Elevator Machine and Drive System Electrical Knowhow. In the topic  Basic Elevator Components Part One , I indicate that the basic elevator components are as follows Car. Hoistway.  Machinedrive system. Control system.  Safety system. I explained the elevator car components in this prevouis topic, and I explained the Hoistway and its components in the topic Basic Elevator Components Part Two. I will continue explaining the third item from basic elevator components which is Machine Drive System as follows. You can review the following prevouis topics for more information and good following. Third Elevator Machine and drive system. Driving machine, this is the power unit of the elevator, and usually located at the elevator machine room. The Driving machine used to refer to the collection of components that raise or lower the elevator. These include the drive motor, brake, speed reduction unit, sheaves and encoders. Types of Driving Machines Generally, there are three standard types of driving machines provided for elevators. MITCalc Spur Gearing external internal Geometric design and strength check of spur gear with straight and helical toothing. Calculation of helical and. Worm Gear Design Calculation Pdf To Excel' title='Worm Gear Design Calculation Pdf To Excel' />Raising Fences Pdf lt Build A Building Steel Cheap Vinyl Sheds For Sale Build 2 Wooden Steps Without Stringer. Articles for design engineers and machinery manufacturers focusing on gears, bearings, motors, drives and motion control components. After North Korea threatened to launch an enveloping strike at Guam, the territorys office of civil defense posted emergency guidelines on Friday, explaining. It used in low and mid rise applications. This design utilizes a mechanical speed reduction gear set to reduce the rpm of the drive motor input speed to suit the. These are 1 Gearless Machine. It used in high rise applications whereby the drive motor and drive sheave are connected in line on a common shaft, without any mechanical speed reduction unit located between the drive motor and drive sheave. Generally, Gearless machines are used for high speed lifts between 2. Their sizes and shapes vary with load, speed and manufacture but the underlying principles and components are the same. The Gearless machines comprise the following components Electrical Motor. Traction Sheave or drum. Direct current armature in case of DC motor. Rotor in case of AC motor. Brake. Machine Bedplate. Supporting bearings. The Wonder Years Rapidshare on this page. Deflector or double warp sheave. Geared Machine It used in low and mid rise applications. This design utilizes a mechanical speed reduction gear set to reduce the rpm of the drive motor input speed to suit the required speed of the drive sheave and elevator output speed. Generally, geared machines are used for speeds between 0. Kg up to 5. 0,0. 00 Kg and above. Their sizes and shapes vary with load, speed and manufacture but the underlying principles and components are the same. Essentially, a geared machine includes the following components Drive motor. Brake. Speed reduction unit or gearbox. Drive sheave. Bedplate. Deflector sheave if mounted as integral part of the bedplate assembly. Types of geared machine drive according to location of installation A The drive machine located directly over top its hoistway or shaft is commonly referred to as Overhead traction as in the below image. B The drive machine located at a basement is commonly referred to as basement traction as in the below image. C The drive machine located at the side of the hoistway is commonly referred to as an offset traction. Note Basement and offset applications require additional deflector sheaves to properly lead suspension ropes off the drive sheave and to the car top or counterweight. Drum Machine It widely used in older passenger and freight elevator applications, though now rarely seen except for dumbwaiters. For many years now the Elevator Safety Code has disallowed the use of such machines for passenger applications. Tvs Thermal Printer Rp 3160 Driver there. A drum design has one end of the suspension rope affixed to the inside of the winding drums drive sheave, and then allows to rope to reel in or off the outer surface of its sheave, depending upon the car direction of travel. Elevator Machine Room for Electric Traction Type. Elevator Machine Room is Enclosure in which the machinery and electrical controls used for an elevator are contained. The room must be fully enclosed or otherwise secured against non authorized access. Usually located above the hoistway in a penthouse or two floors above the highest floor it serves, but may be in the basement if overhead space is unavailable. Within a typical machine room one will likely find the following Electrical Disconnects. Machine geared or gearless or drum type. Worm Gear Design Calculation Pdf To Excel' title='Worm Gear Design Calculation Pdf To Excel' />Machine brake. Drive motor. Encoder. Motor Generator Set. Selector. Car Controller Cabinet. Group Dispatcher or Common Relay Panel Cabinet. Car Governor. Counterweight Governor. Rope Gripper. Light fixtures and light control switch. Fire alarm devices. Hoist beam. Power receptacles. HVAC equipment used to service the elevator equipment room or space. Deflector Sheaves. Main Components of machine drive system 1 Electrical Motor Electrical Motor is used to raise and lower the elevator cab, the direction of motor rotation and speed revolutions per minute are directed and supervised by devices located within the elevator controller, The motor component of the elevator machine can be either a DC motor or an AC motor as follows A DC motor Direct current motors use carbon brushes to control or regulate the operational speed of its motor. It is an important maintenance task to regularly inspect, repair and replace these brushes. Failure to do so in a timely fashion can result in equipment mis operation and lead to significant motor damage. DC motors are as follows Has a good starting torque. Ease of speed control using a DC generator with a variable output or static converters. B AC motor The advantages of use AC motors are as follows More regularly used because of its ruggedness and simplicity. More ride quality. Types of Electrical Traction Drive Systems Generally, the electrical traction drive can be grouped into several categories based on the motor type and its control as follows A Geared traction control, which includes Single speed AC motor. Two speed AC motor. Variable voltage AC motor VVAC. Variable voltage, variable frequency AC motor VVVFAC. Variable voltage DC motorVVDC. B Gearless traction drives, which include Variable voltage DC motor VVDC. Variable voltage, variable frequency AC motorVVVFAC. Traction Drive Sheave The powered pulley connected to either the elevator drive motors outputshaft gearless or to the output side of the mechanical speed reduction unit geared. The circumference of the sheave has a series of U or V shaped grooves cut into it as shown in below image, in which sit the elevator suspension or hoist ropes. The friction loads created as the suspension ropes pass over the grooved surface of the sheave causes motion to be transmitted from the drive motor to the elevator cab or counterweight. Secondary Sheave Pulley that is normally used on gearless elevators and is located directly beneath the machine or drive sheave. It too has a grooved surface over which pass the suspension or hoist ropes. Deflector Sheave Pulley used to offset or direct the vertical drop or location of the steel hoist ropes running between the elevator car and its counterweight. Concise Historical Atlas more. Where the horizontal distance between the hitch point for the car and the counterweight is larger than the diameter of the drive sheave, one or more deflector sheaves are used to guide the hoist ropes. These devices are grooved sheaves that lead elevator suspension ropes off the drive sheave down to the car top and counterweight. The number and size of deflector sheaves will be a function of the elevators size, machine placement and roping arrangement. Many installations having carrying capacities of 1,1.