Temperature and Torque Measurements of Switched Reluctance Actuator with Composite or Laminated Magnetic Cores.

Soft magnetic composite (SMC) materials made of iron powder are more frequently used in construction of electric actuators and motors because of their advantages with respect to Fe-Si electric steel sheets and because they have almost no powder loss. The study deals with measurements of temperature and torque of a low-power rotary switched reluctance actuator, with reference to a commercial actuator and a prototype actuator characterized by stator and rotor cores made of soft magnetic composite materials. Further power loss analysis was also conducted.

Trends in folic acid supplementation during pregnancy - the effect on allergy development in children.

Introduction: The results of some previous studies suggested that maternal folate supplementation during pregnancy may contribute to allergy development in offspring.

Aim: This study was performed to examine the influence of maternal folic acid intake prior to and during pregnancy on the development of various types of allergy in children taking into account the timing and dosage of supplemented folate.

Material And Methods: The retrospective study was performed between 2010 and 2014 in 307 child-mother pairs (203 allergic children and 104 children without allergy symptoms, aged 2-72 months).

Impulse Magnetization of Nd-Fe-B Sintered Magnets for Sensors.

Magnetization of large Nd-Fe-B sintered permanent magnets is still challenging. This type of permanent magnet is electrically conductive, so impulse magnetization causes a flow of eddy currents which prevent magnetization of the whole volume of the magnet. The paper deals with the impulse magnetization of sintered Nd-Fe-B permanent magnets and shows a method for the determination of suitable parameters for the supply system.

Synchronous motor with hybrid permanent magnets on the rotor.

Powder metallurgy allows designers of electric motors to implement new magnetic circuit structures. A relatively new concept is the use of a magnet system consisting of various types of magnets on one rotor, for example sintered and bonded magnets. This concept has been applied to the design and manufacture of the four-pole rotor of a synchronous motor with 400 W power and a rotational speed of 1500 rpm.