How Does Switched Reluctance Technology Work?



Striatech's electric motors utilize Switched Reluctance Motor (SRM) technology. This variable speed drive has a simple structure. Around the outside of the motor are a number of electromagnets. The rotor is an extension of the  spindle - it looks like a large toothed shaft. This technology is time-tested -- it was invented in the 19th century and hadn't been perfected until Striatech's engineers and developers determined the proper control system to guarantee high torque at low speeds. The motor and controller work together to provide the user with one of most quiet, most reliable and most intelligent motor ever developed. 


The Motor and Controller

The motor and controller have a body and brain relationship -- the motor handles the movement, while the controller makes the decisions. But unlike similar motors, this one actually provides feedback to the controller to allow it to make changes based on the current conditions. Added load on the spindle sends a signal to the controller, which will then compensate for the speed that's been lost. Thus, the motor is able to maintain a constant speed despite its conditions. 

package-drive-clean-cut.pngA feedback loop senses the motors surroundings to actively monitor conditions and performance, including how much power is actually drawn from the socket to the lathe at any time to complete the project on the spindle. Since it works by magnetic attraction, the speed or position of the shaft is unimportant to its torque.
In comparison, a regular ‘dumb’ AC or DC motor is not able to make a connection between the power supplied and the actual spindle requirements. The actions of the Striatech motor are controlled by a micro computer, using a digital display and soft control pad.
Through intelligent control, this variable speed motor ‘talks’ to the internal micro-computer constantly monitoring conditions, giving it the edge in comparison tests with a conventional motor. It analyzes both the spindle position and the power required to maintain a given speed, hundreds of times per second. The motor knows the exact shaft position and is constantly computing where the shaft should be. At 2000 rpm, for instance, it is computing the shaft position 24000 times per minute.

SR motors have a uniquely simple construction with very few moving parts, and rarely do these motors fail. That's why Striatech confidently offers a five-year warranty on any of our motors. Its design allows for limited maintenance and therefore, more time spent doing what its meant to do. 


Benefits of Striatech's Smart Motor Technology


The Striatech motor is digital, just like a computer. It can save and store speed information on different preset settings and switch from one to another immediately, with just the single press of a button. This smart technology can also detect the input power resource, giving the Striatech motor the ability to operate at a variety of different voltages (100v to 240v) and without further modifications being required.


Striatech's micro-computer automatically detects the load on the output shaft, and adjusts power extraction according to the load. As a result, the motor has its highest torque at lowest speed and has a flatter torque curve over a wide range of speeds.

This unique characteristic means the Striatech motor can be mounted directly to the output shaft, which allows it to achieve better output by eliminating the power lost in a traditional gears/belts and pulley drive system. (Typically, a belt driven machine has about 20% power loss just in the belt system alone!) When the shaft is under a light load, the micro-computer will reduce the power extraction to save energy. Combine this with the energy saving from eliminating the belt and pulley system, and the DVR motor can save up to 80% energy over a conventional AC motor.



Our standard DVR motor will be able to be used unmodified for many different applications straight off the shelf. But our DVR Motor Technology can also be customized to suit your individual requirements. Adjustments such as Power Rating, Human Machine Interface (HMI), Speed Range, Safety Features, and much more.



The Teknatool International group has already been researching and using this motor technology for more than a decade. Sold as a wood lathe motor under the reputable NOVA brand name, the Striatech motor has had proven success in dusty and demanding conditions in all kinds of environments in all corners of the globe; from freezing Alaska and Iceland, to tropical Australia and Central America.



The DVR motor is constantly monitored by the micro-computer. In case of a sudden spindle lock, or unexpected sharp increase in load, the motor will automatically shut down power to the spindle - even from top speeds - to avoid any injury. There is further potential with this DVR motor to implement many more safety features determined by each customer's requirements.



The direct drive system uses up to 80% less energy than traditional motors and turns on and off with not power spikes, achieving better output.