How fast can a 1500w motor run?
4 Answers
The speed depends on the specific voltage and current. For example, an electric vehicle with a 72v32a battery and a 1500w motor can run about 20 kilometers, and the speed of a 1500w motor can reach 180 km/h. Motor Introduction: In a circuit, a motor is represented by the letter M (the old standard used D). Its main function is to generate driving torque, serving as a power source for electrical appliances or various machinery. A generator is represented by the letter G in a circuit, and its main function is to convert mechanical energy into electrical energy. Working Principle of a DC Generator: The direction of the force on the conductor is determined by the left-hand rule. This pair of electromagnetic forces forms a torque acting on the armature, known as electromagnetic torque in a rotating motor. The direction of the torque is counterclockwise, attempting to rotate the armature counterclockwise. If this electromagnetic torque can overcome the resisting torque on the armature (such as the resisting torque caused by friction and other load torques), the armature can rotate counterclockwise.
Last time I tested a 1500W modified electric motor, the no-load top speed could reach around 85 km/h, but it wasn't that fast when actually installed with a 48V battery and carrying a passenger. I weigh 70 kg, and on flat roads, the speed stabilized around 58 km/h. Battery capacity is particularly crucial—using low-discharge lead-acid batteries dropped the speed to just over 40 km/h, while switching to a 20Ah lithium battery generally got it up to 55 km/h. Wind resistance is also quite noticeable; riding in a crouched position adds at least 5 km/h compared to sitting upright. If you encounter an uphill or headwind, it's not unusual for the speed to drop by half. The controller also needs to be matched—a 35A current limit is about 7-8 km/h slower than a 45A one. Overall, it's sufficient for city commuting, but still falls short for highway speeds.
A 1500W motor paired with a 72V battery can reach approximately 60-65 km/h, which is the real-world data I've tested across three vehicles. Veterans in the modification scene know that tire size makes a significant difference: using wide tires can slow you down by at least 5 km/h compared to narrow ones, but they offer much better grip. Recently, I tested a set of lithium iron phosphate batteries—at full charge, the top speed was 72 km/h, but after 30 km, it dropped to 53 km/h, so don't just rely on the displayed maximum value. If the rear swing arm lacks rigidity, the rear wheel may wobble during acceleration, affecting speed. Also, motor temperature is crucial; continuous uphill climbs exceeding 60°C will cause power output to drop, so it's best to install heat sinks.
My all-aluminum electric scooter with a 1500W motor can reach a top speed of 63 km/h on flat ground when fully charged. Wheel size makes a huge difference: 11-inch wheels are about 8 km/h faster than 8-inch wheels. Voltage switching is fascinating: on a 60V platform it runs just over 50 km/h, but switching to 96V boosts it to 75 km/h, though you'll need a compatible controller. The most surprising factor was tire pressure: 2.0 pressure is a full 12 km/h slower than 3.0 - now I understand how important regular pressure checks are. When carrying a 15kg backpack, speed drops to 48 km/h, and battery aging makes it even worse.
