By Electro-Craft Corporation
An Engineering instruction manual, DC vehicles velocity Controls Servo structures.
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Extra resources for DC Motors, Speed Controls, Servo Systems. An Engineering Handbook
Moments of inertia and angular positions of the load, motor, and tachometer by 1 ' J m ' J 2 ' a n d θλ' ö m ' θ2' r e s P e c t i v e l Y· Also, denote the stiffness and damping factors of the equivalent shafts by K1# D-j and K 2 , D 2 - Note that this model is an overall approximation and, hence, K 1 and D 1 may be influenced by characteristics of the motor armature, shaft, coupling, or the load. J In order to derive the dynamic equations for this system, let T 1 and T 2 be the torques delivered from the motor to J 1 and J 2 , respectively.
To evaluate P v we use the SI system, whereas the British system is used for the other terms. 2 ( 1 . 55 W 562+56-4-3 + ^ 4 2 - 3 2 In the following section we will discuss the ability of a motor to handle armature power dissipation. 5. THERMAL CHARACTERISTICS OF DC MOTORS As the motor is operated, power losses are dissipated in the armature, resulting in temperature rise. The increase of temperature is important since it may limit the motor performance and, therefore, it deserves a careful study.
19) Fig. 5. Parallel model for thermal system. 5. THERMAL ANALYSIS The temperature rise in a motor due to power losses may be determined from the transfer function model of Eq. 9). 21) 2-41 Therefore, the steady-state temperature rise due to constant power dissipation is the product of the power and the thermal resistance. Case 2 - Short Term Power Variations When the power loss variations are much Fig. 6. An example of "pulsed power". 22) ture. To determine the temperature rise due to the average power, use the results of Case 1 .