ROHM有刷电机解决方案

Release time:2017-04-15
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source:Ameya360
reading:207

1、前言 
    有刷电机是内含电刷装置的将电能转换成机械能(电动机)或将机械能转换成电能(发电机)的旋转电机。区别于无刷电机,电刷装置是用来引入或引出电压和电流的。有刷电机是所有电机的基础,它具有启动快、制动及时、可在大范围内平滑地调速、控制电路相对简单等特点。
2、方案概述

ROHM有刷电机解决方案有定子和转子两大部分组成,定子上有磁极(绕组式或永磁式),转子有绕组,通电后,转子上也形成磁场(磁极),定子和转子的磁极之间有一个夹角,在定转子磁场(N极和S极之间)的相互吸引下,使电机旋转。改变电刷的位置,就可以改变定转子磁极夹角(假设以定子的磁极为夹角起始边,转子的磁极为另一边,由转子的磁极指向定子的磁极的方向就是电机的旋转方向)的方向,从而改变电机的旋转方向。


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NXP will ship this year as many as five SoCs made in Samsung’s 28nm fully depleted silicon-on-insulator (FD-SOI) process, including one that has been sampling for six months. Samsung is expected to announce its FD-SOI roadmap in May and is already working on RF and in-house embedded MRAM for it. An NXP executive showed the first samples of the products at an event here, a key milestone in a long journey for FD-SOI. The next big step is finding an embedded non-volatile memory for the process, given embedded flash is expected to hit limits at 14nm. A Globalfoundries executive declined to say when it expects to ship the first commercial chip in its 22nm FD-SOI or how many tapeouts it has completed in the process. The company announced its first FD-SOI tapeout last year and said it now has 70 customer engagements. “Our FD-SOI business is small right now, but it will be mainstream,” said Ryan Lee, a vice president of foundry marketing for Samsung. One chip designer at the event said his company has been interested in FD-SOI for a long time. It made a test chip at STMicroelectronics but chose to work on commercial designs with Samsung because Globalfoundries was not ready until Sanjay Jha became the foundry’s CEO, after the fabless company made its decision. NXP's Geoff Lees shows samples of his FD-SOI i.MX chips. (Image: EE Times) NXP described four 64-bit ARMv8 and one 32-bit ARMv7 embedded SoCs under its i.MX brand, three now in production in Samsung’s FD-SOI process. Over the next two years, the family will cover a performance range that scales by a factor of 25, five times more than its planar-based i.MX chips, each design optimized for different performance and power characteristics. “I don’t think that would be possible without 28nm FD-SOI,” said Geoff Lees, general manager of NXP’s microcontroller group. A high-end automotive SoC will run up to eight 1080-progressive displays and run without a fan. “It’s operating in conditions that would kill a cellphone,” with three orders of magnitude better reliability, Lees said. An i.MX 7ULP announced in March includes independent application and real-time domains. It targets a wide range of markets from home automation to wearables. Long term, Lees said FD-SOI promises better ADCs and lower power radios. For example, he expects single-antenna 802.11n Wi-Fi on the power budget of Zigbee and other 802.15.4 protocols and an ability to take “Bluetooth Low Energy to new record power levels, opening up new apps at new cost points.”
2017-04-13 00:00 reading:915
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