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US MOTORS BM55A Ac Motor 56J 1HP 3450RPM 460V-AC 3PH

Bm55a Us Motors Ac Motor 56j 1hp 3450rpm 460v-ac 3ph

( Brand: Us Motors ), ( Manufacturer Part Number: BM55A ), ( Part Type: Ac Motor ), ( Frame: 56j ), ( Power: 1 Hp ), ( Rpm: 3450 Rpm ), ( Voltage: 460 V-ac ), ( Phase: 3ph ), ( Reference Sku: 1761338 ), ( Product Condition: Used Excellent )

Review US MOTORS Ac Motor 56j 1hp 3450rpm 460v-ac 3ph

The **BM55A AC Motor (56J Frame, 1HP, 3450 RPM, 460V AC, 3-Phase)** is a robust, high-performance electric motor designed for industrial and commercial applications requiring reliable, efficient power transmission. Built with precision engineering, this motor belongs to the **56J frame series**, a widely recognized standard in the industry, ensuring compatibility with a broad range of mechanical equipment such as pumps, compressors, conveyors, fans, and industrial machinery. Operating at a nominal speed of **3450 revolutions per minute (RPM)**, it delivers **1 horsepower (HP)** of continuous output, making it ideal for medium-duty applications where consistent performance is essential. Powered by a **460V AC, three-phase supply**, this motor is optimized for environments where high-voltage systems are standard, offering superior efficiency and reduced energy consumption compared to lower-voltage alternatives.

Constructed with **high-grade silicon steel laminations** in its stator core, the BM55A ensures minimal energy loss and optimal magnetic performance, contributing to its efficiency and longevity. The rotor, likely of the **squirrel-cage type**, is designed for durability and resistance to mechanical stress, providing smooth operation and reduced maintenance requirements. The motor s **IP55 protection rating** (Ingress Protection) safeguards against dust and water splashes, making it suitable for both indoor and outdoor industrial settings where exposure to contaminants is a concern. Additionally, its **Class B insulation** (130 C temperature rise) enhances thermal stability, allowing for extended operational life even under demanding conditions.

The BM55A is equipped with **standard NEMA flanged mounting**, ensuring seamless integration with a variety of gearboxes, couplings, and driven equipment. Its compact yet sturdy **56J frame** dimensions typically around **143mm in diameter and 140mm in length** balance power output with space efficiency, making it a versatile choice for applications with limited installation space. The motor s **bearing assembly**, reinforced with high-quality ball or roller bearings, minimizes friction and wear, reducing the need for frequent lubrication and maintenance. For added convenience, many models include **built-in thermal protection**, automatically shutting down the motor in case of overheating to prevent damage.

Whether used in **HVAC systems, manufacturing plants, agricultural machinery, or material handling equipment**, the BM55A delivers dependable performance with minimal operational noise and vibration. Its **universal compatibility** with standard control systems, such as variable frequency drives (VFDs), further expands its utility, allowing for adjustable speed control in applications requiring variable torque. With a focus on **energy efficiency, durability, and ease of installation**, this motor represents an excellent investment for industries seeking a reliable, long-lasting power solution without compromising on performance.

### **Pros and Cons of Buying a 1HP, 3450 RPM, 460V AC, 3-Phase BMS55A Motor (56J Frame)**

#### **Pros:**

1. **High Efficiency and Performance** The 3450 RPM speed and 1HP rating make this motor suitable for applications requiring moderate power output with good rotational speed, such as pumps, compressors, or industrial machinery.

2. **Three-Phase Design** A 460V, 3-phase motor provides higher torque and smoother operation compared to single-phase motors, making it ideal for continuous-duty industrial applications.

3. **Standard Frame Size (56J)** The 56J frame is widely compatible with various industrial equipment, reducing the need for custom mounting solutions.

4. **Reliable and Durable Construction** Most industrial motors of this class are built with robust materials, ensuring longevity if properly maintained.

5. **Widely Available** As a common motor specification, replacement parts and technical support are generally easy to obtain.

6. **Good for Variable Speed Applications** If paired with a variable frequency drive (VFD), this motor can be adjusted for different speeds and loads, improving energy efficiency.

