Open Frame / Frameless DC Motors
Description
Frameless DC motors, also known as open frame motors, are designed to provide high precision, high torque, and high efficiency in a compact form. These motors consist of two main components: a wound coil stator with multiple poles and a hollow shaft rotor made of rare earth neodymium magnets. By omitting the traditional housing, end caps, bearings, and sensors, frameless DC motors offer a reduction in size, mass, and inertia, making them ideal for integration into small, compact machines.
Working Principle
Frameless DC motors operate by utilizing the interaction between the magnetic field generated by the stator and the magnetic field of the rotor. The rotor, equipped with neodymium magnets, rotates within the stator's magnetic field, producing torque. This design allows for direct integration into mechanical assemblies, transmitting torque efficiently. The absence of a frame and other components reduces mechanical losses and enhances cooling efficiency, contributing to the motor's high torque-to-inertia ratio and overall performance.
Applications
Frameless DC motors are particularly suited for applications requiring precision and compactness. They are commonly used in robotic applications, such as robotic joints and surgical robot end effectors, where precise servo-driven movement is essential. Additionally, these motors are employed in the medical industry for devices like breathing machines, where low noise and high efficiency are critical. The pump industry also benefits from frameless motors due to their ability to deliver high torque in a space-saving design.
Advantages over other DC Motors
Frameless DC motors offer several advantages over traditional DC motors. They provide significant weight savings and space efficiency, which are crucial in applications like robotics and medical devices. The high torque-to-inertia ratio and enhanced cooling efficiency result in improved performance and reduced mechanical losses. Furthermore, the ability to integrate directly into mechanical assemblies allows for greater design flexibility and optimization of system performance.
Limitations
One limitation of frameless DC motors is the potential for higher initial costs due to the need for additional components and customization during integration. The absence of a frame and other protective components may also expose the motor to environmental factors, potentially affecting durability. Additionally, the integration process can be complex, requiring precise alignment and assembly to ensure optimal performance.
Considerations
When considering frameless DC motors, it is important to evaluate the initial costs, which may be higher due to the need for additional components and customization. Operating expenses can be reduced through the motor's high efficiency and low mechanical losses. Durability may be a concern due to the lack of protective housing, so careful consideration of the operating environment is necessary. Accuracy and performance depend on precise integration, which may increase replacement and maintenance costs if not executed correctly.
from Shenzhen Power Motor Industrial Co., Ltd.
Light Weight; Small Size; High Rotational Speed. [See More]
- Environmental Features: Open Frame / Frameless
- DC Voltage Range: 3.0
- Commutation: Brushless
- Continuous Torque: 0.0
from 3X Motion Technologies Co., Ltd
Poles : 10. Rated power (W) : 570. Rated voltage (V) : 48. Rated torque (N.m) : 3.9. Peak torque (N.m) : 12.7. Rated current (A) : 14.1. Max speed (rpm) : 1400. Rated speed (rpm) : 1167. Torque constant (Nm/A) : 0.251. Moment of Inertia (kgcm ²) : 3.93. BEMF (Vrms/krpm) : 16.7. Size (mm) : 115. [See More]
- Environmental Features: Open Frame / Frameless
- Torque Constant: 35.54
- Standard DC Voltage: 48V
- Output Power: 0.7639
from Shenzhen Power Motor Industrial Co., Ltd.
Low Noise; High Efficiency; Long Life. [See More]
- Environmental Features: Open Frame / Frameless
- DC Voltage Range: 28.0
- Commutation: Brushless
- Continuous Torque: 0.0
from Shenzhen Power Motor Industrial Co., Ltd.
Customizable; High Efficiency; Long Life. [See More]
- Environmental Features: Open Frame / Frameless
- DC Voltage Range: 36.0
- Commutation: Brushless
- Output Power: 0.2337
from Shenzhen Power Motor Industrial Co., Ltd.
Customizable; High Speed of Revolution; Long Life. [See More]
- Environmental Features: Open Frame / Frameless
- Standard DC Voltage: 48V
- Commutation: Brushless
- DC Voltage Range: 48.0
from Shenzhen Power Motor Industrial Co., Ltd.
High Efficiency; Fast Response; Wide Speed Regulation. [See More]
- Environmental Features: Open Frame / Frameless
- Standard DC Voltage: 24V
- Commutation: Brushless
- DC Voltage Range: 24.0
from Shenzhen Power Motor Industrial Co., Ltd.
Large Inner Diameter Through Holes; Accommodates Shafts, Cables, Tools, etc.; Low Cogging Design; Stainless Steel Inner Ring, Effective Anti-Corrosion; High Efficiency Achieved Over a Wide Speed Range. [See More]
- Environmental Features: Open Frame / Frameless
- Standard DC Voltage: 48V
- Commutation: Brushless
- DC Voltage Range: 48.0
from Shenzhen Power Motor Industrial Co., Ltd.
