Handbook for selection of motors
96Pages

Handbook for selection of motors

Editorial Dunkermotoren GmbH is an internationally operating company and a leader in the field of lowpower electrical motors. Dunkermotoren GmbH offers a wide range of gearboxes and electrical motors based on a sophisticated modular system. In combination with many years of experience in development, manufacturing and design of electrical motors Dunkermotoren GmbH presents itself as a supplier of simple electric motors as well as a partner for the realization of complex motor technologies. The current formulary was created by specialists to support users of electrical motors. It helps to...

1 Systematic Electrical motors consist of a variety of components which are to be treated mathematically. • The gearbox is a mechanical converter. It adjusts the physical quantities, such as the The electrical motor serves as an energy converter which converts the electrical energy 1 Systematic speed and the torque, delivered by of motor to the which are to be treated mathematically. Electrical drives consist of a variety thecomponents requirements of the working machine. • The gearbox is a energy. supplied into mechanical mechanical converter. It adjusts the physical quantities, such as th...

11. Selection of the optimum motor technology Figure 2 Procedure for the design of electrical motors Constant speed motors Constant speed motors are operated at a fixed speed. They only have facilities for switching on and off, as well as for protection against overload. There is no speed adjustment device. Typical applications » Pumps » Fans » Conveyors Variable speed motors are adjustable in their speed. In addition to the electrical motor, they have a control unit that is responsible for the speed adjustment. Typical applications » Trolleys » Hoists » Conveyors » Pull motors and...

machines • Conveyors • Feed drives in machine tools • Pull drives and winders for continuous webs (film, paper, • Robot drives textile fibres, wire) Selection of the optimum motor technology able 1 Classification of electrical drives with regard to speed adjustability Conveyors Classification by operational quadrant .1.2 Classification by operational quadrant Electrical drives have the ability of reversing the direction of rotation and the ability of energy recovery. hese characteristics of an electrical drive are shown in a speed-torque diagram. Depending on the ign of the speed and the...

Selection of the optimum motor technology At asynchronous motors a difference between the frequency of the motor current and the rotational frequency occurs. They can be operated either directly on the AC grid as well as on actuators. If a motor is operated on a control unit, the control unit decides on the possibility and quality of the speed adjustability. Simple control units such as frequency converters or commutation electronics enable speed changes within the range of seconds. High-performance control units (e.g. servo controllers) adjust the motor position and speed very precisely...

Selection of the optimum motor technology The suitable motor technology can easily be selected by using table 2 which contains all motor technologies that may be considered. The form allows the selection in two steps: In the first step, all the motor technologies which cannot meet the technical requirements of the application are eliminated. Technical exclusion criteria are used for this purpose. If a motor technology can not cover these criteria, it is excluded for the second step. In the upper part of Table 2 for each exclusion criterion it is marked, if the motor technology meets the...

Selection of the optimum motor technology High speed accuracy and high dynamics Depending on the design of the control unit, the motor technologies differs in their ability to set the speed precisely and dynamically. Low grid perturbation Depending on the presence of a control device, the motor technologies load the power supply network during start-up with a high or low start-up current. Low cost The motor technologies have different costs because of the different types of motor and control unit. Low complexity Depending on the design, the motor technologies are more or less complex and...

Table 2 Form for selecting the optimum motor technology

Selection of the optimum motor technology

Selection of the optimum motor technology Electrical motors from Dunkermotoren Permanent Magnet DC Motors - Series GR Brush type commutated DC motors from Dunkermotoren are notable for robust and maintenance-free design, longer lifetime than commutated motors from other manufacturers, motor insulation class E, extremely high short time overload capacity of the motor and especially high quality due to fully automated production lines. The DC motors can be combined with control electronics, gearboxes, brakes and encoders in a modular system to provide flexible, adaptable, market-oriented...

Selection of the optimum motor technology Dunkermotoren offers single-phase AC motors of the series KD and three-phase AC motors of the series DR. The motors can be combined with brakes and gearboxes. Dunkermotoren offers a wide spectrum of linear motor technology. Whether direct tubular linear motors for highly dynamic positioning tasks or spindle systems with thrust forces in the range of kilo Newton. 2.4 Example: Pump motor The form for selecting the optimum motor technology is applied to a pump motor. The following requirements are specified for the pump motor: Operating conditions:...

Selection of the optimum motor technology For the second step, the requirements of the application are weighted and the priorities are assigned: Table 4 Ranking of motor technologies for a pump motor The optimum motor technology is thus the brushless DC motor (BG) with power electronics and open loop V-Control. 2.5 Example: Door motor The form for selecting the optimum motor technology is subsequently applied to a motor for an elevator door. The following basic conditions are given for the door motor: The form for selecting the optimum motor technology is subsequently applied to a motor for...