The TMdrive-10e2 SPR Slip Power Recovery Drive System for Wound Rotor Motors belongs to the TMdrive-10e2 family of low-voltage system drives designed to lower the cost of ownership with numerous space-saving and maintenance features.

When wound rotor motors are employed, the TMdrive-10e2 Slip Power Recovery Drive (SPR) can help make operations more efficient. The drive operates at high power factor with low harmonics. When operating below base speed, the drive returns power to the line, saving on power consumption. The TMEIC SPR drive also allows operation above synchronous speed enabling increased throughput, within the mechanical limits of the system. It is also ideal for retrofits of existing, previous-generation current source SPR drives.

With the TMdrive-10e2 SPR, wound rotor motors have entered the 21st Century offering:

  1. PWM converters
  2. High power factor operation
  3. High reliability
  4. Low cost of ownership
TMdrive-10e2 SPR Features and Benefits
Design Feature
Customer Benefit

Based on Standard Drive – Standard TMEIC low voltage drive hardware is applied for use as a wound rotor motor drive

Reliable Drive Hardware & Available Spare Parts – modifications to the TMdrive-10 drive hardware are required for use as a slip power recovery drive

High Power Factor, Low Harmonic Utility Interface – Source converter feeding power back into utility operates at unity power factor.

Reduction of Current to Motor and Reduced Harmonics – Higher PF operation means reduced reactive power demands and better voltage stability Reduced harmonics result in no filtering on utility supply

Low Harmonic Currents in Rotor Circuit – PWM converter connected to rotor provides sinusoidal current to rotor

Negligible Rotor Heating and Smooth Motor Torque – Sinusoidal current in rotor circuit results in negligible rotor heating and torque pulsations

Latest Drive Control Technology – Based on current production drive control hardware and firmware.

Intelligent Drive Control – Using modern drive control provides the latest in drive communications, operating accuracy, and diagnostics

Heat Pipe Cooling Technology – The cabinet-based IGBT power bridges use heat pipe cooling technology.

Reduces Footprint and Lowers Audible Noise – This cooling system reduces the space required for effective IGBT cooling. It also lowers the speed of the cooling air, thereby reducing audible noise

Precise control of wound rotor motor while not wasting energy

Drive controls motor torque (rotor current) directly; motor does not have to increase slip (slow down) to increase torque

Slip power is recovered and fed back to power system when the motor is operating below synchronous speed

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