The Torp TM25 is an IPM mid-drive traction motor (interior permanent magnet motor) designed as a drive motor upgrade for the Sur-Ron Light Bee electric off-road motorcycle (e-moto). It supports a wide 48–120 V system range and delivers 13 kW continuous power for sustained riding loads.
The TM25 can run position feedback using either a Hall sensor (Hall) or an encoder, which lets you match the feedback type to your inverter setup. It is built to work with Torp TC500 1.X/2.X and Torp TC1000 1.X/2.X motor controllers (inverters), while it is not compatible with Torp TC500 HW 1.0, HW 1.1, or HW 1.2 versions.
This motor uses air cooling (air-cooled) and comes in a compact mid-mounted format with multiple mounting points. It is also rated IP67 in lab testing in distilled water, although the connectors are not waterproof.
Benefits
- 13 kW continuous output at 48–120 V for steady traction power from the mid-drive layout.
- Peak power up to 40 kW on a 120 V system, with specified peaks of 27 kW at 72 V and 31 kW at 80 V.
- Low 3.4 mΩ motor resistance, listed as three times lower than the stock SurRon motor.
- Selectable position feedback via Hall sensor or encoder to suit controller requirements.
- 1024 (4096) point encoder option for higher position resolution with Torp controllers.
- Up to 800 A phase current capability for high-power configurations with supported inverters.
- IP67-rated housing with laboratory testing in distilled water, while connectors remain non-waterproof.
Who is this for
This Torp TM25 traction motor is for the Sur-Ron Light Bee platform as a mid-drive drive motor upgrade. It targets builds that need compatibility with Torp TC500 1.X/2.X or Torp TC1000 1.X/2.X inverters and that plan for high phase-current control.
The TM25 also includes multiple mounting points, so it can be installed in other electric vehicles when the geometry matches. It specifically suits projects that require a centrally mounted motor and air cooling in the drivetrain layout.
Technical specs
| Product type | Traction motor (traction motor), mid-drive (mid-drive) |
| Motor type | IPM motor (interior permanent magnet) |
| Voltage range | 48 V – 120 V |
| Continuous power | 13 kW |
| Peak power | 27 kW @ 72 V; 31 kW @ 80 V; 40 kW @ 120 V |
| Rated speed | 6000 rpm |
| Maximum speed | 10,000 rpm |
| Position sensor | Hall sensor or encoder |
| Encoder resolution | 1024 (4096) points |
| Maximum magnet temperature | 150 C |
| Phase current | Up to 800 A |
| Torque constant (Kt) | 0.105 Nm/A |
| Torque @ 500 A | 52.5 Nm |
| Torque @ 700 A | 67 Nm |
| KV rating | 85 |
| Motor resistance | 3.4 mΩ |
| Temperature sensor | PT1000 (resistive temperature sensor) |
| Efficiency | Up to 95% |
| IP rating | IP67 |
| Weight | 10 kg |
| Motor size | 115 × 165 mm |
| Mounting | Mid (central) |
| Pole pairs | 5 |
| Cooling method | Air cooling (air-cooled) |
Why choose
The TM25 combines an IPM rotor design with a mid-drive package intended for the Sur-Ron Light Bee upgrade path. It is specified for high electrical load conditions with up to 800 A phase current and a low 3.4 mΩ resistance, which supports demanding power setups when paired with the correct inverter.
It also gives you a clear feedback choice between Hall sensing and a 1024 (4096) point encoder, which aligns with Torp controller tuning. Its IP67-rated housing supports off-road exposure, while the connector limitation keeps water protection planning in your build scope.
FAQ
Which bike is the Torp TM25 designed for?
- The TM25 is designed as a traction motor upgrade for the Sur-Ron Light Bee electric off-road motorcycle (e-moto).
- The motor uses a mid-drive (central) mounting format specified for that platform.
Which Torp controllers (inverters) are compatible with the TM25?
- The TM25 is compatible with Torp TC500 1.X/2.X and Torp TC1000 1.X/2.X motor controllers (inverters).
- The TM25 is not compatible with Torp TC500 HW 1.0, HW 1.1, or HW 1.2.
What voltage systems does the Torp TM25 support?
- The TM25 supports 48 V to 120 V systems.
- The motor is rated at 13 kW continuous power across that voltage range.
How much peak power can the TM25 produce?
- The TM25 is specified for 27 kW peak at 72 V.
- The TM25 is specified for 31 kW peak at 80 V.
- The TM25 is specified for 40 kW peak at 120 V.
Does the TM25 use a Hall sensor or an encoder?
- The TM25 supports Hall sensor feedback or an encoder for position feedback.
- The encoder option is listed at 1024 (4096) points for higher resolution control.
Is the TM25 waterproof?
- The TM25 housing carries an IP67 rating based on laboratory testing in distilled water.
- The motor’s connectors are not waterproof, so sealing and routing remain important.
Can the TM25 be installed in vehicles other than the Sur-Ron Light Bee?
- The TM25 has multiple mounting points that allow installation in other EV projects when geometry fits.
- The motor is designed around mid (central) mounting and air cooling requirements.
Search terms: Torp TM25 mid-drive traction motor, IPM motor (interior permanent magnet), Sur-Ron Light Bee motor upgrade, Torp TC500/TC1000 inverter compatible, Hall sensor, encoder 1024 (4096) points, 48–120 V e-moto drive motor.
