Motors are at the heart of any automated systems. When it comes to choose a motor, engineers have different possibilities. Depending on their applications (packaging, food and beverage, medical, infralogistics, agriculture,…), they need to meet a certain numbers of requirements (torque, speed, size, silent operation,…). Let’s consider DC motor more specifically here.
DC motor is characterised by linear operating principles. These principles make the features of the motor easier to use than those of synchronous or asynchronous motors.
The DC motor -whether Brush or Brushless– is composed of three main components:
A Brush DC motor contains: DC motor scheme
A Brushless DC motor contains:
A DC motor converts a direct current into a mechanical work. As the principle of Lorentz Law puts it : “the current carrying conductor placed in a magnetic and electric field experience a force”.
No matter how complex the winding is, once it is supplied with power, it can be represented as a ferromagnetic cylinder with a solenoid at its edge. The wire of this solenoid is made up of the bundle of wire located in each slot of the rotor. The rotor then acts as an electromagnet. The direction of its magnetic induction is the axis separating the wires of the solenoid according to the direction of the current passing through them.
Therefore, the motor consists of fixed magnets, a moving magnet (the rotor) and a metal housing to concentrate the flux.
Attraction of the unlike poles and repulsion of the like poles generates a torque which is applied to the rotor, causing it to turn. This torque is at its maximum when the axis of the rotor poles is perpendicular to the axis of the stator poles.
The efficiency of a motor is the ratio between the usable mechanical power that it can deliver and the electrical power that it absorbs. Since the usable and the absorbed powers vary differently with the speed of the motor, the efficiency also depends on the motor speed.
Many applications require a high starting torque. The DC motor, by its very nature, has a high torque vs. speed characteristic, enabling it to deal with high resistive torques and absorb sudden rises in load effortlessly. The motor speed adapts to the load. In addition, D.C motors are an ideal way of achieving the miniaturisation that is so desirable to designers, since they offer a high efficiency as compared with other technologies.
Wth a motor and control electronics, which can be used to control speed, forces and the direction of movement, to accelerate and decelerate, and count up and down the distance covered, it is easy to create automation systems.
Brushless DC motors incorporate CANopen technology to allow you to network several motors. This allows you to coordinate and synchronise every movement with high accuracy. Proven since 1980, the CANopen system ensures high reliability of data transmission through its error detection system.
With exceptional efficiency and working life, conformity to the strictest standards and wide range of available power supplies, Crouzet DCmind Brush Motors are ideal for use in medical equipment, pumps and valves, railways, and aeronautics.
DCmind Brushless motors, for their part, combine superb power density, integrated electronics and numerous functions for speed, torque and positioning control with absolute precision. This makes them ideal for applications in industry, valves and pumps, access control, robotics and the energy sector.