An elevator drive unit includes a drive shaft having at least one drive section for driving a drive belt. The drive unit also includes an electromotor, for driving the drive shaft having a stator and a rotor, a brake for braking the drive shaft, and a frame for supporting the drive shaft, the stator and the brake.

A machine assembly for use in an elevator system is provided including a drive sheave (52) configured to rotate about a first axis of rotation (R). A first roller shaft (54) is configured to rotate about a second axis of rotation (S) substantially parallel to the first axis of rotation. Rotation of the first roller shaft about the second axis of rotation is configured to rotate the drive sheave about the first axis of rotation. A first motor is operably coupled to the first roller shaft and is configured to rotate the first roller shaft about the second axis of rotation.

A machine assembly for use in an elevator system is provided including a drive sheave (52) configured to rotate about a first axis of rotation (R). A first roller shaft (54) is configured to rotate about a second axis of rotation (S) substantially parallel to the first axis of rotation. Rotation of the first roller shaft about the second axis of rotation is configured to rotate the drive sheave about the first axis of rotation. A first motor is operably coupled to the first roller shaft and is configured to rotate the first roller shaft about the second axis of rotation.

An elevator system includes an elevator car. A first drive assembly engages a first tension member. The first tension member is coupled to the elevator car and to a first counterweight. A second drive assembly engages a second tension member. The second tension member is coupled to the elevator car and to a second counterweight. The first tension member can be coupled to the elevator car at a first position and the second tension member can be coupled to the elevator car at a second position opposite the first position.

An elevator system includes an elevator car. A first drive assembly engages a first tension member. The first tension member is coupled to the elevator car and to a first counterweight. A second drive assembly engages a second tension member. The second tension member is coupled to the elevator car and to a second counterweight. The first tension member can be coupled to the elevator car at a first position and the second tension member can be coupled to the elevator car at a second position opposite the first position.

An elevator installation and a method of operating the elevator system for temporary transportation of an overload within the elevator installation includes a car and a counterweight interconnected by one or more suspension ropes engaging a traction sheave that is driven by a motor. The traction between the suspension ropes and the traction sheave is enhanced independently of the counterweight for intended overload operation.

An elevator installation and a method of operating the elevator system for temporary transportation of an overload within the elevator installation includes a car and a counterweight interconnected by one or more suspension ropes engaging a traction sheave that is driven by a motor. The traction between the suspension ropes and the traction sheave is enhanced independently of the counterweight for intended overload operation.

The present utility model provides a traction sheave, including: a traction sheave body, formed of several arc-shaped traction sheave sections that are connected to each other; and connecting portions, disposed at two ends of each traction sheave section along a lateral surface of the traction sheave section, where the connecting portions at the two ends of each traction sheave section fit each other. The traction sheave according to the present utility model has relatively high replaceability, is very convenient to assemble and disassemble, requires relatively low costs of human and material resources and time, and meanwhile can still ensure high reliability of working of the traction sheave.

The present utility model provides a traction sheave, including: a traction sheave body, formed of several arc-shaped traction sheave sections that are connected to each other; and connecting portions, disposed at two ends of each traction sheave section along a lateral surface of the traction sheave section, where the connecting portions at the two ends of each traction sheave section fit each other. The traction sheave according to the present utility model has relatively high replaceability, is very convenient to assemble and disassemble, requires relatively low costs of human and material resources and time, and meanwhile can still ensure high reliability of working of the traction sheave.

A method is disclosed of retrofitting an elevator machine with primary and secondary braking, the machine being disposed on a machine support frame in an elevator machine room, and engaging one or more ropes for providing selective movement of an elevator car disposed in an elevator shaft, the machine having a drive sheave including a cylindrical brake drum, and brake components including dual brake arms; the method including: removing the brake components; affixing flanged disc segments about the drum and interlocking the flanged disc segments to form a brake rotor; and mounting respective brake calipers to frame mounts for providing primary and secondary braking to the elevator machine.