Motor in all walks of life will be used, in ₽$₽all kinds of motor, asynchronous motor is the π‌∏​most common kind of power e‌←←quipment, in some occasions will also see the uπ→se of synchronous motor. The ≥ same AC motor, what is th ¥e difference between assyn"≠₹chronous motor and synchronous motor? To£ day by this question and friends to discuss the dα✔÷≠ifference between these two©↔ motors.
Let's start with the most widely used as↑✘♠λynchronous motors. First, we will analyze the ba ✔‌sic structure of the asynchrono₽εΩus motor. In fact, the structure of th↔✔♥ e asynchronous motor is relatively ÷©δ↑simple, mainly including the stator part and₹☆ the rotor part. Motor at the time of ∑§π•start, there will be two so-called spe↑φ¶ed, a speed is we use the eyes can∞>÷'t see the speed, the speed we call it∞£₽ electromagnetic field rotation speed, it is∞≤ the motor into three phase ac, formed in tφ<$he motor stator magnetic field speed, gener≈₹ally expressed with n0, the n0 we also calΩ↑"¥l synchronous speed, the speed  §not only with the power fre ★quency, but also with the m♣¶otor stator winding formed by the magnet≈γic pole logarithm. For example, we use a→' three-phase alternating current, whose oper∑€™©ating frequency is 50 HZ, if the magnetic pole✔‌ log of the motor is 1. Then according t∑ o formula: n0=60f / p=60x50 /∞¶÷ 1 = 3000 r/min, if the magnetic pole≤λδ log of the motor is 2, then n0=60÷≠✔f / p=60x50 / 2 = 1500 r/min. These speed we canσ&'t see, we can see the motor speed is the mot∞≤★or rotor speed, the speed •♣>δis due to the rotor in the rotating magnet←₩✘¶ic field, the rotor in the rot∑§←or, the induction of the currenπ♣∏→t in the rotating magnetic field a♠•λnd the action of the format→∏φion of the rotation, so from the two spee÷‌d time, is the rotation of the stator >'÷and then the rotation of the rotor, we can also ∏βunderstand the asynchronous motor of the rot​✔£¥or speed always behind the speed of the s♠±₹σtator magnetic field, so we call this m∑✘otor is called asynchronous motor.
We know that the synchrono$€≥$us motor is rarely used in o©εΩγccasions, its structure can also be d≥λ↕ivided into the rotating part ≤• and the non-rotating part, the r™αα©otating part of the rotor we call it £÷ →the magnetic pole, the non-rotating part of the ‍₩stator we call it the armature.¶&​ So the so-called synchronization is the♣×πφ rotating magnetic field f☆'£↔ormed by the child n0 and the rotor speed n ₹ φis no speed difference, so their speed i£§s equal, that is, n0=n=60f / p, thi∞✔αs is the origin of the name of ‌♣§the synchronous motor.
Since the two rotation speed ↕§¶ is the same, there is no speed difference, thenש how does it rotate? This is from thσ♣¶e structure of the synchronous motor, just sa ₹ε¶id the stator of the synchronous motor is•₽ the armature, the rotor is a magnet©→≥ic pole, it is in the stator into the t☆&≈πhree-phase alternating current, in the rotor <∏also to the current, the current is direct☆>♣♥ current. In this way, the stator of the sy∞±←©nchronous motor will produce a rotating ≤φ magnetic field, so the rotor will foγ↓σ↑rm a constant magnetic field because of the dire≠÷σct current, and the two magnetic fie♥↔•lds will attract each other, so the rotor of ₩γthe synchronous motor will ±αbe rotated by the action of electromagnet•☆÷ic force.
I just made a simple comparison of the ♦♥€≈asynchronous motor and the synch✔™&≥ronous motor, from the comparison we ✘÷ can see that the synchronous motor i☆λ‌πs more than asynchronous