Lift Drives - IMechE

1Only for circulation in lectures

Lift Drives

IMechE CPD Certificate Course5 Dec, 2016


• Definition of a Lift - according to Cap 618, it means a

lifting machine or appliance having a carrier the

direction of movement of which is restricted by one or

more guides, or a mechanized vehicle parking system,

but does not include an escalator.

• Definition of Escalator – an inclined, continuous

stairway that is driven by mechanical power and is

used for (i) raising passengers; (ii) lowering

passengers; or (iii) both of the purposes mentioned

above; a passenger conveyor that is a continuous

walkway driven by mechanical power and is used for

conveying passengers on the same or between different

traffic levels.

Definitions


Types

Lifts– Traction

• gearless � medium to high speed passenger

(1.5 m/s up)

• geared � low speed passenger (below 1.5 m/s)

– Hydraulic ( 1 m/s or below)

• plunger

• roped


Types of Lifts:

• Traction (Geared/Gearless)

• Hydraulic

Types of Drives:

• AC2 (AC 2-speed)

• ACVV (AC Variable Voltage)

• ACVVVF (AC Variable Voltage Variable

Frequency)

• DCWL (DC Ward Leonard)

• DCTL (DC Thyristor Leonard)



Ideal Speed Profile of a Lift

3

3

2

2

dt

xd

dt

daj

dt

xd

dt

dva

dt

dxv

==

==

=


Roping

Systems




Most

common

motors

used in

elevator

systems



Torque Speed Curve of a standard Induction Machine



ACVV

Control


ACVVVF Torque Speed Curves



Control Block Diagram of AC VVVF Scalar


Torque Speed Curves of ACVVVF Scalar Control


Machine Roomless Lifts




Mitsubishi Ropeless Elevator


Otis

Odyssey


ThyssenKrupp MULTI


ThyssenKrupp

Twin Lifts


My Research at PolyU


END

Lift Drives - IMechE

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