ITK Engineering Develops IEC 62304–Compliant Controller for Dental Drill Motor with Model-Based Design
挑战
解决方案
结果
- 发展时间减半
- 硬件问题很早发现
- 合同赢了，客户信心建立了
“基于模型的设计具有Simulink，使我们能够通万博1manbetx过早期验证降低成本和项目风险，在IEC 62304认证的系统上缩短推销，并提供了首次正确的高质量生产代码。”
迈克尔·施瓦茨（Michael Schwarz），ITK工程
无传感器无刷直流（BLDC）电动机非常适合用于牙科演习。它们的磨损比拉丝电动机少，并且更可靠，更安静，更易于维护和消毒。与带有传感器的BLDC电动机相比，无传感器BLDC电动机便宜较低，更紧凑。但是，无传感器控制所需的复杂算法需要开发更多的工程工作。
ITK Engineering saved time and effort by using Model-Based Design to develop and implement a production BLDC motor controller compliant with the IEC 62304 standard for medical device software.
“基于模型的设计，使用Simulink的设计使我们万博1manbetx能够设计和优化控制器，甚至在电动机硬件进行测试之前，然后在使用电动机后为控制器生成生产代码，”医疗控制高级工程师Michael Schwarz博士说。ITK的系统。“如果我们手工编写代码，就不可能按计划完成该项目。”
挑战
Dental drill motors operate at speeds up to 40,000 RPM. The field-oriented control algorithm for such motors needs precise information about the rotor position over a wide speed range. In a sensorless motor, rotor position must be deduced from changes in current in the stator caused by electromagnetic induction from the rotor magnet. ITK engineers needed to design and optimize a rotor position estimator, as well as a sophisticated cascade control for the dental drill motor that would comply with the IEC 62304 standard for medical device software.
当项目开始时，原型电动机不可用。为了满足客户的项目截止日期，ITK必须与电动机硬件并行开发控制器软件。ITK工程师需要创建一个准确的电动机模型，并开发与该模型一起使用的控制器。电动机可用后，他们需要在嵌入式处理器上快速实施和测试其控制软件。
解决方案
ITK engineers designed, optimized, implemented, and tested the sensorless BLDC motor controller with Model-Based Design.
工程师从数据表中工作的现有电动机和客户提供的信息，在Simulink中对BLDC电机（包括其电气和机械组件）进行了建模万博1manbetx®。
他们在simulink中开发了一个控制器模型，并使用了状态流万博1manbetx®to model startup, shutdown, and error modes, as well as user-selectable operating modes.
The team ran closed-loop simulations of the plant model and the initial controller model, which relied on a rotor position signal supplied by the plant model.
开发转子位置估计,团队used Symbolic Math Toolbox™ to solve algebraic equations, and then refined the estimator until its results matched the actual rotor position signal from the plant model.
Using the automatic scaling and data type override capabilities of Fixed-Point Designer™, the engineers converted their floating-point controller design to fixed point. They reran simulations to verify the fixed-point model.
团队开发了MATLAB®对单个模型组件进行批处理单元测试的脚本。他们使用Simulink Coverage™为这些测试生成了模型覆盖报告。万博1manbetx
该团队通过嵌入式编码器从其控制器模型中生成了5000多行的C代码®。他们编译了手臂的代码®Cortex®-M3 processor with a Keil compiler.
工程师在原型板和电动机上测试了控制器，精炼了模型并重新生成代码以优化性能。
ITK将控制器和工厂的Sim万博1manbetxulink模型以及生成的生产代码以及其客户提供。控制器和无传感器BLDC电动机目前正在牙科钻头中进行串联生产。
结果
发展时间减半。“We completed controller development in about four months,” says Schwarz. “Without Model-Based Design it would have taken at least twice as long, because we would have had to wait for hardware, write code by hand, and test more prototypes.”
硬件问题很早发现。ITK系统工程师Alexander Reiss说：“我们的工厂模型准确地反映了运动行为，这使我们能够在开发的早期验证控制器和硬件。”“我们迅速确定了第一个硬件原型上错误的根本原因：在硬件上测量的结果与我们经过验证的Simulink模型产生的结果不符。”万博1manbetx
合同赢了，客户信心建立了。“Our client wanted to start work immediately. Model-Based Design helped us get the contract because it enabled us to begin development before hardware was available,” says Reiss. “Model-Based Design also increased our client’s confidence in our work; we shared our Simulink models and simulations, which they now use to make their own enhancements.”
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