You are working as a design engineer at a motorized wheelchair manufacturing com

Question

You are working as a design engineer at a motorized wheelchair manufacturing company. Your design team is developing a new product with 300 lbs. payload capacity, driven by two 24-V motors, each rated 200-W. You are assigned to designa converter with adjustable output voltage to supply the motors from two 12-V batteries. Your goal is to design a reliable and safe product for full-time indoor and outdoor use. The switching operations should not cause interference with digital audio devices and radio interference above 500kHz electromagnetic waves. In addition, the output voltage ripple must be less than 0.5% to avoid risk of interference with medical electronic instruments. es fo nts and as eet are available inductance value C. 5. (5) What do you suggest to ensure safe operation of the converter and prevent any risks to the life or health of the user?

Explanation / Answer

5)

1)Use ideal characteristics switches( IGBTS, MOSFETS). for the good working of the converter

2) Design the converter with good insulting strength materials

3)Avoid loose connections and un insulated wires contacts for the safey of the operator

4) Desing power cables properly for the converter

5)Operate the converter within the limits, ie upto the rated voltage and current

6) The operator should check before swithing the converter

7)The main supply of the converter should be checked by the operator before operating the converter

8)For the speed control purpose variable voltage method may be used. So that use proper control techniques for speed control(PWM technique )

9) All the rated motors should be properly enclosed

10) Do not operate the motors without checking terminals for the safety of the operator

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