Product Overview: Nidec Control Techniques SM-RESOLVER
The SM-RESOLVER is a high-performance feedback option module specifically designed for the Unidrive SP, Digitax ST, and Commander SK drive families. This module serves as a specialized interface that allows the drive to read position and speed data from a resolver feedback device. Resolvers are preferred in heavy-duty industrial environments, such as aerospace, automotive test stands, and steel mills, where high temperatures and mechanical vibrations would degrade standard optical encoders.
High-Precision Signal Processing
The SM-RESOLVER module provides a robust excitation signal to the resolver and converts the resulting sine and cosine analog signals into a 14-bit digital format. It supports a wide range of resolver types, including 2-pole and multi-pole configurations. Because it fits into any of the drive’s Solutions Module (SM) slots, it allows for a highly modular system design. The module is engineered with advanced noise filtering to ensure that the feedback signal remains clear and accurate even in high-electromagnetic interference (EMI) environments typical of large drive cabinets.
Key Technical Characteristics
- Part Number: SM-RESOLVER.
- Excitation Frequency: 6 kHz (Optimized for standard industrial resolvers).
- Resolution: 14-bit (16,384 positions per revolution).
- Resolver Transformation Ratio: 3:1 or 2:1 (Software selectable).
- Input Voltage: Up to 2Vrms sine/cosine signals.
- Excitation Voltage: 6Vrms max.
- Compatibility: Unidrive SP, Digitax ST, Affinity, and Commander SK (via adapter).
- Operating Temp: 0°C to +50°C.
Industrial Reliability and Safety
Built with industrial-grade semiconductors, the SM-RESOLVER features integrated diagnostics to detect «Feedback Wire Break» or «Excitation Error» conditions. This ensures that the motion control system can be brought to a safe state immediately upon signal loss. Its rugged design ensures a long service life, and the module is fully supported by CTSoft and SyPTPro software tools for rapid commissioning and tuning of the motor feedback loop.
| Feature | Detail |
| Update Rate | 250 µs for position loops |
| Max Speed | Up to 40,000 RPM (depending on pole count) |
| Connectors | Removable screw terminals |
Frequently Asked Questions
Can I use a multi-pole resolver? Yes, the drive software allows you to configure the number of poles to maintain accurate positioning. Does it require an external power supply? No, the module is powered directly from the drive’s internal DC bus.
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