Patent ID: 9711245
Date: 2017-07-18
CPC Classifications: G21C,H02K,Y02E

Claim:
1. A magnetic jack type control element drive mechanism for precision position control of a control element assembly, wherein the magnetic jack type control element drive mechanism is a 4-coil type control element drive mechanism, the magnetic jack type control element drive mechanism comprising an upper motor assembly and a lower motor assembly which drive a control element up and down along a control element drive shaft, wherein the magnetic jack type control element drive mechanism satisfies the following conditions: wherein D1 represents a lift gap of the upper motor assembly; D2 represents a lift gap of the lower motor assembly; D3 represents a distance between tips of adjacent teeth of the control element drive shaft; D4 represents a gap between an upper latch constituting the upper motor assembly and a lower latch constituting the lower motor assembly; P represents a pitch indicating a distance the control element drive shaft ascends or descends when operating the upper motor assembly or the lower motor assembly; and D5 represents a margin which is a separation space between the teeth and the upper latch or the lower latch when the upper latch or the lower latch is inserted into the teeth of the control element drive shaft.