This is why simply choosing the highest-power motor is often the wrong approach.
A better way to select a motor is to understand how motor voltage, torque, speed, gearing, thermal protection, and mechanical compatibility work together.
The Kunray MY1030 mid-drive BLDC motor provides a useful example. Available from 36V to 72V and from 1000W to 3000W rated power, the MY1030 platform is designed for applications ranging from light DIY conversions to higher-performance electric vehicles.
This guide explains the key factors to consider before choosing a mid-drive BLDC motor and shows how the MY1030 can be configured for different applications.
A motor's rated wattage is one of the easiest specifications to understand, but it does not tell the whole story.
The MY1030 family covers seven power configurations:
| Version | Rated Power | Peak Power | Rated Torque | Peak Torque | Rated Speed | Peak Speed |
|---|---|---|---|---|---|---|
| 36V 1000W | 1000W | 1500W | 3.2 N·m | 6 N·m | 3000 RPM | 5000 RPM |
| 48V 1000W | 1000W | 1500W | 3.2 N·m | 6 N·m | 3000 RPM | 5000 RPM |
| 48V 1600W | 1600W | 2500W | 4 N·m | 8.5 N·m | 3500 RPM | 6000 RPM |
| 48V 2000W | 2000W | 2800W | 5.4 N·m | 10 N·m | 4000 RPM | 6500 RPM |
| 60V 2000W | 2000W | 2800W | 5.4 N·m | 10 N·m | 4000 RPM | 6500 RPM |
| 60V 2500W | 2500W | 3000W | 6.2 N·m | 11 N·m | 4000 RPM | 6500 RPM |
| 72V 3000W | 3000W | 4000W | 6.8 N·m | 13.5 N·m | 4500 RPM | 7000 RPM |
The important point is that these versions are not simply different wattage labels.
As power increases, the motor's rated torque, peak torque, speed capability, current requirement, cable size, weight, and overall configuration also change.
For example, the 72V 3000W version is rated at 6.8 N·m of torque and can reach a listed peak torque of 13.5 N·m, while the 36V 1000W version is rated at 3.2 N·m with 6 N·m peak torque.
Therefore, choosing a motor should begin with the vehicle's requirements rather than the maximum number printed on the specification sheet.
For a chain-driven electric vehicle, the motor does not directly determine the force delivered to the wheel.
The drivetrain changes the motor's speed and torque through the sprocket ratio.
This makes the motor sprocket an important part of the system.
The MY1030 supports five official sprocket configurations:
Different sprocket sizes are designed around different chain systems and output-shaft configurations.
The general relationship is straightforward:
Smaller motor sprocket → stronger acceleration / lower potential top speed
Larger motor sprocket → higher potential top speed / less mechanical torque multiplication
However, gearing should not be evaluated independently.
Wheel diameter, vehicle weight, controller current, battery capability, and the intended operating environment all affect the final vehicle behavior.
This is why a motor with a lower rated power can still perform effectively in a lightweight vehicle when the gearing is appropriate.
The MY1030 is available in 36V, 48V, 60V and 72V configurations.
Voltage and current should be considered together rather than separately.
For a given electrical power level, increasing system voltage generally allows the required current to be reduced.
The MY1030 specifications illustrate this clearly.
The 2000W platform is available in both 48V and 60V versions:
This does not mean that a higher-voltage version is automatically better.
The correct voltage depends on the complete electrical system, including the battery, controller, wiring, and vehicle configuration.
The battery must match the motor's voltage platform, and its discharge capability must also cover the motor system's current requirements.
For the MY1030 range, the documented maximum rated current reaches 55A on the 72V 3000W version.
Peak power looks impressive on a product specification sheet.
But in real-world applications, heat management can determine whether a motor continues performing reliably.
The MY1030 uses an aluminum housing with integrated cooling fins. Instead of relying on an additional external cooling shell, the motor housing itself functions as part of the heat-dissipation structure.
The motor also uses natural air cooling.
This design has two practical implications.
First, the motor needs adequate airflow around its housing.
Second, a higher-power motor should not be treated as if it can operate continuously at its maximum output under every condition.
The MY1030 is specified with an S9 duty cycle, meaning it is intended for non-continuous variable-load operation.
Long periods of extreme load can create substantial heat accumulation.
Therefore, when installing a high-power motor, the cooling environment should be considered as part of the mechanical design rather than as an afterthought.
One of the most important upgrades of the MY1030 is that temperature sensing is standard across the entire product range.
The motor uses a KTY83-122 temperature sensor.
The sensor provides temperature-related electrical feedback to the controller, allowing the control system to monitor motor temperature.
When the temperature approaches the configured protection threshold, the controller can reduce output or trigger protection.
The exact temperature thresholds and protection strategy depend on the controller configuration and are not specified in the current MY1030 documentation.
This distinction is important.
A temperature sensor alone does not automatically guarantee thermal protection.
The controller must correctly support and use the temperature signal.
For a DIY conversion, this means that motor selection should include a check of the controller's temperature-input compatibility.
Another difference between motors can be found in how they are serviced.
