Electric patient bed

1. Electric Patient Bed

2. Electric hospital bed A hospital bed is a bed specially designed for hospitalized patients or others in need of some form of health care. These beds have special features both for the comfort and well-being of the patient and for the convenience of health care workers. Common features include adjustable height for the entire bed, the head, and the feet, adjustable side rails, and electronic buttons to operate both the bed and other nearby electronic devices. Hospital beds and other similar types of beds are used not only in hospitals, but in other health care facilities and settings, such as nursing homes, assisted living facilities, outpatient clinics, and in home health care.

3. Size: Twin-size hospital bed measurements: (91.4cm)W x (203.19cm)L (outside overall end-to-end length: (220.97cm))Lift Range: Head - 60˚, Knee - 30˚.Maximum patient weight:158.7kg . Bed Height Casters in Standard Position: Min. 33cm, Max. 59.68cm (at deck level

5. Ac / Dc

6. H-bridge

8. Electrical safty & Isolation

10. R2 R3 F1 F2 R1 R4

12. X = ـــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ W1X1 + W2X2 + WnXn W1 + W2 + Wn

16. Motor Types AC Motors Advantages Simple Design Low Cost Reliable Operation Easily Found Replacements Variety of Mounting Styles Many Different Environmental Enclosures Disadvantages · Expensive speed control · Inability to operate at low speeds · Poor positioning control DC Motors Advantages Easy to understand design Easy to control speed Easy to control torque Simple, cheap drive design Disadvantages Expensive to produce Can't reliably control at lowest speeds Physically larger High maintenance Dust

17. DC motor Servo motor A servomechanism, or servo is an automatic device that uses error-sensing feedback to correct the performance of a mechanism. The term correctly applies only to systems where the feedback or error-correction signals help control mechanical position or other parameters. For example, an automotive power window control is not a servomechanism, as there is no automatic feedback which controls position—the operator does this by observation. By contrast the car's cruise control uses closed loop feedback, which classifies it as a servomechanism. Stepper motors Stepper motors were and still are often used in computer printers, optical scanners, and digital photocopiers to move the optical scanning element, the print head carriage (of dot matrix and inkjet printers), and the platen. Likewise, many computer plotters (which since the early 1990s have been replaced with large-format inkjet and laser printers)