Download e-book for kindle: Automation Solution Guide by Shneider Electric

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These motors are designed for uses requiring a slip to adapt the speed according to the torque, such as: - several motors mechanically linked to spread the load, such as a rolling mill train or a hoist gantry, - winders powered by Alquist (see note) motors designed for this purpose, - uses requiring a high starting torque with a limited current inrush (hoisting tackle or conveyors). Their speed can be controlled by changing the voltage alone, though this function is being replaced by frequency converters.

42) gives a view of some products offered by one manufacturer (SKF). v Selection guide Choosing the right electric screwjack often requires detailed knowledge of the application and some calculation. However, manufacturers’ catalogues can help in making the initial choice of screwjacks meeting the basic criteria such as load and speed. A Fig. 42 Electrical screwjacks from SKF v Screwjack drives and parts Drives offered by manufacturers. Electric screwjacks can be driven by: - direct current motors, - asynchronous alternating motors, - brushless synchronous motors, - stepper motors.

For different types of use, fluid and progression rates (output in relation to the position of the throttle or the control signal in regulation valves). The throttle usually has a specific shape to prevent or mitigate any unwanted effects such as water hammer or cavitation. A Fig. 43 58 Cross viexw of a valve • Water hammer This can occur in hydraulic pipes when the valve is closed. The flow through the pipe is suddenly stopped and causes this phenomenon known as water hammer. 3. 8 Valves and electric jacks As an example (C fig.

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