Inductive Position Sensor IPS2550: Alternative to Resolver xEV, Best Choice for Position Sensors

【Introduction】In recent years, fuel-powered vehicles are gradually being replaced by electric vehicles due to the carbon neutrality strategies of various countries. At the COP26 meeting in the UK in November 2021, more than 20 member states agreed to achieve fuel-free vehicles by 2040. Therefore, no one can stop the arrival of the era of new energy vehicles. I believe that in the future, more and more people will enter the field of R&D and manufacturing of new energy vehicles.

Today I want to introduce a product that all xEV developers cannot refuse. That is the in-vehicle position sensor “Electromagnetic Induction Sensor IPS2550” that is indispensable in electric vehicles.

There’s only one reason to say no: cheap and easy to use.

Product introduction

First of all, I would like to introduce this product “Electromagnetic Induction Position Sensor IPS2550”.

The IPS2550 is based on the electromagnetic induction position detection technology of Renesas Electronics, which detects the position of the target metal according to the electromagnetic induction principle of the coil.

Inductive Position Sensor IPS2550: Alternative to Resolver xEV, Best Choice for Position Sensors

Q: Looking for a higher accuracy position sensor!

A: The IPS2550 is designed based on the motor shaft and can optimize the angular accuracy by matching the number of sectors in the sensor to the number of pole pairs in the motor. The IPS2550 can correspond to a maximum speed of up to 600,000rpm (electrical angle), and can achieve higher accuracy than other position sensors. The accuracy is about 2 to 3 times higher than that of general resolvers.

● High precision ≤0.1% full scale (ideal coil)

● The maximum corresponding speed is up to 600,000rpm (electrical angle)

Q: I want to build the most suitable position sensor!

A: Since the IPS2550 detects the position of the target metal according to the electromagnetic induction principle of the coil, it is not limited by the type and shape of the motor, and can flexibly respond to all mounting methods.

Inductive Position Sensor IPS2550: Alternative to Resolver xEV, Best Choice for Position Sensors

For the composition of the IPS2550 position sensor, please see the figure below, only metal fan blades, PCB and semiconductors are required. Mechanical products such as resolvers require considerable manufacturing experience and high-precision equipment to manufacture, which is undoubtedly a big problem for you to build your own position sensor. In comparison, the IPS2550 only needs a PCB, a metal fan blade and a chip, and does not require special manufacturing equipment, so you can easily manufacture your own IPS2550 position sensor.

Inductive Position Sensor IPS2550: Alternative to Resolver xEV, Best Choice for Position Sensors

For all xEV developers, we at Renesas will use our long-term experience to provide you with all-round technical support for coil design (from concept design to coil data). This includes system analysis and feasibility studies, coil design, optimization, and Gerber data for coils. We also provide various design example CRBs (Customer Reference Board Catalog) for xEV developers as a reference.

Q: Want to reduce the cost of position sensors!

A: When you use a traditional resolver as the position sensor of the xEV, you need to fix the resolver body to the motor, connect it to the motor shaft, and then use the connector to connect it to the control board, and you need to control the The excitation circuit is added on the board. When using IPS2550, you only need to configure it as shown in the figure below. Therefore, the cost of the BOM count of the IPS2550 can be reduced by 30% or more compared to the resolver.

Inductive Position Sensor IPS2550: Alternative to Resolver xEV, Best Choice for Position Sensors

Related Solutions

Next, I would like to introduce the “xEV inverter solution using IPS2550”.

In this solution, it not only has an xEV-oriented inverter with an output specification of 100kW and an amazing size of only 3.9L, but also uses IPS2550 for higher-precision angular position detection to achieve higher Low cost, it is easier to realize internalized design. At the same time, we also verified the noise immunity of the position sensor in the high-voltage inverter environment.

The semiconductors mainly used in inverters are Renesas’ own products, such as IPS255, microcontroller RH850/C1MA2, IGBT/FRD, optocoupler, etc. Renesas can not only provide semiconductors, but we can also provide a full range of technical support in the three areas of hardware system design and software system design.

The following is a system block diagram of the solution:

Inductive Position Sensor IPS2550: Alternative to Resolver xEV, Best Choice for Position Sensors

Ease of use of the system

We not only provide sample software for evaluation, but also provide the above coil design examples and support the coil design process to support customers in early market launch.

With this solution:

● Look for a higher accuracy position sensor

● Built-in the most suitable position sensor

● Cut the cost of position sensors

We want to help xEV developers with the above requirements to the greatest extent possible.

Source: Renesas Electronics, Original: Chen Guanyuan

The Links:   LM170E03-TLG1 LQ038Q7DR01

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