maxon DC motor Technology − short and to the point
Program − DCX − DC-max − RE − A-max
The outstanding technical features of maxon DC motors: − No magnetic cogging − High acceleration thanks to a low mass inertia − Low electromagnetic interference
1 Flange, front 2 Permanent magnet 3 Housing (magnetic return) 4 Shaft 5 Winding 6 Commutator plate 7 Commutator 8 Graphite brushes 9 Precious metal brushes 10 Cover 11 Electrical connection 12 Ball bearing 13 Sintered sleeve bearing 14 Flange, rear
− Low inductance − High efficiency
− Linearity between voltage and speed − Linearity between load and speed − Linearity between load and current − Small torque ripple thanks to multi-segment commutator − Able to bear high overloads for short periods − Compact design − small dimensions − Multiple combination possibilities with gears as well as DC tachometers and encoders Characteristics of the maxon DCX range: − High power density − High-quality DC motor with NdFeB magnet − High speeds and torques − Robust design (metal flange) − Easily configured online − Fast delivery Characteristics of the maxon DC-max range: − High-performance at low cost − Combines rational manufacturing and design of the A-max motors with the higher power density of the NdFeB magnets − Automated manufacturing process − Easily configured online − Fast delivery Characteristics of the maxon RE range: − High power density − High-quality DC motor with NdFeB magnet − High speeds and torques − Robust design (metal flange) Characteristics of the maxon A-max range: − Good price-performance ratio − DC motor with AlNiCo magnet − Automated manufacturing process Turning speed The optimal operating speeds are between 4000 rpm and 9000 rpm depending on the motor size. Speeds of more than 20 000 rpm have been attained with some special versions. A physical property of a DC motor is that, at a constant voltage, the speed is reduced with increasing loads. A good adaptation to the de- sired conditions is possible thanks to a variety of winding variants. At lower speeds, a gear combination is often more favorable than a slowly turning motor.
The maxon winding The “heart” of the maxon motor is the world- wide patented ironless winding, System maxon. This motor principle has very specific advantages. There is no magnetic detent and minimal electromagnetic interference. The efficiency of up to 90% exceeds that of other motor systems. There are numerous winding variants for each motor type (see motor data sheets). They are differentiated by the wire diameter and number of turns. This results in various motor terminal resistances. The wire sizes used are between 32 µm and 0.45 mm, resulting in the different terminal resistances of the motors. This influences the motor parameters that describe the transformation of electrical and mechanical energy (torque and speed con- stants). It allows you to select the motor that is best suited to your application. Effects of wire gauge and number of windings are:
Service life A general statement about service life cannot be made due to many influencing factors. Ser- vice life can vary between more than 20 000 hours under favorable conditions, and less than 100 hours under extreme conditions (in rare cases). Roughly 1000 to 3000 hours are attained with average requirements. The following have an influence: 1. The electric load: higher current loads result in greater electric wear. Therefore, it may be advisable to select a somewhat stronger motor for certain applications. We would be happy to advise you. 2. Speed: the higher the speed, the greater the mechanical wear. 3. Type of operation: extreme start/stop, left/ right operation leads to a reduction in service life. 4. Environmental influences: temperature, humidity, vibration, type of installation, etc. 5. In the case of precious metal brushes, the CLL concept increases service life at higher loads and the benefits of precious metal brushes are retained. 6. Combinations of graphite brushes and ball bearings lead to a long service life, even under extreme conditions.
Low terminal resistance − Low resistance winding − Thick wire, few turns − High starting currents − High specific speed (rpm per volt) High terminal resistance − High resistance winding − Thin wire, many turns − Low starting currents − Low specific speed (rpm per volt)
The maximum permissible winding tempera- ture in high-temperature applications is 125°C (155°C in special cases), otherwise 100°C or 85°C.
62 Technology – short and to the point
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