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FW version: Stable
PRELIMINARY

Product specification

Physical characteristics

  • width: 50.0 mm
  • height: 130 mm
  • thickness: 30 mm
  • weight: 350 g

TX controller drawings and 3D models

General specification

Parametervalue
Switching frequency20 kHz
Maximal motor electrical revolutions100000 eRPM
Minimal motor inductance15 μH
note

Minimal motor inductance is inductance of one winding (half of inductance between motor terminals). Motor inductance usually drops with increasing current due to saturation of motor magnetic circuit. This effect must be also considered when evaluating motor minimum inductance.

warning

If motor inductance is lower than specified, controller lifetime could be significantly reduced (even orders of magnitude). Low inductance increases electrolytic capacitors ripple current thus their temperature and lifetime.

Electrical specification

Input voltage rating

Maximum input voltage

Voltage variantTransistorsMaximum working voltageFull limitation voltageCritical error voltage (max)Li-ion battery nominal voltageLi-ion series cells count
10100 V84 V92 V95 V72.0 V20S

Minimum input (supply) voltage

Voltage variantTransistorsMinimum working voltageThreshold voltageCritical error voltage (min)
10100 V24 V22 V15 V

Terms explanation:

  • The controller delivers maximal current without limitation if the battery voltage is below the Maximum working voltage and above the Minimum working voltage.
  • The output current is proportionally limited if the battery voltage is above the Maximum working voltage and below the Full limitation voltage. This is indicated by the "Overvoltage" status.
  • The output current is fully limited if the battery voltage is above the Full limitation voltage and below the Critical error voltage (max). This state is indicated by the "Overvoltage" status. The controller automatically recovers if the voltage falls below the Full limitation voltage.
  • The controller falls into critical error if the battery voltage exceeds the Critical error voltage (max). The controller can be permanently damaged in this region and does not recover automatically, it needs to be turned OFF and ON again.
  • The output current is proportionally limited if the battery voltage is below the Minimum working voltage and above the Threshold voltage. This is indicated by the "Undervoltage" status.
  • The output current is fully limited if the battery voltage is below the Threshold voltage and above the Critical error voltage (min). This state is indicated by the "Undervoltage" status. The controller automatically recovers if the voltage rises above the Threshold voltage.
  • The controller falls into critical error if the battery voltage falls below the Critical error voltage (min). The controller does not recover automatically, it needs to be turned OFF and ON again.

DC bus capacitance

Voltage variantCapacitance [uF]
10738

Output current and power rating

If you put the controller to heatsink with 60°C temperature, you can reach the following nominal (continuous) parameters.

Nominal parameters12dxa1020
maximum power dissipation (60°C heatsink)102 W
nominal power for maximum input voltage10.2 kW @ 84 V
nominal phase current (amplitude)140 A (100 Arms)
battery current122 A

If the controller is at 27°C, you can reach the following peak parameters for indicated time. After that the controller will limit the output power.

Assembly variantPhase current (amplitude)Output powerTime to limitation
12dxa1020200 A14.5 kW @ 84 V (dP = 200 W)35 s
12dxa1020175 A12.7 kW @ 84 V (dP = 155 W)100 s
Phase current limit values *12dxa1020
Motor standstill (limited by hard-coded I2R limiter)140 A
Motor rotating (limited by hard-coded I2R limiter)200 A

* When motor is rotating, power losses are equally divided between all three phases. This significantly reduces risk of single phase overheating and the controller is able tu supply higher current.

Measurement accuracy

MeasurementAccuracy
Phase current±5 %
DC current±5 %
Input DC voltage±5 %
GPIO input voltage±2 %

Thermal specification

Maximum power losses

Controller maximum temperature is internally limited to approximately 100°C. The maximum output current (or maximum power losses) for this limiting temperature is given by the temperature of the heatsink. Dependencies are given in the following graphs.

info

All the data in the graphs below are valid for VECTOR control algorithm.

graph-iref-temp graph-dP-temp

Example on how to get heatsink thermal resistance

This example with AX controller shows on how to get required heatsink thermal resistance based on the required phase current amplitude and surrounding temperature.

  1. Define the required phase current (Iphase=50I_{phase} = 50 A for the example)
  2. Get maximum permissible heatsink temperature from the graph "Dependency of heatsink temperature on phase current amplitude" (Ths=57°CT_{hs} = 57°C from the example)
  3. Put the temperature value to the graph "Dependency of heatsink temperature on power losses"
  4. Get required power that needs to be dissipated by the heatsink (P=33P = 33 W from the example)

example

  1. Define the ambient operating temperature (Tamb=25T_{amb} = 25 °C for the example)
  2. Calculate required thermal resistance of the heatsink by using this equation Rhs=ThsTambP=5725330.97R_{hs}=\dfrac{T_{hs} - T_{amb}}{P} =\dfrac{57 - 25}{33} \approx 0.97 °C/W
  3. You can design your heatsink now!

Environmental specification

ParameterValue
Operation temperature (no limitation*)-20°C .. 60°C
Operation temperature (with power limitation*)-20°C .. 85°C
Humidity5 % .. 85 % (not tested)
Ingress of dust and water (internal electronics)IP67 - electronic is potted in silicone
Ingress of dust and water (power connectors)IP40 - connectors connected
Ingress of dust and water (signal connector, without sealing)IP10
Ingress of dust and water (signal connector, with sealing)IP55 - It withstands 10 minutes 10 cm underwaterr.

*power output limitation depends on cooling, not only on ambient temperature