电机板块12月30日涨4.66%，方正电机领涨，主力资金净流入8.6亿元

Group 1 - The electric motor sector experienced a significant increase of 4.66% on the trading day, with Fangzheng Electric leading the gains [1] - The Shanghai Composite Index closed at 3965.12, showing no change, while the Shenzhen Component Index rose by 0.49% to 13604.07 [1] - Fangzheng Electric's stock price rose by 9.98% to 15.43, with a trading volume of 1.36 million shares and a transaction value of 1.978 billion yuan [1] Group 2 - The electric motor sector saw a net inflow of 860 million yuan from main funds, while retail investors experienced a net outflow of 453 million yuan [2] - The trading data indicates that major stocks like Wolong Electric Drive and Dayang Electric also saw notable price increases, with respective gains of 7.08% and 5.22% [1][2] - The stock performance of various companies in the electric motor sector varied, with some experiencing declines, such as Zhongdian Electric, which fell by 1.13% [2]