By Electro-Craft Corporation
An Engineering guide, DC vehicles velocity Controls Servo platforms.
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Additional info for DC Motors, Speed Controls, Servo Systems. An Engineering Handbook
Sample text
00393x130 = 367 oz-in Ia = J i 2 ? 8): T g = 6 . 4 8 x 8 0 = 518oz-in T With armature at 155 °C and ambient of 25 °C, we estimate magnet temperature will b e 9 0 ° C . 002 x 65 ~ - = ·.
Stalled torque tends to be higher, and speed-torque curves more linear for the permanent magnet motors, compared to a shunt motor. In the case of the ceramic permanent magnet (Fig. ), the armature reaction flux stays orthogonal to the permanent magnet flux, since the permeability of ceramic Opposing flux Shunt field winding flux Aiding flux Armature reaction flux tends to follow low reluctance path through pole shoe Fig. 7. Demagnetization effect in wound-field motors is caused by a component of the armature reaction field.
81) The transfer function was examined for several motors, under various load conditions, and was found to be in excellent agreement with the theoretical analysis given above. 4 gcnrr), the following poles and zeros were measured: P-l = - 20 Hz p 3 4 = - 2 0 0 ± j 4900 Hz 2-26 Fig. 4. Poles and zeros of motor-tachometer transfer function. The analysis of the resonance phenomenon was based on the assumption model of the three bodies with inertialess shafts, where the stiffness and damping were constant for each shaft.
