汽车电子中的数字信号控制器改善了汽车电子中马达的控制性汽车电子中的数字信号控制器改善了汽车电子中马达的控制性
能能
摘要:数字信号控制器(DSC)在单片上组合了微控制器和DSP的功能,能成功用于汽车电子中的直流无刷电机
(BLDC)的控制.文章包括了采用BLDC马达的好处,DSC的主要特性和性能以及为什么DSC很适合于马达控制应用
等方面的内容. DSCs boost automotive electric motor controlDigital signal controllers combine microcontroller
and DSP functionality on-chip for automotive brushless DC (BLDC) motor applicationsBy
摘要摘要:数字信号控制器(DSC)在单片上组合了微控制器和DSP的功能,能成功用于汽车电子中的直
流无刷电机(BLDC)的控制.文章包括了采用BLDC马达的好处,DSC的主要特性和性能以及为什么
DSC很适合于马达控制应用等方面的内容.
DSCs boost automotive electric motor control
Digital signal controllers combine microcontroller and DSP functionality on-chip for automotive
brushless DC (BLDC) motor applications
By Willie Fitzgerald, Microchip Technology
Mechanically actuated automotive systems, such as power steering and fuel and water pumps,
are being replaced with systems that utilize electric motor technology. Consequently, the
presence of semiconductors in automobiles is increasing geometrically, in part due to
automotive systems developers' desire for electronic motor control to address consumer
requirements for safer, more efficient cars.
One contingent of the synchronous motor group, brushless direct current (BLDC) motors, are
ideal for automotive applications that continuously rotate, such as pumps, cooling fans, and
stepper motors. BLDCs equip positioning systems with start and stop functions where high
reliability is required.
Furthermore, the electronic control that BLDC motors offer is critical to statutory vehicle
requirements, including energy-savings, reduced environmental and emissions impact, and the
creation of safer vehicles. BLDC motors are also useful for variable-speed applications where
space is tight, as in fuel pump control and electronic/electric power steering. In these types of
applications, electronic control is essential because of the need for fault diagnostics and wide
temperature and voltage operational ranges.
The embedded processor is a critical tool for automotive system designers as they address the
increasing needs and demands of today's driver. The increased use of electronic controls
enables automotive system designers to meet these needs, while meeting their own
requirements to develop low-cost, low-noise, high-accuracy systems with faster time-to-market.
A multitude of embedded-processor solutions is available to automotive design engineers. One
single-chip architectural platform that is ideal for BLDC motor control is the 16-bit digital signal
controller (DSC). This type of platform delivers the control of a microcontroller, along with the
computation and throughput capabilities of a digital signal processor (DSP). In this way, DSCs
are excellent at executing the complex, high-speed mathematical functions required by many
automotive electronics systems.
DSCs, such as Microchip's dsPIC, offer a seamless migration path and pin-for-pin compatibility,
which enable the re-use of hardware and software building blocks. This combination of a 16-bit
MCU with DSP capabilities enhances the performance of automotive electronic systems, while
lowering system costs and enabling designers to get products to market faster.
The DSC combines MCU control and DSP number crunching functions.
View a full-size image
Overview of BLDC Motors
The BLDC motor does not operate directly off a DC voltage source, nor does it use brushes for
commutation. Instead, the BLDC motor contains a rotor with permanent magnets and a stator