dematek motor Germany dematek model dematek price

dematek motors are named for their armature winding and field winding connected in series. Single-phase series-wound motors are AC/DC universal motors; they can operate on either AC or DC power supplies. The single-phase series-wound motor is widely used. Its advantages include high speed, high starting torque, compact size, light weight, resistance to stalling, and a wide applicable voltage range. Speed control via voltage adjustment is simple and easy to implement.

dematek motor classification

Motors feature advantages such as simple structure, compact size, high efficiency, and high power factor. Permanent magnet synchronous motors have achieved performance results in medium- and low-voltage applications across industries including metallurgy (ironworks and sintering plants), ceramics (ball mills), rubber (internal mixers), petroleum (pumping units), and textiles (two-for-one twisters, ring spinning frames), gradually accumulating design and operational experience. Classification by permanent magnet structure: Surface-mounted Permanent Magnet Synchronous Motor (SPMSM), Interior Permanent Magnet Synchronous Motor (IPMSM). Classification by stator winding induced EMF waveform: Sinusoidal Permanent Magnet Synchronous Motor, Brushless Permanent Magnet DC Motor. The starting current multiple of permanent magnet synchronous motors is approximately 9 times, which is 10% higher than that of asynchronous motors. Permanent magnet synchronous motors cannot use reduced-voltage starting methods. Under reduced-voltage supply conditions, the drop in asynchronous starting torque is greater than in asynchronous motors, causing starting difficulties. Regarding self-starting characteristics and feedback current during system short circuits, parameters vary significantly among manufacturers. Due to the difficulty in obtaining relevant data, the application of permanent magnet synchronous motors introduces uncertainties in short-circuit level assessments and starting calculation verifications for plant auxiliary power systems.

dematek motor mechanical characteristics

The motor allows stepless speed control. By controlling the opening of the intake or exhaust valve, i.e., controlling the compressed air flow, the motor's output power and speed can be adjusted to achieve the desired regulation. 2. Capable of both forward and reverse rotation. Most air motors can achieve forward and reverse rotation of the output shaft simply by using a control valve to change the intake and exhaust direction, allowing instantaneous reversal. Impact during direction change is minimal. A major advantage of air motor reversal is its ability to reach full speed almost instantaneously. Vane-type air motors can reach full speed within one and a half rotations; piston-type air motors can reach full speed in less than one second. Using a control valve to change the intake direction enables forward and reverse rotation. This process is fast, involves minimal impact, and does not require unloading. 3. Safe operation, unaffected by vibration, high temperature, electromagnetic fields, or radiation. Suitable for harsh environments, operating normally under adverse conditions such as flammable, explosive, high-temperature, vibratory, humid, and dusty environments. 4. Features overload protection; no failure occurs due to overload. During overload, the motor merely reduces speed or stops. Once the overload is removed, it resumes normal operation immediately without component damage. It can operate continuously at full load for extended periods with minimal temperature rise. 5. High starting torque allows direct loaded starting. Starting and stopping are rapid. Capable of loaded starts. 6. Wide power and speed ranges. Power ranges from a few hundred watts to tens of kilowatts; speed ranges from zero to ten thousand RPM. 7. Easy operation and maintenance. Air motors feature simple structure, compact size, light weight, high power, easy operation, and convenient maintenance. 8. Uses air as the medium, ensuring no supply difficulties. Exhaust air requires no treatment and is released into the atmosphere without pollution. Compressed air can be supplied centrally and transported over long distances. Due to these characteristics, air motors operate effectively in harsh environments such as high humidity, high temperature, and high dust. Beyond powering rock drilling, drilling, mining, and loading equipment in mining machinery, they are widely adopted in shipbuilding, metallurgy, chemical, and paper industries.

dematek motor working principle

When the motor's stator winding is connected to the power supply, it generates a rotating magnetic field. Since the magnetic reluctance of the rotor's direct axis is lower than that of the quadrature axis, and magnetic flux lines always close through the path of least reluctance, the stator magnetic field always attempts to align the rotor's direct axis with the stator field direction. When both the rotor and stator field rotate at synchronous speed n1, if there is no load on the shaft, the rotor's direct axis remains aligned with the stator magnetic field axis. If a load is present on the shaft, the load's resisting torque causes the rotor's direct axis to lag behind the stator magnetic field axis by an angle θ. This distorts the magnetic field and elongates the flux lines. The elongated flux lines attempt to shorten, generating a synchronous electromagnetic torque in the same direction as the rotor's rotation. If this synchronous electromagnetic torque balances the load torque, the rotor continues to rotate at synchronous speed; otherwise, the motor loses synchronism. To improve synchronous electromagnetic torque and power factor, the difference between direct-axis and quadrature-axis magnetic reluctances should be increased, i.e., increase the ratio Xd/Xq of direct-axis synchronous reactance Xd to quadrature-axis synchronous reactance Xq. For this purpose, the rotor may have a salient-pole structure, a non-salient pole structure with reaction slots cut into the rotor (usually filled with non-magnetic metal) to create unequal magnetic reluctances along the quadrature and direct axes, or a combination of both. However, Xd/Xq must not be too large, as excessive values make motor starting more difficult. The synchronous electromagnetic torque of a reluctance motor cannot start the motor; therefore, a squirrel-cage winding is installed on the rotor. Asynchronous electromagnetic torque is used to start the rotor, and when the speed approaches synchronous speed, the synchronous electromagnetic torque pulls the rotor into synchronism.

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