Innomotics 1PQ0 357-6WB80: A 200 kW IE4 Converter-Duty Motor Built for Constant Torque Loads
Not every motor is meant to run at one fixed speed. Conveyors, mixers, extruders and heavy mechanical drives often need full torque at low speed, and that is a very different demand from a fan or pump that only needs a trickle of torque when it slows down. Running a standard motor on a variable frequency drive (VFD) in those conditions can lead to overheating and early failure. The Innomotics 1PQ0 series was designed to solve exactly this problem, and this guide explains what that means for the 200 kW, 270 HP model 1PQ0 357-6WB80.
What Is the Innomotics 1PQ0 357-6WB80?
The Innomotics 1PQ0 357-6WB80 is a three-phase squirrel-cage induction motor rated 200 kW (270 HP) from Innomotics' 1PQ0 series. In Innomotics' India price list, the 1PQ0 series is described as separately cooled, converter-duty motors for constant torque applications. Your listing also marks this model as IE4, the Super Premium Efficiency class.
In plain terms: it is a motor made to be driven by a VFD, to deliver full torque even at low speeds, and to stay cool while doing it.
What "Converter Duty" and "Constant Torque" Mean
Converter duty means the motor is designed to be supplied by a frequency converter (VFD) rather than directly from the mains. VFD output is not a clean sine wave, and it puts extra electrical stress on a motor's insulation and bearings.
Constant torque describes loads that need the same torque across the whole speed range, including very low speeds. Typical examples are conveyors, extruders, mixers, crushers, positive-displacement pumps and hoisting drives. This is more demanding than a centrifugal fan or pump, where torque requirement falls as speed drops.
Why the 1PQ0 Uses Separate Cooling
A standard motor cools itself with a fan mounted on its own shaft. That works well at full speed, but when a VFD slows the motor down, the shaft-mounted fan slows down too, and cooling drops exactly when constant-torque loads are still generating full heat.
The 1PQ0 solves this with separate forced cooling (IC416), an independent blower motor that keeps airflow constant regardless of the main motor's speed. Innomotics' price list notes that the 1PQ0 list price is inclusive of the blower and an inverter-grade insulation scheme, so these come as part of the motor rather than as extras you have to specify separately.
Key Specifications (1PQ0 Series)
From Innomotics' published India motor price list for the 1PQ0 series:
- Degree of protection: IP55
- Insulation class: F, with temperature rise managed for VFD operation
- Ambient temperature: 50°C
- Duty type: S1 (continuous)
- Supply: 415V, 50Hz
- Cooling: IC416, separately driven blower
- Insulation: inverter-grade insulation scheme included
- Efficiency class (per your listing): IE4
Important bearing note: Innomotics states that for 1PQ0 motors in frame sizes 280 and above, insulated bearings are mandatory when running in constant torque mode below 5 Hz. This protects the bearings from damaging currents that VFDs can induce. Make sure your drive and motor specification account for this.
What IE4 Means for Running Costs
IE4 is the Super Premium Efficiency class under IEC 60034-30-1. A higher efficiency class means less electrical energy is lost as heat. For a 200 kW motor running long hours, even a small efficiency gain adds up to substantial energy and cost savings over the motor's life, and Innomotics notes that IE4 motors also contain more active material, so they run cooler and weigh somewhat more than IE3 equivalents. If your site runs the motor many hours a day, the efficiency class matters as much as the purchase price.
Where This Motor Gets Used
- Conveyors and material handling that must start under load and run at variable speeds
- Extruders and mixers needing full torque at low speeds
- Crushers, mills and heavy process machinery
- Positive-displacement pumps and compressors
- Cement, steel, mining and chemical plants with demanding continuous duty
- Any VFD-driven application where cooling at low speed would otherwise limit a standard motor
How to Choose the Right Motor
- Confirm the load type. If your load is a centrifugal fan or pump with falling torque at low speed, a standard VFD-capable motor may be enough. For true constant torque loads, a separately cooled motor like the 1PQ0 is the right category.
- Check speed and poles. The "6" in the ordering code points to a 6-pole design, which typically runs around 1000 RPM on 50Hz mains. Confirm rated speed from the nameplate or datasheet.
- Verify frame and mounting. Confirm frame size and mounting arrangement against your baseplate and coupling.
- Plan the drive. Match the VFD rating to the motor, and confirm cable length, filter and bearing-current mitigation requirements with your drive supplier.
- Provide power for the blower. The separate cooling blower needs its own supply and should be interlocked with the drive so the motor never runs without cooling.
For other Innomotics motor options, see our Innomotics 1PQ8 Compact Motors guide, Severe Duty Motors guide, and Cast Iron Motors guide.
Why Buy a Genuine Innomotics Motor from SB Smart
A 200 kW motor is a significant investment, and a converter-duty motor has specific requirements that a generic substitute may not meet. SB Smart (sbsmart.in), the official e-commerce portal of S.B. Syscon Pvt. Ltd., supplies genuine Innomotics motors across cast iron, compact, crane duty, fire-fighting pump, flame-proof and VFD-duty ranges, with GST invoicing, competitive B2B pricing, and PAN India delivery. Their technical team can help confirm the exact configuration for your drive before you order.
Frequently Asked Questions (FAQ)
1. What is the Innomotics 1PQ0 series? It is Innomotics' range of separately cooled, converter-duty motors for constant torque applications, designed to run on a VFD while delivering full torque at low speeds.
2. Why does the 1PQ0 have a separate cooling blower? At low speeds a shaft-mounted fan cools poorly. The independent blower keeps airflow constant regardless of motor speed, so the motor doesn't overheat on constant torque loads.
3. What is constant torque duty? It is a load where the same torque is needed across the speed range, including low speeds, such as conveyors, extruders, mixers and crushers.
4. Does this motor need insulated bearings? For 1PQ0 motors in frames 280 and above, Innomotics states that insulated bearings are mandatory when operating in constant torque mode below 5 Hz.
5. What does IE4 mean? IE4 is the Super Premium Efficiency class under IEC 60034-30-1, meaning lower energy losses and lower running costs than IE3 motors.
6. Can I run this motor direct-on-line? It is designed as a converter-duty motor for VFD operation. Check the datasheet or ask your supplier before considering any direct-on-line use.
7. What is the speed of this motor? The "6" in the model number indicates a 6-pole design, typically around 1000 RPM at 50Hz. Confirm the rated speed on the nameplate or datasheet.
8. Where can I buy a genuine Innomotics 1PQ0 motor in India? SB Smart (sbsmart.in) supplies genuine Innomotics motors, including the 1PQ0 357-6WB80, with GST invoicing, technical support, and PAN India delivery.
Final Thought
When a load needs full torque at low speed, the motor's cooling and insulation matter as much as its kW rating. The Innomotics 1PQ0 357-6WB80 combines IE4 efficiency, a dedicated cooling blower and inverter-grade insulation, so a 200 kW constant torque drive can run reliably across its speed range instead of fighting the limits of a standard motor.
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