Product specification

Physical characteristics

• width: 80.6 mm
• height: 139.3 mm
• thickness: 47 mm (53 mm with M6 cable lug and M6 screw)
• weight: 700 g

SX controller drawings and 3D models

• 3D model
• Drawing

General specification

Parameter	value
Switching frequency	20 kHz
Maximal motor electrical revolutions	100000 eRPM
Minimal motor inductance	15 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 variant	Transistors	Maximum working voltage	Full limitation voltage	Critical error voltage (max)	Li-ion battery nominal voltage	Li-ion series cells count
08	80 V	60 V	67 V	75 V	50.4 V	14S
10	100 V	76 V	83 V	92 V	64.8 V	18S
11	100 V	84 V	92 V	95 V	72 V	20S

Minimum input (supply) voltage

Voltage variant	Transistors	Minimum working voltage	Threshold voltage	Critical error voltage (min)
08	80 V	24 V *	22 V *	15 V *
10	100 V	24 V *	22 V *	15 V *
11	100 V	24 V *	22 V *	15 V *

Note *: Controller variants with LM5008 supply may need minimum voltage 32 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 variant	Capacitance [uF]
08	2860
10	1950
11	1950

Output current and power rating

VECTOR driver

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

Nominal parameters	24dxa0840, 24kxa0840	24dxa1040, 24kxa1040	24dxa1140, 24kxa1140
Maximum power dissipation (60°C heatsink)	240 W	240 W	275 W
Nominal power for maximum input voltage	14.8 kW @ 60 V	17.4 kW @ 76 V	23.2 KW @ 84 V
Nominal phase current	285 A (201 Arms )	265 A (187 Arms)	320 A (226 Arms)
Battery current	250 A	232 A	270 A

If the controller is at 35°C, you can reach the following peak parameters for 10 seconds, after that the controller will limit the output power.

Peak parameters	24dxa0840, 24kxa0840	24dxa1040, 24kxa1040	24dxa1140, 24kxa1140
Peak power (10 sec)	19 kW @ 60 V (dP = 380 W)	22.2 kW @ 76 V (dP = 380 W)	27.8 kW @ 84 V (dP = 380W)
Peak phase current (10 sec, amplitude)	366 A	337 A	382 A

BLDC driver

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

Nominal parameters	24dxa0840, 24kxa0840	24dxa1040, 24kxa1040	24dxa1140, 24kxa1140
maximum power dissipation (60°C heatsink)	240 W	240 W	275 W
nominal power for maximum input voltage	16.8 kW @ 60 V	20 kW @ 76 V	26 kW @ 84 V
nominal output current (amplitude)	280 A	265 A	310 A
battery current	283 A	268 A	312 A

If the controller is at 35°C, you can reach the following peak parameters for 10 seconds, after that the controller will limit the output power.

Peak parameters	24dxa0840, 24kxa0840	24dxa1040, 24kxa1040	24dxa1140, 24kxa1140
peak power (10 sec)	21.6 kW @ 60 V (dP = 380 W)	25.9 kW @ 76 V (dP = 380 W)	31.2 kW @ 84 V (dP = 380 W)
peak phase current (10 sec)	360 A	340 A	371 A

Phase current limit values *	24dxa0840, 24kxa0840, 24dxa1040, 24kxa1040	24dxa1140, 24kxa114
Motor standstill (limited by hard-coded I2R limiter)	300 A	300 A
Motor rotating	400 A (limited by maximum value of iref and ipeak)	424 A (limited hard-coded by I2R limiter)

* 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

Measurement	Accuracy
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.

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 ($I_{phase} = 50$ A for the example)
2. Get maximum permissible heatsink temperature from the graph "Dependency of heatsink temperature on phase current amplitude" ($T_{hs} = 57°C$ 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 ($P = 33$ W from the example)

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

Environmental specification

Parameter	Value
Operation temperature (no limitation*)	-20°C .. 60°C
Operation temperature (with power limitation*)	-20°C .. 85°C
Humidity	5 % .. 85 % (not tested)
Ingress of water (Superseal connector unmated)	IPX0
Ingress of water (Superseal connector mated)	IPX7

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

Standards compliance

EMC

Subject	Standard
Bulk Current Injection	ISO 11452-4: 2020
Radiated Immunity	ISO 11452-2: 2019
Radiated Emissions	ČSN EN 55025, ed. 3, art. 6.5

Mechanical tests

Subject	Standard
Sinusoidal vibration	ČSN EN 60068-2-6 ed. 2, test Fc*
Vibration test	ČSN EN 60068-2-64 ed. 2, test Fh**

*Sweep rate: 1 oct./min; Number of Test Cycles: 20 sweep cycles each axis; Axes of vibration: 3 (X, Y, Z); Acceleration profile according to Class 5M3 (ČSN EN 60721-3-5); Requested sine acceleration profile: 7.5 mm for 2 Hz ≤ f ≤ 8 Hz, 20 m/s2 for 8 Hz < f ≤ 200 Hz, 40 m/s2 for 200 Hz < f ≤ 500 Hz

**Acceleration profile according to Class 5M3 (ČSN EN 60721-3-5); Requested ASD level: 3.0 (m/s2)2/Hz for 10 Hz ≤ f ≤ 200 Hz, 1.0 (m/s2)2/Hz for 200 Hz < f ≤ 500 Hz; Effective acceleration: 29.5 m/s2; DOF: 190; σ-clipping: 3; Pre-test acceleration levels: -9 dB for 4 min 30 s, -6 dB for 15 s, -3 dB for 15 s; Duration: 8 hours each axis; Axes of vibration: 3 (X, Y, Z)