 3 1 3 8 1 2 1 1 2 4 i i i x x...

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EE321 Spring 08 Homework 4 Problem 16 – Calculation of Torque The co-energy of a rotory electromechanical device may be expressed i W c λ 2 1 = where i rm ) 2 cos 2 5 ( θ + = where rm is the rotor position and i is the current. What is the electromagnetic torque ? Problem 17 – Conditions on a Conservative Magnetic System An engineer is designing a two-winding electromechanical device, and decides that the flux linkage equations are represented by the following relationships: x i i i x i i i + + = + + = 5 3 01 . 0 5 1 . 0 8 . 0 2 1 2 2 8 . 0 2 1 1 1 Is this a feasible description for a system with a lossless field? Problem 18 – Magnetic Linearity Is the following system magnetically linear? 2 2 1 1 5 7 5 x i i + + = 2 1 2 2 5 7 2 x i i + + = Problem 19 – Magnetically Linear System The flux linkage equations of a magnetically linear system may be expressed
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Unformatted text preview: + + = 3 2 1 3 2 1 9 3 1 3 8 1 2 1 1 2 4 i i i x x Compute the force. CONTINUED ON NEXT PAGE Problem 20 Review of Torque Concepts The front of a motor is facing you. Attached to the shaft of the motor is a 10 cm beam (it is centered on the shaft and oriented from left to right). On the right side of the beam a 2.5 Kg mass is located. Everything is stationary the motor is producing the exact amount of torque to cancel that caused by the mass and beam. How much load torque is produced and in what direction (clockwise or counterclockwise)...
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hw4 - + + = 3 2 1 3 2 1 9 3 1 3 8 1 2 1 1 2 4 i i i x x...

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