Method of outputting UVW signals in incremental encoder IC

Abstract

The invention discloses a method for outputting UVW signals in an incremental encoder IC. An incremental encoder IC which can output U, V and W signals at the same time is included, and the encoder iscomposed of an incremental signal generation module, a UVW signal generation module, an input control module, a mode selection module and an output driving module. The input control module is used for configuring mode selection and driving increment signal or UVW signal output by judging the motor state and signal feedback. According to the method for outputting the UVW signals in the incrementalencoder IC, the U, V and W signals are output by multiplexing the output interface of the incremental encoder, and a brushless motor system determines the sequence and direction of energization of amotor control coil during initial energization. Therefore, the compatibility of the incremental encoder is improved, and the jitter and the noise during the starting of the motor are greatly reduced at the same time. The method can be applied to the fields of motor control, motor sensing and the like.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a method for outputting UVW signals in an incremental encoder IC. Background technique [0002] Incremental encoder converts the displacement change into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and uses the number of pulses to represent the magnitude of the displacement. Incremental encoders usually have three signal outputs (there are six differential signals): A, B, and Z. The signals of the two channels A and B are generally orthogonal (that is, 90° mutual difference) pulse signals. The signals of A and B phases differ by 90 degrees, and the forward rotation and reverse rotation of the encoder can be judged by judging whether A phase is in front or B phase, and Z phase represents the zero reference position. The advantage of the incremental encoder is that the principle is simple and the structure is simple, the...

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Problems solved by technology

[0004] Since the incremental encoder cannot output the absolute position information of the displacement change, at the start time, the brushless motor using the incremental encoder cannot determine the order and direction of the motor control coil energization

At this time, the usual method is to use the method of traversing the energization sequence and trying many times to find the correct sequence of coil energization. At this time, the motor will vibrate back and forth at a small angle, resulting in large noise.

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