D.C. MOTORS, GEARMOTORS
24Pages

Dagu s.r.l. is a company that has grown over the years fairly quickly thanks to a constant commitment to the design, development and production of electric motors manufactured to meet the specific needs of a range of customers. In 2001, in reward for its constant efforts, the company obtained the ISO 9001:2008 quality certification and in 2004 the environmental certification ISO 14001. Beyond these achievements the company has recently obtained permission to use the UL/CSA markings on products.

Dagu and the environment Dagu has always considered respect for the environment and the ecosystem to be important and its company policies take account of the environmental impact of its activities, products and services. Dagu is committed to involving all the company functions in proportion to their resources, both human and financial, in a process of ongoing improvement aimed at preventing pollution and respecting the environment. In this sense, the company pays particular attention to aspects connected with emissions into the atmosphere and the production of scrap, acknowledging the need...

Dagu is an innovative dynamic company with a high level of know-how and technical expertise, particularly attentive to the needs of an increasingly segmented and differentiated market. One of its strengths is its ability to develop special motors to meet personal customer needs and its recognised production capability, covering both large and small production runs. Its in-house technical department is able to design and develop any commutator and permanent magnet electric motor, for both direct and alternating current. Dagu also has an advanced experimental and testing laboratory equipped...

Dagu’s motors and gearmotors are used in many sectors. The main fields of application are listed below: - Nautical: anchor winches, hydraulic control units, sail positioning, marine applications of dagu’s products - Industrial machines: machine tools, automatic machines, robots, textile machines, conveyor belts; - Packaging machines - Door opening automation: electric gates, automatic doors, turnstiles, automatic safety doors, barriers; - Railway applications: step, door closing, points, compressors; - Robotics: robot movement; - Automotive sector; - Small on-board lorry hoists; - Solar...

Useful hints on choosing the right motor are given below. A Permanent Magnet Dc Motor Is Preferable: - When the required speeds exceed the speeds linked to the network frequency; - When a battery or accumulator power supply is required; - When a high starting torque is required (Fig. 3); - When speed variation is required without resorting to expensive electronics. An Asynchronous Ac Motor Is Preferable: - When fixed speeds determined by the frequency of power supply network can be used (e.g. 2800, 1400, 950 rpm); - When higher speed stability is required (Fig. 1); - When an inverter can be...

It is also important to consider the form factor “Kf” of the power supply unit used. If the current flowing through the motor has a form factor higher than one, the motor will overheat because dissipation increases. This proportionately shortens the life of the motor, because the brushes are exposed to excessive heat due to the greater current peak value. Subsequently, the useful power of the motor is de-rated by 1/Kf as shown in Fig. 5. These factors considerably influence the speed of the motor; the speed increases with the Fig. 5 increase in the form factor of the voltage. Therefore,...

starting or breaking dynamic It can be useful to know the starting or braking dynamic of the motor. Starting time at a constant supply current is: where: ni = maximum motor speed with constant current input [min-1] I = input constant current [A] Kc = torque constant [Nm/A] Jtot = moment motor’s inertia plus the moments of inertia added to the motor’s shaft [m2 kg] (see tab. 6) Time starter with a constant voltage power supply is calculated using the time constant τ: where: Rtot = total resistance (armature and power cable) in W [Ω] Jtot = moment motor’s inertia plus the moments of inertia...

Dagu has a technical department for the realisation of new projects at its clients’ disposal, provided with computerised data acquisition system for performing bench tests on the motors and identifying all the real parameters; in the test room, life and mechanical stress tests can be performed on the motors and components. Dagu offers all the technical support necessary to develop innovative solutions and customize its products. On request, Dagu’s motors can be produced in material complying with the RoHS directive and can be UL certified. TABELLA DEI PARAMETRI MOTORE: ME45 028 ABC123...

The construction types commonly used are indicated in the drawings. Different construction types can be supplied on request. Motors with feet Motors with flange with through fixing holes Motors with flange with threaded fixing holes Motors with feet and flange with through fixing holes Motors with feet and flange with threaded fixing holes Motors with feet without front flange Motors without feet

No motor may be energised until the machine in which it is incorporated has been judged suitable and compliant with the safety standards in force. To avoid exposing machine operators and machinery to risks, bear in mind that the starting torque of permanent magnet DC motors is much higher than the nominal load torque. When using brushed DC motors, the power cables must be provided with a means for preventing the occurrence of irradiated or conducted electromagnetic interfere with the electrical and electronic devices installed on the machine itself or others. general instructions for...

The degrees of protection (IP) is expressed by a code formed by the letters “IP” followed by two numbers indicating conformity with the conditions shown in Tab. 10. The first digit-number indicates the degree of protection provided by the enclosure to persons and to the parts of the machine inside the enclosure. The second digit- number indicates the degree of protection provided by the enclosure with respect to harmful effects due to ingress of water. First specification number Description Non-protected machine Machine protected against solid objects greater than 12 mm Machine protected...