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03-01

2023

Get to know brushless DC motor stators and rotors in one minute

The stator and rotor of a brushless motor are components of the motor. The two components can coordinate with each other through the action of the magnetic coil to convert electromagnetic energy information into mechanical energy. Simply put, the stator and rotor of a brushless motor are the rotating parts of the motor. Brushless DC motors use semiconductor switching devices to achieve electronic commutation, i.e., electronic switching devices replace traditional contact commutators and brushes. They have advantages such as high reliability, no commutation sparks, and low mechanical noise, and are widely used in high-end tape recorders, video recorders, electronic instruments, and automated office equipment. A brushless DC motor consists of a permanent magnet rotor, a multi-pole winding stator, and a position sensor. The position sensor detects the change in rotor position and switches the current in the stator windings in a certain order (i.e., it detects the position of the rotor magnetic pole relative to the stator windings and generates a position sensing signal at a specific position. After processing by the signal conversion circuit, it controls the power switching circuit and switches the winding current according to a certain logical relationship). The working voltage of the stator winding is provided by the electronic switching circuit controlled by the position sensor output. There are three types of brushless motor stator and rotor position sensors: photoelectric, magnetoresistive, and electromagnetic. In brushless DC motors using magnetoresistive position sensors, the magnetoresistive sensor components (

02-20

2023

How to check the condition of a brushless motor stator and rotor?

The stator and rotor of a brushless motor are important components of motors such as generators and starters. The stator is an important part of the motor. The stator and rotor of a brushless motor consist of a stator core, stator windings, and a frame. The main function of the brushless motor stator and rotor is to generate a rotating magnetic field, while the main function of the rotor is to be cut by electromagnetic lines in the rotating magnetic field to generate (output) current. The rotor is the rotating part of the motor. The motor consists of a rotor and a stator, used to achieve the conversion of electrical energy and mechanical energy, as well as mechanical energy and energy conversion devices. The motor rotor system is divided into two motor rotors and generator rotors. The function of the brushless motor stator and rotor is to rotate the drive shaft and provide electrical energy and mechanical energy conversion. The stator refers to the conductor in the magnetic field, the conductor is fixed, and the rotor refers to the electromagnetic coil, which moves relative to the conductor. This relative motion causes the magnetic lines of force to be cut, thus generating current in the stator coil. The stator and rotor of a brushless motor are made of iron cores and windings, and the windings are made of silicon steel and thick copper conductors. The conductors are insulated and coated with epoxy resin. The stator and rotor of a brushless motor are equivalent to conductors, and the rotor is equivalent to an electromagnet. After the rotor is energized, it is driven to rotate by the engine to form a rotating magnetic field model. Conversely, when the conductor cuts the rotating magnetic field, an induced electromotive force will be formed in the conductor.

02-09

2023

Introduction to the role of the stator and rotor in a brushless motor - collect this information!

The stator and rotor of a brushless motor consist of permanent magnets with a certain number of magnetic poles embedded in or on the surface of the iron core. Most permanent magnets are made of rare-earth permanent magnet materials with high coercivity, such as neodymium, iron, and boron, and high magnetic permeability and magnetic induction density. The rotor magnets are similar to those in brushed motors; both produce a sufficient magnetic field in the air gap of the motor. The difference is that the permanent magnets in brushed motors are mounted on the rotor, while those in brushless DC motors are mounted on the stator. The rotor system structure of brushless DC motors often adopts different surface-mounted magnets, also known as tile magnets, with radially magnetized tile-type permanent magnets bonded to the outer surface of the iron core. Through reasonable design, a square-wave air gap magnetic flux density can be obtained. What is the injection molding process for the stator and rotor of a brushless motor? Metal inserts are placed in the mold, and then BMC plastic is injected and heated to 160 degrees. The power of the motor should be selected according to the power required by the equipment, so that the motor operates under rated load as much as possible. Two points should be noted when selecting: (1) If the motor power is too small, a "small horse pulling a large cart" phenomenon will occur, causing the motor to be overloaded for a long time and damaging it.

01-30

2023

What are the components of a starter motor armature?

