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 assembly for use in an energy storage and delivery system, comprising:
a planetary gear assembly including a first set of planetary gears and a second set of planetary gears, the second set of planetary gears disposed axially between the first set of planetary gears and a cable, the first set of planetary gears including a first sun gear, a first pair of planet gears, and a first ring gear, the second set of planetary gears including a second sun gear, a second pair of planet gears, and a second ring gear;
a brake disc coupled to the first set of planetary gears; and
a plurality of brakes including a first brake operable to engage the brake disc, a second brake operable to engage the first set of planetary gears, and a third brake operable to engage the second set of planetary gears;
wherein operating the first brake to disengage the brake disc, operating the second brake to engage the first ring gear, and operating the third brake to disengage the second ring gear allows the cable to move in a first direction; and
wherein operating the first brake to engage the brake disc, operating the second brake to disengage the first ring gear, and operating the third brake to disengage the second ring gear allows the cable to move in a second direction opposite the first direction.
2 . The assembly of claim 1 , wherein operating the first brake to disengage the brake disc, operating the second brake to disengage the first ring gear, and operating the third brake to engage the second ring gear stops the cable from moving in the first direction or the second direction.
3 . The assembly of claim 1 , wherein the first pair of planet gears are arranged between the first sun gear and the first ring gear.
4 . The assembly of claim 1 , wherein the second pair of planet gears are arranged between the second sun gear and the second ring gear.
5 . The assembly of claim 1 , wherein the brake disc is coupled to the first pair of planet gears so that the brake disc rotates at a same speed as the first pair of planet gears.
6 . The assembly of claim 1 , wherein the first ring gear is coupled to the second pair of planet gears so that the first ring gear rotates at a same speed as the second pair of planet gears.
7 . The assembly of claim 1 , further comprising a drive shaft having an end coupled to a motor-generator, the motor-generator operable to deliver energy to a power grid.
8 . The assembly of claim 7 , wherein the brake disc is concentric with the drive shaft.
9 . The assembly of claim 1 , wherein one or more of the first brake, the second brake, and the third brake are pneumatically operated brakes.
10 . The assembly of claim 1 , further comprising a damper coupled to the cable, the damper configured to absorb forces applied to the cable.
11 . The assembly of claim 1 , further comprising a motor-generator, an elevator shaft, and an elevator movably disposed in the elevator shaft, the elevator configured to support one or more blocks.
12 . An assembly for use in an energy storage and delivery system, comprising:
a planetary gear assembly including a first set of planetary gears and a second set of planetary gears, the second set of planetary gears disposed axially between the first set of planetary gears and a cable, the first set of planetary gears including a first sun gear, a first pair of planet gears, and a first ring gear, the second set of planetary gears including a second sun gear, a second pair of planet gears, and a second ring gear;
a brake disc coupled to the first set of planetary gears; and
a plurality of brakes including a first brake operable to engage the brake disc, a second brake operable to engage the first set of planetary gears, and a third brake operable to engage the second set of planetary gears;
wherein translation of the cable in a first direction lifts one or more blocks from a lower elevation to a higher elevation to store energy; and
wherein translation of the cable in a second direction opposite the first direction lowers the one or more blocks from a higher elevation to a lower elevation to generate energy.
13 . The assembly of claim 12 , 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 movement of the cable in the first direction, allows movement of the cable in the second direction opposite the first direction, or stops a movement of the cable.
14 . The assembly of claim 12 , wherein operating the first brake to disengage the brake disc, operating the second brake to disengage the first ring gear, and operating the third brake to engage the second ring gear stops movement of the cable.
15 . The assembly of claim 12 , further comprising a drive shaft having an end coupled to a motor-generator.
16 . The assembly of claim 15 , wherein the motor-generator is configured to output and receive power concurrently.
17 . The assembly of claim 12 , wherein the first ring gear is coupled to the second pair of planet gears so that the first ring gear rotates at a same speed as the second pair of planet gears.
18 . An assembly for use in an energy storage and delivery system, comprising:
a planetary gear assembly including a first set of planetary gears and a second set of planetary gears, the second set of planetary gears disposed axially between the first set of planetary gears and a cable, the first set of planetary gears including a first sun gear, a first pair of planet gears, and a first ring gear, the second set of planetary gears including a second sun gear, a second pair of planet gears, and a second ring gear;
a brake disc coupled to the first set of planetary gears; and
a plurality of brakes including a first brake operable to engage the brake disc, a second brake operable to engage the first set of planetary gears, and a third brake operable to engage the second set of planetary gears.
19 . The assembly of claim 18 , further comprising a drive shaft having an end coupled to a motor-generator.
20 . The assembly of claim 19 , wherein the motor-generator is configured to output and receive power concurrently.