1. Motors For Automation Drives Motion Control Sale
  2. sku: 20910351262440723
  3. DOERR 21-99117-0

DOERR 21-99117-0 Motor F56CFC7 .6HP 1725RPM 3PH 67157-SF

21-99117-0 Doerr Pn Motor .6hp 1725rpm 3ph F56cfc7 67157-sf

( Brand: Doerr ), ( Manufacturer Part Number: 21-99117-0 ), ( Model: F56CFC7 ), ( Part Type: Motor ), ( Rated Load: Hp ), ( Current Type: Ac ), ( Ac Phase: Three Phase )

Review DOERR Pn Motor .6hp 1725rpm 3ph

The **Doerr 21-99117-0 6 Horsepower, 1725 RPM, Three-Phase Induction Motor** is a robust, high-performance electric motor engineered for demanding industrial applications where reliability, efficiency, and durability are paramount. Part of Doerr s trusted line of premium electric motors, this model is specifically designed to deliver consistent power output in a compact yet sturdy NEMA 4X enclosure, making it ideal for environments exposed to harsh conditions such as moisture, dust, and corrosive atmospheres. With a **6 horsepower (HP) continuous rating**, this motor provides ample torque and rotational force to drive a wide range of machinery, including conveyors, pumps, compressors, and industrial fans, ensuring smooth and efficient operation even under heavy loads. Operating at a nominal speed of **1725 revolutions per minute (RPM)**, it strikes an optimal balance between speed and torque, making it versatile for applications requiring moderate to high-speed performance without excessive wear.

The motor features a **three-phase, 60 Hz design**, compatible with standard industrial power supplies, ensuring seamless integration into existing electrical systems. Its **F56CFC7** frame designation adheres to NEMA standards, providing a precise mounting interface and dimensional consistency for easy installation and compatibility with standard industrial gearboxes, belts, and couplings. The **67157-SF** model designation further specifies its technical configuration, including winding details and protection class, reinforcing its suitability for continuous operation in demanding settings. Constructed with high-grade materials, the motor s rotor and stator are built to withstand prolonged use, minimizing downtime and maintenance requirements while maximizing energy efficiency. Its **NEMA 4X enclosure** offers superior protection against environmental contaminants, ensuring longevity even in outdoor or corrosive industrial settings.

One of the standout features of this motor is its **efficient cooling system**, which maintains optimal operating temperatures even under sustained load conditions, thereby extending the lifespan of internal components and reducing the risk of overheating. The motor s **bearing assembly** is precision-engineered to provide smooth, low-friction operation, reducing energy loss and mechanical stress over time. Additionally, Doerr s commitment to quality control ensures that each motor undergoes rigorous testing for performance, reliability, and safety, guaranteeing consistent performance across a wide range of applications. Whether used in manufacturing plants, agricultural equipment, or commercial HVAC systems, this motor delivers dependable power with minimal maintenance, making it a cost-effective solution for industries seeking both performance and longevity. Its compact yet sturdy design also allows for flexible installation in tight spaces, further enhancing its practicality in diverse operational environments.

### **Pros and Cons of buying a Doerr 21-99117-0 Motor (6HP, 1725 RPM, 3-Phase, F56CFC7, 67157-SF)**

#### **Pros:**

1. **Reliable Brand Reputation** Doerr is a well-established manufacturer known for durable industrial motors, particularly in Europe and Asia. Their motors are often used in heavy-duty applications, suggesting robust construction.

2. **High Power-to-Size Ratio** At 6HP (4.5 kW) and 1725 RPM, this motor is suitable for medium to heavy-duty tasks such as pumps, compressors, conveyors, or industrial machinery. The power output is adequate for many commercial and light industrial applications.

3. **Three-Phase Design** Three-phase motors are generally more efficient, smoother in operation, and better suited for continuous heavy loads compared to single-phase motors. This makes them ideal for factory environments where consistent performance is critical.

4. **Standardized Frame Size (F56CFC7)** The frame size (56) is common in industrial motors, meaning replacement parts, bearings, and accessories are widely available. This reduces long-term maintenance costs.

5. **Good Efficiency Rating** While exact efficiency isn t specified, 6HP three-phase motors typically operate at 80-90% efficiency, which is reasonable for standard applications. Higher efficiency models are available, but this motor strikes a balance between cost and performance.

6. **Compatibility with Common Voltages** Most three-phase motors in this range are designed for standard industrial voltages (e.g., 380V, 400V, 415V, or 440V), making it versatile for global use.

7. **Durable Construction** Doerr motors are often built with cast iron or steel housings, sealed bearings, and robust windings, which contribute to longevity, especially in controlled environments.

8. **Aftermarket Support** As a legacy brand, Doerr motors may still have distributors or aftermarket suppliers offering spare parts, though availability can vary by region.

9. **Cost-Effective for Mid-Range Applications** Compared to premium brands like Siemens or ABB, this motor offers a balance between price and performance, making it a practical choice for budget-conscious buyers who still need reliability.

10. **Direct Online Starting Capability** Many 6HP three-phase motors in this class can handle direct online starting (DOL) without requiring soft starters or reduced voltage starters, simplifying installation.

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#### **Cons:**

1. **Potential Age of the Model** The part number (21-99117-0) and frame designation (F56CFC7) suggest this may be an older or discontinued model. Newer motors often incorporate improved efficiency, digital diagnostics, or energy-saving features.

2. **Limited Modern Features** Unlike contemporary motors, this model may lack:

- **Energy-efficient ratings** (e.g., IE2 or IE3 standards).

