EMG Elettromeccanica motor Germany EMG Elettromeccanica model EMG Elettromeccanica price

EMG Elettromeccanica motors convert electrical pulse excitation signals into corresponding discrete angular or linear displacement control motors. These motors move one step for each input electrical pulse, hence they are also called pulse motors. They are micro-special motors that convert electrical pulse signals into angular displacement to control rotor rotation. They serve as actuators in automatic control devices. For each input pulse signal, the stepper motor advances one step, hence it is also called a pulse motor. Stepper motors are widely used in peripheral equipment of digital computers, as well as printers, plotters, and disk drives. The drive power supply for stepper motors consists of a variable-frequency pulse signal source, a pulse distributor, and a pulse amplifier, which provide pulse current to the motor windings. The operating performance of a stepper motor depends on the good coordination between the motor and the drive power supply. The advantages of stepper motors include no cumulative error, simple structure, convenient use and maintenance, low manufacturing cost, and high ability to drive load inertia. They are suitable for small and medium-sized machine tools and applications with low speed and precision requirements. The disadvantages are lower efficiency, significant heat generation, and occasional "step loss".

EMG Elettromeccanica motor mechanical characteristics

Motor electromagnetic torque: The electromagnetic torque of a three-phase asynchronous motor is generated by the interaction between the magnetic 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, magnetic 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, and cosΨ 2 is the power factor of the rotor circuit. 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 affected 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 can reflect the speed n of the motor, it is not very intuitive and is inconvenient to apply. Therefore, mechanical characteristics are usually used to analyze related driving problems. Under constant power supply voltage, the relationship between 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 derived through coordinate axis transformation. When s = 0, n=1; when s=1, n=0. Taking speed n as the vertical coordinate and torque T as the horizontal coordinate, 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, for three-phase asynchronous motors, λ is between 1.8 and 2.2, while for special motors such as metallurgical and hoisting 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 value of Kst 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 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 with rising speed. 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 and a region 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.

EMG Elettromeccanica motor cooling method

Motor cooling methods include: 1) Cooling: During energy conversion, a small portion of losses in the motor is always converted into heat. This heat must be continuously dissipated through the motor housing and the surrounding medium. This process of heat dissipation is called cooling. 2) Cooling medium: A gaseous or liquid medium that transfers heat. 3) Primary cooling medium: A gaseous or liquid medium with a temperature lower than that of a specific motor component. It comes into contact with this component and carries away the heat released by it. 4) Secondary cooling medium: A gaseous or liquid medium with a temperature lower than that of the primary cooling medium. It carries away the heat released by the primary cooling medium through the outer surface of the motor or a cooler. 5) Final cooling medium: The final medium to which heat is transferred. 6) Ambient cooling medium: The gaseous or liquid medium in the environment surrounding the motor. 7) Remote medium: A medium located far from the motor, which absorbs heat from the motor and discharges the cooling medium to a remote location through inlet and outlet pipes or channels. 8) Cooler: A device that transfers heat from one cooling medium to another while keeping the two cooling media separated.

EMG Elettromeccanica motor working principle

The motor is a rotating motor powered by a single-phase AC power supply, with a single-phase stator winding. When connected to single-phase AC power, it generates an alternating pulsating magnetic field in the air gap between the stator and rotor. Therefore, a single-phase asynchronous motor cannot self-start. In AC motors, when AC current passes through the stator winding, an armature magnetomotive force is established, which has a significant impact on the motor's energy conversion and operating performance. Therefore, when a single-phase AC winding is supplied with single-phase AC, it produces a pulsating magnetomotive force. This magnetomotive force can be decomposed into two rotating magnetomotive forces with equal amplitude and opposite speeds, thereby establishing forward and reverse rotating magnetic fields in the air gap. These two rotating magnetic fields cut the rotor conductors, inducing electromotive forces and currents in the rotor conductors respectively. The interaction between this current and the magnetic field produces positive and negative electromagnetic torques. The forward electromagnetic torque attempts to rotate the rotor forward; the reverse electromagnetic torque attempts to rotate the rotor backward. The superposition of these two torques is the resultant torque that drives the motor. Regardless of whether it is the forward or reverse rotating magnetic field, their magnitude relationship with the slip ratio is the same as that of a three-phase asynchronous motor. If the motor speed is n, then for the forward rotating magnetic field, the slip ratio is: s+=(n1-n)/n1=s. For the reverse rotating magnetic field, the slip ratio is: s-=（-n1-n)/-n1=s. From the T-s curve of the single-phase asynchronous motor, the main characteristics are: (1) n=0, s=1, T=T++ T- =0, indicating that the single-phase asynchronous motor has no starting torque. Without other measures, the motor cannot start. (2) When s≠1, T≠0, T has no fixed direction; it depends on the sign of s. (3) Due to the existence of reverse torque, the resultant torque is reduced, so the overload capability of single-phase asynchronous motors is lower. Working principle of capacitor-split-phase starting: During startup, switch K closes, causing the phase difference between the two winding currents I1 and I2 to be approximately 90°, thereby generating a rotating magnetic field and starting the motor. After normal rotation, the centrifugal switch opens, disconnecting the starting winding. Working principle of shaded-pole single-phase motor: After current is applied to the stator, part of the magnetic flux passes through the short-circuit ring, inducing a current in it. The current in the short-circuit ring opposes changes in magnetic flux, causing a phase difference between the magnetic flux in the part with the short-circuit ring and the part without it. This forms a rotating magnetic field, causing the rotor to turn. In the T-s curve of the single-phase asynchronous motor, the motor's rotation direction is clockwise. This is because the magnetic flux in the part without the short-circuit ring leads the magnetic flux in the part with the short-circuit ring.

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