The traditional linear motor position detection accuracy heavily relies on the accuracy of sensors such as gratings, magnetic grids, and capacitive grids, and the installation accuracy and cost of sensors are also high. Based on the magnetic field analysis method, the influence of different permanent magnet shapes on linear Hall is analyzed, and the relationship between the magnetic field electrical angle and position at different detection distances is obtained. On this basis, a bread shaped permanent magnet structure that can achieve precise position detection is proposed, and a linear motor position feedback experimental platform is built based on complex programmable logic devices (CPLD) to achieve high-precision position detection of linear motors. The experimental results show that the use of Hall sensor induction designed bread shaped magnetic steel for linear motor position detection has the advantages of small installation method impact and high system reliability. The speed fluctuation of the linear motor during testing is within 5%, and the repeatability accuracy is 1.54 μm.