• Source:
• Time of issue:2022-10-24 17:04
• Views:

(Summary description)Smart e-bikes are becoming increasingly popular in the market as they can detect the rider's riding force in real time and dynamically adjust the motor output in time for a relaxed driving experience on uphill or upwind. Smart e-bikes use fuzzy control and its core component is the Hall sensor, which uses a non-contact method to measure the bike's speed, direction of rotation and angle of rotation. The Hall sensors currently available in the market are generally low in the number of analogue signals collected (only 18 or 24 pulses per revolution), low in sensitivity and slow in response time, so it is essential to design Hall sensors with higher accuracy, faster response time and higher sensitivity. This paper gives the following research: 1. Scheme design This paper proposes a design method for a more accurate Hall sensor, designing a mid-axis speed sensor, which can generate 36 pulses per rotation of the mid-axis, while the traditional Hall mid-axis speed sensor can only generate up to 24 pulses per rotation of its mid-axis. This paper focuses on the detailed design and optimisation of the magnet, magnet support sleeve, housing, centre shaft and circuitry of the sensor, and through continuous experimentation, identifies the factors responsible for the cracking of the magnet during assembly, and analyses and improves the various defects in the housing during low pressure injection moulding and sealing, thus finding a method suitable for mass production with a yield of 98% or more. 2. This chapter analyses the factors that cause the magnet to crack during assembly, optimises the design of the magnet cracking phenomenon, optimises the sensor housing, investigates the defects that occur during low pressure injection, improves the low pressure injection process and optimises the design of the sensor air gap parameters. 3. This section presents a pilot study of the magnet support sleeve made of rubber, a pilot study of the magnet support sleeve made of PA66+GF30, a pilot study of the sensor housing and a pilot study of the low pressure injection moulding process for sealing the sensor. This sensor solution is an effective solution which provides excellent assistance to the rider. The system is designed to be highly accurate, generating 36 pulses per revolution of the central axis. The shorter response time for more precise control when starting and stopping the drive system, which is more sensitive to the individual's riding characteristics, makes this design solution worthy of consideration and replication.