M4Q045-BD01-01: The Industry Standard Q-Motor
The M4Q045-BD01-01 is a legendary square shaded-pole motor (Q-Motor) from ebm-papst, designed specifically for the refrigeration industry. With a stack size of 45mm, this 4-pole motor delivers a nominal output power of approximately 16 Watts. It is widely used to drive axial fan blades (typically 230mm to 300mm) in evaporators, condensing units, and commercial display coolers. Its simple, robust design—consisting of a stator, a squirrel-cage rotor, and sintered bronze bearings—makes it incredibly durable in harsh environments involving moisture and cold temperatures.
Key Technical Characteristics
- Motor Type: Square Shaded-Pole (Q-Motor).
- Voltage: 230 VAC (Single-phase).
- Output Power: 16 W.
- Speed: 1300 RPM (4-pole).
- Mounting: Standard 18mm / 26mm spacing (Foot or Grid mount).
- Protection: Impedance protected (Won’t burn out if rotor locks).
Maintenance & Field Replacement
Lifecycle State: Active. The universal spare part for supermarket fridges. Diagnosis: If the motor hums but doesn’t spin, the sintered bearings have likely dried out and seized. This is the most common failure mode after years of service. Unlike capacitor motors, Q-motors have low starting torque, so any friction stops them. Installation Tips: When installing a fan blade, ensure it is balanced. Use the correct pitch (typically 22° to 28°) to avoid overloading the 16W capacity. Compatibility: Compatible with all standard refrigeration controllers (e.g., Dixell, Carel, Danfoss). It can be switched directly via the compressor contactor or a fan relay. It works seamlessly in systems monitored by Siemens LOGO! for simple cold chain management.
| Feature | Spec |
|---|---|
| Current Draw | 0.25 A |
| Input Power | 60 W |
| Temp Range | -30°C to +40°C |
| Bearings | Calibrated Sintered Bronze |
Pro-Tip
The «Impedance Protection» means you don’t need an external thermal overload switch. The motor’s electrical resistance limits the current to a safe level even if the fan is blocked by ice.
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