Low noise, high rotational speed accuracy (600 ±1 rpm), and long life. [See More]
- Environmental Features: Open Frame / Frameless
- DC Voltage Range: 5.0
- Commutation: Brushless
- Output Power: 0.4034
from Shenzhen Power Motor Industrial Co., Ltd.
Low Noise; High Rotational Speed Accuracy (600 ± 1 rpm); Long Life. [See More]
- Environmental Features: Open Frame / Frameless
- DC Voltage Range: 5.0
- Commutation: Brushless
- Output Power: 5.36E-4
from Genesis Motion
The LiveDrive ® LDX is a patented frameless motor with superior torque to length, torque to mass, and motor constant (Km) compared to other direct drive motors. Your machines can accelerate faster, with increased payload, and reduced size/weight. [See More]
- Environmental Features: Open Frame / Frameless
- Output Power: 0.6567
- Commutation: Brushless
- Continuous Current: 2.26
from Kollmorgen Corporation
Direct Drive DC torque motors are ideal for servo applications where it is desirable to minimize size, weight, power and response time, and to maximize rate and position accuracies. These motors provide a servo actuator that can be attached directly to the driven load. A permanent magnet field and a... [See More]
- Environmental Features: Open Frame / Frameless
- Output Power: 1/4 HP; 300 W; 1/2 HP; 1 HP; 2 HP; 5 HP / 3.6 KW
- Commutation: Brush
- Output Power: 0.0129 to 8.44
from Aerotech, Inc.
Design Features. Slotless, brushless ring motors with high torque output and zero cogging. Frameless design for easy integration into OEM machines. Various winding options available. Includes Hall effect sensors for commutation [See More]
- Environmental Features: Open Frame / Frameless
- DC Construction: Permanent Magnet; Coreless / Slotless
- Commutation: Brushless
- Standard DC Voltage: 160V
from Canon USA Motion Control
Canon's frameless motors are lightweight and high-performance in compact size. These built-in type frameless motors enable space-saving installation and flexibility in mechanical design. Size, voltage, speed, shaft type and rotor type can be customized based on a customer's request. Compact size and... [See More]
- Environmental Features: Open Frame / Frameless
- Standard DC Voltage: 24V
- Commutation: Brushless
- Output Power: 0.0402
from Parker Hannifin / Automation / Electromechanical Division - Europe
Continuous torque from 14 Nm to 2700 Nm with natural convection (according to size), and up to 6100 Nm with fluid cooling. Six external diameters from 145 mm to 800 mm. Internal diameters from 56 mm to 630 mm. Various windings available from 30 min-1 to 1500 min-1 according to size. Parker?s STK... [See More]
- Environmental Features: Open Frame / Frameless
- DC Construction: Permanent Magnet
- Commutation: Brushless
- Output Power: 1 HP; 2 HP
from SKF/Global
SKF Magnetic Bearings has developed an extensive line of frameless Brushless DC motors for both magnetic bearing and rolling element bearing spindles. [See More]
- Environmental Features: Open Frame / Frameless; Cryogenic Use; Vacuum Use
- DC Construction: Permanent Magnet
- Commutation: Brushless
- Standard DC Voltage: 72V
from Genesis Motion
The LiveDrive ® LDX is a patented frameless motor with superior torque to length, torque to mass, and motor constant (Km) compared to other direct drive motors. Your machines can accelerate faster, with increased payload, and reduced size/weight. [See More]
- Environmental Features: Open Frame / Frameless
- Standard DC Voltage: 48V
- Commutation: Brushless
- Output Power: 0.6138
from Kollmorgen Corporation
The RBE Series from Kollmorgen is a proven platform offering many years of direct drive motor solutions in various industries such as defense, semiconductor, machine tools, industrial automation, medical, and robotics. The frameless configuration is provided as a rotor and stator component that are... [See More]
- Environmental Features: Open Frame / Frameless
- Output Power: 1/4 HP; 300 W; 1/2 HP; 1 HP; 2 HP; 5 HP / 3.6 KW
- Commutation: Brushless
- Output Power: 0.0188 to 4.95
from Kollmorgen Corporation
The Kollmorgen TBM (Torquer Brushless Motor) Series direct drive frameless motor is designed to be directly embedded in your machine, using the machine ’s own bearings to support the rotor. This series is designed for applications that require high power in a small, compact form factor with... [See More]
- Environmental Features: Open Frame / Frameless
- Standard DC Voltage: 24V; 48V; 72V; 90V
- Commutation: Brushless
- DC Voltage Range: 24.0 to 96.0