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MOTION CONTROL AT THE SPEED OF TECHNOLOGY™
DC Motors
DC motors are electromechanical devices which use the interaction of magnetic fields and conductors to convert the electrical energy into rotary mechanical energy. DC motors are the most commonly used actuators for continuous motion and consist of the following basic parts:
- Stator: stationary portion of the motor
- Rotor: rotating portion of the motor
- Commutator: can be brushed or brushless
- Field magnets: provide the magnetic field that turns an axle connected to the rotor
DC motors are commonly used to drive equipment such as conveyor belts, elevators, cranes, turntables, and hoists. Electromate supplies a range of DC motors from top manufacturer, Groschopp.
Types of DC Motors: Brushed vs Brushless
Servo motors are basically a brushless or brushed DC motor with a form of position feedback control connected to the rotor shaft.
Brushed DC Motors
Brushed DC motors produce a magnetic field in a wound rotator. The stator’s magnetic field is produced by either a stator field winding or by permanent magnets. The Permanent Magnet DC Motor (PMDC Motor) is a good fit for applications that require a high starting torque which allows the motor to reliably lift heavy loads. In intermittent applications, even with a PMDC’s brush design, the motor can be expected to have a 2000+ hour life. The use of permanent magnets gives the DC motor a better linear speed/torque characteristic, making them more suitable for use in robotics and servos.
Brushed DC Motor Features:
- DC motors are constructed with class "B" insulation components, allowing for running temperatures up to 130° C
- High starting torque
- Optional hardened output shaft
- Standard brush life of 2,000+ hours (varies by application)
- Totally enclosed construction (typical)
- Low cost
Brushless DC Motors
Brushless DC motors produce a magnetic field in the rotor by using permanent magnets attached to it. They tend to be smaller and more expensive than convention brushed DC motors. However, they tend to have better torque/speed characteristics, are more efficient, and have a longer operating life.
Brushless DC motors (BDCM) are very similar to a permanent magnet DC motor, but does not have any brushes to replace or wear out due to commutator sparking; this results in a longer life span.
Brushless motors offer the following advantages over their “brushed” counterparts:
- High efficiencies
- High reliability
- Low electrical noise
- Good speed control
- No brushes or commutator to wear out à higher speed
- Longer life span
Parvalux DC Motors
Permanent Magnet DC (PMDC) motors are distinct in that their magnetic field is generated by permanent magnets located in the stator, rather than being created in stator windings. These motors are typically smaller in size but deliver impressive output performance, making them an excellent choice for a variety of applications including mobility, patient care, industrial automation, and leisure products.
PMDC motors offer several advantages. They are cost-effective and possess a high starting torque. Despite their smaller size, PMDC motors provide impressive output, contributing to their popularity across many applications.
Parvalux has been manufacturing a wide range of PMDC motors for over 70 years, earning trust globally. These motors are often paired with gearboxes to decrease speed and increase torque, creating an optimal geared motor solution. Parvalux's PMDC motors are versatile, catering to a broad spectrum of industries.
In terms of product range, Parvalux offers:
- Standard PMDC motor-only products with speeds ranging from 1000 to 5000 RPM, power up to 2030 Watts, and torque between 0.1 and 4.9 Nm.
- Standard right-angle and inline PMDC geared motor combinations with speeds from 0.2 to 1390 RPM, power from 23 to 750 Watts, and torque from 0.1 to 150 Nm.
Customization options for PMDC motors include shaft variations, output flange options, different cable lengths, brakes, encoders, paint finishes, and terminal boxes. For those with specific requirements, Parvalux recommends a fully customized solution, which allows integration with other drive system components. Parvalux's engineering teams, with their extensive application-specific knowledge, are adept at producing PMDC motors that are precisely tailored to individual needs.
