stamford-avk motor Germany stamford-avk model stamford-avk price

stamford-avk motors are a new generation of gear reduction motors, featuring compact size, low noise, maintenance-free operation, and an attractive appearance. The speed ranges from 0.83r/min to 300r/min. This series of low-speed motors is a new high-tech product that integrates electromagnetic drive and reduction mechanism within the motor housing. The low speed and high torque can directly meet customer requirements without the need for additional reduction devices. The motor uses Class B and Class F insulation, with protection ratings of IP44 and IP55, and voltages of 220V and 380V.

stamford-avk motor operating principle

The motor has two windings: a starting winding and a running winding. The two windings are spatially displaced by 90 degrees. A large-capacity capacitor is connected in series with the starting winding. When the running winding and the starting winding are supplied with single-phase AC power, the capacitor causes the current in the starting winding to lead the current in the running winding by 90 degrees in time, reaching its maximum value first. This creates two identical pulsating magnetic fields in time and space, generating a rotating magnetic field in the air gap between the stator and the rotor. Under the action of the rotating magnetic field, an induced current is generated in the motor rotor. The interaction between this current and the rotating magnetic field produces electromagnetic torque, causing the motor to rotate.

stamford-avk 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 magnetic circuit is lower than that of the quadrature axis magnetic circuit, 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 direction of the stator magnetic field. When both the rotor and the stator magnetic field rotate at the 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 there is a load 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. At this point, the magnetic field is distorted, and the magnetic flux lines are stretched. The stretched flux lines attempt to shorten, producing a synchronous electromagnetic torque in the same direction as the rotor's rotation. If the synchronous electromagnetic torque can balance the load torque, the rotor will continue to rotate at synchronous speed; otherwise, the motor will lose synchronism. To improve synchronous electromagnetic torque and power factor, the difference between the direct-axis and quadrature-axis magnetic reluctances should be increased, i.e., increase the ratio Xd/Xq of the direct-axis synchronous reactance Xd to the quadrature-axis synchronous reactance Xq. For this purpose, the rotor can have a salient-pole structure, or a non-salient pole structure with reaction slots cut into the rotor (usually filled with non-magnetic metal) to create unequal magnetic reluctances in the quadrature and direct axes, or a combination of both structures. However, Xd/Xq should not be too large, as excessive values make motor starting more difficult. The synchronous electromagnetic torque of a reluctance motor cannot start the motor, so a squirrel-cage winding must be installed on the rotor. This utilizes asynchronous electromagnetic torque to start the rotor. When the speed approaches synchronous speed, the synchronous electromagnetic torque pulls the rotor into synchronism.

stamford-avk motor performance

Since the 80s of the 20th century, with the development of integrated circuits, power electronics, and AC variable-speed drive technologies, permanent magnet AC servo drive technology has seen significant advancements. Famous electrical manufacturers worldwide have successively launched their own series of AC servo motors and servo drives, continuously improving and updating them. AC servo systems have become the main development direction for contemporary high-performance servo systems, putting traditional DC servos at risk of obsolescence. After the 90s, AC servo systems commercialized worldwide adopted fully digital control sinusoidal motor servo drives. Development in AC servo drive devices in the transmission field is progressing rapidly. Compared with DC servo motors, permanent magnet AC servo motors offer the following main advantages: 1. No brushes or commutators, resulting in reliable operation and low maintenance requirements. 2. Stator winding heat dissipation is relatively convenient. 3. Low inertia, making it easier to improve system responsiveness. 4. Suitable for high-speed, high-torque operating conditions. 5. Smaller volume and weight for the same power rating.

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