List of motor characteristics
3RK AC reduction motor (15 – 20W) (70mm)
| Motor Model | Specs | Output Power W | Voltage V | Frequency Hz | Current A | Starting Torque | Rated Torque | Rated Revolution r/min | Capacity/Ve μF/VAC | ||
| JWD Types | mN.m | gf.cm | mN.m | gf.cm | |||||||
| 3RK15GN-C | Reversible 30min | 15 | 1-phase 220V | 50 | 0.16 | 187 | 1870 | 150 | 1500 | 1250 | 1.5/450 |
| 3RK15A-C | 60 | 0.18 | 158 | 1580 | 127 | 1270 | 1500 | 1.5/450 | |||
| 3RK15GN-A | Reversible 30min | 15 | 1-phase 110V | 50 | 0.36 | 187 | 1870 | 150 | 1500 | 1250 | 6/250 |
| 3RK15A-A | 60 | 0.38 | 158 | 1580 | 127 | 1270 | 1500 | 6/250 | |||
| 3RK15GN-S | —— | 15 | 3-phase 220V | 50 | 0.1 | 143 | 1430 | 115 | 1150 | 1250 | —— |
| 3RK15A-S | 60 | 0.1 | 120 | 1200 | 95.5 | 955 | 1500 | —— | |||
| 3RK20GN-C | Reversible 30min | 15 | 1-phase 220V | 50 | 0.26 | 187 | 1870 | 150 | 1500 | 1300 | 2.5/450 |
| 3RK20A-C | 60 | 0.28 | 158 | 1580 | 127 | 1270 | 1550 | 2.5/450 | |||
| 3RK20GN-A | Reversible 30min | 15 | 1-phase 110V | 50 | 0.54 | 187 | 1870 | 150 | 1500 | 1300 | 10/250 |
| 3RK20A-A | 60 | 0.58 | 158 | 1580 | 127 | 1270 | 1550 | 9/250 | |||
- Parameters in above table refer to motor alone,without any load device.
- Permissible change in rated speed and rated current of the motor is within the range of±5%.
Outline dimension drawing


Allowable load for the gear motor
| Geared-down | Synchronous speed | 500 | 300 | 200 | 150 | 120 | 100 | 75 | 60 | 50 | 40 | 35 | 30 | 25 | 20 | 15 | 12 | 10 | 8 | 6 | |
| Ratio | 3 | 5 | 7.5 | 10 | 12.5 | 15 | 20 | 25 | 30 | 36 | 40 | 50 | 60 | 75 | 100 | 120 | 150 | 180 | 250 | ||
| Max allowable | 15W | Kg.cm/N.m | 2.86 0.28 | 4.81 0.48 | 7.51 0.75 | 9.46 0.93 | 11.8 1.18 | 14.7 1.47 | 17 1.67 | 21.5 2.15 | 23.5 2.35 | 30.6 3.01 | 34.1 3.34 | 39.27 3.92 | 47.1 4.7 | 50 4.9 | |||||
| 20W | kg.cm/N.m | 3.52 0.35 | 5.80 0.58 | 8.74 0.87 | 12.6 1.24 | 14.5 1.45 | 17.15 1.71 | 22.6 2.23 | 26.1 2.61 | 30.4 3.04 | 40.8 4.01 | 45.5 4.4 | 50 4.9 | ||||||||
- The speed is based on the synchronous motor speed reduction ratio as a benchmark calculated by dividing the value of.Actual speed will vary the size of the load changes in less than the values shown in2~15%.
- Hope to the table of the reduction ratio is greater than the further reduction,it would be installed between the motor and the reducer reduction ratiio of 10 the middle of the reducer.
- When the load torque exceeds the maximum allowable load torque gear motor,and a locked rotor situation exists,please slow down box at the junction of the output shaft and load torque limit device installed to ensure the normal operation gearbox.
Product Overview
The Small AC Gear Reducer Motor 15W is a compact 3RK series geared motor built on a 70 mm frame. It pairs a reversible single-phase or three-phase AC motor with a precision reduction gearbox, delivering rated torque from 95.5 to 150 mN·m at rated speeds of 1250–1550 r/min. With a 15–20W power range, this small gear reducer motor is designed for machines that need steady, low-speed, high-torque motion in a very small footprint.
Key Features
- Compact 70 mm frame for space-limited applications
- Reversible 30-minute rated duty for forward and reverse operation
- Single-phase 110V/220V and three-phase 220V options at 50/60Hz
- Rated torque up to 150 mN·m with output speeds of 1250–1550 r/min
- Gear ratios from 3:1 up to 250:1 for flexible output speed
- Maximum allowable load up to 4.9 N·m (50 kg·cm)
Applications
This 15W gear motor is well suited to light-duty automation: small conveyors, indexing tables, vending machines, dispensing devices, valves, and packaging equipment. Because the unit is fully reversible, it also fits positioning and reciprocating drives. For heavier loads, browse the complete small AC gear reducer motor range.
How to Choose the Right Gear Motor
Match the required output speed and torque to the allowable load table, then confirm voltage, frequency, and duty cycle. If you need help sizing a drive, read our gear motor selection guide or contact Tenchuan with your application details.
FAQ
What voltage options are available?
Single-phase 110V and 220V, plus a three-phase 220V version, in 50Hz and 60Hz ratings.
What is the rated torque?
Rated torque is 95.5 to 150 mN·m depending on the model and frequency, with a maximum allowable load of 4.9 N·m at the lowest ratios.
Can the motor run in reverse?
Yes. The reversible 30-minute rated models support forward and reverse rotation for frequent reversing applications.
What gear ratios are available?
Ratios from 3:1 to 250:1 are listed in the allowable load table, giving output speeds down to about 6 r/min.
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