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introduction：Yaskawa servo in the automatic control system，Used as an executive element，And has a small electromechanical time constant、High linearity、Starting voltage and other characteristics，The received electrical signal can be converted into angular displacement or angular speed output on the motor shaft。Divided into DC and AC servo motor two categories，Its main characteristics are，When the signal voltage is zero, there is no rotation，The speed decreases at a constant rate as the torque increases。Yaskawa electricThe inner rotor is a permanent magnet，Driver controlledU/V/WThree-phase electricity forms an electromagnetic field，The rotor rotates under the action of this magnetic field，At the same time, the encoder with the motor feeds back the signal to the driver，The drive compares the feedback value to the target value，Adjust the rotation Angle of the rotor。The accuracy of the servo motor is determined by the accuracy of the encoder。 The difference between AC servo motor and brushless DC servo motor in function
2017-09-27 Reading quantity 159
introduction：1、Structural model： Synchronous generators are the same as other types of rotary motors，It consists of two parts: a fixed stator and a rotatable rotor。Generally divided into rotary synchronous motor and rotary synchronous motor。 The structure model of the most commonly used transfield-type synchronous generator is given，The inner circle of the stator core is evenly distributed with the stator slots，Three phase symmetrical AC windings arranged according to certain rules are embedded in the slot。The stator of this synchronous motor is also called armature，The stator core and winding are also called armature core and armature winding。 The rotor core is fitted with a pair of magnetic poles made into a certain shape，An exciting winding is wound on the pole，When a direct current is applied，A polarized magnetic field will be formed in the air gap of the motor，Its called an exciting magnetic field(Also known as the main magnetic field、Rotor magnetic field)。 The air gap is between the inner
2017-09-27 Reading quantity 265
introduction：Principle of three-phase asynchronous motor When a symmetrical three-phase alternating current is passed into a three-phase stator winding，It produces a synchronous speedn1The rotating magnetic field rotates clockwise along the inner circular space of the stator and rotor。Due to the rotating magnetic fieldn1Rotational speed，The rotor conductor is stationary at first，Therefore, the rotor conductor will cut the stator rotating magnetic field and generate induced electromotive force（Sensing the direction of the electromotive force Right hand rule decision）。Because both ends of the rotor conductor are shorted by a short-circuit ring，Under the action of induced electromotive force，The rotor conductor will generate an induced current in the same direction as the induced electromotive force。The current carrying conductor of the rotor is in the stator The magnetic field is subject to the action of electromagnetic force（The direction of the force is determined by the left hand rule）。The electromagnetic force is genera
2017-09-27 Reading quantity 280
introduction：Three phase asynchronous motor parameter table (1)Model number：The type represents the type of motor、property、use、Structural and other features。It is often labeled on motorsFirst line on the nameplate，Mainly by product code、Specification code、Technical parameter code consists of three parts。For example, a motor model is“Y250M2-4”．The first Chinese pinyin letter represents the motor product code（See the following table）．YRepresentative asynchronous motor：The second item is an Arabic numeral250Indicated center heightH．Central height250mm：The third Chinese pinyin letter indicates the motor frame number．amongSFor short frame、MIt is a medium frame、LFor long engine base：The fourth Arabic numeral indicates the core length number．2expression2Number core length（The larger the number, the longer the core）；The last Arabic numeral indicates the number of magnetic poles，namely4expression2opposition-pole（The greater the number of magnetic poles．The lower the rated speed of the motor。For example, the motor speed i
2017-09-27 Reading quantity 258
introduction：The preload force must be appropriate，Too small can not guarantee no backlash drive，Too large will increase the driving torque，Efficiency reduction，Shortened life。The preload should not exceed the maximum axial load1/3。
2017-09-27 Reading quantity 653
introduction：In everyday life，Mechanical products are very common in life，Mechanical products bring great convenience to people，Like mechanical watches, the service life of such items is still very long，durable，Give people a high advantage，People can also benefit from it。
2017-09-27 Reading quantity 274
introduction：below，Small series to introduce you to the float type liquid level sensor、Float type liquid level sensor and static pressure type liquid level sensor what is the difference between these three kinds of liquid level sensor！
2017-09-27 Reading quantity 427
introduction：The principles of time-delay relays fall into three broad categories，Power-off delay power-off delay and delay between，Lets explain it in detail！
2017-09-27 Reading quantity 66
introduction：Temperature rise is the temperature difference between a Siemens single-phase motor and the environment，It is caused by the heating of the motor。The iron core of a running motor will lose iron when it is exposed to alternating magnetic field，Copper loss occurs when the winding is energized，There are other stray losses and so on。These will increase the temperature of the motor。On the other hand, the motor also dissipates heat。Equilibrium is reached when heat and heat are equal，The temperature no longer rises but stabilizes at a level。
2017-09-27 Reading quantity 255
introduction：The increment of displacement per unit time is the velocity。Velocity includes linear velocity and angular velocity，Corresponding to the wired speed sensor and angular speed sensor，We call them all speed sensors。The figure above shows the schematic diagram of the magnetoelectric speed sensor，A bridge circuit consisting of two reluctance elements and two resistors，The differential output signal is sent directly after the detection signal is taken outDCAmplification by amplifier。The working principle is when the rotating mechanism of the sensor rotates under the action of external driving，It spins the permanent magnet，The magnetic field passing through the Hall element will produce periodic changes，Causes the output voltage of Hall element to change，A stable pulse voltage signal is formed through subsequent circuit processing，As the output signal of the speed sensor。
2017-09-27 Reading quantity 183
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