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yikes
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how can i get greater performance from an standard inverter duty motor( marathon black max). I am in the process of buiding an inverter/controller to use as part of an EV conversion.
Note, the torque may depend on the load. If you're driving a fan, upping the rpm will increase the torque. If you take a 1.5 kW motor running a fan at it's rated power and increase the frequency by 50%, you'll increase the torque by 225% and the power output to 5 kW, with a corresponding increase in amperage -- almost certainly burning out the motor.GTrax said:Using modern inverter controllers can allow you to use motors well beyond their original specification without overheating, provided you do it with some care. For example, I can take a 2-pole 3-phase 1.5kW motor rated to run at 2850rpm (50Hz) to run safely at more than 4000 RPM (75Hz). The torque will drop off severely at 4700RPM, but that is well into very bad inefficient territory for other reasons anyway.
Not sure, but it could be a matter of cooling.yikes said:I am looking at the ac induction motors that some of the major ev cars use and they weigh only 200lbs or so but are rated at 50-60kw constant and 100-125kw for short periods of time. Is there any way i can take a widely available inverter duty motor(i.e. Marathon Black Max - 30hp) and get even cose to these kind of numbers. I will be using a custom inverter that will be programmable to whatever specs i choose. I was also hoping to make new custom motor case with liquid cooling added. Why does this motor that weighs close to 750lbs produce such inferior numbers caompared to the Siemens motors used at www.metricmind.com that weigh only 200lbs
The appllication will be for an EV vehicle.russ_watters said:Not sure, but it could be a matter of cooling.
From what i have been told, cooling of the motor by either water or oil can have an extremely beneficial effect on motor performance. This makes sense because of the heat dispersion which allows for operation at higher input levels.
What is the application?
A Marathon Black Max Inverter Duty Motor is a high-performance motor designed specifically for use with variable frequency drives (VFDs) in industrial applications. It is capable of handling the unique requirements and stressors of VFD operation, making it more efficient and reliable than standard motors.
The Marathon Black Max Inverter Duty Motor is designed with heavy-duty features such as oversized bearings, insulation, and cooling systems to handle the high frequency and voltage fluctuations of VFDs. It also has a specially designed rotor that reduces rotor losses and increases efficiency.
Using a Marathon Black Max Inverter Duty Motor can result in cost savings due to its increased energy efficiency and longer lifespan compared to standard motors. It also offers better control and more precise speed control when used with a VFD, making it ideal for applications that require variable speeds.
One potential drawback is that these motors are more expensive than standard motors, so the initial cost may be higher. Additionally, they may require specialized installation and maintenance, which can also add to the overall cost.
Marathon Black Max Inverter Duty Motors are best suited for applications that require variable speed control, such as conveyors, pumps, and fans. They are also commonly used in industries that require heavy-duty, continuous operation, such as manufacturing, oil and gas, and mining.