- **Built-in sensors** for predictive maintenance (e.g., temperature or vibration monitoring).

- **Digital communication interfaces** (e.g., Modbus, Profibus) for integration with modern control systems.

- **Higher IP ratings** (e.g., IP55 or IP66) for dust/water resistance in harsh environments.

3. **Part Availability Challenges** While the frame size is standard, specific components (e.g., bearings, windings, or seals) for older Doerr motors may become harder to source over time, increasing long-term maintenance risks.

4. **Lower Efficiency Compared to Modern Alternatives** Newer IE3 or premium efficiency motors can offer 2-5% better efficiency, reducing energy costs over the motor s lifespan. This motor may not be the most cost-effective choice for long-term operation.

5. **Potential for Higher Maintenance** Older designs may require more frequent bearing lubrication, brush replacement (if brush-type), or winding repairs compared to sealed, maintenance-free motors.

6. **Regulatory Compliance Risks** Depending on the region, newer motors must meet stricter energy regulations (e.g., EU Ecodesign Directive). This motor may not comply with the latest standards, limiting its use in some markets.

7. **Limited Warranty** Doerr s warranty terms for older models may be less comprehensive than those offered by modern manufacturers, which often provide 1-2 years of coverage with extended options.

8. **Noise and Vibration** Older motors can sometimes exhibit higher noise levels or vibration compared to modern designs with better balancing and insulation.

9. **Higher Initial Cost for Replacement Parts** If the motor fails, replacement parts (especially for non-standard components) may be more expensive than those for newer, widely produced motors.

10. **Potential for Obsolete Control Schemes** The motor s wiring or terminal configuration might not align with modern variable frequency drive (VFD) setups, requiring additional adapters or modifications.

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### **Conclusion:**

The Doerr 21-99117-0 motor is a **practical and reliable choice for applications where cost, durability, and standard performance are prioritized over cutting-edge efficiency or modern features**. It is well-suited for:

- **Legacy systems** where compatibility with existing machinery is critical.

- **Budget-conscious buyers** who need a 6HP three-phase motor for light to medium industrial use (e.g., small workshops, farms, or commercial buildings).

- **Applications with controlled environments** where harsh conditions (dust, moisture, extreme temperatures) are not a concern.

However, if **energy efficiency, longevity, or ease of maintenance** are top priorities, a **modern IE3 or premium efficiency motor** from brands like Siemens, WEG, or TECO-Westinghouse would be a better long-term investment. These newer models offer:

- Better energy savings (lower operating costs).

- Longer warranties and easier part replacement.

- Integration with smart controls and diagnostics.

For **new installations or critical applications**, investing in a newer motor may outweigh the initial cost savings of the Doerr model.

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### **Recommendation:** - **Buy the Doerr motor if:**

- You need a **reliable, off-the-shelf 6HP three-phase motor** for a **non-critical, controlled environment**.

- You are **replacing an existing Doerr motor** in a system where compatibility is essential.

- You are operating in a **region where modern efficiency standards are not mandatory**, and energy savings are not a major concern.

- You can **source spare parts locally** and are prepared for potential maintenance challenges.

- **Avoid or upgrade to a newer model if:**

- You require **higher efficiency** (e.g., for 24/7 operation) to reduce energy costs.

- The application involves **harsh conditions** (high dust, moisture, or temperature fluctuations).

- You plan to **integrate the motor with modern controls** (VFDs, PLCs, or IoT systems).

- You want **longer warranties, better diagnostics, or easier part availability**.

- You are **starting a new project** and can afford the slightly higher upfront cost of a premium motor.

**Alternative Suggestion:**

If budget allows, consider a **WEG WJ063M4 or Siemens 1LA7 0635-2AB11** (both 6HP, three-phase, modern efficiency). These offer better long-term value despite a higher initial cost. If cost is a strict constraint, the Doerr motor remains a **decent second-choice** for basic industrial needs.

Details:

But when available in multiple quantity, the photo shown is representative of item. Combined shipping on multiple items. Whats Included. No stocking fees, no hassles.

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part #: 21991170 price

  • $150.00

specifications oelemot:

  • brand: Doerr
  • mpn: 21-99117-0
  • model: F56cfc7
  • part type: Motor
  • rated load: Hp
  • current type: Ac
  • ac phase: Three Phase

shipping oelemot:

  • cost: $98.80
  • class: Standard
  • type: Calculated
  • service: USPS Ground Advantage, FedEx Ground / FedEx Home Delivery
  • transit: 5-11 Days
  • carrier: USPS, FedEx

payments oelemot:

  • other
  • wallet: Paypal
  • credit card: Discover

offer oelemot:

  • options: Ship-to-home
  • quantity: 1
  • started: March 13, 2026
  • best offers: True
  • availability: In Stock
  • sold: 0

returns oelemot:

  • time: 30 Days
  • method: Money back
  • paid by: Buyer
  • policy: Returns Accepted

seller oelemot:

  • # reviews: 10121
  • rating: 100.0%
  • city: Galion, Ohio

general oelemot:

  • Industrial Automation Motion Controls > Electric Motors > General Purpose Motors
  • condition: Used
part type: motor, rated load: hp, current type: ac, ac phase: three phase,
category: business & industrial > industrial automation motion controls > electric > general purpose, sku: 20910351262440723,
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1 offer $150.00 USD
  • Used. Offer #1 priced at $150.00 + $106.70 shipping estimate = $256.70* total. But when available in multiple quantity, the photo shown is representative of the item.+$106.70 shipping

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