Tamagawa TS2620N941E172 Precision Rotary Encoder / Resolver

The Tamagawa TS2620N941E172 is a precision rotary encoder or resolver (exact type depends on configuration) manufactured by Tamagawa Seiki. Tamagawa is a leading brand for resolvers and encoders used in servo motors, robotics, and machine tools. The TS2620 series typically offers a compact size (diameter 26mm) with high accuracy and resolution. This model is commonly used as a feedback device for AC servo motors in industrial automation, providing position and speed information to the drive controller.

Technical Specifications (Typical for TS2620 series)

• Model: TS2620N941E172

• Type: Brushless resolver (or absolute encoder variant)

• Diameter: 26 mm (hollow shaft or solid shaft)

• Resolution: 12‑bit to 16‑bit (absolute) or 512 to 2048 ppr (incremental)

• Accuracy: ±10 arcminutes typical

• Output Signals: Sine/Cosine (differential, 1 Vrms) for resolver; or serial data (EnDat, BiSS) for absolute encoder

• Excitation Frequency (if resolver): 5 kHz to 10 kHz

• Power Supply: 5V DC or 8V DC (depending on type)

• Current Consumption: 40 mA typical

• Maximum Speed: 10,000 rpm (mechanical)

• Operating Temperature: -20°C to +100°C

• Protection Rating: IP40 or IP65 (depending on sealing)

• Connector: 10‑pin circular or ribbon cable

Functional Description

If the TS2620N941E172 is a resolver, it consists of a rotor with a single winding and a stator with two windings (sine and cosine). The external drive supplies an AC excitation voltage to the rotor, and the output amplitudes (sine and cosine) vary with the angular position. This analog absolute position signal is then digitized by the drive’s resolver‑to‑digital converter. Resolvers are extremely rugged, vibration‑ and temperature‑resistant, making them ideal for heavy‑duty motors.

If it is an absolute encoder, it would output a serial digital data stream (e.g., EnDat 2.2, BiSS) containing the multi‑turn and single‑turn position. The N941E172 suffix may indicate a specific multiturn count (e.g., 4096 revolutions) and a specific communication protocol.

Mechanical Interface

The device has a 26mm diameter housing, typically with a 6mm or 8mm hollow shaft for direct mounting on a motor shaft. The stator is fixed with three M3 screws. The cable exit is radial or axial. The rotor hub has a clamping ring for backlash‑free mounting. The unit is balanced to G2.5 at 3600 rpm.

Electrical Connections

For resolver version: pins are typically R1/R2 (excitation), S1/S2 (sine output), S3/S4 (cosine output). Shielded twisted‑pair cables should be used, with the shield connected to ground on the drive side. For encoder version: power (5V, GND), data+, data‑, clock+, clock‑, and optional incremental channels A, B, Z.

Compatibility and Applications

This device is used as a feedback component in servo motors from various manufacturers (e.g., Yaskawa, Mitsubishi, Panasonic, Delta) that accept Tamagawa resolvers or absolute encoders. It is also found in CNC rotary tables, industrial robots, and packaging machinery requiring accurate closed‑loop control.

Environmental and Reliability

Operating temperature: -20°C to +100°C (stator), -20°C to +80°C (rotor). Vibration: 5g (10‑500Hz). Shock: 50g. MTBF > 100,000 hours. The resolver version has no electronics, making it virtually immune to EMI and radiation.

Installation Notes

Do not disassemble the unit; the alignment between rotor and stator is factory set. Use a non‑magnetic tool when handling. For hollow shaft mounting, ensure the motor shaft surface is clean and free of burrs. Tighten the clamping screw to 0.5 Nm. For resolver, the air gap between rotor and stator is factory‑set and not user‑adjustable.

Testing and Troubleshooting

For resolver, measure excitation voltage (typically 7 Vrms across R1‑R2). With the motor stationary, the sine and cosine outputs should be constant voltages proportional to position. Rotating the shaft manually produces varying output amplitudes. For encoder, use an oscilloscope to check data signals or a test box to read the absolute position.

Conclusion

The Tamagawa TS2620N941E172 is a high‑quality feedback device for demanding motion control systems, offering excellent accuracy and environmental robustness.