Application of Insulating Materials in Motors

Application of insulating materials in motors:
1. Insulating material in the motor: a material that can prevent the passage of current, the volume resistivity is usually greater than 109Ω.cm
2. The role of insulating materials: Isolate the charged parts from the uncharged parts or the parts with different potentials, so that the current can flow according to a certain path.
3. Motor: electromagnetic mechanical equipment for energy conversion
4. Motor classification: transformer, DC motor, AC motor, control motor, pulse motor
5. The basic structure of the motor: the stationary part (stator): generates a magnetic field, forms a magnetic circuit, and is mechanically supported. Gap (air gap): an important part of the magnetic circuit to ensure the safe operation of the motor. Rotating part (rotor): induces electric potential, generates electromagnetic torque, and realizes energy conversion
Stator structure: machine base, main magnetic pole, commutation pole, end cover, brush device. Rotor structure: rotating shaft, armature core, armature winding, commutator.
Motor Insulation Materials
6. Armature winding: It is composed of a certain number of armature coils connected according to certain rules; it is the circuit part of the DC motor, and it is also a part that induces electromotive force and generates electromagnetic torque for electromechanical energy conversion.
7. The main insulation materials used in the manufacture of motors: conductive materials (windings, commutators, brushes), insulating materials (electrically separate the live parts from the grounding parts such as iron cores, machine bases, and live parts with different potentials) Magnetic materials (manufacturing various parts of the magnetic system such as iron core, machine base, etc.).
electrical insulation material
8. Motor insulation structure: inter-turn insulation, inter-layer insulation, ground insulation, and outsourcing insulation. There are three, filled insulation, liner insulation, commutator insulation.
Inter-turn insulation: inter-turn insulation of main pole coil and commutation pole coil, inter-turn insulation of armature coil, commutator sheet, inter-sheet insulation, insulation between turns of the same coil.
Insulation between layers; insulation between the layers of the layered flat-wound main pole coil, the front and rear end sections of the armature winding, the insulation between the upper and lower layers of the slot, and the insulation between the upper and lower layers of the coil.
Ground insulation: refers to the insulation between the windings of the motor and the base and other non-charged parts, the ground insulation of the main pole coil commutation pole coil, the armature winding ground insulation, and the commutator ground insulation. Isolate the live parts in the motor from the non-live parts such as the machine base and iron core, so as to avoid breakdown to the ground.
Outsourcing insulation: The insulation wrapped on the ground insulation mainly protects the ground insulation from mechanical damage and makes the entire coil strong and flat, and also plays a role in reinforcing the ground insulation.
Filled insulation: filling the gaps of the coil, so that the entire coil is firmly formed into a whole, reducing vibration, and the coil is shaped and smooth, which is beneficial to the insulation of the ground and the heat dissipation.
Gasket insulation: protects the insulation structure from mechanical damage during process operations.
Insulation of commutator: insulation between the commutator segments, insulation between the commutator segments and the ground, V-shaped mica ring and mica sleeve between the commutator segments and the pressure ring, multiple layers of high-quality shellac plastic mica.
9. Stator bar conductor insulation: row insulation, transposition insulation, transposition filling.
10. Insulation of hydro-generator rotor: inter-turn insulation, pole supporting plate, pole body insulation.
flexible copper clad laminate sheets

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