1. An actuating device for regulating a control mechanism subjected to a force against the direction of regulation, whereby the actuating device comprises:
a drive shaft;
a rotating spindle spaced axially apart from and connected in a moveable manner to said drive shaft;
an actuating element adapted to be axially displaced by said rotating spindle in the direction of regulation;
at least two electric motors, each motor adapted to be actuated and controlled both individually and in co-operation, each of the at least two electric motors being capable of rotating said drive shaft in a feed direction; and
a housing adapted to receive the actuating device.
2. The actuating device according to claim 1, wherein said electric motors are arranged one behind the other in both directions of rotation in the longitudinal direction of said drive shaft.
3. The actuating device according to claim 1, further comprising a dedicated motor control device is assigned to each of said electric motors.
4. The actuating device according to claim 1, wherein said electric motors are servomotors.
5. The actuating device according to claim 1, further comprising a rotating sleeve adapted to be driven by said drive shaft via a transmission device and rotationally rigidly connected to a ball nut of a feed device, wherein said rotating spindle is a recirculating ball spindle and is rotationally supported in the ball nut for movement in the regulation direction.
6. The actuating device according to claim 5, further comprising:
a ring flange rotationally rigidly arranged in said housing; and
a first spiral spring attached to said rotating sleeve and said ring flange so as to prevent rotation of said rotating sleeve in a direction opposite the feed direction.
7. The actuating device according to claim 6, wherein said ring flange protrudes from a transverse wall in said housing and is essentially coaxial to said drive shaft and said rotating sleeve.
8. The actuating device according to claim 7, further comprising:
a retaining sleeve rotationally rigidly connected at the first end to the transverse wall of said housing;
a guide sleeve adapted to allow longitudinal displacement and limit rotational displacement of said actuating element;
a second spiral spring attached to the second end of said retaining sleeve and said guide sleeve so as to prevent rotation of said guide sleeve opposite the feed direction.
9. The actuating device according to claim 8, wherein said actuating element is connected to the recirculating ball spindle via a spindle head.
10. The actuating device according to claim 9, wherein the spindle head comprises at least one guide element, protruding radially outwards; and adapted to engage a longitudinal guide disposed on said guide sleeve and running along the regulating direction.
11. The actuating device according to claim 10, wherein said second spiral spring is drive-connected to a first stepper motor.
12. The actuating device according to claim 11, wherein the first stepper motor is drive-connected to a clamping sleeve from which a dog protrudes radially inwards, the dog being connected to one end of the second spiral spring.
13. The actuating device according to claim 12, wherein the clamping sleeve is rotationally supported on an outer side of the retaining sleeve and an outer side of a ring flange protruding from an inner side of said cover.
14. The actuating device according claim 13, further comprising a torsion spring arranged between the clamping sleeve and the ring flange, wherein the torsion spring is tensed by rotating the clamping sleeve.
15. The actuating device according to claim 12, wherein the first stepper motor has a first gearwheel adapted to engage teeth disposed on one end of the clamping sleeve.
16. The actuating device according to claim 15, wherein a second stepper motor is arranged diametrically opposite the first stepper motor and is adapted to drive a second gearwheel adapted to engage the teeth on the clamping sleeve.
17. The actuating device according to claim 16, wherein the teeth are formed by a toothed ring with inner teeth, wherein the toothed ring is releasably mounted on the end of the clamping sleeve.
18. The actuating device according to claim 1, wherein the at least two electric motors can be actuated and controlled independently of one another.
19. The actuating device according to claim 1, wherein the at least two electric motors are stepper motors.
20. The actuating device according to claim 1, wherein at least two separate electrical connections are arranged on the housing cover adjacent to the electric motors.
21. The actuating device according to claim 1, wherein both electric motors can be operated simultaneously.
22. The actuating device according to claim 1, wherein the electric motors are synchronized by software via their motor control devices.
23. The actuating device according to claim 1, wherein one electric motor is used as the master and the other electric motor is used as the slave.
24. The actuating device according to claim 1, wherein the electric motors are direct current motors.
25. The actuating device according to claim 1, further comprising a position sensor assigned to the drive shaft.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of paging an idle-mode terminal by a relay station in a multi-hop relay communication system, the method comprising:
receiving a message from a base station belonging to a same paging group with the relay station, the message including superframe number offset information which indicates a superframe number offset to be staggered by the relay station;
receiving an idle mode request message from the terminal;
sending an idle mode response message to the terminal, the idle mode response message including paging information;
receiving a first superframe from the base station, the first superframe including a paging message of the terminal and having a first superframe number;
staggering a second superframe number of a second superframe including the paging message by the superframe number offset from the first superframe number in a decreasing order; and
sending the second superframe including the paging message and having the staggered second superframe number to the terminal.
2. The method of claim 1, wherein the relay station send the second superframe via a downlink transmit zone.
3. The method of claim 1, wherein the paging information in the idle mode response message comprises a paging group ID, a paging cycle, a paging listening interval and a paging offset.
4. A method of receiving a paging message by an idle mode terminal in a multi-hop relay communication system, the method comprising:
sending an idle mode request message to a base station or a relay;
receiving an idle mode response message from the base station or the relay, the idle mode response message including paging information which comprises a paging group ID, a paging cycle, a paging listening interval, and a paging offset;
determining a superframe number necessary for monitoring a paging message based on a relay link delay and multi-hop relay count information obtained from the base station or the relay; and
receiving a superframe including the paging message from the relay using the determined superframe number, the superframe having the superframe number staggered by the relay by a superframe number offset.
5. The method of claim 4, wherein the multi-hop relay count information or the delay time information on the relay link is received by being included in the superframe header or the idle mode response message.
6. A relay station, characterized by transferring a paging message to an idle mode terminal in a multi-hop relay communication system, the relay comprising:
a receiver configured to receive a message from a base station belonging to a same paging group with the relay station, the message including superframe number offset information which indicates a superframe number offset to be staggered by the relay station, and to receive a first superframe from the base station, the first superframe including a paging message of the idle mode terminal and having a first superframe number:
a controller configured to stagger a second superframe number of a second superframe including the paging message by the superframe number offset from the first superframe number in a decreasing order; and
a transmitter configured to send the second superframe including the paging message and having the staggered second superframe number to the terminal.
7. A terminal, characterized by operating in an idle mode in a multi-hop relay communication system, the terminal comprising:
a transmitter configured to send an idle mode request message to a base station or a relay;
a controller configured to determine a superframe number necessary for monitoring a paging message based on a relay link delay and multi-hop relay count information obtained from the base station or the relay; and
a receiver configured to receive an idle mode response message including paging information which comprises a paging group ID, a paging cycle, a paging listening interval, and a paging offset, and to receive a superframe including the paging message from the relay using the determined superframe number, the superframe having the superframe number staggered by the relay by a superframe number offset.