| 摘要 |
An electric wheelchair comprises a body, two rear wheel, a front wheel, at least an electric motor and a controller. In the two rear wheel and the front wheel, at least one wheel is driven by the electric motor. The safety wheelchair also comprises a decelerator which is a means consists of short-circuit connection of a conductor with a load and coils so the driving motor by the decelerator switch. When the electric wheelchair goes forward with a speed greater or less than the predetermined value, the controller gives a signal so that the switch of the decelerator turns on or off. While the switch is on, the electric motor is changed into an electric generator so that the wheelchair can automatically decelerate when goes around a turn or naturally downslide along an incline to ensure that the wheelchair can not be overturned as result of the overspeed of the turning. The load of the decelerator may be a means, which can recharge a battery so that the redundant kinetic energy of the wheelchair carrying person can be changed into electric energy recharging the battery when the wheelchair decelerates. The wheelchair has electric braking system. The wheelchair can be automatically braked at once by turning off the actuating switch of the wheelchair while running. |
