​Higher precision motor controllers development

Development of Stepping Motor Solutions for Robots, OA Equipment, and Medical/Nursing Equipment | Renesas and MinebeaMitsumi

Stepping motors with a resolver allow high-precision motor control even in harsh environments with heat, dust, or vibration. They also deliver superlative characteristics such as the ability to carry heavy loads without step-out. Renesas and MinebeaMitsumi have developed a new type of resolver stepping motor and resolver motor control solutions that provide superlative cost performance, which makes it possible to expand the range of applications for stepping motors. For example, in robots or automated guided vehicle (AGV) development, customers can achieve high-precision motion even in harsh environments such as warehouses or the outdoors, while reducing costs and further miniaturizing industrial equipment by using smaller motors.
 
Key features:
 
High torque characteristics: 2 to 3 times as much torque compared to existing products due to no step-out control

Control characteristics: able to drive at broadband and ultra-low speeds

Low power consumption: current optimization by servo control that responds to the actual load

High precision: high position precision achieved by high resolution of 200,000 P/R

Environmental resistance: highly resistant to heat, dust, and vibration due to its simple structure

Miniaturization: the high torque of these motors makes miniaturizing application products possible

Key features of Renesas’ RDC and RDC control driver software
 
Detection methods: VR-type voltage detection, VR-type current detection

RX MCU support: Renesas supplies RDC driver software for the RX24T (support for other MCUs planned)

Resistance to electromagnetic noise: position detection is possible with a signal-to-noise ratio of 1/2 (noise twice the signal) due to the inclusion of filters

Renesas’ resolver-based stepping motor control kit
 
Included items: MinebeaMitsumi 42-mm square resolver stepping motor, control board, CPU board (includes the RDC and RX24T)

Development support tools: Renesas Motor Workbench (includes real-time waveform display functions)

Included software: RDC control driver software, stepping motor control software