31. All rotating electric machines have an equivalent linear electric machine where stator moves along a straight line instead of rotating. 32. Larger permanent magnet electric machines ( that can operate as motors or alternators ) can achieve today much higher efficiencies. 33. ICE-CREAM ( Undated ) _ For homemade ice cream fiends who want fast gratification, electric machines may be the answer. 34. Doubly fed electric machines use the slip rings to supply external power to the rotor circuit, allowing wide-range speed control. 35. All rotating electric machines have an equivalent linear electric machine where stator moves along a straight line instead of rotating. 36. Electric machines come in two basic magnet field pole configurations : " salient-pole " machine and " nonsalient-pole " machine.37. Sheet metal of iron and other materials with high magnetic laminated steel cores, has applications in transformers and electric machines . 38. The average was 132 parts per billion for rinks with gasoline machines and 37 ppb for those with electric machines . 39. Currently, more than 60, 000 large electric machines produced by the company are being operated in 52 countries of the world. 40. Produces far better results than many an electric machine . talk ) 15 : 37, 22 November 2008 ( UTC ) PW