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09-05

2022

The function of a DC motor armature

The armature is a crucial component in an electric motor, playing a central role in the conversion between mechanical and electromagnetic energy. In a generator, it is the component that generates the electromotive force, such as the rotor in a DC motor and the stator in a DC motor. In a motor, it is the component that produces the magnetic force, such as the rotor in a DC motor. The armature is the component in an electric motor that contains the coils, which move relative to the electromagnetic field. In a generator, the rotation of the coils generates an induced current, producing electricity. In a motor, the energized coils are subjected to Ampere's force in the magnetic field, causing rotation. A DC motor or related equipment can be described from either a mechanical or electrical perspective. Although distinctly separate, these two terminologies are often used interchangeably or in combination. This can lead to confusion when using hybrid devices such as brushless DC motors or when communicating between personnel accustomed to different equipment configurations. In most generators, the field magnet rotates and is part of the rotor, while the armature is stationary and part of the stator.

08-22

2022

Design rules for automotive armatures

Automotive armature manufacturers indicate that single-layer windings are not suitable for large-capacity motors, and small-capacity motors should not be double-layered. The magnetic flux density of the motor core should not be too high or too low. When the frequency and thickness of the silicon steel sheet core material are constant, the iron loss depends on the magnetic flux density. If the magnetic flux density is too high, the iron loss increases, and the motor efficiency decreases. The increased heat from the iron core increases the motor temperature, and the increased excitation power increases the motor power factor, so the magnetic flux density of the core should not be too high. Try to avoid excessive saturation of the magnetization curve. If the magnetic density is too low, it will increase the amount of motor material used, increasing the cost. The rotor teeth are narrow, the magnetic density is high, the slot entry wire is large, that is, the automotive armature slots are large. Automotive armature manufacturers indicate that due to poor air conduction, there are many gaps in the slots, affecting the coils and easily damaging the heat dissipation of the insulation material, accelerating the increase in motor temperature. The slot fill factor of the motor slots cannot be too high or too low. Usually, the slot fill factor for low-speed motors is 75% to 85%, which can effectively prevent the enamelled wire from loosening in the slots. The design of the motor rotor slot shape should use parallel trapezoidal recesses as much as possible, and the edges of the recesses should not have sharp corners. Try to use a circular bottom recess, because the circular slot is filled with aluminum, which is easy to injection mold and the stator chip is easy to insert. The coil current density should not be...

08-17

2022

How to identify automotive armature windings?

The armature winding of an automobile is the heart of the motor. Different motors, manufacturers, and processing technologies correspond to different winding styles. Different winding styles are chosen to achieve specific characteristics, such as simple structure, easy manufacturing and maintenance, and safe and reliable operation. The automobile armature winding, like the AC motor winding, has a significant potential difference between the edges of each coil for a specific number of conductors. It should save non-ferrous metals and insulating materials as much as possible, but it has unique characteristics. Through the connector between coils, the connection relationship must ensure good conversion. I. Characteristics and coil pitch of automobile armature winding The characteristics of automobile armature winding are usually represented by the number of slots, the number of coils, the number of commutator segments, and various coil pitches. Each coil has two coil sides, and each commutator segment connects coil sides and coil sides, so the number of coils S must be equal to the number of commutator segments K (for example, S=K). 1. One pitch y1 The distance between the two coil sides of each coil intersecting the armature surface is called the back coil pitch or one coil pitch of the winding, represented by the number of virtual slots intersected. 2. Two pitches y2 In two coils connected by the same translation layer section, the distance between the bottom coil side of one coil and the top coil side of the other coil from the armature surface is called the front coil pitch or two coil pitches,

08-11

2022

Induced electromotive force and current of automotive armature windings

The basic understanding is that when a current flows through the armature winding in a magnetic field, a force acts on the winding. A more advanced understanding is that when a current flows through the winding in a magnetic field, another magnetic field is generated, and the interaction between the two magnetic fields produces torque. From an electron's perspective, the current experiences a force in the magnetic field. The latter understanding is that two magnetic fields interact with each other. Generally understood as a magnetic field that generates induced electromotive force, and the current in the winding generates another magnetic field, and the interaction between the two magnetic fields generates torque. However, if the two are combined into one magnetic field, how this magnetic field generates torque needs to understand the tensor law. The magnetic force that generates the armature induced electromotive force is called the air gap magnetic flux line, and the magnetic chain is called the air gap magnetic flux line. The air gap magnetic flux line and the induced armature will reduce the frequency relationship, thereby reducing the pi/2 phase relationship. This is a very clear and measurable physical quantity. The relationship with the armature winding current is also obvious. There are two main types of flowing armature windings, used in DC motors and AC motors respectively. The armature consists of an armature core and an armature winding. The armature winding is the circuit part of a DC motor, and is the part that converts electrical energy by generating induced electromotive force and electromagnetic torque (a generator is the part that converts mechanical energy into electrical energy). The armature core is the electric

08-05

2022

The function of an automotive armature

The automotive armature is a core component in the process of converting mechanical energy and electrical energy in a motor. For generators, it is the component that generates electromotive force, such as the rotor and stator of a DC generator and the stator of an AC generator. For motors, it is the component that generates electromagnetic force, such as the rotor and stator of a DC motor. The automotive armature is the component of the motor that has coils, and these coils move relative to the magnetic field. In a generator, the rotating coils under force generate an induced electromotive force, thus generating electricity. In a motor, the coils are subjected to Ampere's force in the magnetic field, causing them to rotate in the magnetic field. In most generators, the field magnet is part of the rotating component, and the armature is stationary, part of the stator. Motors and generators can be composed of a stationary armature and a rotating magnetic field or a rotating armature and a stationary magnetic field. Permanent magnets or the polarized parts of electromagnets and the moving iron parts of solenoids (especially when the latter are used as switches or relays) can also be considered armatures. Composition of an automotive armature: Automotive armature windings are divided into two main categories: DC armature windings and AC armature windings. They are used in DC motors and AC motors respectively. The automotive armature consists of an armature core and armature windings. The armature windings are the circuit part of the DC motor, formed by...

08-01

2022

P-gear armature: What is an armature

The armature manufacturer states that motors play a key and crucial role in the process of realizing the mutual conversion of mechanical energy and electrical energy. For generators, it is the component that generates electromotive force, such as the rotor in a DC generator and the stator in an AC generator; for motors, it is a component that generates electromagnetic force, such as the rotor in a DC motor. The armature manufacturer states that the armature is the relative motion of the coil relative to the magnetic field of the coil-carrying component in the motor. In a generator, an induced electromotive force is generated in the forced rotating coil to generate electricity. In a motor, the energized coil is subjected to the Ampere force in the magnetic field, causing it to rotate in the magnetic field. In the mid-19th century, the term "armature" was early used for inductors, i.e., holders of magnets. Part of an alternator or related equipment can be represented by any mechanical or electrical aspect. Although these two sets of terms are clearly separated, they are often used interchangeably, or a combination of mechanical and electrical terms is included. This can cause confusion when using composite motors such as brushless alternators, or when talking to people accustomed to using different configurations of motors. In most generators, the field magnet is rotating and is part of the rotor, while the armature is stationary and is part of the stator. Motors and

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