!Note: For the correct type of the controller consult with the controller producer – especially for Sevcon and RMS controllers.
Most controllers use sensors for controlling position, direction and rotation speed of the motor. If the controller has the sensor-
less option, then a sensor is not needed, but in this case only the direction of motor rotation can be defined (by changing
positions of two phase cables). More information about sensors is written in Item 8.
Recommended sensors for different controllers:
- Most controllers can drive the EMRAX motor with encoder, 2 poles resolver or hall sensors. Sensors that are available from the
EMRAX Company are (they are mounted on the motor by a special bracket or in the motor):
LTN RE15_1_A15 (2 poles resolver) for Unitek Bamocar D3 controller
TLTN RE15_1_A15 (2 poles tandem resolver) for two Unitek Bamocar D3 controllers; when using two controllers with
one motor (doubled phase connectors - 2xUVW are needed) or for EMRAX TWIN
RLS RM44SC (encoder) for Emsiso emDrive 500 and emDrive H300
RLS RM44AC (encoder) for Sevcon controllers
HS SS411P (three hall sensors; possibility of doubled hall sensors) for Emsiso controllers
- Some controllers (e.g. RMS) require 10 poles resolvers, which are more accurate and can deliver a better signal to the
controller. Then the controller can deliver a better current commutation to the motor. These sensors are especially required for
higher speeds. The 2 poles resolver can be replaced by the 10 poles resolver by using the same resolver bracket. 10 poles
resolvers are more expensive than 2 poles resolvers.
For more information about suitable sensors, consult with the controller producer.
Every sensor has to be mounted on the motor by a special bracket. If the resolver / encoder is bought from the EMRAX Company
it is already precisely mounted on the motor by a special bracket when the customer receives the motor. Hall sensors are
mounted in the motor during the motor assembly.
!Note:
- Controllers can usually deliver very high peak power and lower continuous power, especially if the controller is air cooled.
- Performance of the motor also depends on the controller boost current and voltage (especially peak).
- Batteries should have very high C (Current) rating – very high boost discharging current from the batteries at high motor load.
- For EMRAX TWIN application two sensors (tandem resolver mounted on the second motor) and two controllers are needed.
Some controllers (rare controllers) have an option to split the signal from two controllers in only one sensor (usually encoder),
which is mounted on the second motor.
- Separated EMRAX motors which are not connected together mechanically (are not on the same shaft), cannot be driven with
one controller.
Motor RPM depends on battery DC voltage and magnetic field weakening:
Maximal battery DC voltage delivers maximal motor RPM which should not be exceeded. Take a look at specific load speed in the
Technical Data Table – RPM/1Vdc. In the case of using the magnetic field weakening option in the controller settings the
maximal motor RPM can be achieved even at lower DC voltage from the batteries.
Achieving higher RPM with magnetic field weakening (MFW):
Most controllers have an option to set the magnetic field weakening in the controller software program. This setting enables the
motor to achieve higher RPM at the same battery voltage. All EMRAX motors can weaken the magnetic field up to 100%. In this
case the rotation speed increases, but the power stays at the same level. Torque is lower at higher speed. Efficiency drops only
for 1-2 %.
To Next Page
Loading...
