El­e­va­tor In­dus­try’s Holy Grail

Con­sid­ered by many as the “Holy Grail” or the “Willy-wonka-lift,” thyssenkrupp MULTI en­ables el­e­va­tor cab­ins to move in shafts in the same way that trains move in rail sys­tems, with var­i­ous cab­ins per shaft and per­mit­ting ver­ti­cal as well as hor­i­zon­tal mo

Realty Plus - - Editor-In-Chief Note -

Most el­e­va­tors only move in ver­ti­cal shafts, with one el­e­va­tor per shaft. This lim­its the ca­pac­ity for mov­ing peo­ple in­spite of el­e­va­tors oc­cu­py­ing ex­ces­sive floor space in build­ings. In 2002, thyssenkrupp ad­dressed this is­sue with the TWIN el­e­va­tor sys­tem, of­fer­ing two cab­insper shaft and a 30% in­crease in trans­port ca­pac­ity as well as a re­duc­tion in the el­e­va­tor foot­print in build­ings by 30%.

TWIN el­e­va­tors were ad­vance­ment on sin­gle cabin sys­tems, im­prov­ing ca­pac­i­ties as well as op­er­a­tional ef­fi­ciency. How­ever, an in­crease in the num­ber of cab­ins in this sys­tem was re­stricted by the safety con­cerns, com­plex ca­ble ar­range­ments and the re­quire­ment for one car to al­ways be above the other. This is where lin­ear drives gain a sig­nif­i­cant ad­van­tage, elim­i­nat­ing the use of ropes and en­abling the use of more than one car in the same shaft.


Af­ter pre­sent­ing a 1:3 scale model at its In­no­va­tion Cen­ter in Spain, thyssenkrupp showed a fully func­tion­ing unit in­stalled in its new test tower in Rot­tweil, Ger­many. This process is sched­uled for com­ple­tion by around 2019/2020. A new lin­ear drive will en­able one sin­gle mo­tor to be suf­fi­cient to per­form hor­i­zon­tal and ver­ti­cal move­ments and an ex­changer will move cab­ins from one shaft to the other.

Op­er­at­ing on the ba­sic premise of a cir­cu­lar sys­tem, such as a pa­ter­nos­ter, MULTI will use ro­pe­less lin­ear tech­nol­ogy to op­er­ate el­e­va­tors and a sin­gle loop can in­cor­po­rate var­i­ous cab­ins. With a tar­geted speed of 5 m/s, the sys­tem will en­able near-con­stant ac­cess to an el­e­va­tor cabin every 15 to30 sec­onds, with a trans­fer stop every 50 me­ters. Pas­sen­gers will en­joy re­duced wait times and the op­tion of

dou­ble en­tries on the ground floor im­proves ease of ac­cess in large build­ings.

MULTI also of­fers much higher ca­pac­i­ties and faster and more com­fort­able move­ment as com­pared with high-speed el­e­va­tors, which are lim­ited by the ef­fects of pres­sure on the hu­man body, with many peo­ple ex­pe­ri­enc­ing dis­com­fort while trav­el­ling in el­e­va­tors at speeds higher than 10 m/s.

Although the ideal build­ing height for MULTI in­stal­la­tions starts at 300 me­ters this sys­tem is not con­strained by a build­ing’s height. With no ropes, a multi-level brake sys­tem, and wire­less power trans­fers from shaft to cabin, MULTI re­quires smaller shafts of a mere 6 square me­ters. This can sig­nify sig­nif­i­cant cost sav­ings for the build­ing’s de­vel­oper. The over­all in­crease in ef­fi­ciency also trans­lates into a re­duced need for el­e­va­tor shafts, thereby de­creas­ing a build­ing’s el­e­va­tor foot­print by up to 50% and pro­vid­ing fur­ther us­able floor space and rev­enues to build­ing own­ers.

thyssenkrupp’s lat­est of­fer­ing ‘Multi’ al­lows op­er­at­ing of mul­ti­ple el­e­va­tor cars in the same ver­ti­cal shaft as well as hor­i­zon­tal shaft chang­ing cabin sys­tem.

MULTI ap­plies the con­cept of the TWIN’S con­trol sys­tem and safety fea­tures but in­cludes new el­e­ments such light­weight car­bon com­pos­ite ma­te­ri­als for cab­ins and doors, weigh­ing amere 50 kg in­stead of 300 kg in stan­dard el­e­va­tors, re­sult­ing in an over­all 50% weight re­duc­tion as com­pared to stan­dard tech­nolo­gies.

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