0.55 to 7.5kW · 4 pole · IEC 80 to 132 · 1500rpm at 50Hz · IE4
SELF POWER is Motovario’s self-starting synchronous motor, a hybrid between an asynchronous motor and a reluctance motor. It starts direct on line like a standard induction motor, then pulls into synchronism and runs at constant speed regardless of load, with no magnets, no encoder and no drive required.
The SELF POWER rotor combines a squirrel cage with an advanced magnet-free reluctance geometry. The cage starts the motor asynchronously from the mains; once up to speed, the reluctance design locks the rotor to the supply frequency, so the motor runs at synchronous speed, 1500rpm on a 50Hz supply or 1800rpm on 60Hz, without slip.
The range covers 0.55kW to 7.5kW in 4 pole, in IEC frames 80 to 132, with most ratings in IE4 super premium efficiency. Higher power density means some ratings fit a smaller frame than an equivalent asynchronous motor: 2.2kW is available in frame 90 instead of 100. Overall dimensions match an IE2 asynchronous motor, so it can replace one directly. Casings and flanges are die-cast aluminium, insulation is Class F and protection is IP55 as standard, and a brake version (TBSP-SL) is available.
Because the speed is fixed by the supply frequency, a simple V/f scalar inverter can set an exact speed without encoder feedback, and several SELF POWER motors on one inverter run in synchronism. Lower bearing and winding temperatures and quieter running support longer service life.
| Specification | SELF POWER (TSP-SL / TBSP-SL) |
|---|---|
| Motor type | Self-starting (line-start) synchronous reluctance motor with squirrel cage, magnet-free |
| Power | 0.55 to 7.5kW |
| Poles | 4 |
| Frame sizes | IEC 80 to 132 |
| Speed | 1500rpm at 50Hz; 1800rpm at 60Hz (synchronous) |
| Supply | 230/400V 50Hz; 265/460V 60Hz |
| Efficiency | IE4 (IE3 on the 2.2kW 90LM4 and 3kW 100LB4 ratings) |
| Starting | Direct on line, no inverter needed; or V/f scalar inverter (slip compensation off, 10 to 30% boost may be needed) |
| Speed feedback | Not required |
| Mounting | B3, B5, B14, B34, B35; overall dimensions as an IE2 asynchronous motor |
| Construction | Die-cast aluminium casing and flanges (cast iron B5 flange on frame 132); unpainted as standard |
| Insulation | Class F |
| Thermal protection | PTC thermistors or bimetal cutouts optional |
| Brake version | TBSP-SL, FM DC brake standard, MS AC brake on request |
| Protection | IP55 standard (IP54 on TBSP-SL); IP56, IP65 and IP66 options |
| Marking | CE, UKCA, CCC |
| Load inertia | Maximum load to motor inertia ratio for synchronisation is listed per rating (for example 4.3 on the 80A4 and 6.0 on the 90L4) |
| Power (kW) | Frame | Rated torque (Nm) | Efficiency class |
|---|---|---|---|
| 0.55 | 80A | 3.5 | IE4 |
| 0.75 | 80B | 4.8 | IE4 |
| 1.1 | 90S | 7.0 | IE4 |
| 1.5 | 90L | 9.5 | IE4 |
| 2.2 | 90LM | 14 | IE3 |
| 2.2 | 100LA | 14 | IE4 |
| 3 | 100LB | 19.1 | IE3 |
| 3 | 112MS | 19.1 | IE4 |
| 4 | 112M | 25.4 | IE4 |
| 5.5 | 132S | 35 | IE4 |
| 7.5 | 132M | 47.75 | IE4 |
Source: Motovario SELF POWER brochure SELF POWER/2025/REV.0/EN (TSP-SL/TBSP-SL performance at 400V 50Hz and 460V 60Hz, and dimensions), as held in the Betech download library; Motovario SELF POWER technical catalogue M-SP/IEC/STD/EN rev.0 (2023), product page and news of 19 May 2025 (range extended to 7.5kW). Checked 1 November 2026.
For technical information, brochures and further product details, visit our downloads page.
A motor that starts like an induction motor, using a squirrel cage, then locks to the supply frequency and runs at synchronous speed. A conventional synchronous motor needs a drive or a separate starting method; the SELF POWER starts direct on line.
No. It starts and runs direct on line at 1500rpm on a 50Hz supply. A V/f scalar inverter can be used to set a different speed, with slip compensation switched off, and the motor holds that speed exactly without an encoder.
No. The rotor uses a reluctance geometry with a squirrel cage and no permanent magnets, which reduces the raw material in the motor and its environmental impact.
Yes. Its overall dimensions match an IE2 asynchronous motor of the same rating, so it can replace one directly with an efficiency gain. Check the load inertia against Motovario’s limit for each rating, so the motor can pull into synchronism.
Drives that benefit from exact, constant speed or high efficiency. Motovario lists pumps, compressors, fans and ventilation, bottling, textiles, conveyor belts and mixers.
Yes. B5 and B14 versions fit Motovario gearbox motor adaptors in the same way as the M Series three phase motors.
Browse the SELF POWER range by power and mounting, or tell us about the drive and we will check the rating and load inertia for you.
Contact
Betech 100pt Ltd
Four Square Buildings, Thomas Street
Heckmondwike, West Yorkshire, WF16 0LS
Telephone: 01924 411921
Email: sales@betech.co.uk
Opening hours: 8:00 to 17:00
