Patent ID: 7264087

Claim:
Method of controlling a counterweightless elevator system provided with an elevator car and a variable speed drive with an electric motor, wherein the elevator car load is weighed, and wherein the elevator system is controlled in order to reduce the physical/electrical dimensions of the system, the method defining the total mass of the elevator by an equation Mtotal=Mcar (mass of the car)+A*Maxpayload, wherein Mcar is the mass of the car, A is a coefficient and Maxpayload is the maximal payload, and that if the payload fails to supercede A*Maxpayload, controlling the elevator to have a predetermined idle time of the elevator and a predetermined speed and a predetermined acceleration of the motor; and if the payload supercedes A*Maxpayload, controlling the elevator so that at least one of the idle time of the elevator is increased, and at least one of the speed and acceleration of the motor is reduced.