Dyadic Systems motor, German Dyadic Systems model, Dyadic Systems price

Dyadic Systems motor is a device that converts electrical energy into mechanical energy. It uses energized coils (i.e., stator windings) to generate a rotating magnetic field that acts on the rotor (such as a squirrel-cage closed aluminum frame) to form electromagnetic rotational torque. Motors are classified into DC motors and AC motors based on the power supply used. Most motors in power systems are AC motors, which can be synchronous motors or asynchronous motors (the speed of the motor's stator magnetic field does not remain synchronized with the rotor's rotational speed). The motor mainly consists of a stator and a rotor. The direction of motion of current-carrying conductors under force in a magnetic field is related to the direction of the current and the direction of magnetic field lines (magnetic field direction). The working principle of the motor is the force exerted by the magnetic field on the current, causing the motor to rotate.

Dyadic Systems motor braking methods

Motor electrical braking methods include: dynamic braking, plugging braking, and regenerative braking. (1) During dynamic braking, the three-phase AC power supply to the motor is cut off, and DC power is supplied to the stator windings. At the instant the AC power is cut off, due to inertia, the motor continues to rotate in the original direction. This method is characterized by smooth braking, but requires a DC power source; for high-power motors, the cost of the required DC equipment is high, and the braking force is small at low speeds. (2) Plugging braking is divided into load plugging braking and power supply plugging braking. Load plugging braking is also known as load reversal plugging braking. This torque causes heavy loads to descend slowly at a stable speed. The characteristics of this braking are: the power supply does not need to be reversed, no special braking equipment is required, and the braking speed can be adjusted. However, it is only applicable to wound-rotor motors, where a large resistance must be connected in series in the rotor circuit to make the slip greater than 1. In power supply plugging braking, when the motor needs to be braked, simply swap any two phase power lines to reverse the rotating magnetic field for rapid braking. When the motor speed reaches zero, the power supply is immediately cut off. The characteristics of this braking are: fast stopping, strong braking force, and no need for braking equipment. However, during braking, the high current and large impact can easily cause the motor to overheat or damage components in the transmission part. Regenerative braking, also known as feedback braking, occurs when the motor's speed exceeds the synchronous speed of the rotating magnetic field under the action of a heavy load (e.g., when a crane motor lowers a load). At this time, induced current is generated in the rotor conductors, producing a counter-rotating torque under the action of the rotating magnetic field. However, since the motor speed is high, a speed-changing device is needed for deceleration.

Dyadic Systems motor classification

The vibration of the vibrating body is generated by two sets of excitation systems, and its vibration form is called composite vibration. There are generally two forms: dual-frequency composite and dual-amplitude composite. Certain vibration screening equipment with special performance uses two vibration motors of different models and speeds, installed at the feed end and discharge end of the screening machinery, respectively. This causes the feed end to exhibit large-amplitude, low-frequency vibration, while the discharge end exhibits small-amplitude, high-frequency vibration. The two vibrations overlap in the middle of the screening machinery, enabling more effective screening. If the projection of the vibration trajectory of the vibrating body on the horizontal plane is a circle or an ellipse, its vibration form is called rotary vibration. Rotary vibration can be further divided into three forms: planar rotary vibration, vortex rotary vibration, and complex rotary vibration. When the projection of the vibration trajectory of the vibrating body on the vertical plane is a horizontal straight line, its vibration form is called planar rotary vibration; when the projection is an inclined straight line, its vibration form is called vortex rotary vibration; when the projection is a circle or an ellipse, its vibration form is called complex rotary vibration. Usually, vibration machinery excited by vertical vibration motors produces rotary vibration, and the specific vibration form depends on the angle between the excitation blocks at both ends of the vertical vibration motor. Alternatively, two horizontal vibration motors can be installed on both sides of the vibration equipment with their shafts set at a specific angle, causing the vibration machinery to also produce rotary vibration.

Dyadic Systems 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. Therefore, changes in power supply voltage have a significant impact on torque. In addition, torque T is also affected by the rotor resistance R2. Mechanical characteristic curve: The relationship curve between electromagnetic torque and slip ratio is the n=f(T) curve. Although the slip ratio s of an asynchronous motor can reflect the speed n of the motor, it is not very intuitive and is inconvenient for application. Therefore, mechanical characteristics are usually used to analyze related drive problems. Under constant power supply voltage, the relationship between the motor speed and electromagnetic torque is called the mechanical characteristic of the motor. The n = f(T) curve of an asynchronous motor, the T-s curve, is obtained through coordinate axis transformation. When s = 0, n=1; when s=1, n=0. Taking speed n as the vertical axis and torque T as the horizontal axis, rotating the T-s curve clockwise by 90° yields the mechanical characteristic curve n = f(T). The purpose of studying mechanical characteristics is to analyze the operating performance of the motor. First, three torques are discussed 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. In addition, it includes no-load loss torque (mainly mechanical loss torque) T0. Since T0 is very small and can often be ignored, therefore: T = T2+ T0 ≈ T2. Thus, the electromagnetic torque T of the motor is approximately equal to the output mechanical torque T2 on the motor shaft. That is, in the formula: P2 is the mechanical power output on the motor shaft, with the unit Watt (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 P2 output 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 the maximum torque Tmax is proportional to U12 and independent of the rotor resistance R2; sm is related to R2, and the larger R2 is, the larger sm is. The ratio of the motor's maximum torque Tmax to the 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, the λ of three-phase asynchronous motors is between 1.8 and 2.2, while for special motors such as metallurgical and lifting motors, λ is between 2.2 and 3. It should be pointed out that the motor at TN1. The ratio of the motor's starting torque Tst to the rated torque TN, Kst =Tst/TN, represents the motor's starting capability. Generally, the Kst value of 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 load. From point c to point b, the motor's torque increases with rising speed, prompting a rapid increase in motor speed. At point b, the torque reaches its maximum value Tmax. After passing point b, the motor's torque decreases as speed rises. However, 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 is located at a certain point in the b–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 power supply voltage suddenly drops such that T2>Tmax, the motor speed rapidly decreases, 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 stall. 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.

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