Brushless electric machine rotor sheet of automobile brake system

Abstract

The invention discloses a brushless electric machine rotor sheet of automobile brake system, wherein a peripheral of a rotor sheet utilizes straight lines and arcs to form a salient pole structure. An U-shaped groove is disposed at the rotor sheet. The U-shaped groove is divided into three sections which have the same length. A flux-insulation bridge and a location step are disposed at a joint of the U-shaped groove. The rotor sheet is provided with a location hole for rotor-skewing. A peripheral of the salient pole of the rotor sheet utilizes a structure of straight line and arc, which reduces a content of a counter emf harmonic wave. Optimal designed shape and size of U-shaped magnetic steel groove and the peripheral of the salient pole can expand the range of field-weakening speed expansion of a motor. The motor can provide a certain torque in high speed running and meanwhile magnify the counter emf. A watt density of the motor is improved, and a quality of the motor is reduced. Three sections of the U-shaped groove have the same length, thus the motor only uses one size of magnetic steel, which decreases the cost of the motor. The flux-insulation bridge of the joint of the U-shaped groove also reduces the content of the counter emf harmonic wave. When the rotor is skewing, the skewing location pole is capable of providing a location without a rotor-skewing location frock. The brushless electric machine rotor sheet of automobile brake system is designed properly and is convenient and practical.

Description

technical field [0001] The invention relates to a brushless motor rotor punching plate of an automobile brake system, which belongs to an optimization technology for the brushless motor rotor punching plate of an automobile brake system. Background technique [0002] Automotive brake systems have higher and higher requirements for brushless motors, which require brushless motors to be lightweight, maintain a certain torque output at high speeds, have low torque ripple, and low cost. The rotor magnets of traditional brushless motors are surface-mounted or embedded, and the main magnetic flux of the motor cannot be further improved. The performance requirements can only be met by increasing the length of the fuselage. Obviously, it is impossible to expand the speed of field weakening, and when the motor speed increases, the torque that meets the requirements cannot be output. The relatively high back EMF harmonic content and the relatively high cogging force make the motor to...

AI Technical Summary

Problems solved by technology

The rotor magnets of traditional brushless motors are surface-mounted or embedded, and the main magnetic flux of the motor cannot be further improved. The performance requirements can only be met by increasing the length of the fuselage. Obviously, it is impossible to perform field weakening and speed expansion, and when the motor speed increases, the torque that meets the requirements cannot be output

The relatively high back EMF harmonic content and the relatively high cogging force make the motor torque ripple relatively large. If the rotor is skewed, special tooling is required, resulting in an increase in the cost of the motor

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