Technical Specifications:

• Frame Size: 170 (IEC 60034-7)
• Model Designation: BDM-344-00
• Number of Poles: 4 poles
• Rated Power: 15 kW (20 HP)
• Rated Voltage: 400V AC, 50 Hz (Delta) / 690V AC, 50 Hz (Star)
• Rated Current (Delta): 29.5 A
• Rated Current (Star): 17.0 A
• Rated Speed: 1450 rpm (50 Hz) / 1740 rpm (60 Hz)
• Efficiency Class: IE3 (Premium Efficiency, per IEC 60034-30-1)
• Power Factor (cos φ): 0.87
• Insulation Class: F (155°C max winding temperature)
• Protection Class: IP55 (totally enclosed, fan-cooled — TEFC)
• Mounting Type: B3 (foot-mounted, flange-less)
• Ambient Temperature: -15°C to +40°C
• Duty Cycle: S1 (continuous running)
• Bearing Type: Deep groove ball bearings (6205-2RS front, 6204-2RS rear)
• Weight: Approx. 85 kg
• Standards Compliance: IEC 60034-1, IEC 60034-7, IEC 60034-30-1, EN 60034

Functional Features:

• IE3 Premium Efficiency: Reduces energy consumption by up to 20% compared to IE1 motors.
• High starting torque: 2.2× rated torque for heavy-load start-up.
• Low vibration design: Dynamic balancing to G6.3 grade (ISO 1940-1).
• Thermal protection: PTC thermistors embedded in stator windings with external thermal relay connection.
• Reversible rotation: Achievable by swapping U and V phase connections at the terminal box.
• Service factor: 1.15 — allows temporary overload up to 17.25 kW.

Material Composition:

• Stator Frame: Grey cast iron (EN-GJL-250)
• Stator Laminations: Silicon steel sheet, 0.5 mm, M5 grade (grain-oriented)
• Rotor: Die-cast aluminum (AlSi9Cu3), dynamically balanced
• Shaft: C45 carbon steel, keyed (DIN 6885)
• Windings: Class F enamel-coated copper wire (180°C thermal class)
• Terminal Box: Glass-fiber reinforced polyester (GRP), IP55 rated
• Bearings: SKF or FAG branded, 2RS sealed
• Fan Cover: Sheet steel, powder-coated RAL 5010 (gentian blue)

Structural Features:

• B3 foot mounting with 4 mounting feet and M12 bolt holes.
• Top-mounted terminal box with 6-pin connection block (U1, V1, W1, U2, V2, W2, PE).
• Rear fan cover with aluminum fan blades for TEFC cooling.
• Lifting eye bolt on top cover (M10) for safe handling.
• Drain plug on frame bottom (M16 × 1.5) for condensation drainage.

Working Principle:
Three-phase AC power applied to the stator windings creates a rotating magnetic field at synchronous speed (1500 rpm for 4-pole, 50 Hz). This rotating field induces current in the aluminum rotor bars (Faraday’s law), producing a secondary magnetic field. The interaction between the stator and rotor fields generates electromagnetic torque, causing the rotor to turn at 1450 rpm (50 Hz) — a slip of approximately 3.3%. The fan mounted on the rear shaft forces ambient air over the ribbed frame for cooling. PTC thermistors monitor winding temperature; if temperature exceeds 155°C, the external thermal relay opens the control circuit to protect the motor.

Advantages & Highlights:

• IE3 efficiency delivers significant energy savings in continuous-duty applications.
• IP55 protection allows use in dusty and wet industrial environments.
• 85 kg robust construction with cast iron frame ensures long service life.
• IE3 motors qualify for EU Ecodesign compliance (mandatory since 2017 for 0.75–375 kW range).

Applicable Industries / Use Cases:

• Water and wastewater treatment plants (pump drives)
• HVAC systems (fan and blower drives)
• Manufacturing and production lines (conveyors, mixers)
• Mining and quarrying
• Food and beverage processing

Installation Requirements:

• Mount on a rigid, level foundation using M12 anchor bolts through the 4 feet.
• Connect to a VFD (Variable Frequency Drive) for speed control applications.
• Ensure adequate ventilation clearance: Minimum 300 mm on all sides for airflow.
• Connect protective earth (PE) to the motor frame earthing terminal.
• Use flexible coupling between motor shaft and driven equipment to absorb misalignment.
• Align shaft to within 0.05 mm radial and 0.05 mm/100 mm angular tolerance.

Usage Precautions:

• Do not operate the motor below 20% of rated load for extended periods (overheating risk).
• Check bearing temperature regularly; maximum allowable is 95°C (housing).
• Lubricate bearings per manufacturer schedule (typically every 8,000–12,000 hours for sealed units).
• Ensure voltage unbalance does not exceed 2% — unbalanced voltage causes excessive heating.
• Store in a dry, ventilated warehouse; use space heaters if ambient drops below 0°C to prevent condensation.