The MY1030 uses an externally accessible Hall sensor design. The Hall components are located inside the end-cover area, allowing technicians to access them by removing the cover rather than disassembling the motor's internal winding and rotor structure.
This can make troubleshooting and replacement significantly easier.
For a DIY builder, this means less complicated maintenance.
For a distributor or commercial conversion shop, it can also reduce service time and simplify after-sales support.
This is an important design consideration that is often overlooked when comparing motors based only on wattage.
A motor is not just a source of power.
It is also a mechanical and electrical component that may need to be diagnosed, repaired, or replaced during its service life.
Even if the electrical specifications are correct, a motor can still be unsuitable if the mechanical interface does not match the vehicle.
The MY1030 has a motor housing diameter of approximately 108 mm, an end-face mounting pattern with M6 holes on a Ø95 mm distribution circle, and different overall motor lengths depending on the power version.
The 1000W versions have a listed total length of 124.5 mm, while the 1600W and higher versions listed in the manual are 134.5 mm.
The output shaft is another important consideration.
The MY1030 uses an M8 × 1.25 reverse-threaded shaft end.
More importantly, the motor uses two different output-shaft configurations depending on the sprocket group:
Compatible with:
Compatible with:
These two shaft types have different end profiles and should not be treated as interchangeable.
This means that choosing the sprocket is not simply a matter of selecting the chain.
The chain, sprocket and motor shaft must be considered as one mechanical system.
The MY1030 is available with or without a mounting bracket.
The choice depends mainly on the vehicle frame.
The documented bracket dimensions include a 72 mm longitudinal mounting-hole spacing, four Ø9 mm mounting holes, and a motor-center-to-bracket-base height of 58.5 mm.
Before ordering, these dimensions should be compared directly with the vehicle frame.
A practical way to approach selection is to start with the vehicle rather than the motor.
For lightweight electric scooters, small go-karts and similar applications, the 36V/48V 1000W versions provide a relatively compact 3.4 kg motor package.
For applications such as Razor MX650-class conversions, drift trikes and mini electric motorcycles, the 48V 1600W and 48V 2000W versions provide higher torque and power.
For light ATVs, adult go-karts and larger electric motorcycle conversions, the 60V 2000W and 60V 2500W versions offer higher output capability.
For higher-performance electric motorcycles and heavier conversions, the 72V 3000W version provides the highest rated power in the MY1030 range, with a listed peak power of 4000W.
These are application-oriented recommendations rather than guarantees of vehicle performance.
Actual acceleration, top speed and hill-climbing ability depend on the complete vehicle system, including vehicle weight, wheel size, gearing and battery discharge capability.
The MY1030 is positioned as an upgraded version of the MY1020 platform.
The most important changes are not simply about increasing power.
The upgrade focuses on four areas:
Thermal management
The MY1030 uses an integrated aluminum cooling-fin housing rather than relying on an external cooling shell.
Temperature monitoring
KTY83-122 temperature sensing is standard across the MY1030 range.
Mechanical sealing
The output shaft uses an upgraded sealing structure designed to provide improved resistance to water and mud intrusion.
Serviceability
The external Hall sensor design makes inspection and replacement easier.
This is a useful example of an important principle in motor selection:
A better motor is not necessarily the motor with the highest peak power.
For many real-world applications, thermal control, mechanical compatibility and serviceability can be just as important as headline power.
Instead of asking:
“Which 3000W motor should I buy?”
A better set of questions is:
This approach turns motor selection from a simple wattage comparison into a complete drivetrain design process.
Before purchasing a MY1030, confirm these five items:
Getting these factors right is often more important than simply choosing the largest motor available.
Yes. The MY1030 is a brushless DC motor with Hall sensors.
The MY1030 is available in 36V, 48V, 60V and 72V configurations, covering rated power from 1000W to 3000W.
Yes. KTY83-122 temperature sensing is standard across the documented MY1030 range.
The MY1030 is positioned as an upgrade/replacement motor for Razor MX650, MX500, SX500 and RSF650 applications. The correct voltage, sprocket and mounting configuration still need to be selected.
The documented options are 25H 11T, T8F 11T, #35 9T, #35 11T and 420 8T.
No. 25H and T8F use the A-type shaft, while #35 and 420 use the B-type shaft.
The motor is rated IP54, which provides protection against dust and splashing water. It should not be submerged or directly cleaned with a high-pressure water jet.
No. The current product documentation specifically states that the MY1030 cannot be used with the S966 instrument.
Selecting an electric motor should never be reduced to a single number such as “2000W” or “3000W.”
The real performance of a DIY electric vehicle comes from the interaction between:
Motor + Controller + Battery + Gearing + Wheels + Vehicle Weight + Thermal Management
The Kunray MY1030 demonstrates this system-level approach with seven power configurations, four voltage platforms, multiple sprocket options, integrated aluminum cooling fins, standard KTY83-122 temperature sensing and an externally serviceable Hall sensor design.
For builders and distributors, the most useful question is therefore not:
“What is the most powerful motor?”
It is:
“Which motor configuration best matches my vehicle, drivetrain and operating conditions?”
Once that question is answered, selecting the correct MY1030 version becomes much more straightforward.
