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Zella motors are a type of motor that changes speed by altering the number of pole pairs, voltage, current, frequency, etc., to achieve higher performance. Due to their excellent performance, adjustable-speed motors are widely used in industries such as steel, power stations, cables, chemicals, petroleum, cement, textiles, printing and dyeing, papermaking, and machinery for stepless speed control of loads with constant torque or decreasing torque. They are particularly suitable for driving pumps and fans with significant flow variations, achieving good energy-saving results.

Zella motor mechanical characteristics

There are two methods for changing the direction of motor rotation: one is the armature reversal method, where the polarity of the field winding terminal voltage remains unchanged, and the motor reverses by changing the polarity of the armature winding terminal voltage; the other is the field winding reversal method, where the polarity of the armature winding terminal voltage remains unchanged, and the motor direction is changed by altering the polarity of the field winding terminal voltage. If the voltage polarity of both is changed simultaneously, the motor's rotation direction remains unchanged. Separately excited and shunt DC motors generally use the armature reversal method to achieve forward and reverse rotation. The reason separately excited and shunt DC motors should not use the field winding reversal method for forward and reverse rotation is that the field winding has many turns and high inductance. Reversing the field winding generates a large induced electromotive force, which can damage the switch and the insulation of the field winding. Series DC motors are suitable for using the field winding reversal method because the voltage across the armature is high, while the voltage across the field winding is low, making reversal easy; electric locomotives often use this method.

Zella motor mechanical characteristics

Motor electromagnetic torque: The electromagnetic torque of a three-phase asynchronous motor is generated by the interaction between the flux per pole φm of the rotating magnetic field and the rotor current I2. Since the rotor circuit is inductive, the rotor current I2 lags behind the rotor electromotive force E2. Therefore, the relationship between torque T, flux φm, and rotor current I2 is T = K TΦI 2 c o s Ψ 2 (1). In equation (1), KT is a constant related to the motor structure, cosΨ 2 is the power factor of the rotor circuit, and the unit of torque T is Newton-meter (N·m). From the above equation, it can be seen that torque T is proportional to F and also proportional to I 2 cosy 2. From the circuit analysis of the three-phase asynchronous motor, substituting equations (2), (3), and (4) into equation (1) yields another expression for torque. From equation (5), it can be seen that torque T is also proportional to the square of the phase voltage U1 of the stator winding, so changes in supply voltage significantly affect torque. Additionally, torque T is influenced by the rotor resistance R2. Mechanical characteristic curve: The curve representing the relationship between electromagnetic torque and slip ratio is the n=f(T) curve. Although the slip ratio s of an asynchronous motor reflects the motor speed n, it is not very intuitive or convenient for application. Therefore, mechanical characteristics are typically used to analyze related drive problems. Under constant supply voltage, the relationship between motor speed and electromagnetic torque is called the motor's mechanical characteristic. The n = f(T) curve of an asynchronous motor is derived from the T-s curve through coordinate axis transformation. When s = 0, n=1; when s=1, n=0. By taking speed n as the vertical axis and torque T as the horizontal axis, and rotating the T-s curve clockwise by 90°, the mechanical characteristic curve n = f(T) is obtained. The purpose of studying mechanical characteristics is to analyze motor operating performance, starting with a discussion of three torques on the mechanical characteristic curve. Rated torque TN: When the motor rotates at a constant speed, its output torque must balance the resisting torque, which is mainly the mechanical load torque T2. It also includes no-load loss torque (mainly mechanical loss torque) T0. Since T0 is very small and often negligible, therefore: T = T2+ T0 ≈ T2. Thus, the motor's electromagnetic torque T is approximately equal to the output mechanical torque T2 on the motor shaft. Where: P2 is the mechanical power output on the motor shaft, in Watts (W); the unit of torque is Newton-meter (N.m); the unit of speed is revolutions per minute (r/rnin). If power is expressed in kilowatts, commonly used in engineering, then: If the mechanical power output P2 on the motor shaft is the rated power P2N, then the output mechanical torque T2 of the motor is the rated torque TN. Maximum torque Tmax. It can be seen that maximum torque Tmax is proportional to U12 and independent of rotor resistance R2; sm is related to R2, and the larger R2 is, the larger sm becomes. The ratio of the motor's maximum torque Tmax to its rated torque TN is called the overload coefficient, denoted by λ. That is, λ=Tmax/TN represents the motor's short-term overload capability. Generally, λ for three-phase asynchronous motors is between 1.8 and 2.2, while for special motors used in metallurgy and lifting, λ is between 2.2 and 3. It should be noted that the motor at TN1. The ratio of the motor's starting torque Tst to the rated torque TN, Kst =Tst/TN, indicates the motor's starting capability. Generally, the Kst value for asynchronous motors is between 1. 4 and 2. 2. Motor operation analysis: When the load torque T2 carried by the motor is less than the starting torque Tst, the motor can start with the load. From point c to point b, the motor's torque increases with rising speed, causing the speed to increase rapidly. At point b, the torque reaches its maximum value Tmax. After passing point b, the motor's torque decreases as speed rises, but as long as the electromagnetic torque T is greater than the load torque T2, the motor speed continues to rise until T = T2, at which point the motor speed stabilizes. Therefore, the stable operating point of the motor lies at some point in the b and a interval of the n = f（T）curve. Hence, the ab region is called the stable operating region. The bc region is the unstable operating region. If the load suddenly increases, or the supply voltage suddenly drops such that T2>Tmax, the motor speed drops rapidly, entering the bc segment. The motor's electromagnetic torque decreases with the drop in speed, causing the motor to stop quickly. This phenomenon is called stalling. After stalling, the current in the motor immediately rises to several times the rated current. If there are no protective measures to cut off the power supply in time, the motor may be burned out.

Zella motor advantages

What are the advantages of this motor compared to others: 1, Precision: Achieves closed-loop control of position, speed, and torque; overcomes the step loss problem of stepper motors; 2, Speed: Good high-speed performance, with general rated speeds reaching 2000 to 3000 rpm; 3, Adaptability: Strong overload resistance, capable of handling loads three times the rated torque, especially suitable for applications with instantaneous load fluctuations and requirements for rapid starting; 4, Stability: Smooth operation at low speeds, without the stepping phenomenon similar to stepper motors. Suitable for applications requiring high-speed response; 5, Responsiveness: Short dynamic response time for acceleration and deceleration, generally within tens of milliseconds; 6, Comfort: Significantly reduced heat generation and noise. Simply put: ordinary motors seen in daily use continue to rotate for a while due to inertia after power is cut off, then stop. Servo motors and stepper motors stop and start immediately, with extremely fast response. However, stepper motors suffer from step loss. The application areas for servo motors are extensive. Any application requiring a power source and precision likely involves servo motors, such as machine tools, printing equipment, packaging equipment, textile equipment, laser processing equipment, robots, and automated production lines, which have relatively high requirements for process precision, processing efficiency, and operational reliability.

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