This low inductance imposes stringent current regulation demands for the inverter to obtain acceptable current ripple. The use of ironless stator structure in present high power PM motors (several tens of kWs) reduces the inductance even further (< 100 H). Multilevel DC Link Inverter for Brushless Permanent Magnet Motors with Very Low Inductanceĭue to their long effective air gaps, permanent magnet motors tend to have low inductance. TYPE OF REPORT & PERIOD COVERED Progress Re rSimulation and Performance of Brushless DCPrgesRpt Motor Actuators 111 PERFORMING ORG. r * N NAVAL POSTGRADUATE SCHOOL Monterey, California DTIC FEB4 1986 SIMULATION AND PERFORMANCE OF BRUSHLESS DC.S. Brushless DC Motor Power Conditioner for a Cruise Missile Fin Control.8217. MacMillan, P.M., "A CSMP Commutation Model for Design Study of a ’. Simulation and Performance of Brushless DC Motor Actuators.Ĥ. In another embodiment, the motor comprises two ironless stators and pairs of rotors mounted on opposite sides of the stators and driven by counterrotating shafts. Two different sets of bearings support the first and second shafts. The second shaft comprises a hollow tube having a central bore in which the first shaft is disposed. A first shaft is connected to the first rotor and a second, concentric shaft is connected to the second rotor, and a drive unit causes rotation of the two shafts in opposite directions. Each of the rotors includes an annular array of permanent magnets embedded therein. In one embodiment, the motor comprises four substantially flat stators in stacked relationship, with pairs of the stators axially spaced, each of the stators comprising a tape-wound stator coil, and first and second substantially flat rotors disposed between the spaced pairs of stators. Major advantages of controller are size, weight, and power consumption can be made less than other brushless-dc-motor controllers.ĭisc rotors with permanent magnets for brushless DC motorĪ brushless dc permanent magnet motor drives an autonomous underwater vehe. Controller includes commutation-logic and associated control circuitry, power supply, and inverters containing power transistors. Generic circuit performs commutation-logic and power-switching functions for control of brushless dc motor. Integrated-Circuit Controller For Brushless dc Motor As a result, it is shown that magnet thickness, teeth surface width, and rotor back yoke thickness are the most important geometrical dimensions of BLdc motor in terms of irreversible magnet demagnetization. The nonlinear analysis of a permanent magnet is added to 2D FEM to consider irreversible demagnetization. In this paper, we deal with the effect of design variables on irreversible magnet demagnetization in BLdc motor through the modeling approach using a two-dimensional finite-element method (2D FEM). So, irreversible magnet demagnetization occurs due to the external demagnetizing field by these currents. The large demagnetizing currents in brushless dc (BLdc) motor are generated by the short-circuited stator windings and the fault of a drive circuit. The motor can then operate as a brushless dc motor.Įffect of design variables on irreversible magnet demagnetization in brushless dc motor The rings are then cooled to 77 K to trap the flux in the rotor. The stator of the trapped flux motor will impress a magnetic field in the steel rotor poles with warm HTSC bulk rings. The trapped flux brushless dc motor has been built and is ready to test melt textured bulk HTSC rings that are currently being prepared. A copper field winding version of the homopolar dc motor has been tested while waiting for 575 A turn HTSC coils. In order to maximize torque in the homopolar dc motor, an iron magnetic circuit with small air gaps gives maximum flux for minimum Ampere turns in the field. The HTSC field windings of the homopolar dc motor are designed to operate at 1000 A/sq cm in a 0.010-T field. They are a homopolar dc motor that uses HTSC field windings and a brushless dc motor that uses bulk HTSC materials to trap flux in steel rotor poles. Two motors have been designed and built for use with high-temperature superconductor (HTSC) materials. Homopolar dc motor and trapped flux brushless dc motor using high temperature superconductor materials
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |