The present disclosure includes memory devices and systems having memory cells, as well as methods for operating the memory cells. A combination of numbers of the claw-pole pieces and the diagonal-flow-type blades is determined to suppress an interference of wind noises caused by the claw-pole pieces and the diagonal-flow-type blades during operation, such that one of the numbers of the claw-pole pieces and the diagonal-flow-type blades is not divisible by the other and both numbers have no common divisor other than one. Also connected to the frame are a plurality of leads which extend within the opening toward the die pad.