Slip Ring Motor For Bauxite Mining

Bauxite mining environments, centered around open-pit or underground mining, are characterized by high levels of dust and intense mechanical activity. Therefore, motor selection requires particular care.
Heavy equipment like conveyors and crushers in bauxite mines often experience heavy starting loads, low starting currents, and the need for speed regulation.
Slip ring motor for Bauxite mining address this pain point.

Compared to conventional squirrel-cage motors and variable-frequency motors, slip-ring motors offer significant advantages for heavy equipment in bauxite mines.

Compared with ordinary squirrel cage motors and variable frequency motors, slip ring motors have more prominent advantages in heavy equipment for bauxite mines.

Motor type Starting torque Starting current Speed ​​regulation capability Core issues in adapting to bauxite scenarios
Slip-ring motors large(1.5-2.5 times) Small (2-3 times) Gradual speed regulation (low cost) No obvious shortcomings, perfect match for heavy-load starting + speed regulation
ordinary squirrel cage motors Small (≤1.2 times) Large (5-7 times) NO Unable to start under heavy load, easy to trip
variable-frequency motors large Small Stepless speed regulation The cost is high, and the high dust and vibration in the mining area can easily cause inverter failure

We received an inquiry from a bauxite customer in May 2025.

Original Specifications:
Output: 336 kW / 450 HP0
Speed: 987/989revolutions per minute
Poles: 6P
Voltage: 400/440 V
Current: 580/550 A
Phases: 3
Frequency:60hz
Altitude: 1000 m
Insulation Class: F
Ambient Temperature: 40°C
Temperature Rise: 80K
KProtection Class: lP 44
Connection: Delta (A)
Rotor Data: 880/960 V,236/213
When communicating with the customer, they asked that the junction box method and rotor voltage and current be consistent because they did not want to replace the existing control system.

Milestone Motor's engineers held a brief meeting, carefully discussing slip ring motor for Bauxite mining and ultimately developing a solution that met them.
The drawings are as follows:

The customer was very satisfied after receiving the drawings and quote.
Their previous motors were manufactured in Europe, which was expensive and had long delivery times.
They have now replaced almost all of their mine's motors with Chinese-made motors.

The customer quickly reached a cooperation agreement with Milestone Motors, and after 50 days of production, the slip ring motor for Bauxite mining underwent load testing, with the following data.

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