Drive system for linear and rotary movements
A drive system includes a rotary drive unit for rotating a shaft and a linear drive unit for moving the shaft in a linear direction. To improve efficiency and shelf life, an energy storage is mechanically connected to the shaft for biasing the shaft to seek a linear movement in opposition to the linear direction. The energy storage absorbs the kinetic energy of the shaft and releases it again subsequently.
1. A drive system, comprising:
a rotary drive unit for rotating a shaft;
a linear drive unit for moving the shaft in a linear direction; and
an energy storage mechanically connected to the shaft for so biasing the shaft as to seek a linear movement in opposition to the linear direction, wherein the energy storage includes a cup firmly mounted to the shaft and movable in the linear direction by the linear drive unit, said cup having a projection for engagement in a stationary ring-shaped member, wherein the projection and the ring-shaped are magnetized in opposite direction.
2. The drive system of claim 1 , wherein the electric spring includes two charged plates.
3. The drive system of claim 1 , wherein the energy storage includes a mechanical spring.
4. The drive system of claim 1 , wherein the rotary drive unit includes an electric motor.
5. The drive system of claim 1 , wherein the linear drive unit includes an electric linear motor.
6. A drive system, comprising:
a rotary drive unit for rotating a shaft;
a linear drive unit for moving the shaft in a linear direction; and
an energy storage mechanically connected to the shaft for so biasing the shaft as to seek a linear movement in opposition to the linear direction, wherein the energy storage includes a magnetic spring.
7. The drive system of claim 6 , wherein the rotary drive unit includes an electric motor.
8. The drive system of claim 6 , wherein the linear drive unit includes an electric linear motor.
9. The drive system of claim 6 , wherein the magnetic spring includes magnets so disposed as to repel one another.
10. A drive system, comprising:
a rotary drive unit for rotating a shaft;
a linear drive unit for moving the shaft in a linear direction; and
an energy storage mechanically connected to the shaft for so biasing the shaft as to seek a linear movement in opposition to the linear direction, wherein the energy storage includes an electric spring.
11. The drive system of claim 10 , wherein the rotary drive unit includes an electric motor.
12. The drive system of claim 10 , wherein the linear drive unit includes an electric linear motor.
13. A drive system, comprising:
a rotary drive unit for rotating a shaft;
a linear drive unit for moving the shaft in a linear direction; and
an energy storage mechanically connected to the shaft for so biasing the shaft as to seek a linear movement in opposition to the linear direction, wherein the energy storage includes a pneumatic spring.
14. The drive system of claim 13 , wherein the rotary drive unit includes an electric motor.
15. The drive system of claim 13 , wherein the linear drive unit includes an electric linear motor.