High-speed motor regulation
- Reduced noise, vibrations, weight of electric motors
- Increased reliability low cost
- Precise motor regulation
- Direct Torque Control (DTC)
- GRENOBLE INP
Smoothcontrol is aimed at the brushless motors market. The brushless motors market is growing rapidly ($25.6 billion in 2017 with annual growth of 7.2% ). The increased use of brushless motors is due to the reduced cost of control electronics. These motors are widely used, for example in drones , domestic electric appliances (hair driers, etc.) and cars (windscreen wipers). The aim is to develop new products and services based on a new technology for the regulation of brushless motors. This is achieved by pushing a technical limit (the rotation speed) to achieve other applications of the electric motors and thus strongly contribute to the development of motorised objects.
Smoothcontrol is an 8-bit controller (software/electronics) that provides the control-command system for brushless motors. Smoothcontrol consists of an electronic device for permanent current measurement without needing an estimate, a driver for controlling power transistors enabling high frequencies, and embedded control software based on the mapping of motor parameters (>100) recorded and replayed to stay close to the irregularities of motor manufacturing (non-linear regulation).
As a result of its precise regulation, Smoothcontrol reduces noise and vibrations, and increases speed to 120000 – 240000 tr/mn.This increase in speed increases the power of constant weight motors while maintaining a low level of noise and vibration.
The reduction in vibrations directly increases the reliability of the motor and, in the end, the product. A considerable reduction in costs of the command system due to the use of simple electronics, µP 8bits, for improved performance.
State of progress
A first controller for a 60000tr/mn motor was tested at 100kHz in the pre-project stage. This showed good prospects concerning the low heat build-up of the power electronics and permanent current measurement.
- Cars: downsizing of the engine with reduced cylinder capacity by means of a more efficient low-output and very reliable electric turbo, reduced costs enabling the expansion of all the ranges (improved engine motor driven by European legislation)
- Medical: in dentistry, improved patient comfort (noise, vibrations)
- Numerous other emerging markets requiring high speeds
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