| 摘要 |
PROBLEM TO BE SOLVED: To provide an X-ray imaging device for round visits by doctors that can be smoothly operated at the start, additional, regular and reduced velocities and at a sudden stop to meet an emergency. SOLUTION: CPU 11 receives input signals F from a laver handle 14 and velocity signals V from right and left encoders 3, 4 provided at wheel shafts and judges whether or not it is in acceleration or deceleration and switches the circuit of a bridge-structured switching element of a motor driving circuit 9 through a switching circuit 37 at the off-duty time of a PWM control circuit 10. When in the acceleration, the switching element of grounded side is turned onto reflux the counter electromotive force at the time of switching off, while, when in the deceleration, all the switching elements are turned off to enable smooth operation.
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