STMicroelectronics has released a new single-chip motion controller that engineers can use to design a variety of equipment with quieter, smaller, and lighter precision movement and position systems, the company said.
The new cSPIN controller includes similar features to controllers with a multi-chip architecture but with all the functionality on one chip, making it optimal for the design of equipment that requires precise movements, such as robotic systems and industrial automation, as well as security cameras and other camera-focusing mechanisms.
"The key benefit is the possibility to implement a high-performance stepper motor driver in a very simple, compact, and inexpensive way, while the state-of-the-art technology avoids the need for several ICs and many passive components," Vincenzo Marano, system and application manager for motor control at STMicroelectronics, told Design News.
The cSPIN, STMicroelectronics’ new single-chip motion controller, allows for the design of equipment such as robotics and industrial machines with quieter, smaller, and lighter precision movement and positioning systems, according to the company. (Source: STMicroelectronics)
Many current motion controllers include more than one processor, which generally provides more noise and complexity in equipment design, according to STMicroelectronics. Multi-chip controllers also often require additional motor-control software, as well as for designers to combine calculation, control, and interfacing functions after they’ve been developed on separate chips, adding an extra step to the equipment development process.
"Because of the integration of the motion engine, cSPIN needs few resources from the host controller (typically a microcontroller): no complex routines need to be implemented in the controller software allowing for faster development cycles and cost savings, especially in multi-motor applications," Marano told us.
CSPIN’s single-chip design is more compact and low-weight than multi-chip controllers, and also allows for precise control over rotation speed, which is handy when designing repeatable motions that require accuracy, such as equipment that mixes liquids for medications, according to the company. "The most common stepper motor models provide 200 step per revolution, which, with this product, turns into more than 25,000 micro steps per revolution," Marano said. "Such a high resolution, together with a special control technique (voltage mode operation), also provides an exceptional motion smoothness."
Engineers also can develop equipment that is less noisy, which can reduce the environmental impact on people working in places like laboratories and hospitals. The controller’s lightweight and compact design also lends itself to the development of systems that overall are lower cost and more efficient, eliminating the inclusion for shunt resistors and therefore reducing the possibility of energy waste, according to STMicroelectronics.
STMicroelectcronics has released two versions of the cSPIN controllers -- the L6480, which supports micro-stepping operation at up to 1/128 steps resolution, and the L6482, which includes the predictive control algorithm and the auto-adaptive decay mode.
The core features of cSPIN controllers include the following:
A digital motion engine, gate driver, and SPI interface on one chip;
Programmable speed control and positioning;
Integrated protection mechanisms: over-temperature, low bus voltage, over-current, motor-stall;
5Mbit/s SPI interface;
Fully-programmable gate driving;
Innovative voltage mode control with internal BEMF compensation (L6480);
Advanced predictive current control with auto-adaptive decay mode (L6482);
Low standby current.
Prices for the controllers based on volume production are $3 for 1,000 units.
I have not experienced problems with noise in Animatics motors, but heat can be an issue. Under certain conditions the motors have heat related problems (the heat kills the controller, I think). I used some in an application where there was a lot of regeneration current and a high duty cycle. The motor life was greatly diminished in this application because of the heating.
One nice thing about the motors is the simple wiring. The power to the motor is unregulated DC (2 wires), and 3 wires for communication. No 3 phase motor cable and no encoder and/or hall sensor cables, etc. Additionally, if you have end of travel and/or home switches, they go straight to the motor.
I didn't like animatic's idea of integrating the controller at the motor. Where intense electromagnetic fields are blasting the local area. Maybe the board is shielded, maybe not. However, I would like to see the motor's power supply at the motor itself and move the drive electronics away.
A useful part perhaps for some applications but what does it do that a dsPIC c/w embedded CAN port cannot? External winding drivers are still required. A processor that does SPI is still required. And unless one mixes P and N channel FETs the high side needs to be 12V above the gates so external support devices and drive FETs are still needed.
What would be really useful would a be device that can microstep a motor to 1/16, have step/dir inputs and have coil drivers with 3.5A and 80V-100V rating. There are a few devices out there that do 2.5A and 24V but exceed that voltage at your peril.
Good find ttemple. Tuning a stepper controller for a particular motor can be real pain, and if you're not a EE, a plug and play solution is the way to go.
Just about every silicon vendor has a "motor controller" part, whether it be for BLDC motors or steppers. What makes the difference is how quickly you can get the part to spin a motor and how much it costs to do it. As mentioned in the article, the biggest problem is the resources required from the micro to spin the motor. Another problem, not often addressed, is debugging. Many of the motor controller parts do not gracefully remove the load when debugging, so that breakpoints and single-stepping can have disastrous results. This part looks to be a very high-end solution that may not fit into smaller motor applications like those used in the gaming industry, but would really work well in medical and robotics.
Animatics (http://www.animatics.com/) has been building the controllers inside the end cap of stepper and servo motors for quite a few years now. You connect a power source and a communication cable to the moter, and off you go.
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