Patent ID: 8602170

Claim:
An elevator drive for driving and holding an elevator car, comprising: a traction wheel for providing a driving force and a holding force for the elevator car; a motor for driving said traction wheel; a brake arrangement for holding said traction wheel; a drive shaft connecting said traction wheel, said motor and said brake arrangement together, wherein the said arrangement further comprises at least two brake devices, wherein said traction wheel is arranged between said at least two brake devices and wherein said at least two brake devices are arranged on opposite sides of said traction wheel on said drive shaft; and a monitoring logic system for ascertaining whether one of said at least two brake devices alone can maintain the elevator car at standstill, wherein when said at least two brake devices are activated to hold said traction wheel and one of said at least two brake devices is briefly released, said monitoring logic system ascertains during a time in which the one of said at least two brake devices is released whether another one of said at least two brake devices alone can maintain the elevator car at standstill, wherein the monitoring logic system issues a possible item of fault information to an elevator control on the basis thereof, the elevator control either applying the first one of the at least two brake devices or releasing the another one of the at least two brake devices.