Motor rotor system

Abstract

The invention discloses a motor rotor system, which comprises a revolving shaft (1), a rotor core (2), a permanent magnet (3), a magnet ring support (4) and a magnet ring (5), wherein the rotor core is the arranged on the revolving shaft (1); the permanent magnet (3), the magnet ring support (4) and the magnet ring (5) are arranged on the rotor core (2); the magnet ring (5) is sleeved on the magnet ring support (4); and the magnet ring support (4) is positioned on one side of the rotor core (2) and connected with an end face of the rotor core (2). The motor rotor system has the advantages that: the main field corresponds to the induced field of the rotor accurately; the motor rotor system is high in consistency, is suitable for batch production, has a simple structure, and is convenient to install; and sine wave driving control mode with a position sensor can be implemented.

Description

Technical field: [0001] The invention relates to a motor rotor system. Background technique: [0002] At present, brushless DC motors use position sensors (Hall elements) to measure the position of the rotor so that the motor controller can issue commutation commands in time. Now there is a sine wave control method with a position sensor. In this control mode, the main rotor of the motor The magnetic field uses a strong magnetic field, and the control drive signal has higher requirements for the consistency of the motor's back EMF and the Hall output signal. If the consistency is not good, it will cause the program used for one motor to be used on another. In case of abnormal phenomenon, the noise and vibration of the motor will increase, the efficiency will decrease, and the unique advantages of the sine wave motor will be lost. In severe cases, the motor will vibrate and lose steps. At present, the rotor system still has the following problems: 1. Add a first-stage induct...

AI Technical Summary

Problems solved by technology

[0002] At present, brushless DC motors use position sensors (Hall elements) to measure the position of the rotor so that the motor controller can issue commutation commands in time. Now there is a sine wave control method with a position sensor. In this control mode, the main rotor of the motor The magnetic field uses a strong magnetic field, and the control drive signal has higher requirements for the consistency of the motor's back EMF and the Hall output signal. If the consistency is not good, it will cause the program used for one motor to be used on another. Abnormal phenomenon occurs, the noise and vibration of the motor will increase, the efficiency will decrease, and the unique advantages of the sine wave motor will be lost. In severe cases, the motor will vibrate and lose steps

At present, the rotor system still has the following problems: 1. Add a first-stage induction magnetic ring after the main magnetic field of the motor. The problem is that the relative position between the main magnetic field and the induced magnetic field is not easy to control, and the accuracy is not high, which affects the measurement accuracy; 2. Charging Enterprises with better magnetic technology use the method of magnetizing the main magnetic field and the induced magnetic field together. This method is suitable for magnetic materials with low magnetic properties such as ferrite or bonded NdFeB, and is not suitable for strong magnetic materials such as sintered NdFeB. Material, because the process does not allow; 3. Add an adjustable Hall component behind the motor end cover, detect the relative position of the Hall signal and the back EMF waveform by dragging the back EMF, and then adjust the fine-tuning Hall component to Realize the relative positional relationship between the required main magnetic field and the induced magnetic field. This method is not good in manufacturability, and the overall accuracy is not high. The overall performance of the motor varies greatly, and installation is troublesome.

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