Define Speed in Rotating Machines: Answer & SI Units

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Speed in rotating machines refers to the rate at which an object rotates, commonly measured as angular velocity, with the SI unit being radians per second (rad/s). Torque-speed matching is crucial in motor-driven machine design because it ensures that the motor can provide sufficient torque at various speeds for optimal performance. For a fan load, the torque-speed curve typically shows a decrease in torque as speed increases, while for a high static friction load, the curve indicates higher torque requirements at lower speeds. Understanding these characteristics helps in selecting the appropriate motor for specific applications. Proper torque-speed matching enhances efficiency and prevents motor overload.
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electronics question
Define the term “Speed” as employed in rotating machines, and state its (S.I)
units.

anyone know the answer? is it rad per second?
 
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I suspect it's angular velocity, which indeed has the unit rad/s.
 
Explain why “Torque-Speed” matching is important in designing motor-driven
machines. Illustrate your answer with torque-speed plots characteristic of:

i) A fan load

ii) A high static friction load

?!?1?111one
 
Thread 'Have I solved this structural engineering equation correctly?'

Thread 'Have I solved this structural engineering equation correctly?'

Hi all, I have a structural engineering book from 1979. I am trying to follow it as best as I can. I have come to a formula that calculates the rotations in radians at the rigid joint that requires an iterative procedure. This equation comes in the form of: $$ x_i = \frac {Q_ih_i + Q_{i+1}h_{i+1}}{4K} + \frac {C}{K}x_{i-1} + \frac {C}{K}x_{i+1} $$ Where: ## Q ## is the horizontal storey shear ## h ## is the storey height ## K = (6G_i + C_i + C_{i+1}) ## ## G = \frac {I_g}{h} ## ## C...
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