An energy storage system is provided including: an elevator; an elevator motor; a power system coupled to the elevator motor. The power system including at least one capacitor operable to store energy received form the elevator motor and to supply stored energy to the elevator motor; and at least one flywheel operable to store energy received from the elevator motor and to supply stored energy to the elevator motor.

An elevator system includes an elevator car; a machine to impart force to the elevator car; a battery to power at least one of the machine and at least one load; and a power distributor to distribute power from the battery to the machine and the at least one load.

An intelligent elevator electronic unit having a central processor which both implements a motor control including time-critical motor control signals and performs basic functions of elevator operation, such as responding to external calls, specifying a travel curve or evaluating a safety circuit of the elevator system in which the elevator electronic unit is used to control an elevator motor. The elevator electronic unit also includes the power output stage required for operating the elevator motor and can also include one or more additional processors, with which the functionality of the elevator electronic unit is expandable in a modular manner. With this architecture, it is possible in particular to safely perform software updates of the central processor and/or an additional processor, to perform a downstream security check of such a software update or, for example, to autonomously optimize the operation of the elevator system with the aid of the central processor.

A method for determining a torque constant of a hoisting motor (302) of an elevator system (300). The method comprises performing (110) a roundtrip in an elevator shaft (340) by an elevator car (310) by utilizing the hoisting motor (302), wherein the roundtrip comprises a constant speed portion (21) in a first direction and a constant speed portion (22) in a opposite second direction. The method comprises determining (120) a motor current of the hoisting motor (302), such as recording samples thereof, during at least the constant speed portions, determining (130) a mean value of the motor current in the constant speed portions (21, 22), and determining (140) the torque constant based on the mean value, an elevator balance, and one or more mechanical parameters related to a force transmission between the hoisting motor (302) and the elevator car (310). An elevator system (300), an elevator control unit (1000), and a computer-readable memory medium are also disclosed.

A control system for safe torque off (STO) operation is provided, including a motor, a digital signal processor (DSP) which outputs three-phase low side pulse width modulation (PWM) signals and three-phase high side PWM signals, an inverter receptive of the three-phase low side PWM signals and the three-phase high side PWM signals, the inverter being configured to combine the three-phase low side PWM signals and the three-phase high side PWM signals into a three-phase high-voltage output to control the motor, and a digital isolator electrically interposed between the DSP and the inverter and configured to selectively block at least a portion of the three-phase high side PWM signals from being received by the inverter.

A rail-mounted lift system includes a conductive rail electrically coupled to a power source; and a lift unit supported by the conductive rail, the lift unit comprising a battery and a switch for selectively coupling the battery to the power source via the conductive rail, the lift unit being configured to: determine a state of charge of the battery, determine a selected charge profile, and actuate the switch to supply power from the power source based on the state of charge and the selected charge profile.

An elevator system drive includes: an electric machine: a first converter electrically connected to an alternating current source and the electric machine: a drive controller controlling the drive: a drive safety circuit unit electrically connected to a safety circuit of the elevator system, to a controller of the elevator system, and to the drive controller; and at least one mechanical brake that is closed by a brake closing command from the elevator system controller. The drive safety circuit unit operates in a first operating state wherein it transmits an emergency stop command coming from the elevator system safety circuit directly and without delay to the first converter, and operates in a second operating state wherein it relays a modified emergency stop command coming from the elevator system safety circuit, with a delay, to the first converter to ensure safe braking of the elevator system even if the mechanical brakes fail.

A safety torque off (STO) device interrupts torque generation by an elevator installation drive machine supplied by a power supply device being part of an inverter device, for example. The STO device includes a control input, signal input terminals connected to signal generation device outputs and signal output terminals connected to driver circuit inputs. Each of the STO signal input terminals is electrically connected to an associated one of the signal generation device outputs via first and second signal transmission switches connected in series. The control input is connected to first and second control units, wherein the first control unit, controlled by a control signal applied to the control input, switches switching states of all the first signal transmission switches and the second control unit, controlled by a control signal applied to the control input, switches switching states of all of the second signal transmission switches.