Innotec Power publishes eleven 72 V motors between 18 and 25 kW continuous. At the 15-minute rating the same eleven cover 36.2 to 44.6 kW. They are built on two frames, the 255 and the larger 360, in both surface-magnet and interior-magnet rotors. Continuous torque runs from 39 to 99.6 Nm and rated speed from 1800 to 5100 rpm, so at this power level the choice is not really about kilowatts at all — it is about which torque and speed pair suits the driveline.
| Model | Continuous | Continuous torque | 15 min | 15 min torque | Rated speed | Rotor |
|---|---|---|---|---|---|---|
| 255-HZS72-250 | 20.0 kW | 39.0 Nm | 41.6 kW | 88.3 Nm | 5100 rpm | SPM |
| 255-AZZI72-250 | 20.0 kW | 42.0 Nm | 39.7 kW | 79.0 Nm | 4600 rpm | IPM |
| 255-AZZS72-250 | 18.0 kW | 48.5 Nm | 37.0 kW | 96.0 Nm | 3600 rpm | SPM |
| 255-AEZS72-250 | 18.0 kW | 72.8 Nm | 36.6 kW | 144.0 Nm | 2400 rpm | SPM |
| 255-AHZS72-250 | 20.0 kW | 99.6 Nm | 38.7 kW | 196.3 Nm | 1900 rpm | SPM |
| 255-BZZI72-250 | 20.0 kW | 70.0 Nm | 39.8 kW | 133.9 Nm | 2900 rpm | IPM |
| 255-BZZI72-500 | 25.0 kW | 65.0 Nm | 39.0 kW | 115.8 Nm | 3700 rpm | IPM |
| 255-BZZS72-250 | 18.0 kW | 96.9 Nm | 36.2 kW | 192.2 Nm | 1800 rpm | SPM |
| 360-CZS72-300 | 20.0 kW | 67.4 Nm | 43.4 kW | 132.0 Nm | 3000 rpm | SPM |
| 360-DZS72-300 | 22.0 kW | 88.8 Nm | 44.6 kW | 175.7 Nm | 2400 rpm | SPM |
| 255-AGZS72-250 | 19.7 kW | 94.1 Nm | 38.8 kW | 185.4 Nm | 2000 rpm | SPM |
How to read the three duty points
Every rating on this page is stated three times: continuous at rated current, then at 60 minutes, then at 15 minutes. The continuous figure is what the motor will hold indefinitely with its stated cooling. The 15-minute figure is roughly double it, and it is the number that matters for a hoist, a launch, a hill climb or any load that peaks and then rests.
Sizing on the continuous figure alone leaves capability on the table; sizing on the 15-minute figure alone overheats the magnets. Pick the frame whose continuous rating covers the duty cycle average and whose 15-minute rating covers the worst peak.
Same power, very different machines
All eleven sit near 20 kW, and that is where the similarity ends. 255-HZS72-250 delivers 39.0 Nm at 5100 rpm. 255-BZZS72-250 delivers 96.9 Nm at 1800 rpm — two and a half times the torque at a third of the speed, for the same continuous power.
The high-speed models suit a driveline that already has reduction gearing and wants a small, light motor. The low-speed models suit direct or single-stage drive, where the gearbox you avoid is worth more than the mass you add. If a gearbox is already in the design, start at the fast end of this table; if you are trying to delete one, start at the slow end.
Surface magnet or interior magnet
8 of the eleven are surface-magnet (SPM) and 3 are interior-magnet (IPM). SPM gives the higher torque per amp and the simpler thermal picture. IPM adds reluctance torque and takes field weakening better, so it holds power further above base speed — useful when the application needs a wide constant-power band rather than maximum torque at one point. The IPM motor guide covers the trade in detail.
Where 20 kW at 72 V is used
72 V is the practical ceiling for equipment that has to stay outside high-voltage safety requirements, which is why this power band shows up in utility and work vehicles, small marine drives, agricultural and off-highway machines, industrial hydraulic power units, and material handling. At 20 kW a 72 V bus draws roughly 300 A continuous, so cable sizing, contactor rating and controller current become as much of the design as the motor itself.
72 V or 48 V at this power
Innotec builds 48 V motors up to 27.3 kW, so 20 kW is reachable on either bus. The difference is current: the same power on 48 V pulls around 450 A instead of 300 A, which means heavier cable, a larger controller and more resistive loss. If the pack is already 48 V the motor exists — see the 48 V range — but for a new design at this power, 72 V is the easier system. Lower down the range, at 10 kW, the argument is much weaker.