900kW Wound Rotor Motor

1.Overview:
The 900kW wound rotor motor is part of the YR series-these are high-voltage three-phase asynchronous motors, after all. It's built specifically for heavy-duty industrial jobs. We're talking about the kind of work where you need to power big, tough machines-like the ones used in factories or mines that move heavy loads or run nonstop under tough conditions. It's designed to handle the "heavy lifting" of industrial drive needs. In terms of motor classification, it belongs to the "wound rotor subtype" under "high-voltage three-phase asynchronous motors" and differs significantly from the more common squirrel-cage high-voltage motors in core structure and performance focus.
A key feature of this motor lies in its "wound rotor" structure: unlike the closed circuit composed of cast aluminum bars and end rings in squirrel-cage motors, its rotor uses windings made of enameled wire, with both ends of the windings led out to a slip ring device outside the motor. Through this structure, resistors or specialized speed control equipment can be connected in series in the rotor circuit.Here are some additional data points:

2.Core Features
The 900kW wound rotor motor offers significant advantages in many aspects.
Excellent heavy-load starting performance. The wound rotor structure can control starting current to 2.5-3.5 times the rated current (significantly lower than the 5-7 times typical for squirrel-cage high-voltage motors) by connecting series resistors or frequency-sensitive resistors to the rotor. while achieving a starting torque of 1.8-2.5 times the rated torque. This enables smooth operation of stationary or heavy-load starting equipment like crushers and hoists, preventing impact on the power grid and mechanical transmission systems during startup.
This motor stands out for its strong ability to handle load impacts and overloads. Let's break down how it achieves that:
First, the stator windings use vacuum pressure impregnation (VPI) technology. This process makes the insulation layer dense-so it's much better at resisting high-voltage breakdown and doesn't age easily from heat. Then, the slip rings are made of copper alloy and have a sealed dust-proof design. This cuts down on wear to the carbon brushes and lowers the chance of contact failures, which helps keep the motor running smoothly.
The bearing system is tough too. It can handle short-term overloads-like running at 1.2 times the rated load for an hour-and it also stands up to regular impact loads. This toughness means the motor works well in the changing conditions you often see in heavy industry. For example, when the load suddenly gets heavier during ore crushing, or when the torque goes up and down off and on during hoisting work, the motor can keep up without issues.
Highly adaptable.In terms of installation, the motor's dimensions strictly comply with IEC standards. This means it can directly replace high-voltage wound rotor motors of the same specifications from both domestic and international manufacturers-there's no need to modify the original installation foundation or connecting components, greatly reducing replacement costs and downtime for equipment upgrades or maintenance.

3.Scope of Application
Boasting strong heavy-load starting capability and impact resistance, the 900kW wound rotor motor is mainly suitable for heavy industrial scenarios that demand high-torque drives. Specific application scenarios are as follows:
a.Mining and Coal Industry: It is used to drive mining hoists (for vertical/inclined shaft ore and personnel hoisting), crushers (jaw crushers and cone crushers), ball mills (for ore grinding), and scraper conveyors (for underground or surface coal transportation). These pieces of equipment must be able to withstand static loads during startup and impact loads during operation.
b.Metallurgical Industry: It is applied to auxiliary drive equipment of rolling mills (such as roller tables and coilers), blast furnace fans (combustion fans and dust extraction fans), and converter oxygen lance lifting mechanisms. These devices need to meet the requirements of frequent start-stop cycles and short-term overload conditions.
c. Power Industry In the power industry: This motor is mainly used for auxiliary equipment in thermal power plants-specifically things like induction fans, forced draft fans, and coal pulverizer exhaust fans. It's also used for gate hoists in hydroelectric power stations. For these setups, two key requirements matter most: first, the equipment has to run continuously for long periods (no frequent shutdowns), and second, it needs to handle the occasional fluctuations in grid voltage without breaking down.
d. Chemical and Petrochemical Industry: Here, the motor is used to drive large centrifugal compressors (which move process gases around) and high pressure pumps (that transport crude oil or chemical media). The conditions here are a bit harsher, so the motor needs to stand up to corrosive environments-if needed, you can also add anti-corrosion coatings to it.

4.Operating environment:
Please refer to the information below for the operating environment.

5.Model Description
Taking YR5004-6 as an example,explain the model designation of the 900kW wound rotor motor.

6.Order Instructions
Please indicate the following information when placing your order:

7.Catalogue
Some of the parameters are as follows:

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