Rewinding large Tesla drive units (LDU)

While Matris is not an electric vehicle repair shop, we are specialists in the rewinding and servicing of Electric Drive Units (EDU). Since 2023, we have been developing and upgrading our service to a premium level. We are confident in stating that the drive units refurbished in our service center are more durable and better protected. The Knowledge Library is constantly being upgraded and updated.

While we are not limited to any particular brand, we are currently focused on Tesla LDU for Tesla Model S (2012–2020), Tesla Model X (2016–2021), and Mercedes-Benz B250e (also known as B-Class Electric Drive).

The reality of the electric vehicle market

Although many articles can be found written about how eMoblity is limited by battery technology, range and charging infrastructure, the biggest problem is that vehicles slowly coming out of factory warranty do not have the necessary support from a network of unauthorised repairers.

Improvements in Tesla LDU Stator Refurbishment

3-5% increase in capacity
Enhanced heat dissipation using Matris epoxy resin
Reduce stator overheating problems
3% increase in phase conductor area
Exceptional GΩ-level durability (compared to OEM min. 4MΩ), making it virtually indestructible

We are highly specialized in the remanufacture of the electrical part of electric vehicle powertrains. If you wish to utilize our expertise and services, please send the electro-drive part of the unit (stator and rotor) to our address. After receipt, disassembly, and inspection of the condition, we will send you an offer for refurbishment. Once you confirm it, we will proceed with the work. You always receive a lifetime Matris warranty on the work performed, which covers the stator rewinding. The warranty does not cover external causes of failure, such as coolant leakage.

*We are not a garage and do not service vehicles; nor do we dismantle powertrains.

What is replaced

Winding material

Every winding is performed with completely new copper wire. All phase connectors are also replaced with new ones — copper, nickel-plated, and dimensioned according to OEM specifications. We also replace the temperature sensors (NTC 100 kΩ thermistors) with new ones, equipped with green and blue cables for the connector.

Protection and testing

The new epoxy compound completely covers the entire stator — unlike Tesla's factory version, which only covers the winding heads. Before dispatch, every stator is tested with a Schleich MTC-2 device, and we guarantee GΩ-level insulation durability.

Surge test deviation U-V-W	Resistance test 1000 V	Hi Pot DC step test 2000 V
1516 V EAR = 5.7% Area = 1.3% Cor. = 0.1% Attenuation = 1.0% Zero Crossing = 1.4% Inductance = 0.07 mH	1005 V 12.037 MOhm (40.0 °C Thermoplastic) 37.463 MOhm (23.6 °C) Imax1 = 50.45 μA Imax2 = 26.85 μA	1503 V 0.11 μA (40.0 °C Thermoplastic) 14.297 MOhm (23.6 °C) Imax1 = 0.11 μA Imax2 = 0.11 μA
FAIL	FAIL	FAIL

Surge test deviation U-V-W	Resistance test 1000 V	Hi Pot DC step test 2000 V
1516 V EAR = 2.1% Area = 0.4% Cor. = 0.0% Attenuation = 0.4% Zero Crossing = 0.4% Inductance = 0.07 mH	1005 V >100.00 GOhm (40.0 °C Thermoplastic) >100.00 GOhm (23.8 °C) Imax1 = 8.71 μA Imax2 = 0.00 μA	2005 V 0.04 μA (40.0 °C Thermoplastic) 55.39 GOhm (23.8 °C) Imax1 = 3.46 μA Imax2 = 0.04 μA
PASS	PASS	PASS

Trust the experts

Every stator that leaves our service center is better protected, more durable, and higher performing than the OEM unit. We offer a lifetime Matris warranty on Tesla LDU stator rewinding.*

* Limited warranty. Does not cover coolant ingress or damage originating from outside the stator.

*We are not a vehicle service center and do not disassemble drive units — we regularly rewind stators, and we are also capable of rotor repairs upon request.