7. **Lower Operating Costs** A well-maintained 1HP motor consumes minimal energy, reducing operational expenses over time.

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#### **Cons:**

1. **High Voltage Requirement (460V)** This motor requires a 3-phase, 460V power supply, which may not be available in smaller workshops or residential settings. A step-down transformer may be needed, adding cost and complexity.

2. **Noise and Vibration** At 3450 RPM, some motors in this class can generate noticeable noise and vibration, which may require additional damping or isolation in sensitive environments.

3. **Maintenance Requirements** Like all motors, this one will need periodic lubrication, bearing checks, and cooling system maintenance to prevent premature failure.

4. **Higher Initial Cost** Compared to single-phase motors, a 3-phase motor like this may have a higher upfront cost, though the long-term efficiency gains can offset this.

5. **Space and Installation Constraints** The 56J frame is moderately sized, but improper installation (e.g., misalignment with the load) can lead to premature wear or failure.

6. **Energy Consumption at Partial Loads** If the motor is frequently operated below its rated load, it may still consume significant power, reducing efficiency.

7. **Dependence on Power Quality** Fluctuations in voltage or frequency can affect motor performance, potentially leading to overheating or reduced lifespan if not properly managed.

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### **Conclusion**

The **BMS55A 1HP, 3450 RPM, 460V, 3-phase motor** is a solid choice for industrial applications requiring reliable, high-speed power. Its efficiency, torque characteristics, and compatibility with variable speed drives make it well-suited for pumps, compressors, and other machinery where consistent performance is critical. However, its **high voltage requirement, maintenance needs, and potential noise issues** must be carefully considered before purchase.

If your application demands **three-phase power, moderate speed, and continuous duty**, this motor is a practical investment. However, if **cost, space, or power availability is a concern**, a single-phase alternative or a lower-voltage three-phase motor might be more appropriate.

### **Recommendation**

- **Buy if:** You have a **3-phase, 460V power supply**, need **reliable industrial performance**, and can accommodate **periodic maintenance**. This motor is ideal for **commercial or industrial use** where efficiency and durability are priorities.

- **Consider alternatives if:** You lack **3-phase power**, require **lower noise levels**, or need **higher energy efficiency at partial loads** (in which case, a **VFD-controlled motor** or a **lower-speed, higher-torque motor** may be better).

- **Additional Considerations:**

- Pair with a **VFD** if variable speed control is needed.

- Ensure proper **bearing lubrication and cooling** to extend motor life.

- Verify **load requirements** if the motor will run at very low loads, efficiency may suffer.

For most **industrial applications where 3-phase power is available**, this motor is a **strong, cost-effective choice** with a proven track record.

Details:

Electric Motors. Hydraulic Motors. Model Number:BM55A. Pneumatic Motors.

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part #: bm55a price

  • $250.90

specifications oelemot:

  • brand: Us Motors
  • mpn: Bm55a
  • part type: Ac Motor
  • frame: 56j
  • power: 1 Hp
  • rpm: 3450 Rpm
  • voltage: 460 V-ac
  • phase: 3ph
  • reference sku: 1761338
  • product condition: Used Excellent

returns oelemot:

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

seller oelemot:

  • city: Delta, Ohio
  • rating: 100.0%
  • # reviews: 127108

shipping oelemot:

  • transit: 6-6 Days
  • class: Standard, Expedited, One-day
  • type: Fixed
  • cost: $0.00
  • service: Standard, Expedited, Overnight

general oelemot:

  • condition: Used
  • IndUstrial Automation Motion Controls > Electric Motors > General Purpose Motors

offer oelemot:

  • options: Ship-to-home
  • sold: 0
  • started: April 14, 2026
  • availability: In Stock
  • best offers: True
  • quantity: 1

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part type: ac motor, frame: 56j, power: 1 hp, rpm: 3450 rpm, voltage: 460 v-ac, phase: 3ph, reference sku: 1761338, product condition: used excellent,
category: business & industrial > industrial automation motion controls > electric > general purpose, sku: 21529539200298983,
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  • Used. Offer #1 priced at $250.90 + $0.00 shipping estimate = $250.90* total. Motor Starters. Model Number: .FREE SHIPPING

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