High-Power IPM Mid-Drive Motor Upgrade for Sur-Ron Ultra Bee
The Torp TM50 Speed is a performance-focused mid-drive traction motor engineered specifically for the Sur-Ron Ultra Bee. Built around an IPM (Interior Permanent Magnet) design and fitted with a high-resolution encoder, it delivers crisp throttle response, strong pull under load, and refined low-speed control—exactly what riders want for aggressive trail riding, fast fire roads, and high-demand builds.
With a 55 kW peak punch and robust thermal efficiency from its thick windings, the TM50 Speed is designed to push harder without cooking the windings—making it a serious step up for riders chasing more power with dependable control.
Why Riders Choose the TM50 Speed
- 55 kW peak power for short, hard bursts when you need maximum acceleration
- 24 kW continuous power for sustained load and longer pulls
- Ultra-low 2 mΩ motor resistance thanks to thick windings—reduced heat losses and better power delivery
- Up to 1200 A max phase current capability for high-power control with the right inverter
- 89 Nm max torque for strong drive out of corners and up steep climbs
- 49 Nm at 500 A for a clear, useful torque/current reference
- 1024-point encoder (4096) for smoother low-speed behavior and more precise motor control
- IP67 protection (lab tested) tested in distilled water for confidence in wet and dusty conditions
Compatibility & Recommended Setup
Controller / Inverter
The TM50 Speed is designed to work with the Torp TC1000 motor controller (inverter). This pairing is aimed at riders building a high-output Ultra Bee setup with stable, accurate control from the encoder feedback.
Battery Notes
The motor can run with the stock Ultra Bee battery. For riders aiming for optimal power, Torp recommends an 80 V nominal 22S battery with 92.4 V fully charged.
Technical Specifications
| Motor type | IPM (Interior Permanent Magnet) mid-drive traction motor |
| Application | Sur-Ron Ultra Bee |
| Peak power | 55 kW |
| Continuous power | 24 kW |
| Motor resistance | 2 mΩ |
| Max phase current | 1200 A |
| Max torque | 89 Nm |
| Torque @ 500 A | 49 Nm |
| Encoder | 1024 points (4096) |
| Ingress protection | IP67 (lab tested in distilled water) |
| Recommended controller | Torp TC1000 |
| Battery compatibility | Works with stock Ultra Bee battery; optimal with 80 V nominal 22S (92.4 V full) |
Who This Motor Is For
If you’re upgrading your Ultra Bee for higher peak power, stronger continuous output, and more refined control at low speed, the Torp TM50 Speed is built for that mission. Ideal for riders who want a premium motor upgrade to match a serious controller and battery setup—without compromising durability.
