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HIGH TORQUE LOW SPEED Permanent magnet Synchronous motors / DIRECT TORQUE MOTORS are used in:
* Pharmaceutical machinery --- RMG, Tablet press
· Gearless Elevators
Advantages of HIGH TORQUE LOW SPEED Permanent magnet Synchronous motors / DIRECT TORQUE MOTORS in Direct Drive Technology
Conventional systems commonly have a mechanical transmission which can consist of gears, gearheads, belts/pulleys, or cams connected between the motor and the load. With Direct Drive (HIGH TORQUE LOW SPEED Permanent magnet Synchronous motors / DIRECT TORQUE MOTORS) technology, the mechanical transmission is eliminated, and the motor is coupled directly to the load.
This results in added advantages as:
· Direct connection to load increases torsional stiffness
· Improved positioning accuracy
· Backlash free operation
· Low audible noise
· No maintenance for lubrication
Why Use Direct Drive / DIRECT TORQUE MOTORS Technology?
a) Increased Accuracy and Repeatability: The increased accuracy and efficiency of direct drive technology results in a higher quality product out of the machine:
b) Better Control: Torque and current have direct relation and so torque can be easily determined, and c controlled
c) Improved Reliability and Zero Maintenance: Gears, belts, and other mechanical transmission parts break. By eliminating these parts and using direct drive motors, the reliability of the machine is improved. Gearheads require periodic lubrication and/or replacement in aggressive start/stop applications. Belts require periodic tightening. There are no time-wear components in a direct drive motor and consequently they require zero maintenance.
d) Fewer Parts: With direct drive motors / DIRECT TORQUE MOTORS, all you need is the motor and the mounting bolts. This often replaces many parts including brackets, guards, belts, pulleys, tensioners, couplings, and bolts, resulting in:
e) High starting torque gives inertia advantage: Inertia matching limitations of mechanical transmission systems often force machine designers to use a larger motor than would otherwise be required just to satisfy the inertia matching requirement. Such sizing conventions are not required with direct drive technology.
f) Reduced Audible Noise: Machines with DDR motors have audible noise levels less than the same machine with a mechanical transmission.
Direct Drive / DIRECT TORQUE technology uses HIGH TORQUE LOW SPEED Permanent magnet Synchronous motors with feedback. The features of such a motor as compared to an induction motor are as below:
a) Permanent Magnet Synchronous motor can produce very high starting torque @ 300% of Rated Value.
b) Current drawn by Permanent Magnet Synchronous motor is directly proportional to torque. You can calibrate / estimate machine torque directly from current reading. This is not possible with Induction Motor.
c) Permanent Magnet Synchronous motor speed range is 0 – 150 or 0 – 300 RPM with Full Rated Torque depending on machine requirement. There is no necessity to use a Gear Box.
d) PMSM has high efficiency of @ 85 to 90% whereas Combined efficiency of Induction Motor & Gear Box is @ 75%. (Gear Box 0.9 X Motor 0.83 = 0.75). Thus, will result in considerable saving in power consumption.
e) Generally, cost difference in PMSM & Induction Motor with Gear Box is recovered by power saving over a period of 1 to 1 ½ years with two shifts working.
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