Datasheet 搜索 > 电机驱动器 > ST Microelectronics（意法半导体） > L6207D 数据手册 > L6207D 产品描述及参数 1/3 页
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L6207D 产品描述及参数 - ST Microelectronics（意法半导体）
制造商:
ST Microelectronics（意法半导体）
分类:
电机驱动器
封装:
SOIC-24
描述:
STMICROELECTRONICS L6207D 芯片, 电机驱动器, 双路, DMOS, 5.6A, 24SOIC
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L6207D数据手册
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April 2012 DT0002 Rev 1 1/3
www.st.com
DT0002
Design tip
Reducing torque variation in half step drive
By Thomas Hopkins
Main components
L6506
Current Controller For Stepping Motors
L6207, L6227
Dual DMOS Full Bridge Driver with PWM Current Controller
Purpose and benefits
This note describes a technique to reduce torque variation when driving two phase bipolar
stepper motors in half step. Reducing the torque variation can reduce the chance of the
motor stalling and give more reliable operation.
Description
The stepping sequence for a half step drive of a two phase bipolar stepper motor alternates
between states driving current in both phases and driving current in only one phase. In
many implementations, the current level is set to be the same whether one or both phases
of the motor are being driven, as shown in Figure 1a.
Figure 1. Current waveforms in half step operation
For the motor, torque is proportional to the magnitude of the stator and rotor magnetic
vectors times the sine of the angle between the stator vector and the rotor vector. When
driving a motor with two coils, the magnitude of the resulting magnetic vector is the vector
sum of the vectors produced by each coil. If the two coils are oriented 90 degrees apart
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