The control device of the starter armature includes an electromagnetic switch, a starter relay, and an ignition start switch, etc., among which the electromagnetic switch is made together with the starter armature. I. Electromagnetic switch 1. Structural characteristics of electromagnetic switch The electromagnetic switch is mainly composed of an electromagnetic iron mechanism and a motor switch. The electromagnetic iron mechanism is composed of a fixed iron core, a moving iron core, an attracting coil, and a holding coil. The fixed iron core is fixed, and the movable iron core can move axially in the copper sleeve. The front end of the movable iron core is fixed with a push rod, and the front end of the push rod is provided with a switch contact plate. The rear end of the movable iron core is connected to the fork through an adjusting screw and a connecting pin. The reset spring is arranged outside the copper sleeve to reset the movable parts, such as the movable iron core. 2. Working principle of electromagnetic switch When the directions of the magnetic fluxes generated by energizing the attracting coil and the coil are the same, their electromagnetic attractions overlap each other, and the moving iron core can be attracted to move forward. The pad at the front end of the push rod until the electrical switch contacts are connected to the motor main circuit. When the magnetic pain caused by the energization of the attracting coil and the coil is in the opposite direction, their electromagnetic attractions cancel each other out. Under the action of the reset spring, the movable iron core and other movable parts automatically reset, the pads and contacts are disconnected, and the motor main circuit is disconnected. II. Starting relay

01-10

2023

What is the manufacturing method for the starter armature structure?

The starter armature structure can increase the energization time of the starter and avoid the problem of short circuit caused by the ablation of the copper wire winding after the armature is energized for a long time, thus ensuring the safety of the circuit. The starter armature structure includes an armature shaft, an armature winding, an iron core and a commutator. The armature winding includes an end winding i arranged away from the commutator. The end winding i is provided with a U-shaped portion, and the U-shaped portion is provided with an insulating sleeve. The melting point of the insulating sleeve is higher than 200 ℃. The iron core is fitted on the armature shaft, and the iron core is provided with a winding slot i, and the armature winding is embedded in the winding slot i. An insulating piece i is set in the winding slot i to isolate the armature winding from the iron core and the edges of the components of the armature winding. The insulating piece i has an S-shape structure to wrap the edges of the components of the armature winding. The commutator is fitted on the armature shaft and is arranged near the end of the armature shaft. The commutator is provided with a winding slot ii. The armature winding also includes an end winding ii, which is arranged near the commutator and embedded in the winding slot ii. The end winding ii is composed of an inner ring layer and an outer ring layer, and an insulating element ii is arranged between the inner ring layer and the outer ring layer to isolate the inner ring layer and the outer ring layer. The clamping ring is also fitted at a position corresponding to the winding slot ii on the commutator. The insulating sleeve is made of glass fiber. Compared with the existing technology, this invention

01-03

2023

What are the structural hotspots of a starter armature?

The starter armature moves the entire armature through the magnetic force of the magnetic poles, causing the drive gear to mesh with the flywheel gear ring. The armature of the starter is offset from the magnetic pole by a certain distance under the action of the reset spring, and the commutator is relatively long. The starter housing is equipped with an electromagnetic switch. Its magnetizing coil is controlled by the starter switch S. The movable contact is the contact bridge. The upper end of the contact bridge is longer and the lower end is shorter, so the starter circuit can be connected in two stages. The starter has three magnetic field windings. Among them, the main magnetic field winding with fewer turns is made of flat copper bars, and the other two fine wire windings are the series auxiliary magnetic field winding and the parallel auxiliary magnetic field winding (also called the holding coil). The starter one-way clutch generally uses a friction plate clutch. The working process of the starter armature is divided into two stages. The series auxiliary excitation winding mainly works in the first stage, and in the second stage it is almost short-circuited due to being in parallel with the main excitation winding; the parallel auxiliary excitation winding works in both stages, which not only increases the magnetic force attracting the armature, but also limits the no-load speed. (1) Engagement When the starter switch S is turned on, the electromagnet generates suction to attract the contact bridge. However, because the pawl rests against the blank, the contact bridge can only close at the upper end, and the series and parallel auxiliary magnetic field winding circuits are turned on. The current circuit is:

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