Starter motor armature manufacturer: What are the characteristics of the armature?

　　 Starter armature According to the manufacturer, whether it is a DC motor or an AC motor, and regardless of whether the windings are placed on the rotor or stator, they all belong to the armature windings placed in the iron core slots. Different winding connection methods result in different types and characteristics. To strengthen the mechanical fixation of the windings, the effective (straight) parts are placed in the slots. However, the ends are still ineffective parts, only serving as connectors.

　　The starter armature manufacturer believes that windings embedded in slots also bring some problems. First, in order to prevent tooth saturation, the air gap magnetic density must be limited, which limits the utilization coefficient of the motor. Second, the motor voltage cannot be too high. Third, the inductance of the coil increases, which is related to the saturation of the iron core. This slows down the response speed of the motor for electric drive and servo systems, and the nonlinearity of the inductance complicates the control system. Therefore, in the development of large steam turbine generators, especially with the advent of superconducting motors, as well as DC motors and control motors, slotless motors have emerged.

　　The starter armature manufacturer believes that slotless DC motors are mainly used for the control of DC traction motors and small DC motors. The iron core of a slotless motor is a cylindrical yoke, which is wound with an insulating layer or fitted with a prefabricated insulating tube. Then, the winding elements are evenly distributed on its surface, and then bundled with a glass fiber tape, etc. The whole is impregnated or filled with epoxy resin, and then cured to form a whole. The winding type and connection method are similar to those of general DC armature windings. Slotted armature windings are double-layered, while slotless armature windings can be double-layered or single-layered.

　　The starter armature manufacturer believes that the main characteristics of slotless armature windings are that their inductance and reactance EMF are much smaller than those of slotted windings, and all winding elements have obvious homogeneity in commutation parameters, which provides favorable electromagnetic conditions for commutation. Because the equivalent air gap (radial height of the winding plus air gap) of the slotless motor is quite large, the air gap magnetomotive force is much larger than the armature reaction magnetomotive force of the quadrature axis, so its magnetic stability coefficient and overload capacity are even greater than that of slotted armature motors with compensating windings.

　　The starter armature manufacturer believes that the superior structural characteristics of slotless armature windings make their heat dissipation much better than that of traditional armature windings. Moreover, due to the elimination of the tooth slots, there is greater freedom in the design aspects of selecting the electromagnetic load, main dimensions, armature structure, and how to use the armature winding ends to increase the main magnetic flux and torque. Since the tooth iron part of the armature can now also be wound, the effective area utilization rate is greatly improved, the radial size can be reduced, and the motor can develop in a slender direction.