Energy storage and delivery system with an elevator lift system and method of operating the same
An energy storage and delivery system includes an elevator operable to move blocks from a lower elevation to a higher elevation to store energy and from a higher elevation to a lower elevation to generate electricity. A winch assembly is movably coupled to a cable that is coupled to the elevator. The winch assembly has planetary gear assemblies, brakes that selectively engage at least a portion of the planetary gear assemblies, and a spool coupled to the cable. A drive shaft extends between a motor-generator and the winch assembly. A brake is operable so that the spool rotates to reel-in the cable to raise the elevator to move a block from a lower elevation to a higher elevation to store energy or so that the spool rotates to reel-out the cable to lower the elevator to move a block from a higher elevation to a lower elevation to generate electricity.
1. An energy storage and delivery system, comprising:
a motor-generator;
an elevator shaft;
an elevator movably disposed in the elevator shaft, the elevator configured to support one or more blocks to move the one or more blocks along an elevator shaft; and
a winch assembly coupled to the motor-generator, the winch assembly comprising:
a plurality of planetary gears, the plurality of planetary gears comprising a first set of planetary gears and a second set of planetary gears;
one or more brake discs, wherein the one or more brake discs are coupled to the first set of planetary gears;
a plurality of brakes, the plurality of brakes comprising a first brake, a second brake, and a third brake;
a cable, wherein the cable is coupled to the elevator; and
a spool coupled to the cable, the spool being operable to reel in or reel out the cable;
wherein the first brake is operable to engage the one or more brake discs;
wherein the second brake is operable to engage the first set of planetary gears;
wherein the third brake is operable to engage the second set of planetary gears.
2. The energy storage and delivery system of claim 1 , wherein engagement of one or more of the first brake, the second brake, and the third brake and disengagement of one or more of the first brake, the second brake, and the third brake allows rotation of the spool in a first direction to lift the elevator, allows rotation of the spool in a second direction opposite the first direction to lower the elevator, or stops a rotation of the spool to thereby stop a movement of the elevator.
3. The energy storage and delivery system of claim 1 , wherein the first set of planetary gears comprises a first sun gear, a first pair of planet gears, and a first ring gear, and wherein the second set of planetary gears comprises a second sun gear, a second pair of planet gears, and a second ring gear.
4. The energy storage and delivery system of claim 3 , wherein the first pair of planet gears are arranged between the first sun gear and the first ring gear.
5. The energy storage and delivery system of claim 3 , wherein the second pair of planet gears are arranged between the second sun gear and the second ring gear.
6. The energy storage and delivery system of claim 3 , wherein the one or more brake discs are coupled to the first pair of planet gears so that the one or more brake discs rotate at the same speed as the first pair of planet gears.
7. The energy storage and delivery system of claim 3 , wherein the first ring gear is coupled to the second pair of planet gears so that the first ring gear rotates at the same speed as the second pair of planet gears.
8. The energy storage and delivery system of claim 1 , further comprising a drive shaft having an end coupled to the motor-generator and an opposite end coupled to the winch assembly.
9. The energy storage and delivery system of claim 8 , wherein the one or more brake discs are concentric with the drive shaft.
10. The energy storage and delivery system of claim 3 , wherein operating the first brake to disengage the one or more brake discs, operating the second brake to disengage the first ring gear of the first set of planetary gears, and operating the third brake to engage the second ring gear of the second set of planetary gears stops rotation of the spool.
11. The energy storage and delivery system of claim 3 , wherein operating the first brake to engage the one or more brake discs, operating the second brake to disengage the first ring gear of the first set of planetary gears, and operating the third brake to disengage the second ring gear of the second set of planetary gears allows a rotation of the spool in a reverse direction to reel-out the cable to lower the elevator.
12. The energy storage and delivery system of claim 3 , wherein operating the first brake to disengage the one or more brake discs, operating the second brake to engage the first ring gear of the first set of planetary gears, and operating the third brake to disengage the second ring gear of the second set of planetary gears allows rotation of the spool in a forward direction to reel-in the cable to raise the elevator.
13. The energy storage and delivery system of claim 1 , wherein one or more of the first brake, the second brake, and the third brake are hydraulically operated brakes.
14. The energy storage and delivery system of claim 1 , wherein one or more of the first brake, the second brake, and the third brake are pneumatically operated brakes.
15. The energy storage and delivery system of claim 1 , further comprising a damper coupled to the cable, the damper configured to absorb forces applied to the cable.
16. The energy storage and delivery system of claim 1 , further comprising a linear actuator coupled to the cable, the linear actuator configured to expand or contract to allow adjustment of a vertical position of the elevator to facilitate picking-up or dropping-off of the block.
17. The energy storage and delivery system of claim 1 , wherein the motor-generator is configured to output and receive power concurrently.
18. The energy storage and delivery system of claim 1 , wherein the motor-generator is coupled to one or more energy storage systems.
19. A method for storing and generating electricity comprising:
operating a motor-generator coupled to a drive shaft, the drive shaft being operably coupled to a winch assembly, the winch assembly operatively coupled to an elevator and comprising one or more sets of planetary gears, one or more brakes, one or more brake discs, a cable, and a spool,
wherein operating a motor generator to deliver power to a winch assembly includes:
operating a first brake to disengage one or more brake discs of the winch assembly, operating a second brake to engage a first ring gear of a first set of planetary gears and operating a third brake to disengage a second ring gear of a second set of planetary gears to rotate the spool in a first direction to reel-in the cable to raise the elevator,
wherein operating the motor-generator to generate power includes:
operating a first brake to engage one or more brake discs of the winch assembly, operating a second brake to disengage a first ring gear of a first set of planetary gears and operating a third brake to disengage a second ring gear of a second set of planetary gears to allow rotation of the spool in a second direction opposite the first direction to reel-out the cable to lower the elevator, the motor-generator generating power from said rotation of the spool in the second direction caused by the lowering of the elevator.
20. The method for storing and generating electricity of claim 19 , wherein operating a first brake of the winch assembly to disengage a brake disc of the winch assembly, operating a second brake of the winch assembly to disengage the first set of planetary gears, and operating a third brake of the winch assembly to engage the second set of planetary gears stops rotation of the spool.
21. The method for storing and generating electricity of claim 19 , wherein operating a motor-generator moves a plurality of blocks between a lower elevation and a higher elevation.