Schorch High-Voltage Motor 1680 kW (KV6535B-AA06)

Overview

The Schorch KV6535B-AA06 is a three-phase high-voltage asynchronous (induction) motor manufactured by ATB Schorch GmbH, Mönchengladbach, Germany. The unit is listed with a rated output of 1680 kW at 6.6 kV, 175 A and 995 rpm, which corresponds to a 6-pole machine on a 50 Hz supply.

The motor belongs to the Schorch KV series of modular-construction high-voltage motors for safe (non-hazardous) areas. The KV family covers 160 to 17,000 kW, shaft heights 400 to 1,200 and 2 to 24 poles, for direct-on-line or frequency-converter operation. Motors of this size are used as prime movers for large compressors, pumps, fans and mills.

Key Features

• Rated output 1680 kW at 6.6 kV, 175 A, 995 rpm
• KV modular series for safe areas, 160 to 17,000 kW across the range
• Suitable for mains (direct-on-line) or frequency-converter operation
• Fabricated steel frame, rolling or sleeve bearings depending on design
• Insulation class 155 (F) utilised to 130 (B)
• Cooling method IC611, enclosure IP55 or IP65

Technical Specifications

Applications

Drive of large centrifugal and reciprocating compressors, process and water-injection pumps, induced- and forced-draft fans, and mills in oil and gas, petrochemical, power generation, desalination and water transmission plants. Exact duty, cooling and bearing arrangement must match the driven equipment and site conditions.

Why Seven Star LLC

Seven Star LLC supplies Schorch high-voltage motors and spares to industrial users across Oman and the GCC. Before quoting, we check the full nameplate data (type code, serial number, voltage, speed, frame and bearing design) against the existing installation so that the replacement matches the driven equipment.

Also available: SKF 6206-2RS1 Deep Groove Ball Bearing

Request a Quote for Schorch High-Voltage Motor 1680 kW (KV6535B-AA06)

Send the motor nameplate details or a nameplate photo (type code KV6535B-AA06, serial number), the required quantity, supply configuration (direct-on-line or VFD) and the driven equipment type through our Inquiry Form. We will confirm availability and respond with a formal quotation.

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How the Schorch KV6535B-AA06 High-Voltage Motor Works

The Schorch KV6535B-AA06 is a squirrel-cage asynchronous machine. The three-phase stator winding, fed at 6.6 kV, creates a magnetic field that rotates at synchronous speed, which for a 6-pole machine on a 50 Hz network is 1,000 rpm. The field induces currents in the rotor cage bars, and the interaction of these currents with the stator field produces torque. The rotor runs slightly slower than the field; the difference, called slip, is what allows torque to be produced, and the listed rated speed of 995 rpm shows that this motor operates with a very small slip at full load, which is typical for large high-voltage machines with high efficiency.

At this power level the starting method has a major effect on the electrical network and on the driven equipment. Direct-on-line starting draws a high inrush current for a short time and gives a high starting torque, while starting through a frequency converter, soft starter or autotransformer limits the current and the mechanical stress on couplings and gearboxes. The KV series is designed for both mains and converter operation, but the exact variant, insulation system and bearing insulation must suit the chosen supply.

Cooling and Construction

The KV6535B-AA06 belongs to a modular range in which the frame, cooling arrangement and bearings are selected to suit the application. The listed cooling method IC611 describes a machine with an air-to-air heat exchanger mounted on the motor: internal air circulates through the active parts and the heat exchanger tubes, while a separate external fan drives ambient air through the tubes. The two air circuits remain separate, which keeps dust, sand and moisture away from the windings. This is a useful feature for installations in the Gulf region, where high ambient temperatures and airborne dust are normal. Insulation class 155 (F) utilised only to class 130 (B) temperature rise gives a thermal reserve that supports long winding life.

Schorch KV6535B-AA06 Selection and Replacement Guide

When a high-voltage motor of this size is replaced or a spare is ordered, a matching type code alone is not enough. Large motors are often built to project specifications, so the following data should be checked against the existing nameplate and drawings:

• Rated voltage, frequency, power, current and speed (6.6 kV, 1680 kW, 175 A, 995 rpm for this listing).
• Mounting arrangement and shaft height, shaft end dimensions and direction of rotation.
• Bearing type (rolling or sleeve), lubrication system and bearing insulation for converter duty.
• Terminal box position, cable entry and the arrangement of auxiliary boxes for space heaters, winding RTDs and bearing temperature sensors.
• Cooling method, degree of protection and any hazardous-area or project-specific requirements.
• Starting method and the torque curve of the driven compressor, pump or fan.

Installation and Maintenance of High-Voltage Motors

A motor of this rating should be installed on a rigid, level foundation, and the coupling should be aligned with laser alignment equipment after the foundation bolts are tightened and again after the first operating period. Before energising, measure the insulation resistance and polarisation index of the stator winding, especially if the motor has been stored for a long time or exposed to humidity. Space heaters should be kept switched on while the motor is stopped to prevent condensation inside the frame.

In service, a condition-monitoring programme typically covers bearing vibration, bearing and winding temperatures, partial discharge or insulation tests during outages, and inspection of the heat exchanger tubes and fans for fouling. Bearing lubrication intervals and grease or oil quality must follow the manufacturer’s maintenance manual for the specific motor.

Typical Applications in Oman and the GCC

Schorch high-voltage motors are used throughout the region in oil and gas production, gas processing, refineries, petrochemical plants, power stations, desalination plants and water transmission pumping stations. Typical driven loads for a 1680 kW, 6-pole machine include large centrifugal pumps, process compressors, induced-draft and forced-draft fans and mills.

Why Source the Schorch KV6535B-AA06 from Seven Star LLC

Seven Star LLC supplies Schorch high-voltage motors and related spares to industrial customers across Oman and the GCC. Request a quote with the full nameplate data, and our team can help confirm the correct ordering code and the technical details that must match your existing installation.