Motor Coil Cross Section Your miniature motion challenges are unique and your ideas for meeting those challenges are equally unique. Brush DC Spotlight on Innovation Brush DC Motor Basics Brush DC Working Principles From medical to aerospace or security and access, Portescap’s brush DC motion solutions are moving life forward worldwide in critical applications. The following Brush DC section features our high efficiency and high power density with low inertia coreless brush DC motor technology. How to select your Brush DC motor 57 Brush DC Specifications Where to apply Brush DC motors Brush DC motors at Work

Long life Patented Commutation Sysyem Virtually Eliminates Brush Maintenance Models Available from 8mm to 35mm Diameter Select Either Sleeve or Ball Bearings Ironless Rotor Coil Enables High Acceleration High Efficiency Design Ideal for Battery-Fed Applications Optional Gearboxes and Magnetic or Optical Encoders Are Easily Added Innovation & Performance Portescap’s brush DC coreless motors incorporate salient features like low moment of inertia, no cogging, low friction, very compact commutation which in turn results in high acceleration, high efficiency, very low joule losses and higher continuous...

INNOVATION Innovation is a passion at Portescap. It defines your success, and defines our future. We help you get the right products to market faster, through rapid prototyping and collaborative engineering. With experienced R&D and application engineering teams in North America, Europe, and Asia, Portescap is prepared to create high-quality precision motors, in a variety of configurations and frame sizes for use in diverse environments. Demanding application? Portescap is up for the challenge. Take our latest innovation Athlonix in high power density motors. Ultra-compact, and designed for lower...

Brush DC Motor Basics Construction of Portescap motors with iron less rotor DC motors All DC motors, including the ironless rotor motors, are composed of three principle sub assemblies: 1. Stator 2. Brush Holder Endcap 3. Rotor Stator Tube Self Supporting High Packing Density Rotor Coil Sleeve or Ball Bearing Collector High Efficiency High Strength Rare Earth Magnet Cable Clamp Metallic Alloy Brush Commutation System 1. The stator The stator consists of the central, cylindrical permanent magnet, the core which supports the bearings, and the steel tube which completes the magnetic circuit. All...

B — A method which avoids these coil heads uses an armature wire that is covered with an outer layer of plastic for adhesion, and is wound on a mobile lozenge-shaped support. Later, the support is removed, and a flat armature package is obtained, which is then formed into a cylindrical shape (Figure 1). The difficulty with this method lies in achieving a completely uniform cylinder. This is necessary for minimum ripple of the created torque, and for a minimum imbalance of the rotor. Figure 1 - Continuous winding on mobile support 2a 3 b) armature as flat package c) forming of armature in cylindrical...

Features of Ironless Rotor DC Motors The rotor of a conventional iron core DC motor is made of copper wire which is wound around the poles of its iron core. Designing the rotor in this manner has the following results: • A large inertia due to the iron mass which impedes rapid starts and stops • A cogging effect and rotor preferential positions caused by the attraction of the iron poles to the permanent magnet. • A considerable coil inductance producing arcing during commutation. This arcing is responsible on the one hand for an electrical noise, and on the other hand for the severe electro—erosion...

Brush DC Working Principles The electromechanical properties of motors with an ironless rotor : Graphic express U = M x R + k x ω (4) characteristic: with ironless rotors can be described by means of the following equations: n By calculating the constant k and k from the n 1. The power supply voltage U is equal to dimensions of the motor, the number of turns U the sum of the voltage drop produced by the per winding, the number of windings, the current I in the ohmic resistance R of the diameter of the rotor and the magnetic field rotor winding, and the voltage U induced in in the air gap, we...

Brush DC Working Principles through the effect of the rotor current, particularly in the event of slow or repeated starting. The torque M produced by the starting-current I is obtained as follows: M = I x k - M = (I - I )k (9) d required for obtaining a speed of rotation n for a given load torque M (angular velocity ω = n x 2π/60). By introducing equation (10) into (6) we obtain: U = M + I R + k x ω (13) k L By applying equation (1), we can calculate the angular velocity ω produced under a voltage U with a load torque M . We first determine the current required for obtaining the torque M=M +M:...

How to select your Coreless motor PRODUCT RANGE CHART FRAME SIZE Max Continuous Torque Motor Regulation R/K Rotor Inertia Rotor Inertia FRAME SIZE Rotor Inertia Rotor Inertia Motor Designation 22 Motor diameter (in mm) Bearing type: blank = with sleeve bearings 2R = with front and rear ball bearings Coil type: nb of layer wire size type connexion Commutation size & type/ magnet type: Alnico/ Precious Metal = 18, 28, 48, 58 Alnico/ Graphite & Copper = 12 Motor generation/ length: L, C = old generation (C: short, L: long), Alnico Magnet S, N, V = middle generation (S: short, N: normal, V: very...

Explanation of Specifications MOTOR PART NUMBER MEASURING VOLTAGE Is the DC voltage on the motor terminals and is the reference at which all the data is measured This is the the speed at which motor turns when the measuring voltage is applied with out any load STALL TORQUE Minimum torque required to stall the motor or stop the motor shaft from rotating at measuring voltage AVERAGE NO LOAD CURRENT The current drawn by the motor at no load while operating at the measured voltage TYPICAL STARTING VOLTAGE The minimum voltage at which the motor shaft would start rotating at no load MAX RECOMMENDED...